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Published in last 1 year |  In last 2 years |  In last 3 years |  All Please wait a minute... For Selected: Download Citations EndNote Ris BibTeX Toggle Thumbnails Select Applications of ϕ-mapping theory in describing Weyl topological semimetals HUANG Xiaohong, JIANG Ying Journal of Shanghai University（Natural Science Edition）    2024, 30 (1): 106-117.   DOI: 10.12066/j.issn.1007-2861.2392 Abstract （5430）      PDF（pc） （1240KB）（44）       Knowledge map    Save In this study, we examine the topological classification of Weyl semimetals of Hermitian and non-Hermitian systems using ϕ-mapping topological current theory. We establish the ϕ fields in the momentum space by the given Hamiltonians of two-band systems to define the topological charge density. We find that the topological charge density is nonzero only at the zeroes of the norm of the ϕ fields, and these zeroes are exactly where Weyl points or Weyl exceptional points are located. The quantized numbers obtained by integrating the topological charge density can be used as the topological numbers for topo- logical classification. Related Articles | Metrics | Comments（0） Select Development and application of hardening soil model with small strain stiffness in FLAC3D TANG Daofei, WANG Changhong Journal of Shanghai University（Natural Science Edition）    2023, 29 (3): 549-.   DOI: 10.12066/j.issn.1007-2861.2277 Abstract （1056）      PDF（pc） （14139KB）（91）       Knowledge map    Save A constitutive model of hardening soil and small-strain-hardening soil was established to simulate the loading–unloading characteristics accurately. Mathematical equations for the constitutive models of the hardening and small-strain-hardening soils were de-rived using the yield function, plastic potential function, and flow law. Dynamic-link data were compiled using the VC++ language, and the loading and invoked interfaces were modelled using FLAC3D 3.0. Test results for classical cases of small-strain model development were compared to verify the rationality of the hardening soil model with small-strain stiff-ness. The constitutive model was used to simulate the deep foundation excavation of the Oasis Center in Shanghai, and the actual measurement results were compared with those of the small-strain-hardening soil, hardening soil, and Mohr–Coulomb ideal elastic–plastic models. The analysed data of the hardening and small-strain-hardening soil models were in good agreement with the measurements. This study provides a reliable constitutive model of deformation control for large-scale geotechnical projects. Related Articles | Metrics | Comments（0） Select Adaptive reactionless trajectory tracking control method for postcapture of noncooperative target YANG Yi, WANG Shun, XU Jia, ZHENG Huayong, ZHAO Yongjian, YANG Yang Journal of Shanghai University（Natural Science Edition）    2023, 29 (3): 460-.   DOI: 10.12066/j.issn.1007-2861.2286 Abstract （751）      PDF（pc） （787KB）（55）       Knowledge map    Save The stable control of space robots after capturing noncooperative targets with unknown dynamic characteristics is challenging. Based on the adaptive reaction null space (ARNS) algorithm, the dynamic online planning path of a robotic arm was investigated to minimise the disturbance to the base. Using a variable data-window-size recursive least-square algorithm (VDW-RLS), the system could achieve an online estimation of the inertial parameters of the end link. In addition, a high-precision trajectory tracking control method was developed using the singular perturbation theory. According to the time scale, the system was decomposed into two subsystems. An elastic vibration compensator was designed for the rapid subsystem to suppress elastic vibration, and a robust adaptive controller was designed for the slow subsystem to track the adaptive reactionless trajectory. The validity of the adaptive reactionless path planning scheme via VDW-RLS and combined controller based on the singular perturbation technique were verified through simulation experiments. Related Articles | Metrics | Comments（0） Select Model test of reinforced roadbeds by geogrid subgrade underlying sinkholes based on FBG-3D printing YANG Jie, ZHANG Meng-xi, QIU Cheng-chun Journal of Shanghai University（Natural Science Edition）    2023, 29 (3): 525-.   DOI: 10.12066/j.issn.1007-2861.2302 Abstract （640）      PDF（pc） （2582KB）（86）       Knowledge map    Save Fiber Bragg grating (FBG) sensing technology has the advantages of high sensitivity, anti-electromagnetic interference and real-time monitoring and has thus attracted increasing attention in the field of civil engineering. However, fully coordinated deformation between the sensor and measured object is difficult to achieve using the traditional external packaging method, and measurement errors are common. Based on 3D printing technology, a type of self-sensing geogrid is developed in this study which realizes fully coordinated deformation between the FBG sensor and tested geogrid. This enables using FBG technology to realize real-time and accurate measurements of geogrid strain directly. The self-sensing geogrid is applied to a model test of an underlying sinkhole roadbed to study the roadbed’s ultimate bearing capacity, top settlement and deformation characteristics under different reinforced layers and spacings. Test results show that the ultimate bearing capacity of the subgrade of the underlying sinkhole can be greatly increased by reinforcement, and the subgrade settlement can be effectively reduced. In addition, the bearing capacity of the subgrade can be increased with an increase in the number of reinforcement layers and a decrease in reinforcement spacing. In the vertical direction, the strain of the grid decreases with an increase in the buried depth of the grid; in the horizontal direction, the strain of the grid decreases to both sides with an increase in the distance from the loading centre. The strain of the top grid decreases with an increase in the number of reinforcement layers and increases with a decrease in reinforcement spacing. Experimental results verify the feasibility of the application of the self-sensing geogrid in monitoring reinforced roadbeds in underlying sinkholes. Related Articles | Metrics | Comments（0） Select Section design and seismic performance of self-resetting shear wall with variable slit length WU Yiwen, ZHU Jiejiang Journal of Shanghai University（Natural Science Edition）    2023, 29 (3): 512-.   DOI: 10.12066/j.issn.1007-2861.2299 Abstract （614）      PDF（pc） （4976KB）（75）       Knowledge map    Save The research aims to study the seismic performance of shear wall with different slotted lengths. Stress analysis of cross sections of shear wall were carried out to quantify the theoretical bearing capacity of the wall under different slotted lengths, and based on the performance goals in fourth level and under third level, cross section of self-reset wall was designed and compared with existing experimental results as well as static elastoplastic results of self-resetting shear wall with variable slit lengths for validation. The results show that the theoretical expression of the bearing capacity agrees with existing experimental and finite element results. Moreover, with an increase in crack length, the self-repositioning ability of the wall increases, and the energy dissipation capacity decreases. A slit length coefficient of 0.2–0.3 adheres to the limit of residual displacement angle and maintains a satisfactory energy dissipation capacity. Related Articles | Metrics | Comments（0） Select Multilayer-mesh lattice Boltzmann method with single layer buffer YANG Zitao, WANG Liangjun, ZHU Wenhao, DING Hu, ZHANG Wu Journal of Shanghai University（Natural Science Edition）    2023, 29 (3): 473-.   DOI: 10.12066/j.issn.1007-2861.2303 Abstract （541）      PDF（pc） （10034KB）（107）       Knowledge map    Save Based on the multilayer-mesh lattice Boltzmann method (LBM), an information transfer optimization algorithm using a single-layer buffer without time interpolation is developed in this study. The algorithm uses a quadtree structure to construct the parent–child relationship between lattice points at different neighboring levels of mesh, simplifies the transformation of distribution function on the interface of coarse and fine meshes, and fully exploits the locality and parallelism of LBM. A general parallel program of the multilayer-mesh LBM is developed to simulate lid-driven cavity flow, point sound source diffusion, and flow around an NACA0012 airfoil. Numerical results show that the developed algorithm and program are very effective and exhibit excellent speedup, efficiency, and scalability. Compared with the standard LBM, the multilayer-mesh LBM with a single-layer buffer has obvious advantages in terms of computational stability, convergence speed, and computational efficiency. Related Articles | Metrics | Comments（0） Select ANALYTIC SOLUTION OF BENDING DEFORMATION OF COMPOSITE BEAMS WITH INTERFACIAL SLIP AND LIFT YANG Xiao, WANG Huan Journal of Shanghai University（Natural Science Edition）    2023, 29 (4): 705-719.   DOI: 10.12066/j.issn.1007-2861.2309 Abstract （513）      PDF（pc） （489KB）（102）       Knowledge map    Save In order to consider effects of longitudinal slip and vertical uplift of composite beam connection surface, the governing equations of composite beam bending deformation are established with fundamental unknowns of the longitudinal slip and vertical deflections of sub beams under assumption of sub-beams satisfying Euler-Bernoulli bending theory. By using Laplace transform and its inverse Laplace transform, the analytical solutions of deflection, slip displacement, axial force and bending moment of simply-supported composite beam under uniform load are obtained. Assuming that the material and geometric parameters of the two sub-beams are the same, the effects of the loading mode and the longitudinal slip and vertical uplift stiffnesses of the connection surface on the bending deformation and internal forces of the simply supported composite beam are analyzed. The results show that with the increase of interface longitudinal stiffness, the deflection, slip displacement and bending moment of composite beams decrease first and then tend to be constant, while the axial force of composite beams increases first and then remains constant; And when the composite beam is loaded from the top sub-beam, with the increase of the vertical stiffness of the interface, the deflection and bending moment of the upper beam first decrease and then tend to be constant, while the deflection and bending moment of the lower beam first increase and then tend to be constant; When the composite beam is loaded at the bottom sub-beam, it is opposite to that at the top; The deformation and internal force of composite beams have nothing to do with the vertical stiffness when the upper and lower loads are the same. Related Articles | Metrics | Comments（0） Select Global warming research based on quantile regression model and empirical mode decomposition XIAO Jie, AI Min, NI Zhongxin Journal of Shanghai University（Natural Science Edition）    2024, 30 (1): 152-163.   DOI: 10.12066/j.issn.1007-2861.2293 Abstract （495）      PDF（pc） （9140KB）（31）       Knowledge map    Save The purpose of this study is to analyze climate’s variation trend and forecast the climate. The main methods are known as quantile regression and empirical mode de- composition (EMD). Firstly, a global heat map is utilized for the descriptive statistics of global temperature data. The EMD method is applied for data denoising to analyze global temperature’s variation trend, and the concept of global temperature cycle is introduced. These aim to study the trend of global warming. Secondly, the multivariate linear regres- sion model and the quantile regression model are applied to identify factors influencing global temperature. Then the temperature model is built to predict temperature changes. The findings can provide statistical support for global climate analysis. Related Articles | Metrics | Comments（0） Select Preparation of silver nanowires and their flexible transparent conductive films Liu Xiaowen, Qian Fei, Zhang Bo, Wu Meiying, Li Hongbin, Zhang Baohua Journal of Shanghai University（Natural Science Edition）    2023, 29 (6): 1022-1029.   DOI: 10.12066/j.issn.1007-2861.2304 Abstract （489）      PDF（pc） （4622KB）（146）       Knowledge map    Save Silver nanowires with a diameter of approximately 40 nm and a length to diameter ratio of approximately 300 were prepared via the polyol method. Subsequently, uniform, stable, and flexible transparent conductive films of silver nanowires were prepared by the spin coating method. Polyethylene terephthalateco-1,4-cylclohexylenedimethylene terephthalate (PETG) film was used as the substrate and Chitosan or Xanthan gum as the auxiliary film forming agent. It was found that the deposition density of silver nanowires dispersion had an significant effect on the transparency and electrical conductivity of silver nanowires flexible transparent conductive films. The light transmittance and electrical conductivity of the films reached a maximum when the deposition density was 10 mg/cm2 . The bending performance test of the film indicated good flexibility. Related Articles | Metrics | Comments（0） Select Research progress on electrolyte additives for aqueous zinc ion batteries  JIN Mingzhe, WANG Chen, WANG Tan, FU Jing Journal of Shanghai University（Natural Science Edition）    2023, 29 (5): 900-914.   DOI: 10.12066/j.issn.1007-2861.2518 Abstract （445）      PDF（pc） （6408KB）（667）       Knowledge map    Save Aqueous Zn ion batteries are regarded as one of the most promising newgeneration electrochemical energy storage devices with a high specific capacity, high safety, and economic benefits. However, the direct utilization of Zn foils as metallic anodes is constrained by the problems of notorious Zn dendrite growth and severe corrosion. Recently, researchers have focused on inhibiting dendrite growth and reducing side reactions through electrolyte additives to obtain high-performance aqueous Zn ion batteries. Hence, this review first presents a general overview of aqueous Zn ion batteries and then systematically summarizes the mechanism of inhibition of dendrite growth and side reactions by electrolyte additives. Finally, suggestions for further development of electrolyte additive strategies in aqueous Zn ion batteries are presented.  Related Articles | Metrics | Comments（0） Select Research on Optimization of the Location of Precast components in Prefabricated Shear Wall Structures LI Jiazhe, ZHU Jiejiang Journal of Shanghai University（Natural Science Edition）    2023, 29 (4): 720-733.   DOI: 10.12066/j.issn.1007-2861.2313 Abstract （442）      PDF（pc） （472KB）（63）       Knowledge map    Save The optimization of the location of precast components is an important method of cost control in the optimal design of prefabricated shear wall structures. With the selection of precast components determined, the location of precast wall-beam combined components is optimized by combining immune genetic algorithm, the minimum precast component volume is the objective function, the structural torsional displacement ratio and story drifts are the constraints. The optimization results of the algorithm show that the optimized location of the precast components combined with the immune genetic algorithm can satisfy the structural constraints, the volume of the precast components is smaller and the optimization is more economical. Related Articles | Metrics | Comments（0） Select Method for the synthesis of megastigmatrien-3-one using a novel starting material SHEN Jie, LIANG Demin, SHA Yunfei, LI Jian Journal of Shanghai University（Natural Science Edition）    2023, 29 (3): 562-.   DOI: 10.12066/j.issn.1007-2861.2360 Abstract （437）      PDF（pc） （306KB）（142）       Knowledge map    Save Megastigmatrien-3-one is considered to be the most essential aroma constituent of tobacco and is widely applied in flavorings and perfumes as well as in the tobacco indus-try. This manuscript describes a new synthetic strategy for megastigmatrien-3-one synthe-sis using readily-available ethyl 2,6,6-trimethyl-4-oxocyclohex-2-ene-1-carboxylate as the starting material, which is then subjected to ketal protection and reduction with lithium aluminum hydride to produce the alcohol intermediate. The alcohol intermediate sub-sequently undergoes Swern oxidation, Grignard, and elimination reactions to afford the megastigmatrien-3-one with 40% total yield. This method features readily-available start-ing materials and mild reaction conditions, thereby exhibiting potential for further appli-cations. Related Articles | Metrics | Comments（0） Select Effects of applying livestock manure and mushroom residues on heavy metal accumulation in crops Jin Zhi, Hu Xuefeng, Lan Wenchong, Li Mei, Zhang Weijie Journal of Shanghai University（Natural Science Edition）    2023, 29 (4): 628-638.   DOI: 10.12066/j.issn.1007-2861.2296 Abstract （413）      PDF（pc） （428KB）（129）       Knowledge map    Save The effects of applying the culturing residues of Agaricus bisporus and Flammulina velutipes, pig manure and cattle manure on the growth of and heavy metal accumulation in the crops were studied through two field experiments. The content of heavy metals such as Cu and Zn in pig manure was significantly higher than that of the mushroom residues and cow manure. The content of Cu, Zn, Pb and Cd in Agaricus bisporus residue was significantly higher than that of Flammulina velutipes residue, which was related to the addition of a small amount of chicken manure to the culture base of Agaricus bisporus. The applications of the mushroom residues and manures have significant effects on yield increase. The yield of green pepper in the pig manure treatment was significantly higher than the other fertilization treatments. In pig manure treatment, the heavy metals of Cu, Pb, and Cd in crops are mainly concentrated in the roots; the content of Zn, Pb, and Cd in green pepper fruits increased significantly; the content of Cu, Zn, Pb, and Cd in rice increased significantly. However, the heavy metal content of green pepper and rice are within the safe range of food. The treatment of Agaricus bisporus residue significantly increased Cd in the roots of green peppers and increased Pb content in the fruits. In the treatment of Agaricus bisporus residue in a double amount, heavy metals are mainly concentrated in the roots of rice; the content of Pb and Cd in rice also increased significantly. The long-term application of pig manure and Agaricus bisporus residue will cause heavy metal accumulation risks in the soil and crops, which should be paid high attention to. In contrast, the application of Flammulina velutipes residue and cow manure has a lower risk of heavy metal accumulation in soil and crops Related Articles | Metrics | Comments（0） Select Syntheses and Photochromic properties of 4-fluoroacetophenone disubstituted viologen ZHANG Haotian, BAI YueLing, HANG Xiangcao, AN BaoLi, XU Jiaqiang Journal of Shanghai University（Natural Science Edition）    2024, 30 (1): 68-076.   DOI: 10.12066/j.issn.1007-2861.2301 Abstract （384）      PDF（pc） （4177KB）（35）       Knowledge map    Save Owing to their sensitive chromic behaviour under external stimulation, such as light, heat, and electricity, viologen-based materials have shown considerable potential in optical switching and molecular sensor recognition applications. 4-Fluoroacetophenone disubstituted viologen (VioF2·2Cl) was synthesised via a one-step reaction. The introduction of fluoroacetophenone substituents expands the conjugated system of the molecule which stabilises the radical structure and facilitates retention of the colour change for a longer period of time. The synthesized VioF2·2Cl exhibited sensitive photochromic properties, showing a rapid colour change from white to light yellow and then to yellow-green under ultraviolet (UV) light irradiation. Analysis of the crystal structure confirmed that the VioF2+ 2 molecules possess a shorter π · · · π∗ interaction distance after discoloration, which induces photoinduced electron transfer (PET) and thus stabilizes the viologen radical. VioF2·2Cl crystals can maintain their coloured radical state in an oxygen environment for three days without significant fading. This novel viologen derivative exhibits better sen- sitive photochromic properties and free radical colour stability essential for its application in the field of photochromic materials. Related Articles | Metrics | Comments（0） Select Application advances of ionic liquids in hydrometallurgical leaching and electrodeposition  WANG Fuqian, LU Minghui, WANG Shujuan, WANG Fei, XIA Xuewen, GENG Shuhua, ZOU Xingli, LU Xionggang Journal of Shanghai University（Natural Science Edition）    2023, 29 (4): 569-589.   DOI: 10.12066/j.issn.1007-2861.2506 Abstract （384）      PDF（pc） （10199KB）（421）       Knowledge map    Save Because of their excellent physical and chemical properties, namely, their good solubility, high conductivity, wide electrochemical window, good thermal and chemical stability, reusability, and easy regeneration, ionic liquids have been widely used in many fields such as organic synthesis, separation, electrochemistry, catalysis, metallurgy, nuclear energy recycling, and nanomaterials. In particular, the introduction of ionic liquids enables metallurgical reactions to occur at low temperatures, which in turn reduces energy consumption and pollution. Therefore, this new “green” solvent has great application potential in the field of metallurgy. This paper summarizes the research and application status of ionic liquids in hydrometallurgy, with a focus on the dissolution of metals and their oxides, the leaching of complex minerals and electronic wastes, and the preparation of various metals and their alloys by electrodeposition with ionic liquids as the medium. The developmental prospects of ionic liquids in metallurgy are also discussed. Related Articles | Metrics | Comments（0） Select Application and research progress of solid oxide fuel cell in transportation  QIN Xiangfu, CAO Junwen, ZHANG Wenqiang, YU Bo Journal of Shanghai University（Natural Science Edition）    2023, 29 (5): 803-818.   DOI: 10.12066/j.issn.1007-2861.2501 Abstract （309）      PDF（pc） （5409KB）（397）       Knowledge map    Save Solid oxide fuel cell (SOFC) is an energy conversion technology that can directly transform chemical energy into electric energy. It possesses characteristics of high efficiency, flexible fuel choice, and strong impurity tolerance. In recent years, there has been increased research focus on the application of SOFC in transportation. This study starts from the working principle of SOFC, analyses the application advantages of SOFC in transportation, and introduces the forms of application of SOFC in transportation, including as an auxiliary power unit and powertrain. The calculated efficiency of well-to-wheel (WTW) as a power system is 34%—39%, which is much higher than that of internal combustion engines (14%—17%) and batteries (27%), demonstrating the potential of SOFC as a powertrain in transportation. Then, the research progress of the SOFC power system is presented,  ncluding principle verification, energy efficiency improvement, and research on the powertrain performance. Finally, the current application status of SOFC in transportation is summarized, and its application prospects are discussed. SOFC holds substantial potential for application in transportation and can contribute to its decarbonization. Related Articles | Metrics | Comments（0） Select Enhanced denitrification effect of biological rope by composite solid-phase carbon source materials Li Ziru, Wang Feifei, Pan Jiazheng, Hu Yulin, He Chiquan, Huang Xin Journal of Shanghai University（Natural Science Edition）    2024, 30 (1): 77-085.   DOI: 10.12066/j.issn.1007-2861.2337 Abstract （306）      PDF（pc） （2697KB）（225）       Knowledge map    Save There are few organic carbon sources in micro-polluted water with excessive total nitrogen. Adding an external carbon source can promote denitrification to remove nitrogen. Solid carbon sources have attracted attention because they overcome the shortcomings of the traditional carbon source. In this study, two solid carbon sources, PSPC-Ⅰ and PSPC-Ⅱ, were prepared by cross-linking, using agricultural waste corncob and polymer materials as carbon sources and polyvinyl alcohol and sodium alginate as skeleton carriers. The carbon release characteristics of the two solid carbon sources and their enhanced denitrification effect were studied. The results showed that the two solid carbon sources released carbon continuously and did not reach carbon release equilibrium within 28 days. The maximum carbon release values of PSPC-Ⅰ and PSPC-Ⅱ were 6.3 and 8.7 mg/g (calculated via the dissolved organic carbon (DOC)), respectively. Three-dimensional fluorescence results showed that the released carbon sources were mainly soluble microbial metabolites and aromatic proteins that were easily degraded by microorganisms. In comparison with the biological rope without an added carbon source (6 200 ng/g, calculated via the adenosine triphosphate (ATP)), both solid carbon sources significantly increased the biomass of biological rope biofilm (PSPC-Ⅰ: 400∼600 ng/g, PSPC-Ⅱ: 300∼500 ng/g). Additionally, both solid carbon sources significantly enhanced denitrification. The control group did not produce denitrification, but the denitrification rates of the two solid carbon sources were as high as 80.4% and 75.0%, respectively. Related Articles | Metrics | Comments（0） Select Research progress in the design of electrocatalytic urea oxidation reaction catalysts ZHENG Siyu, CAO Xuejie, JIAO Lifang Journal of Shanghai University（Natural Science Edition）    2023, 29 (5): 886-899.   DOI: 10.12066/j.issn.1007-2861.2536 Abstract （299）      PDF（pc） （6212KB）（623）       Knowledge map    Save Electrocatalytic urea oxidation reaction (UOR) is the basic reaction involved in urea-assisted hydrogen production from electrolytic water, hydro-chemical degradation of urea-containing waste water, and direct urea fuel cell. However, because UOR involves a six-electron transfer process, it has slow kinetics, and thus has limited practical applications. Efficient and low-cost electrocatalysts must be developed to promote the UOR reaction process. To this end, many synthesis strategies have been reported in recent years, and great progress has been made in terms of catalyst design and elucidation of mechanism. In this paper, we discussed the details of UOR, along with various control game theories, such as doping engineering, heterostructure construction, defect engineering, alloys, and key reaction intermediates. We also summarized the research progress on UOR catalysts and discussed the challenges and prospects associated with the future development of ureabased energy conversion technology and the corresponding catalysts.  Related Articles | Metrics | Comments（0） Select The Optimal Selection of Remediation Plants for Cd Contaminated River Sediment SHEN Jiayi, ZANG Xueke, ZHANG Changsong, GAO Bingjie, GAO Mingjing, LI Xinyi, ZHANG Xinying Journal of Shanghai University（Natural Science Edition）    2024, 30 (1): 86-093.   DOI: 10.12066/j.issn.1007-2861.2336 Abstract （280）      PDF（pc） （398KB）（78）       Knowledge map    Save Twelve plants were selected to conduct an experimental study on remediation of Cd contaminated sediment of black-odor river in Shanghai. Tolerance, enrichment and translocation features, and remediation efficiencies of plants to the heavy metal were investigated, with a view to find practical application of phytoremediation of river sediments polluted by Cd. Results revealed that all the plants except the transplanted Juncus effusus L. showed good tolerance to the sediment. The above-ground Cd contents of Solanum nigrum L., Juncus effusus L., Calendula officinalis L., Hylotelephium erythrostictum (Miq.) H. Ohba, and Farfugrium japonicum (L. f.) Kitam. were higher than 4.50 mg/kg. The bioaccumulation factors (BCFs) and translocation factors (TFs) of Cd in Abutilon theophrasti Medicus, Juncus effusus L., Calendula officinalis L., Hylotelephium erythrostictum (Miq.) H. Ohba, Farfugrium japonicum (L. f.) Kitam. and Phytolacca americana L. were greater than 1. The extraction amounts of Cd in Solanum nigrum L., Calendula officinalis L., Phytolacca americana L. and Bidens pilosa L. were higher than 0.30 kg/hm2, and had relatively good remediation effects. Among the plants, the extraction amount and extraction efficiency of Solanum nigrum L. for Cd in the sediment were up to 2.84 kg/hm2 and 88.75%, respectively, indicating great remediation potential. The optimization test proved that Solanum nigrum L., as the best remediation plant, could be used to remediate the Cd contaminated river sediment in this area. Related Articles | Metrics | Comments（0） Select Preparation and photocatalytic performance of Co3O4/SnO2 derived from metal organic framework WU Hanhong, LIU Shanxin, Wang Dawei, HUANG Ruting, CHEN Zhiwen Journal of Shanghai University（Natural Science Edition）    2024, 30 (1): 54-067.   DOI: 10.12066/j.issn.1007-2861.2330 Abstract （274）      PDF（pc） （3057KB）（122）       Knowledge map    Save A cubic  Co3O4/SnO2 composite photocatalyst was prepared by combining do-decahedral nano-blocks derived from metal-organic framework (MOF) material ZIF-67 with SnO2 at room temperature. Results showed that the band gap of the calcined  Co3O4/SnO2 material was significantly reduced, and the phenomenon of fluorescence quenching was obvious. The addition of Co3O4 expanded the photoresponse range of SnO2 to visible light or even infrared light and simultaneously promoted the separation of photo-generated carriers during the photocatalytic reaction. With Rhodamine B (RhB) used as the target reactant, the photocatalytic degradation activity of  Co3O4/SnO2 derived from the MOF was investigated under visible light. It was found that  Co3O4/SnO2 could degrade 89.6%RhB within 60 min, which was 4.5 and 3 times greater than those of pure SnO2 and pure ZIF-67, respectively. In addition, Co3O4/SnO2 showed good photoreactivity and stability. Based on these experimental results and those from free-radical quenching experiments, the mechanism of photocatalytic degradation of organic dyes RhB by the MOF-derived Co3O4/SnO2 composite material was proposed. Related Articles | Metrics | Comments（0）