采用液相沉积法制备了复合除磷吸附剂——镧铁活性炭纤维(LaFe-activated carbon fiber, LaFe-ACF), 讨论了铁镧摩尔比、金属离子总浓度单因素对制备材料的影响. 结果表明, 制备LaFe-ACF 的最佳铁镧摩尔比为3∶7,最佳金属离子溶液浓度为0.15 mol/L. 分别采用静态法和动态法考察了LaFe-ACF的吸附除磷性能. LaFe-ACF 的静态吸附结果表明, Langmuir吸附等温线能很好地描述吸附过程, 说明LaFe-ACF除磷是单分子层吸附过程, 且其最大吸附量计算值为29.44 mg/g.
Complex phosphate adsorbent, denoted as LaFe-activated carbon fiber (LaFe-ACF), was prepared from lanthanum, iron and activated carbon fiber using a liquid phase deposition method. Single factors such as Fe/La ratio and total concentration of metal ions were discussed. The results show that the best Fe/La ratio is 3∶7, and the best concentration of metal ion solution is 0.15 mol/L. The phosphorus removal performance of LaFe-ACF was investigated in static and dynamic adsorption experiments. The isothermal adsorption study of the LaFe-ACF showed that Langmuir isotherm fit the experimental data quite well, indicating that the adsorption process was mainly through single-molecule chemisorption on the surface, and the maximum adsorption capacity was 29.44 mg/g.
[1] Celen I, Buchanan J R, Bums R T, et al. Using achemical equilibrium model to predict amendments required to precipitate phosphorus as struvite in liquid swine manure [J]. Water Research, 2007, 41(8):1689-1696.
[2] Le C, Zha Y, Li Y, et al. Eutrophication of lake waters in China: cost, causes, and control [J]. Environ Manage, 2010, 45(4): 662-668.
[3] Doyle J D, Parsons S A. Struvite formation, control and recovery [J]. Water Research, 2002, 36(16):3925-3940.
[4] Boisvert J P, To T C, Berrak A, et al. Phosphate adsorption in flocculation processes of aluminium sulphate and poly-aluminium-silicate-sulphate [J].Water Research, 1997, 31(8): 1939-1946.
[5] Hsu P H. Comparison of iron (Ⅲ) and aluminum in precipitation of phosphate from solution [J]. Water Research, 1976, 10(10): 903-907.
[6] Angel R. Removal of phosphate from sewage as amorphous calcium phosphate [J]. Environmental Technology, 1999, 20(12): 709-720.
[7] Karathanasis A D, Potter G L, Coyne M S. Vegetation effects on fecal bacteria, BOD, and suspended solid removal in constructed wetlands treating domestic wastewater [J]. Ecological Engineering,2003, 20(2): 157-169.
[8] Huang X, Liao X P, Shi B. Adsorption removal of phosphate in industrial wastewater by using metalloaded skin split waste [J]. Journal of Hazardous Materials, 2009, 166: 1261-1265.
[9] 徐丰果, 罗建中, 凌定勋. 废水化学除磷的现状与进展[J]. 工业水处理, 2003, 23(5): 18-20.
[10] 丁文明, 黄霞. 水合氧化镧吸附除磷研究[J]. 环境科学,2003, 9(5): 63-68.
[11] 邓春玲. 稀土吸附剂废水深度脱磷[D]. 昆明: 昆明理工大学, 2002.
[12] Liu J Y, Zhou Q, Chen J H, et al. Phosphate adsorption on hydroxyl-iron-lanthanum doped activated carbon fiber [J]. Chemical Engineering Journal,2013, 215/216: 859-867.
[13] Yu C Z, Yang J, Zhou L A, et al. A designed nanoporous material for phosphate removal with high efficiency [J]. J Mater Chem, 2011, 21: 2489-2494.
