收稿日期: 2018-05-17
网络出版日期: 2021-07-22
基金资助
国家自然科学基金资助项目(21207085);上海市教委科研创新基金资助项目(14YZ014)
Preparation, phosphorus removal performance and mechanism of lanthanum oxide/expanded graphite composite adsorbents
Received date: 2018-05-17
Online published: 2021-07-22
为了获得除磷性能更优的吸附剂, 以负载 LaOH 的膨胀石墨(expanded graphite-LaOH, EG-LaOH)为前驱体, 分别于 340, 500 和 750 ${^\circ}$C 下焙烧制备了镧氧化物/膨胀石墨复合吸附剂 EG-LaO-340, EG-LaO-500 和 EG-LaO-750. 通过吸附动力学和等温线实验, 考察了 EG-LaO-340, EG-LaO-500 和 EG-LaO-750 的除磷性能. 结果发现, 制备温度不同对吸附剂的除磷性能影响明显, 其中 EG-LaO-340 的吸附速率和吸附容量均为最优. 通过研究热力学参数和溶液初始 pH 对吸附容量的影响, 以及扫描电镜(scanning electron microscope, SEM)和傅里叶变换红外(Fouier transform infrared, FTIR)光谱的分析进一步探讨了 EG-LaO-340 的除磷机理. 结果表明: 该吸附是一个能够自发进行的吸热过程; 吸附除磷主要通过静电作用、离子交换作用和路易斯酸碱作用实现.
靳苏皖, 牛维亚, 张玲, 毛纤勇 . 镧氧化物/膨胀石墨复合吸附剂的制备、除磷性能及机理[J]. 上海大学学报(自然科学版), 2021 , 27(4) : 686 -695 . DOI: 10.12066/j.issn.1007-2861.2176
To obtain a highly efficient phosphate removal adsorbent, lanthanum oxide/expanded graphite composite adsorbents were prepared from LaOH load-expanded graphite (EG-LaOH) at 340, 500 and 750 $^\circ$C, namely EG-LaO-340, EG-LaO-500 and EG-LaO-750, respectively. The phosphate removal performances of EG-LaO-340, EG-LaO-500 and EG-LaO-750 were investigated using adsorption kinetics and isotherm experiments. The dephosphorization of the adsorbents was found to be distinctly affected by the preparation temperature, with EG-LaO-340 having the optimal adsorption rate and adsorption capacity. The phosphorus removal mechanism of EG-LaO-340 was investigated by studying its thermodynamics and the pH dependence of adsorption. Additionally, scanning electron microscope (SEM) and Fourier transform infrared (FTIR) spectroscopy were used to characterise the adsorbents. Adsorption was found to be an endothermic and spontaneous process. Electrostatic and Lewis acid-base interactions, in addition to ion exchange, were found to be the main mechanisms of phosphate adsorption.
Key words： phosphorus removal; lanthanum oxide; expanded graphite (EG); adsorption; mechanism
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