【摘要】 采用微波辅助制备锆铝柱撑膨润土(MAZPB)作为吸附剂,研究其对水中F的去除性能,探讨了MAZPB投加量、溶液pH值、水中共存离子、再生能力等对氟吸附的影响.结果表明,在较宽的pH范围(3.5～10)内,MAZPB有较好的除氟效果,去除率均达89%以上.高浓度的Fe3+及CO32-共存能明显抑制MAZPB对氟的吸附.该吸附过程遵循Lagergren拟二级反应动力学.MAZPB吸附F符合Freundlich吸附等温模型.在实验条件下的吸附体系中,吸附机制主要为物理吸附.采用明矾对吸附F饱和的MAZPB进行再生后,其对F的去除率仍达81.93%.更多还原

【Abstract】 Microwave-aided synthesized Al-Zr pillared bentonite (MAZPB) was applied to remove fluoride from aqueous solution.MAZPB was characterized by SEM and XRD.The influences of pH value,adsorbent dose and presence of other anions on fluoride adsorption on MAZPB were investigated.The results showed that MAZPB efficiently adsorbed F- in a wide pH range (3.5 10),and its removal rate remained above 89%.The presence of other ions such as ferric ion and carbonate affected the adsorption of fluoride significantly,indicating the selective nature of the adsorbent.The kinetic parameters of the adsorption showed that the adsorption kinetics followed a pseudo-second-order model.The Freundlich model yielded a much better fitting than the Langmuir model,indicating that the physical adsorption was predominant.Used MAZPB could be regenerated by alum,and the removal rate of fluoride reached 81.93%.更多还原