镁铝复合氢氧化物去除水体中铅离子的研究

摘要

近些年,铅污染已成为威胁人类健康的十大类污染物之一,越来越引起公众的关注,本文主要通过pH影响实验、Al投加量实验、Mg2+浓度影响实验及Pb离子表征实验,研究镁铝复合氢氧化物对于水体中铅的去除情况.研究发现:pH是镁铝复合氢氧化物去除Pb离子的关键影响因素,聚合度较高的Al13是一种高效絮凝剂,在去除效果上Al13优于AlCl3 ,实验溶液中Mg2+含量为24. 0 mg/L时,达到较好的去除Pb离子效果,镁铝复合沉淀物呈无定形形态,有较大的比表面积,结晶度较好,使去除重金属离子的效率得到进一步提高.%In recent years, lead pollution has become one of the ten major pollutants threatening human health, which has at-tracted more and more public attention. This paper mainly studies the effect of Mg-Al complex hydroxides in removing lead from water through several experiments of pH, Al dosage, Mg2+ concentration and Pb ion characterization. It is found that pH is the key factor affecting the removal of Pb ions by Mg-Al complex hydroxides. Al13 with high degree of polymerization is a highly ef-fective flocculant with removal effect better than AlCl3 . When the content of Mg2+ in the experimental solution is 24. 0 mg/L, it can achieve a better removal effect of Pb ions. The Mg-Al composite precipitates have amorphous morphology, larger specific surface area and better crystallinity, which further improve the removal efficiency of heavy metal ions.