镁铝复合氢氧化物去除水体中铅离子的研究

Experimental Study on Removing Lead from Water with Mg-Al Complex Hydroxides

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p H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:p H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Al Cl3,实验溶液中Mg^2+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 attracted 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 p H,Al dosage,Mg2+concentration and Pb ion characterization.It is found that p H is the key factor affecting the removal of Pb ions by Mg-Al complex hydroxides.Al13with high degree of polymerization is a highly effective flocculant with removal effect better than Al Cl3.When the content of Mg^2+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.