镁铝复合氢氧化物对于水体中砷的去除研究  

Removel researching on arsenic of water by formation compound Mg-Al hydroxides

作　　者：张欢[1] 程继夏[2] 赵赟鑫 

机构地区：[1]汉中市环境监测中心站,陕西723000 [2]长安大学环境科学与工程学院,陕西710054

出　　处：《环境与发展》2011年第10期121-123,共3页Environment & Development

摘　　要：砷污染己经是全球性污染问题,受到了各界普遍关注。砷具有强毒性,且可致癌;若含As离子的废水不经处理,排入自然水体,会严重污染生态环境,危害人体健康。镁铝复合氢氧化物是在强化混凝过程中形成的,并且高聚合度的铝系混凝剂有利于形成更多的镁铝复合物;本次研究主要利用这种材料,研究其对于As离子的去除效果,以及去除后的表征情况,可以得出如下结论:pH、As离子浓度是较关键的影响因素,这些因素均影响着镁铝复合氢氧化物的形成情况以及其对于离子的去除效果。通过一些表征说明,镁铝复合物的形态呈无定形,具有巨大的比表面积,成分也较为复杂;在一定pH保证下,聚合度较高的Al13较AlCl3形成复合物的颗粒要大,说明形成的镁铝复合氢氧化物对于污染离子的去除起到了更加积极的促进作用。Arsenic and heavy metal pollution has been a global pollution problem,and has caused wide public concern.Arsenic has strong toxicity,and it is carcinogenic.If the untreated waste water which contained those arsenic ions discharged into natural water bodies will heavily pollute the environment and also harm the human health.The compound Mg-Al hydroxides can be formed in the process of coagulation,and high degree of polymerization of aluminum based coagulants are conducive to form more compound Mg-Al.In this researching,we mainly use this material to study its effectiveness on removing As ions,and the characterization removed,the author draws a conclusion as below: pH and concentration of different arsenic ions is the most crucial factor,which not only determines whether it can form compound Mg-Al and its structure,but also shows that under the proper pH,compound Mg-Al hydroxides has the strongest ability to remove As.According to some characteristics,it shows that the form of Mg-Al composite was amorphous,with a huge surface area,and the composition is relatively complex.Under a certain range of pH,the higher polymerization degree's Al13 can form lager composite particles than AlCl3 does,and it illustrates the compound Mg-Al hydroxides do have more positive facilitation on removing polluted ions.

关 键 词：镁铝复合氢氧化物 AS PH 

分 类 号：TU9[建筑科学]