磁性生物氧化锰制备及对As(Ⅲ)的吸附效果研究

Preparation of magnetic biogenic Mn oxide and its adsorption on As(Ⅲ)

通过席夫碱反应制备了磁性生物氧化锰(MBMO),分析了磁性材料的物理化学特征,研究了pH、As(Ⅲ)浓度、共存阴离子、盐度、再生条件等因素对废水中砷(As(Ⅲ))吸附固定效果的影响。结果表明:制备的MBMO具有良好的磁响应性能,可实现MBMO的快速分离回收;MBMO对废水中As(Ⅲ)具有良好的吸附性能,当As(Ⅲ)初始浓度为0.2mg/L时,MBMO对As(Ⅲ)的去除率为95.86%;随着溶液初始pH的增加,As(Ⅲ)的去除率随之增加;当Cl-浓度为0.1~10mmol/L、盐度在0.2%~5%时,MBMO对As(Ⅲ)的去除率没有显著影响;共存PO43-和SiO32-离子会显著影响As的吸附效率,且随着浓度的增加去除率降低;0.1mol/L NaOH溶液能实现MBMO的再生,循环3次后As(Ⅲ)的去除率仍在80%以上。总体而言,MBMO是一种高效的As污染环境修复生物材料。

Magnetic biogenic Mn oxide(MBMO)was prepared by Schiff base reaction,and the physicochemical characteristics of the magnetic material were analyzed.The effects of pH,As(Ⅲ)concentration,coexisting anions,salinity,regeneration conditions and other factors on the adsorption and immobilization effect of arsenic(As(Ⅲ))in wastewater were investigated.The results showed that the prepared MBMO has good magnetic response performance,which can realize the rapid separation and recovery of MBMO;MBMO has good adsorption performance for As(Ⅲ)in wastewater,and the removal rate of As(Ⅲ)by MBMO was 95.86%when the initial concentration of As(Ⅲ)was 0.2 mg/L;with the increase of the initial pH of the solution,the As(Ⅲ)removal efficiency increased;when the chloride ion concentration was 0.1-10 mmol/L and the salinity was 0.2%-5%,there was no significant effect on the removal rate of As(Ⅲ)by MBMO;the co-existing P O 3-4 and Si O 2-3 ions significantly affected the adsorption efficiency of As and the removal rate decreased with the increase of the concentration;the regeneration of MBMO could be realized by the 0.1 mol/L NaOH solution,and the removal rate of As(Ⅲ)was still above 80%after 3 times of the cycle.Overall,MBMO is an efficient biomaterial for the remediation of As contaminated environment.