Zn2+和HCO3-对纳米磁性铁去除水中砷的影响

摘要

研究Zn2+和HCO3-对纳米磁性铁去除水中砷的影响.结果表明:Zn2+可以显著增强纳米磁性铁对砷的吸附,使As(Ⅴ)去除率由原来的66％提高到99％以上；HCO3-对纳米磁性铁吸附砷具有明显的抑制作用,使As(Ⅴ)去除率降至15％；而Zn2+可以削弱HCO3-对As(Ⅴ)吸附的抑制效应,在较短时间内(2 h)去除90％以上的As(Ⅴ),达到世界卫生组织规定的饮用水砷标准10 μg/L.%The effects of Zn2+ and HCOf on arsenic adsorption by magnetite nanoparticles were investigated. The results show that in the presence of Zn2+, the As( V) adsorption on magnetite nanoparticles is significantly enhanced and the arsenic removal rate is increased from 66% to over 99%; and the arsenic (V) adsorption can be suppressed by the presence of HCO3-, resulting in the fact that the arsenic removal rate is reduced to 15%. However, the addition of Zn2+ can offset the negative effect of bicarbonate on arsenic (V) adsorption by magnetite nanoparticles, thus, the arsenic (V) can be effectively removed by over 90% in 2 h, to meet the drinking water standard for arsenic (10 ug/L) set by world health organization.