(1. 中南大学 冶金科学与工程学院，长沙 410083；2. 兰州石化公司研究院，兰州 730060)
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。
关键字: 砷；锌；碳酸氢根；吸附；纳米磁性铁
drinking water by magnetite nanoparticles
（1. School of Metallurgical Science and Engineering, Central South University, Changsha 410083, China;
2. Research Institute of Lanzhou Petrochemical Company, Lanzhou 730060, China）
Abstract:The effects of Zn2+ and HCO3− 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 μg/L) set by world health organization.
Key words: arsenic; zinc; bicarbonate; adsorption; magnetite nanoparticles
