(1. 中南大學(xué) 冶金科學(xué)與工程學(xué)院，長(zhǎng)沙 410083；2. 蘭州石化公司研究院，蘭州 730060)
摘 要: 研究Zn2+和HCO3−對(duì)納米磁性鐵去除水中砷的影響。結(jié)果表明：Zn2+可以顯著增強(qiáng)納米磁性鐵對(duì)砷的吸附，使As(Ⅴ)去除率由原來(lái)的66%提高到99%以上； HCO3−對(duì)納米磁性鐵吸附砷具有明顯的抑制作用，使As(Ⅴ)去除率降至15%；而Zn2+可以削弱HCO3−對(duì)As(Ⅴ)吸附的抑制效應(yīng)，在較短時(shí)間內(nèi)(2 h)去除90%以上的As(Ⅴ)，達(dá)到世界衛(wèi)生組織規(guī)定的飲用水砷標(biāo)準(zhǔn)10 μg/L。
關(guān)鍵字: 砷；鋅；碳酸氫根；吸附；納米磁性鐵
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
