几种不同类型的FeOOH吸附水溶液中铬离子研究

采用两种显微结构不同的螺旋状和管状构造的天然铁细菌矿化针铁矿和化学合成的α—FeOOH及两种有机高分子模板矿化结晶的β-FeOOH作为吸附材料，分别在pH=5和6时对含Cr^3 和Cr(Ⅵ)废水进行了吸附实验研究，结果表明，天然生物矿化针铁矿对金属阳离子和阴离子均有明显的吸附作用，其显微结构、大小和形态影响其吸附能力；纯化学合成的针铁矿对铬离子的吸附能力较低；通过有机模板合成的纳米微晶β-FeOOH对Cr^3 和Cr(Ⅵ)均有极高的去除率，这与其表面存在与有机分子络合作用、增大了其表面对金属离子和铬酸根的化学亲合力有关。

A comparative study of the adsorption of chromium on five different types of FeOOH

The main goal of a series of Laboratory experiments was to determine the efficency of iron for removing hexavalent chromiun.The results indicate that the reductive reaction of zero-valent iron with hexavalent chromium reaches the quasi- first-order standard,that the ratio of the granular iron (BTE2.89m2/g)to solution increases from 0.5g/100 ml to 2.0g/100ml,and that the reaction time is reduced from 26.7 min to 3.6 min. It is also shown that the reaction time should be prolonged to meet the standard of dringking water because the concentration of initial solution within 30 mg/L increases when the quantity of iron is stable,and that the raising of the temperature promotes the removal of hexavalent chromium when other conditions are constant.