摘要
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Cr3 + 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Cr3 + 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。
Five different types of FeOOH were utilized as adsorption materials in this study. Two sorts of natural goethite biomineralized by iron bacteria with different microstructures have twisted stalks and hollow sheath respectively. One type of goethite was synthesized with the common chemical method. Other two kinds of β_FeOOH were the inducing crystallization products with organic templates made of chitosan and polyethylene glycol. The experiments were conducted under the conditions of pH 5 and 6 for the adsorption of Cr 3+ and Cr 2O 2- 7 in water respectively. The results show that the two sorts of natural goethite adsorb obviously both cations and anions, and that their microstructures, particle sizes and morphologies can affect their adsorption. Nanocrystalline β_FeOOH also has good removal efficiency for Cr 3+ and Cr 2O 2- 7 in comparison with other samples. This is mainly attributed to the formation of surface metal_organic complexes which increase its chemical affinity with metal ions and chromate.
出处
《岩石矿物学杂志》
CAS
CSCD
北大核心
2003年第4期352-354,共3页
Acta Petrologica et Mineralogica
基金
国家自然科学基金资助项目 ( 4 0 0 72 0 15 )
