期刊论文

Selective removal of U(VI) by immobilized sulfate-reducing bacteria

Xie, S.-B.(xiesbmr@263.net)

中文

原子能科学技术

Yuanzineng Kexue Jishu/Atomic Energy Science and Technology

1000-6931

2014

48

4

583-590

10.7538/yzk.2014.48.04.0583

国家自然科学基金项目(11175081,21177053)； 湖南省科技计划重点项目(2011K2015)；

本校为第一且通讯机构

利用聚乙烯醇和海藻酸钠制备了硫酸盐还原菌微球,探讨了Zn~(2+)、Cu~(2+)、乙酸钠、草酸钠和柠檬酸钠对其还原U (Ⅵ)的影响,考察了其选择性去除U (Ⅵ)的工艺。实验结果表明,当Zn~(2+)或Cu~(2+)浓度低于100 mg/L时,U (Ⅵ)还原未受显著影响,但当其增至150 mg/L时,U (Ⅵ)还原被完全抑制。当单齿配体有机物(乙酸钠)存在时,U(Ⅵ)可被彻底还原;而多齿配体有机物(草酸钠和柠檬酸钠)存在时,会延缓甚至完全抑制U(Ⅵ)的还原。对于无机-U(Ⅵ)-重金属体系,可利用U(Ⅵ)和硫酸盐还原自由能的差异,适当降低COD/SO_4~(2-)比值直接选择性去除U (Ⅵ);对于有机-U (Ⅵ)-重金属体系,可通过多齿配体有机物络合U(Ⅵ),同...

The sulfate-reducing bacteria immobilized in polyvinyl alcohol-sodium alginate beads were prepared. The impacts of Zn2+, Cu2+, acetate, oxalate and citrate on the reduction of U(VI) were investigated. Furthermore, selective removal of U(VI) or heavy metals was assessed. The results indicate that the existing of Zn2+ or Cu2+ doesn't affect U(VI) removal appreciably when their concentrations are less than 100 mg/L, but they can inhibit U(VI) removal completely while their concentrations reach 150 mg/L. In the presence of monodentate ligand (acetate), U(VI) can be removed readily, whereas multide...