摘要
利用硫酸盐还原菌(SRB)原位合成纳米硫化亚铁(Nano-FeS)构建Nano-FeS@SRB体系还原Cr(Ⅵ)。通过电化学实验和电子传递抑制剂实验探究Nano-FeS对细胞电子传递性能的影响。实验结果表明,Nano-FeS@SRB具有较高的Cr(Ⅵ)还原能力,Cr(Ⅵ)的还原是微生物介导的过程,经Nano-FeS@SRB体系处理后,Cr(Ⅵ)被转化为低毒的Cr(OH);和Cr;O;。Nano-FeS增强了SRB的胞外电子传递,可作为电子穿梭体将细胞代谢产生的电子传递给Cr(Ⅵ),实现Cr(Ⅵ)到Cr(Ⅲ)的还原。在Cr(Ⅵ)初始质量浓度为20 mg/L、反应温度为35 ℃、体系pH为5.0的条件下,Cr(Ⅵ)去除率为93%。
Nano ferrous sulfide (Nano-FeS) was in-situ synthesized by sulfate reducting bacteria (SRB)and a Nano-FeS@SRB system was constructed for Cr(Ⅵ) reduction.The effects of Nano-FeS on the cell electron transfer properties were studied by electrochemical experiment and electron transport inhibitor experiment.The results show that the Nano-FeS@SRB has good ability for Cr(Ⅵ) reduction and the reduction of Cr(Ⅵ) is a microbial medicated process.After treated in the Nano-FeS@SRB system,Cr(Ⅵ) is converted to Cr(OH);and Cr;O;withlow toxicity.Besides,Nano-FeS can improve the microbial extracellular electron transferand can be used as an electron shuttle to transfer electrons produced by cell metabolism to Cr(Ⅵ),thus Cr(Ⅵ) is reduced to Cr(Ⅲ).The Cr(Ⅵ) removal rate of Nano-FeS@SRB is 93% under the optimum conditions of initial Cr(Ⅵ) mass concentration 20 mg/L,reaction temperature 35 ℃ and system pH 5.0.
作者
胡凡
陈元彩
胡勇有
程建华
HU Fan;CHEN Yuancai;HU Yongyou;CHENG Jianhua(The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters,Ministry of Education,School of Environment and Energy,South China University of Science and Technology,Guangzhou 510006,China)
出处
《化工环保》
CAS
CSCD
北大核心
2022年第1期61-67,共7页
Environmental Protection of Chemical Industry
基金
国家自然科学基金项目(41977316,21677052)。
