Biogenic palladium prepared by activated sludge microbes for the hexavalent chromium catalytic reduction: Impact of relative biomass  

作　　者：Luman Zhou Chengyang Wu Yuwei Xie Siqing Xia 

机构地区：[1]State Key Laboratory of Pollution Control and Resource Reuse,College of Environmental Science and Engineering,Tongji University,Shanghai 200092,China [2]Shanghai Institute of Pollution Control and Ecological Security,Shanghai 200092,China

出　　处：《Frontiers of Environmental Science & Engineering》2020年第2期151-159,共9页环境科学与工程前沿（英文）

基　　金：the National Natural Science Foundation of China(Grant No.51678422);the Fundamental Research Funds for the Central Universities(No.22120190017).

摘　　要：Palladium,a kind of platinum group metal,owns catalytic capacity for a variety of hydrogenations.In this study,Pd nanoparticles(PdNPs)were generated through enzymatic recovery by microbes of activated sludge at various biomass/Pd,and further used for the Cr(VI)reduction.The results show that biomass had a strong adsorption capacity for Pd(II),which was 17.25 mg Pd/g sludge.The XRD and TEM-EDX results confirmed the existence of PdNPs associated with microbes(bio-Pd).The increase of biomass had little effect on the reduction rate of Pd(II),but it could cause decreasing particle size and shifting location of Pd(0)with the better dispersion degree on the cell surface.In the Cr(VI)reduction experiments,Cr(VI)was first adsorbed on bio-Pd with hydrogen and then reduced using active hydrogen as electron donor.Biomass improved the catalytic activity of PdNPs.When the biomass/Pd(w/w)ratio increased to six or higher,Cr(VI)reduction achieved maximum rate that 50 mg/L of Cr(VI)could be rapidly reduced in one minute.

关 键 词：PALLADIUM nanoparticles ACTIVATED SLUDGE Hexavalent CHROMIUM 

分 类 号：X703[环境科学与工程—环境工程]