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| Palladium nanoparticles synthesized by Thauera humireducens for catalytic chromium removal |
| Received:March 30, 2021 |
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| KeyWord:Thauera humireducens;palladium nanoparticles;biosynthesis;Cr(Ⅵ) |
| Author Name | Affiliation | E-mail | | ZHANG Wei | School of Water Resources and Environment, China University of Geosciences(Beijing), Beijing 100083, China | | | WANG Xi | School of Water Resources and Environment, China University of Geosciences(Beijing), Beijing 100083, China | | | LI Yina | School of Water Resources and Environment, China University of Geosciences(Beijing), Beijing 100083, China | | | GUO Lin | Shanghai Academy of Environmental Sciences, Shanghai 200233, China | | | ZHANG Baogang | School of Water Resources and Environment, China University of Geosciences(Beijing), Beijing 100083, China | baogangzhang@cugb.edu.cn |
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| Abstract: |
| To prepare excellent catalysts through environmentally friendly processes, this study used the denitrifying bacteria Thauera humireducens(T. humireducens) to synthesize palladium nanoparticles(Pd-NPs). The Pd-NPs synthesized by T. humireducens were evaluated for their performance in removing Cr(Ⅵ) from groundwater. Results indicated that T. humireducens was able to produce welldispersed Pd-NPs with a concentrated size distribution of 2~6 nm within 24 h. Higher initial concentrations of Pd(Ⅱ), sodium formate, and microbial inoculum, or a weakly acidic environment, increased the efficiency of Pd-NPs synthesized by T. humireducens. Compared with chemically prepared Pd-NPs, the Pd-NPs synthesized by T. humireducens were able to catalyze Cr(Ⅵ) reduction more efficiently, with a 95% Cr(Ⅵ) reduction efficiency within 1.5 h. The Pd-NPs synthesized by T. humireducens were also able to catalyze the reduction of Cr(Ⅵ) to insoluble Cr(Ⅲ). After three cycles of recycling, the catalytic performance of Pd-NPs synthesized by T. humireducens only decreased by 13%. This study demonstrates for the first time that the rapid synthesis of Pd-NPs can be achieved by T. humireducens, resulting in a synthesized material with a high catalytic performance for application in remediation of Cr(Ⅵ) contaminated groundwater. |
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