| 张巍,王希,李依娜,郭琳,张宝刚.Thauera humireducens合成钯纳米颗粒及其催化除铬性能研究[J].农业环境科学学报,2021,40(12):2742-2750. |
| Thauera humireducens合成钯纳米颗粒及其催化除铬性能研究 |
| Palladium nanoparticles synthesized by Thauera humireducens for catalytic chromium removal |
| 投稿时间：2021-03-30 |
| DOI：10.11654/jaes.2021-0380 |
| 中文关键词: Thauera humireducens 钯纳米颗粒 生物合成 Cr (Ⅵ) |
| 英文关键词: Thauera humireducens palladium nanoparticles biosynthesis Cr(Ⅵ) |
| 基金项目:国家重点研发计划项目（2018YFC1802401）；北京市自然科学基金项目（8192040） |
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| 中文摘要: |
| 为了提供制备过程环境友好、性能良好的催化剂，采用反硝化菌Thauera humireducens（T.humireducens）合成钯纳米颗粒（Pd-NPs），并评价其催化去除地下水中Cr（Ⅵ）的性能。结果表明：利用T.humireducens能够在24 h内制得尺寸集中分布在2~6nm、分散良好的Pd-NPs。提高初始Pd（Ⅱ）和HCOONa浓度、增大微生物接种量及营造弱酸性环境，均能加快T.humireducens合成Pd-NPs的速率。相比于化学方法制备的Pd-NPs，T.humireducens合成的Pd-NPs能够更高效地将Cr（Ⅵ）催化还原为不溶的Cr（Ⅲ），1.5 h内Cr（Ⅵ）的还原效率达95%。循环使用3个周期后，T.humireducens合成的Pd-NPs的催化活性仅下降13%。本研究首次证明反硝化菌T.humireducens可快速合成Pd-NPs，且合成的Pd-NPs可用于地下水的铬污染治理。 |
| 英文摘要: |
| 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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