Wu Xiayuan, Li Chunrui, Lv Zuopeng, Zhou Xiaowei, Chen Zixuan, Jia Honghua, Zhou Jun, Yong Xiaoyu, Wei Ping, Li Yan
College of Biotechnology and Pharmaceutical Engineering, Nanjing Tech University No. 30 Puzhu Road(S) Nanjing 211816 Jiangsu China
The Key Laboratory of Biotechnology for Medicinal Plants of Jiangsu Province, Jiangsu Normal University Xuzhou 221116 China.
RSC Adv. 2020 Apr 17;10(26):15107-15115. doi: 10.1039/d0ra01471k. eCollection 2020 Apr 16.
Cr(vi) laden wastewaters generally comprise a range of multiple heavy metals such as Au(iii) and Cu(ii) with great toxicity. In the present study, cooperative cathode modification by biogenic Au nanoparticles (BioAu) reduced from aqueous Au(iii) and Cu(ii) co-reduction were investigated for the first time to enhance Cr(vi) removal in microbial fuel cells (MFCs). With the co-existence of Cu(ii) in the catholyte, the MFC with carbon cloth modified with nanocomposites of multi-walled carbon nanotubes blended with BioAu (BioAu/MWCNT) obtained the highest Cr(vi) removal rate (4.07 ± 0.01 mg L h) and power density (309.34 ± 17.65 mW m), which were 2.73 and 3.30 times as high as those for the control, respectively. The enhancements were caused by BioAu/MWCNT composites and deposited reduzates of Cu(ii) on the cathode surface, which increased the adsorption capacity, electronic conductivity and electrocatalytic activity of the cathode. This study provides an alternative approach for efficiently remediating co-contamination of multiple heavy metals and simultaneous bioenergy recovery.
含六价铬的废水通常包含一系列多种重金属，如具有高毒性的金（III）和铜（II）。在本研究中，首次研究了通过从水相金（III）还原得到的生物源金纳米颗粒（BioAu）以及铜（II）共还原进行的协同阴极改性，以提高微生物燃料电池（MFC）中六价铬的去除率。在阴极电解液中存在铜（II）的情况下，用多壁碳纳米管与BioAu的纳米复合材料（BioAu/MWCNT）改性的碳布制成的MFC获得了最高的六价铬去除率（4.07±0.01 mg L h）和功率密度（309.34±17.65 mW m），分别是对照的2.73倍和3.30倍。这些增强作用是由BioAu/MWCNT复合材料以及阴极表面铜（II）的沉积还原产物引起的，它们提高了阴极的吸附能力、电子导电性和电催化活性。本研究为有效修复多种重金属的共同污染以及同时回收生物能源提供了一种替代方法。
