Graphene oxide composite membrane accelerates organic pollutant degradation by Shewanella bacteria
Graphene oxide composite membrane accelerates organic pollutant degradation by Shewanella bacteria
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DOI：
10.2166/wst.2021.285
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发表时间：
2021-07
影响因子：
2.7
通讯作者：
Zhi Li;Jun Zhao;Bianhua Liu;Linlin Yang;Guangmei Han;Fan Yang;Shuai Han;Zhenyang Wang;Zhongpin Zhang
中科院分区：
文献类型：
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作者：
Zhi Li;Jun Zhao;Bianhua Liu;Linlin Yang;Guangmei Han;Fan Yang;Shuai Han;Zhenyang Wang;Zhongpin Zhang
细菌降解各种有机污染物已被证明是一种经济、环保的方法。使这些技术广泛使用的关键挑战是它们的降解效率较低。本文报道了一种由氧化石墨烯和聚乙烯醇(GO-PVA)组成的复合膜，它可以显著提高希瓦氏菌对刚果红(CR)的降解效率和速率。72h时，希瓦氏菌单独对CR溶液的降解率约为42%，加入GO-PVA膜后，36h的降解率达到91%，与单独使用希瓦氏菌相比，GO-PVA膜和希瓦氏菌对CR的降解效率提高了2倍，降解率提高了4倍。这表明在希瓦氏藻降解CR的过程中，通过增加GO-PVA膜的投加量，可以快速、完全地降解CR。此外，GO-PVA膜具有良好的可回收性和可重复使用性。经过10次循环后，GO-PVA膜的生物催化性能没有下降。此外，还讨论了GO-PVA膜在CR降解过程中的作用和降解产物。
Degradation of various organic pollutants by bacteria has been proved to be an economical and environmentally friendly method. The key challenge in making these technologies widely available is their low degradation efficiency. Here, we report a composite membrane composed of graphene oxide and polyvinyl alcohol (GO-PVA) which can markedly enhance the efficiency and rate of Shewanella bacteria to degrade Congo red (CR). The degradation efficiency of Shewanella bacteria alone on CR solution was about 42% at 72 h. After the addition of the GO-PVA membrane, the degradation efficiency reached 91% at the degradation time at 36 h. The degradation efficiency of CR was increased by two times and the degradation rate was increased by four times in the presence of GO-PVA membrane and Shewanella bacteria compared to Shewanella bacteria alone. This indicates that the CR could be rapidly and completely degraded by increasing the input amounts of GO-PVA membrane in the process of Shewanella algae degradation of CR. Moreover, the GO-PVA membrane showed good recyclability and reusability. The biocatalysts performance of the GO-PVA membrane did not decrease after 10 cycles. Furthermore, the role of the GO-PVA membrane in the degradation process and the degradation products of CR were discussed.