Long Tian, Peng Zhou, Zhaoyang Su, Nigel Graham and Wenzheng Yu*,
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引用次数: 0
Abstract
Significant progress has been made previously in the research and development of graphene oxide (GO) membranes for water purification, but their biofouling behavior remains poorly understood. In this study, we investigated the biofilm formation and biofouling of GO membranes with different surface microstructures in the context of filtering natural surface water and for an extended operation period (110 days). The results showed that the relatively hydrophilic and smooth Fe(OH)3/GO membrane shaped a thin and spatially heterogeneous biofilm with high stable flux. However, the ability to simultaneously mitigate biofilm formation and reduce biofouling was not observed in the weakly hydrophilic and wrinkled Fe/GO and H–Fe(OH)3/GO membranes. Microbial analyses revealed that the hydrophilicity and roughness distinguished the bacterial communities and metabolic functions. The organic matter-degrading and predatory bacteria were more adapted to hydrophilic and smooth GO surfaces. These functional taxa were involved in the degradation of extracellular polymeric substances (EPS), and improved biofilm heterogeneity. In contrast, the weakly hydrophilic and wrinkled GO surfaces had reduced biodiversity, while unexpectedly boosting the proliferation of EPS-secreting bacteria, resulting in increased biofilm formation and aggravated biofouling. Moreover, all GO membranes achieved sustainable water purification during the entire operating period.
此前,用于水净化的氧化石墨烯(GO)膜的研究和开发取得了重大进展,但对其生物污损行为的了解仍然很少。在本研究中,我们以过滤天然地表水为背景,研究了不同表面微结构的 GO 膜在长时间(110 天)运行下的生物膜形成和生物污损情况。结果表明,相对亲水且光滑的 Fe(OH)3/GO 膜形成了一层薄且空间异构的生物膜,具有较高的稳定通量。然而,在亲水性弱、起皱的 Fe/GO 膜和 H-Fe(OH)3/GO 膜上,却观察不到同时缓解生物膜形成和减少生物污染的能力。微生物分析表明,亲水性和粗糙度可区分细菌群落和代谢功能。有机物降解细菌和捕食细菌更适应亲水性和光滑的 GO 表面。这些功能类群参与了胞外聚合物质(EPS)的降解,并改善了生物膜的异质性。相反,亲水性弱和起皱的 GO 表面生物多样性减少,却意外地促进了分泌 EPS 的细菌的增殖,导致生物膜形成增加,生物污染加剧。此外,在整个运行期间,所有 GO 膜都实现了可持续的水净化。
期刊介绍:
Environmental Science & Technology (ES&T) is a co-sponsored academic and technical magazine by the Hubei Provincial Environmental Protection Bureau and the Hubei Provincial Academy of Environmental Sciences.
Environmental Science & Technology (ES&T) holds the status of Chinese core journals, scientific papers source journals of China, Chinese Science Citation Database source journals, and Chinese Academic Journal Comprehensive Evaluation Database source journals. This publication focuses on the academic field of environmental protection, featuring articles related to environmental protection and technical advancements.