Enhanced bacterial and virus disinfection with copper nanoparticle optimized LIG composite electrodes and filters

IF 5.9 2区 环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES
Nandini Dixit , Akhila M. Nair , Swatantra P. Singh
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引用次数: 0

Abstract

Waterborne pathogens pose a lifelong threat, necessitating advanced disinfection systems with state-of-the-art materials. Laser-Induced Graphene (LIG), a 3-dimensional form of graphene, is a widely known electrode material for its electrically-induced antimicrobial properties. However, LIG surfaces exhibit antimicrobial properties exclusively in the presence of electricity. In this work, copper-doped LIG (Cu-LIG) composite electrodes and filters were developed with enhanced antimicrobial properties in single-step laser scribing. The work emphasizes the optimization of copper doping with LIG for both electrical and non-electrical-based disinfection. The copper doping was optimized to a minimal concentration (∼1%) just to enhance the electrochemical properties of LIG. Furthermore, the excess addition of copper was helpful towards non-electricity-based treatment without significant leaching. The prepared surfaces were tested in both electrodes and filter configuration and showed excellent antibacterial and antiviral activity against mixed bacterial culture and a model enteric virus, MS2 bacteriophage. On the application of 2.5 V with Cu-LIG electrodes, 6-log removal of bacteria and virus was achieved. Furthermore, the membrane-based electroconductive filters were tested in a flow-through configuration and demonstrated 6-log removal at 2.5 V with a flux of ∼ 500 L m2 h−1 with both bacteria and viruses at minimum energy expense. Additionally, reactive oxygen species scavenging and hydrogen peroxide generation experiments have confirmed the role of electrical effects and indirect oxidation on the inactivation mechanism. The prepared Cu-LIG composite surfaces showed potential for environmental remediation applications.

利用纳米铜粒子优化 LIG 复合电极和过滤器增强细菌和病毒消毒效果
水传播的病原体对人类构成终生威胁,因此需要采用最先进材料的先进消毒系统。激光诱导石墨烯(LIG)是石墨烯的一种三维形式,是一种广为人知的电极材料,具有电诱导抗菌特性。然而,LIG 表面只在有电的情况下才表现出抗菌特性。在这项工作中,通过单步激光划片技术,开发出了抗菌性能更强的掺铜石墨烯(Cu-LIG)复合电极和过滤器。这项工作强调了在 LIG 中掺铜的优化,以实现基于电和非电的消毒。铜掺杂被优化到最低浓度(1%),以增强 LIG 的电化学特性。此外,过量添加铜有助于非电基处理,不会产生明显的沥滤。对制备的表面进行了电极和过滤器配置测试,结果表明其对混合细菌培养物和肠道病毒模型 MS2 噬菌体具有出色的抗菌和抗病毒活性。在 2.5 V 的电压下,Cu-LIG 电极可以去除 6 个菌落的细菌和病毒。此外,还在流过式配置中测试了基于膜的导电过滤器,结果表明,在 2.5 V 电压下,通量为 ∼ 500 L m2 h-1 时,细菌和病毒的去除率均为 6-log,且能耗最低。此外,活性氧清除和过氧化氢生成实验证实了电效应和间接氧化在灭活机制中的作用。制备的 Cu-LIG 复合表面显示出了环境修复应用的潜力。
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来源期刊
Journal of Environmental Sciences-china
Journal of Environmental Sciences-china 环境科学-环境科学
CiteScore
13.70
自引率
0.00%
发文量
6354
审稿时长
2.6 months
期刊介绍: The Journal of Environmental Sciences is an international journal started in 1989. The journal is devoted to publish original, peer-reviewed research papers on main aspects of environmental sciences, such as environmental chemistry, environmental biology, ecology, geosciences and environmental physics. Appropriate subjects include basic and applied research on atmospheric, terrestrial and aquatic environments, pollution control and abatement technology, conservation of natural resources, environmental health and toxicology. Announcements of international environmental science meetings and other recent information are also included.
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