Flower Pollen-Based Photosensitization Process for Enhanced Solar Disinfection of Drinking Water: Reactor Design and Inactivation Mechanisms
Flower Pollen-Based Photosensitization Process for Enhanced Solar Disinfection of Drinking Water: Reactor Design and Inactivation Mechanisms
复制标题
基于花粉的光敏工艺增强饮用水的日光消毒：反应器设计和灭活机制
DOI：
10.1021/acsestengg.1c00314
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发表时间：
2022
影响因子：
7.1
通讯作者：
Chun He
中科院分区：
文献类型：
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作者：
Zhuoyun Tang;Ran Yin;Wei Qu;Huadan Liu;Huijun Luo;Dehua Xia;Yajing Huang;Longfei Shu;Chun He
太阳能消毒（SODIS）是实现可持续发展目标6（可持续发展目标6）的一种无化学品、低成本和用户友好的方法。本研究制备了一种天然花粉光敏剂，用于改进传统的SODIS工艺。完全灭活5种生物危害菌（大肠杆菌k -12、棘球绦虫sp.BM1-1、枯草芽孢杆菌孢子、粪肠球菌和四环素耐药）。通过间歇式反应器和带固定分离回收系统的流式反应器，可使大肠杆菌（Coli）达到可培养或可存活但不可培养的状态。在这里，由于静电吸引和拓扑相互作用，微生物粘附在光敏剂表面。光敏剂在太阳照射下产生局部加热效应，部分微生物被光热效应灭活。同时，产生了大量的活性物质（•OH和1o2），并对微生物的光催化失活起作用。光热和光催化过程之间的协同作用增强了细胞膜的破坏和活性物质的渗透。提出并验证了一种综合失活途径。研究结果表明，基于天然花粉的光敏化工艺有望增强SODIS的有效消毒，从而帮助农村和欠发达地区实现可持续发展目标6。
Solar disinfection (SODIS) is a chemical-free, low-cost, and user-friendly approach to achieving Sustainable Development Goal No. 6 (SDG 6). Herein, a natural flower pollen-based photosensitizer was fabricated in a facile way and used to enhance the conventional SODIS process. Complete inactivation of five biohazards (Escherichia coliK-12,Spingopyxis sp.BM1-1,Bacillus subtilisspores,Enterococcus faecalis, and tetracycline-resistantE. coli) at their culturable or viable but nonculturable states was achieved by both batch reactors and a flow-through reactor with a standing separation–recycling system. Herein, microorganisms adhered to the photosensitizer’s surface due to electrostatic attraction and topological interactions. The photosensitizer induced the localized heating effect under solar irradiation, and a portion of microorganisms was inactivated by the photothermal effect. Meanwhile, abundant reactive species (•OH and1O2) were generated and contributed to the photocatalytic inactivation of microorganisms. Synergism between the photothermal and photocatalytic processes enhanced the destruction of cell membranes and the penetration of reactive species. A comprehensive inactivation pathway was proposed and verified. The findings suggested that the natural flower pollen-based photosensitization process is promising to enhance the SODIS for effective disinfection, which assists rural and underdeveloped areas in achieving SDG 6.