MoS2 nanoflowers-activated peroxydisulfate oxidation for rapid and efficient water disinfection

Q1 Environmental Science

Water Cycle Pub Date : 2022-01-01 DOI:10.1016/j.watcyc.2022.04.001

Ying-Wen Lu , Chun Wang , Nirav Joshi , Hai Liu

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引用次数: 8

Abstract

MoS₂ nanoflowers were fabricated and deposited on porous graphite felt (MoS₂-GF) via the hydrothermal treatment to activate peroxydisulfate (PDS) for water disinfection. The surface textural and chemical characterization indicated that the MoS₂ nanoflowers were successfully grown on the graphite felt. MoS₂-activated PDS oxidation with 0.25 g/L MoS₂ and 0.2 mM PDS achieved above 7-log removal of E. coli within contact time of 25 min. Gram-negative bacteria (E. coli and P. aeruginosa) were more sensitive to the oxidation reactions than the Gram-positive ones (E. faecalis and S. aureus) due to their larger cell sizes and thinner wall thicknesses. The live/dead backlight staining experiments and scanning electron microscopy characterization revealed that the bacteria were inactivated via cell membrane damage. The free radical quenching experiments suggested that the SO₄^•-, •OH, and •O²⁻ were the main reactive radicals involved into bacteria inactivation. The MoS₂-activated PDS oxidation also achieved undetectable heterotrophic plate count for real river water lake water within contact time of 120 min.

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MoS2纳米花激活过氧二硫酸盐氧化用于快速高效的水消毒

通过水热活化过硫酸氢盐(PDS)对水进行消毒，制备了MoS2纳米花并沉积在多孔石墨毡(MoS2- gf)上。表面结构和化学表征表明，MoS2纳米花在石墨毡上成功生长。在0.25 g/L MoS2和0.2 mM PDS的条件下，在25 min的接触时间内，对大肠杆菌的去除率达到7 log以上。革兰氏阴性菌(大肠杆菌和铜绿假单胞菌)比革兰氏阳性菌(粪肠杆菌和金黄色葡萄球菌)对氧化反应更敏感，因为革兰氏阴性菌的细胞大小更大，壁厚更薄。活/死背光染色实验和扫描电镜表征表明，细菌是通过细胞膜损伤而失活的。自由基猝灭实验表明，SO4•-、•OH和•O2−是参与细菌灭活的主要活性自由基。二硫化钼激活的PDS氧化在120min的接触时间内对真实的河水湖水也实现了无法检测到的异养板计数。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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