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一种可回收的矿物催化剂,用于可见光驱动的光催化细菌灭活:天然磁性闪锌矿。

A recyclable mineral catalyst for visible-light-driven photocatalytic inactivation of bacteria: natural magnetic sphalerite.

机构信息

School of Life Sciences, The Chinese University of Hong Kong , Shatin, NT, Hong Kong SAR, China.

出版信息

Environ Sci Technol. 2013 Oct 1;47(19):11166-73. doi: 10.1021/es402170b. Epub 2013 Sep 23.

Abstract

Motivated by recent studies that well-documented mineral photocatalyst for bacterial inactivation, a novel natural magnetic sphalerite (NMS) in lead-zinc deposit was first discovered and evaluated for its visible-light-driven (VLD) photocatalytic bactericidal properties. Superior to the reference natural sphalerite (NS), vibrating sampling magnetometeric (VSM) analysis revealed the ferromagnetic property of NMS, indicating its potential for easy separation after use. Under the irradiation of fluorescence tubes, NMS could inactivate 7 log10 Gram-negative Escherichia coli K-12 without any regrowth and metal ions leached out from NMS show no toxicity to cells. The cell destruction process starting from cell wall to intracellular components was verified by TEM. Some products from damaged cells such as aldehydes, ketones and carboxylic acids were identified by FTIR with a decrease of cell wall functional groups. The relative amounts of potassium ion leakage from damaged cells gradually increased from initial 0 to approximately constant concentration of 1000 ppb with increasing reaction time. Superoxide radical (•O2(-)) rather than hydroxyl radical (•OH) was proposed to be the primary reactive oxidative species (ROSs) responsible for E. coli inactivation by use of probes and electron spin resonance (ESR). H2O2 determined by fluorescence method is greatly involved in bacterial inactivation in both nonpartition and partition system. Multiple cycle runs revealed excellent stability of recycled NMS without any significant loss of activity. This study provides a promising natural magnetic photocatalyst for large-scale bacterial inactivation, as NMS is abundant, easily recycled and possessed an excellent VLD bacterial inactivation ability.

摘要

受近期大量研究的启发,这些研究证明了矿物光催化剂在细菌失活方面的有效性,我们首次发现了一种新型天然磁性闪锌矿(NMS),并评估了其在可见光驱动(VLD)光催化杀菌性能。与参考天然闪锌矿(NS)相比,振动样品磁强计(VSM)分析显示 NMS 具有铁磁性,表明其在使用后易于分离。在荧光灯管的照射下,NMS 可以在不进行任何再生的情况下灭活 7 个对数的革兰氏阴性大肠杆菌 K-12,并且从 NMS 中浸出的金属离子对细胞没有毒性。通过 TEM 验证了从细胞壁到细胞内成分的细胞破坏过程。通过 FTIR 鉴定了从受损细胞中产生的一些产物,如醛、酮和羧酸,同时细胞壁功能基团的数量减少。从受损细胞中钾离子泄漏的相对量从初始 0 逐渐增加到约 1000ppb 的恒定浓度,随着反应时间的增加而增加。使用探针和电子自旋共振(ESR),我们提出超氧自由基(•O2(-))而不是羟基自由基(•OH)是导致大肠杆菌失活的主要活性氧化物种(ROSs)。荧光法测定的 H2O2 极大地参与了非分隔和分隔体系中细菌的失活。多循环运行表明,回收的 NMS 具有出色的稳定性,没有任何活性损失。这项研究为大规模细菌失活提供了一种有前途的天然磁性光催化剂,因为 NMS 丰富、易于回收且具有出色的 VLD 细菌失活能力。

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