Exploring the use of ceramic disk filter coated with Ag/ZnO nanocomposites as an innovative approach for removing Escherichia coli from household drinking water

被引：30

作者：

Huang, Jing ^{[1
,2
]}

Huang, Guohe ^{[1
]}

An, Chunjiang ^{[3
]}

Xin, Xiaying ^{[4
]}

Chen, Xiujuan ^{[1
]}

Zhao, Yanyun ^{[2
]}

Feng, Renfei ^{[5
]}

Xiong, Wenhui ^{[6
]}

机构：

[1] Univ Regina, Inst Energy Environm & Sustainable Communities, Regina, SK S4S 0A2, Canada

[2] North China Elect Power Univ, MOE Key Lab Resources & Environm Syst Optimizat, Beijing 102206, Peoples R China

[3] Concordia Univ, Dept Bldg Civil & Environm Engn, Montreal, PQ H3G 1M8, Canada

[4] Mem Univ Newfoundland, Fac Engn & Appl Sci, St John, NF A1B 3X5, Canada

[5] Canadian Light Source, Saskatoon, SK S7N 2 V3, Canada

[6] Stantec Consulting Ltd, Saskatoon, SK S7K 0K3, Canada

来源：

CHEMOSPHERE | 2020年 / 245卷

基金：

加拿大自然科学与工程研究理事会;

关键词：

Ag/ZnO nanocomposite; Ceramic disk filter; E. coli removal; Antibacterial activity; Removal mechanism; Synchrotron-based analysis; ANTIBACTERIAL ACTIVITY; POT FILTERS; PERFORMANCE; POINT; ZNO; DESIGN; SUSTAINABILITY; DISINFECTION; OPTIMIZATION; POLLUTION;

D O I：

10.1016/j.chemosphere.2019.125545

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Ceramic water filter is suitable for low-income families and rural communities in developing countries to obtain safe drinking water because of its low cost and good performance. As an innovative effort, the ceramic disk filter coated with Ag/ZnO nanocomposites (AZ-CDF) was proposed in this study. The manufacture of AZ-CDFs was optimized by experiments based on the Box-Behnken design. The results of thermal field emission scanning electron microscopy (TFE-SEM) and very powerful elemental and structural probe employing radiation from a synchrotron (VESPERS) indicated that Ag/ZnO nanocomposites were mainly distributed on the upper surface of AZ-CDF. The antibacterial activity of AZ-CDF was investigated by detecting the variation of cell status and intracellular reactive oxygen species during a period of time using flow cytometry. Both non-photocatalytic and photocatalytic antibacterial activities of AgiZnO nanocomposite contributed to the bacterial reduction property of AZ-CDF. During filtration, the initial Escherichia coli (E. coli) concentration and illumination intensity also influenced the E. coli removal performance of AZ-CDF. When the light illumination intensity was 7000 Lux, AZ-CDF was appropriate to treat the water contaminated by E. coli concentration of less than 10(3) cfu/mL Increasing illumination intensity resulted in the improvement of E. coli removal performance of AZ-CDF. It was concluded the main mechanisms for the E. coli removal of AZ-CDF were filtration, non-photocatalytic and photocatalytic antibacterial activities. (C) 2019 Elsevier Ltd. All rights reserved.

引用

页数：9

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