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Photocatalytic ozonation for sea water decontamination
Tsoi, Chi Chung1; Huang, Xiaowen2; Leung, Polly H. M.3; Wang, Ning4; Yu, Weixing5; Jia, Yanwei6; Li, Zhaohui7; Zhang, Xuming1
作者部门光谱成像技术研究室
2020-10
发表期刊JOURNAL OF WATER PROCESS ENGINEERING
ISSN2214-7144
卷号37
产权排序5
摘要

Polluted sea water is a common problem in coastal cities, but its decontamination remains a big challenge due to the existence of salt ions, which may invalidate many prevailing treatment methods originally developed for waste fresh water. This work presents the first attempt to decontaminate the polluted sea water by synergizing two separate processes: photocatalysis and ozonation. For low cost and human safety, the ozone concentration is kept to be < 60 ppm in the pumping gas (0.026 ppm in solution). Mechanism studies and experimental comparisons show that the photocatalysis, the ozonation and the photocatalytic ozonation (PCO) all have lower efficiencies in sea water than that in fresh water, and the PCO is always more efficient than only the photo catalysis or only the ozonation. More specifically, the PCO has a reaction rate constant about 23 times higher than only the ozonation. In addition, the sea water shows a positive synergistic effect of photocatalysis and ozonation and reaches the maximum when the pumping gas has an ozone concentration of 50 ppm in gas. In contrast, the fresh water shows a negative synergistic effect. Mechanism study using experiments infers that the dissolved ozone can enhance and stabilize the photocurrent by rapidly scavenging the photoelectrons. This work may pave the way to practical applications of sea water decontamination with high efficiency and low cost.

关键词Photocatalysis Ozonation Sea water Decontamination Wastewater treatment
DOI10.1016/j.jwpe.2020.101501
收录类别SCI
语种英语
WOS记录号WOS:000575570800005
出版者ELSEVIER
引用统计
被引频次:6[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.opt.ac.cn/handle/181661/93738
专题光谱成像技术研究室
通讯作者Zhang, Xuming
作者单位1.Hong Kong Polytech Univ, Dept Appl Phys, Hong Kong, Peoples R China
2.Qilu Univ Technol, Dept Bioengn, State Key Lab Biobased Mat & Green Papermaking, Shandong Acad Sci, Jinan, Shandong, Peoples R China
3.Hong Kong Polytech Univ, Dept Hlth Technol & Informat, Hong Kong, Peoples R China
4.Wuhan Univ Technol, Natl Engn Lab Fiber Opt Sensing Technol, Wuhan, Peoples R China
5.Chinese Acad Sci, Xian Inst Opt & Precis Mech, Key Lab Spectral Imaging Technol, Xian, Peoples R China
6.Univ Macau, Inst Microelect, State Key Lab Analog & Mixed Signal VLSI, Macau, Peoples R China
7.Sun Yat Sen Univ, Sch Elect & Informat Engn, Guangzhou, Peoples R China
推荐引用方式
GB/T 7714
Tsoi, Chi Chung,Huang, Xiaowen,Leung, Polly H. M.,et al. Photocatalytic ozonation for sea water decontamination[J]. JOURNAL OF WATER PROCESS ENGINEERING,2020,37.
APA Tsoi, Chi Chung.,Huang, Xiaowen.,Leung, Polly H. M..,Wang, Ning.,Yu, Weixing.,...&Zhang, Xuming.(2020).Photocatalytic ozonation for sea water decontamination.JOURNAL OF WATER PROCESS ENGINEERING,37.
MLA Tsoi, Chi Chung,et al."Photocatalytic ozonation for sea water decontamination".JOURNAL OF WATER PROCESS ENGINEERING 37(2020).
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