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 |
ISSN | 2214-7144 |
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 |
DOI | 10.1016/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 | |
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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Photocatalytic ozona(1476KB) | 期刊论文 | 出版稿 | 限制开放 | CC BY-NC-SA | 请求全文 |
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