Electrochemical oxidation of reverse osmosis concentrates using enhanced TiO2-NTA/SnO2-Sb anodes with/without PbO2 layer

被引：54
作者：
Chen, Min [1 ]
Pan, Shuang [1 ]
Zhang, Cong [1 ]
Wang, Can [1 ,2 ]
Zhang, Weiqiu [2 ]
Chen, Zefang [2 ]
Zhao, Xin [1 ,2 ]
Zhao, Yingxin [1 ]
机构：
[1] Tianjin Univ, Sch Environm Sci & Engn, Tianjin 300350, Peoples R China
[2] Georgia Inst Technol, Sch Civil & Environm Engn, Brook Byers Inst Sustainable Syst, Atlanta, GA 30332 USA
来源：
CHEMICAL ENGINEERING JOURNAL | 2020年 / 399卷
基金：
国家重点研发计划;
关键词：
Reverse osmosis concentrates (ROCs); Electrochemical oxidation; Energy consumption; Enhanced TiO2 nanotube array (ENTA); WASTE-WATER TREATMENT; TIO2 NANOTUBE ARRAYS; ORGANIC POLLUTANTS; DEGRADATION; ELECTRODE; EFFICIENCY; KINETICS; REMOVAL; SYSTEM; REUSE;
D O I：
10.1016/j.cej.2020.125756
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
The traditional dimensional stable anodes (Ti/SnO2-Sb, Ti/PbO2) have poor electrochemical properties for further practical application. In this study, we fabricated two types of anodes for the treatment of reverse osmosis concentrates (ROCs). These two anodes were fabricated based on the enhanced nanotube array (ENTA) as internal structure. One anode is only coated by SnO2-Sb layer on the ENTA (Ti-ENTA/SnO2-Sb), while the other one is coated by SnO2-Sb layer and plus PbO2 layer (Ti-ENTA/SnO2-Sb/PbO2). It was found that the ENTA improved the electrochemical properties (e.g., oxygen evolution potential, HO center dot production) of the anodes. The conversion service lifetime of novel anodes were enhanced greatly than the traditional one. Then, we found that Ti-ENTA/SnO2-Sb anode has superior electro-catalytic than Ti-ENTA/SnO2-Sb/PbO2. In the range of current density of 5-20 mA cm(-2), the COD removal rate of ROCs for Ti-ENTA/SnO2-Sb anode and Ti-ENTA/SnO2-Sb/PbO2 anode were 0.12-0.23 mg min(-1) and 0.11-0.19 mg min(-1), respectively. Finally, we comprehensively compared the current efficiency and cost of ROCs degradation among various anodes. It was mentioned that novel anodes require lower energy cost (similar to 6.1 $/kg COD) during electrochemical process. Overall, electrochemical process is a cost-effective process and a very promising technology for practical application.
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页数：10
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