Persulfate enhanced photoelectrochemical oxidation of organic pollutants using self-doped TiO2 nanotube arrays: Effect of operating parameters and water matrix
- Authors
- Son, Aseom; Lee, Jiho; Lee, Changha; Cho, Kangwoo; Lee, Jaesang; Hong, Seok Won
- Issue Date
- 1-3월-2021
- Publisher
- PERGAMON-ELSEVIER SCIENCE LTD
- Keywords
- Organic pollutant; Peroxydisulfate; Photoelectrochemical; Reactive oxidant species; Self-doped TiO2 nanotube array
- Citation
- WATER RESEARCH, v.191
- Indexed
- SCIE
SCOPUS
- Journal Title
- WATER RESEARCH
- Volume
- 191
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/49491
- DOI
- 10.1016/j.watres.2021.116803
- ISSN
- 0043-1354
- Abstract
- This study investigated the influence of adding peroxydisulfate (PDS) to a photoelectrocatalysis (PEC) system using self-doped TiO2 nanotube arrays (bl-TNAs) for organic pollutant degradation. The addition of 1.0 mM PDS increased the bisphenol-A (BPA) removal efficiency of PEC (PEC/PDS) from 65.0% to 85.9% within 1 h. The enhancement could be attributed to the high formation yield of hydroxyl radicals ((OH)-O-center dot), increased charge separation, and assistance of the sulfate radicals (SO4 center dot-). The PDS concentration and applied potential bias were influential operating parameters for the PEC/PDS system. In addition, the system exhibited a highly stable performance over a wide range of pH values and background inorganic and organic constituents, such as chloride ions, bicarbonate, and humic acid. Further, the degradation performance of the organic pollutant mixture, including BPA, 4-chlorophenol (4-CP), sulfamethoxazole (SMX), and carbamazepine (CBZ), was evaluated in 0.1 M (NH4)(2)SO4 solution and real surface water. The degradation efficiency increased in the order of CBZ < SMX < 4-CP < BPA in the PEC and PEC/PDS systems with both water matrices. Compared with the PEC system, the PEC/PDS (1.0 mM) system showed a threefold higher pseudo first-order reaction rate constant for BPA among pollutant mixtures in surface water. This was attributed to enhanced (OH)-O-center dot production and the selective nature of SO4 center dot-. The pseudo first-order reaction rate constants of other pollutants, i.e., 4-CP, SMX, and CBZ increased ca. twofold in the PEC/PDS system. The results of this study showed that the PEC/PDS system with bl-TNAs is a viable technology for oxidative treatment. (c) 2021 Elsevier Ltd. All rights reserved.
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