Journal
DESALINATION
Volume 538, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.desal.2022.115899
Keywords
Self-doped black TiO2 nanotube array; Photoelectrochemical oxidation; Flow-electrode capacitive deionization; Hue-gas desulfurization wastewater
Categories
Funding
- National Research Foundation of Korea (NRF) - Korea government (MSIT) [NRF2021R1A5A1032433]
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This study proposes two integrated electrochemical methods for the reuse of flue-gas desulfurization wastewater (FGDW): photoelectrochemical oxidation (PECO) using a self-doped black TiO2 nanotube array (Black-TNA) catalyst and flow-electrode capacitive deionization (FCDI). The study found that the electrocatalytic activity and oxidative performance of the Black-TNA annealed at 600 degrees C were superior to those of the conventional Blue-TNA. Furthermore, the use of Black-TNA in PECO under sulfate-based conditions showed exceptional degradative results for the removal of organic pollutants. The study also confirmed the feasibility of using FGDW as a flow-electrode electrolytic solution in the FCDI system, and demonstrated that the integrated PECO-FCDI system can effectively remove organic pollutants and salts without the use of additional chemicals.
This study proposes two integrated electrochemical methods for the reuse of flue-gas desulfurization wastewater (FGDW): photoelectrochemical oxidation (PECO) using a self-doped black TiO2 nanotube array (Black-TNA) catalyst and flow-electrode capacitive deionization (FCDI). The electrocatalytic activity and oxidative performance of the Black-TNA annealed at 600 degrees C were superior to those of the conventional Blue-TNA, as determined via Mott-Schottky and cyclic voltammetry plots. Furthermore, the removal of organic pollutants via PECO under sulfate-based conditions using the Black-TNA showed exceptional degradative results. Subsequently, FGDW was introduced to the FCDI system to evaluate its feasibility as a flow-electrode electrolytic solution in comparison with other synthetic electrolytes (NaCl, Na2SO4, and NaCl/Na2SO4 composite), and was confirmed for its feasibility. Thus, the integrated PECO-FCDI system was demonstrated to be an effective means of removing organic pollutants and salts without the use of additional chemicals.
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