4.7 Article

Black-TiO2 based photoelectrochemical oxidation of flue-gas desulfurization wastewater for effective reuse in flow-electrode CDI

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

Funding

  1. National Research Foundation of Korea (NRF) - Korea government (MSIT) [NRF2021R1A5A1032433]

Ask authors/readers for more resources

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.

Authors

I am an author on this paper
Click your name to claim this paper and add it to your profile.

Reviews

Primary Rating

4.7
Not enough ratings

Secondary Ratings

Novelty
-
Significance
-
Scientific rigor
-
Rate this paper

Recommended

No Data Available
No Data Available