Journal
CHEMICAL ENGINEERING JOURNAL
Volume 419, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2021.129585
Keywords
Electrophoretic deposition; Biochar electrode; Functionalization; Electro-adsorption; Perchlorate
Categories
Funding
- National Natural Science Foundation of China [51679083]
- Key project of Changsha Science and Technology Plan of China [2004003]
- Research Foundation of Education Bureau of Hunan Province [19K020]
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Functional mesoporous bean dregs-based biochar electrodes were prepared for perchlorate electro-sorption, with 15% ZnO nanoparticle modification recommended for optimal performance. The biochar electrode demonstrated high electrochemical performance and sustainable regeneration capability, making it a reliable method for improving perchlorate electro-sorption.
In this work, functional mesoporous bean dregs-based biochar electrodes were prepared by electrophoretic deposition for perchlorate (ClO4- ) electro-sorption. We characterized the textural and electrochemical properties of the biochar and determined the kinetics of electro-adsorption. The results show that 15% concentration of ZnO nanoparticle modification is recommended to increase the mesoporous volume, specific surface area, hydrophilicity and conductivity of biochar materials. After betaine functionalization, the obtained biochar (BK-Z15%N) possesses an excellent electrochemical performance with high current density, charging capacity, and low ohmic impedance. As expected, it presents an electro-adsorption capacity of 28.31 mg g-1 toward 20 mg L-1 ClO4at 1 V, which is four times higher than that without voltage and much better than other electrodes in this study and most reported data. The electro-adsorption of ClO4- on BK-Z15%-N electrode fits the fractal model, which is a complex process controlled by the electrical force and independent of solution pH. BrO3- and Cl- are the most competitive anion to ClO4- electro-sorption. Notably, it maintains a sustainable electrochemical regeneration ability due to the reversible redox activity of quaternary amine groups. Therefore, this study offers a remarkable and reliable method for improving the electro-sorption performance of perchlorate.
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