Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 413, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jhazmat.2021.125381
Keywords
CO2 conversion carbon; Persulfate; 2,4-DCP; Enhanced corrosion; DFT calculations
Categories
Funding
- National Natural Science Foundation of China [21673162, 51325102]
- International Science & Technology Cooperation Program of China [2015DFA90750]
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Carbon dioxide was converted to electrolytic carbon by molten salt electrochemical conversion to prepare an iron-carbon composite for persulfate activation and organic pollutant degradation. The removal efficiency of 2,4-dichlorophenol reached 97.8% with a reaction stoichiometric efficiency of 23.07%, and analysis revealed the active species in the system.
The greenhouse gas carbon dioxide (CO2) was converted to a novel CO2 conversion material (electrolytic carbon, EC) by molten salt electrochemical conversion, which served as the carbon source to prepare an iron-carbon composite (Fe-EC). The composite was used to activate persulfate (PS) and degrade 2,4-dichlorophenol (2,4-DCP) in an aqueous solution. The effects of several essential operating parameters such as PS dosage and pH on 2,4-DCP degradation were investigated. The removal efficiency of 2,4-DCP (20 mg L-1) was 97.8% in the presence of Fe-EC (50 mg L-1) and PS (1 mmol L-1). Moreover, the average % reaction stoichiometric efficiency (RSE) (calculated for all selected times 5-60 min) was maintained at 23.07%. Electron paramagnetic resonance (EPR), classical radical scavenging experiments, and density functional theory (DFT) calculations were integrated for a mechanistic study, which disclosed that the active species in the system were identified as SO4 center dot-, center dot OH, and O-2(center dot-). Moreover, the iron-carbon micro-electrolysis/PS (ICE-PS) system had a high tolerance to a wide range of pH, which would provide theoretical guidance for the treatment of organic pollutants in practical industrial wastewater.
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