Waste coal cinder catalyst enhanced electrocatalytic oxidation and persulfate advanced oxidation for the degradation of sulfadiazine

• Published in: Chemosphere (Oxford) Vol. 303; no. Pt 1; p. 134880
• Main Authors: Bu, Jiaqi, Wan, Qingqing, Deng, Zhiwei, Liu, Hui, Li, Tianhao, Zhou, Chengyun, Zhong, Shian
• Format: Journal Article
• Language: English
• Published: England Elsevier Ltd 01-09-2022
• Subjects: Degradation; Electrocatalytic oxidation; Peroxymonosulfate advanced oxidation; Sulfadiazine; Waste coal cinder; Degradation; Sulfadiazine; Electrocatalytic oxidation; Waste coal cinder; Peroxymonosulfate advanced oxidation
• ISSN: 0045-6535; 1879-1298
• DOI: 10.1016/j.chemosphere.2022.134880

Waste coal cinder, a kind of waste cinder discharged from coal combustion of thermal power plants, industrial and civil boilers, and other equipment, was rich in metal oxides with catalytic activity. In this work, waste coal cinder was used to enhance electrochemical coupling peroxymonosulfate (PMS) advanced oxidation degradation of sulfadiazine (SD). The surface morphology, elemental composition, and electrocatalytic activity of waste coal cinder were characterized by various characterization instruments. The results show that compared with simple electrocatalytic oxidation, electrocatalytic oxidation + waste coal cinder and electrocatalytic coupled persulfate oxidation, electrocatalytic oxidation + PMS advanced oxidation + waste coal cinder has the largest removal efficiency (99.95%) and mineralization rates (90.16%) of SD in 90 min, indicating that the introduction of waste coal cinder greatly increases the degradation efficiency. •OH and SO4−• were detected during the process of degradation. The optimal degradation process parameters were explored through different voltage, pH, plate spacing, aeration flow rate, potassium peroxymonosulfate sulfate complex salt dose, and Na2SO4 dosage. Cycling experiments show waste coal cinder has good structural stability. Through the analysis of triple quadrupole liquid chromatography-mass spectrometry (LC-MS), we put forward three possible ways of SD degradation. This research will provide a novel vision for water treatment.
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•Converting waste coal cinder into high-efficiency catalyst.•Waste coal cinder greatly improves the degradation efficiency of sulfadiazine.•Compared with SO4−.•, •OH has a more obvious degradation effect on sulfadiazine.•The degradation mechanism and process of sulfadiazine were deeply explored.