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Enhanced removal of tetracycline via advanced oxidation of sodium persulfate and biochar adsorption |
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| Authors: | Zhang Shiqiu Zheng Kui Xu Geng Liang Bolong Yin Qin |
| Institution: | 1.Institute for Carbon Neutrality, Shandong Normal University, Jinan, 250014, Shandong, China ;2.College of Geography and Environment, Shandong Normal University, Jinan, 250014, Shandong, China ;3.National & Local Joint Engineering Research Center of Biomass Resource Utilization, Nankai University, Jinnan District, Tianjin, 300350, China ;4.Analytical and Testing Center, Southwest University of Science and Technology, Mianyang, 621010, Sichuan, China ;5.School of Eco-Environment, Hebei University, Baoding, 071002, Hebei, China ;6.State Key Laboratory of Environmental Criteria and Risk Assessment, Pollution Control Research Center, Chinese Research Academy of Environmental Science, Beijing, 100012, China ;7.College of Water Science, Beijing Normal University, Beijing, 100875, China ; |
| Abstract: | Advanced oxidation of antibiotic tetracycline (TC) is becoming an accessible and efficient technology. The removal of TC from the complex wastewater needs to be lucubrated. In this study, a TC removal system involving degradation and adsorption was established. TC degradation was accomplished by enhanced advanced oxidation via the addition of sodium persulfate (SP) and biochar into simulated wastewater containing Mn2+ and TC wastewater. The adsorption of TC and its derivatives was removed by biochar. The results indicate that the optimized reaction parameters were 3.0 g/L of biochar prepared at 600 °C (B600) and 400 mg/L of SP under acidic condition, and the removal percentage of TC was 87.48%, including 74.23% of degradation and 13.28% of adsorption; the anions Cl?, NO3?, and H2PO4? had negligible effects on the removal of TC in this Mn2+/B600/SP system. The system also functioned well with an aqueous solution with a high chemical oxygen demand (COD) concentration. Electron paramagnetic resonance (EPR) analysis indicated that ·OH and SO4? free radicals were present in the Mn2+/B600/SP system. Based on the testing and analysis results, a removal mechanism and potential TC degradation pathway for this system were proposed. TC can be degraded by ·OH and SO4? via three degradation pathways. Mn2+ can be precipitated as MnO2, and a part of the TC and its derivatives can be adsorbed on the biochar surface. The Mn2+/B600/SP system also performed satisfactorily for a complex aqueous solution with various cations and antibiotics. |
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