Degradation of tetracycline in water by biochar-based rice husk and persulfate
Biochar(BC)was prepared from rice husk and characterized by means of FTIR and XRD tech-nologies.The removal effect and mechanism of tetracycline by biochar-persulfate(BC/PS)system were studied in detail and the kinetics of the degradation was also investigated further.The results indicated that the prepared biochar exhibits good activation performance and synergy effects to persulfate(PS),which can effectively remove tetracycline in water.The removal of tetracycline by BC/PS is significantly higher than that of single BC,PS and C/PS systems.The optimum degradation conditions of tetracycline by BC/PS in concentration of 10 mg/L in 100 mL solution were found to be at the reaction temperature of 60 ℃,the reaction time of 120 min,initial solution pH with value of 5.5,biochar dosage of 3 g/L and persulfate dosage of 12 mmol/L.The removal rate of tetracycline could reach 93.9％under the optimum degradation conditions.The prepared biochar-based rice husk was confirmed to be rich in surface hydrox-yl,carboxyl groups,and other oxygen-containing functional groups via FTIR characterizing,which could activate persulfate to make more sulfate radicals.In addition,the research has demonstrated that several anions that coexisted in water exhibit different degrees of inhibition to the degradation.Kinetic analysis in-dicated that the degradation was well described by the first-order kinetic model and the free radical quenching experiment confirmed that the dominant free radicals in the reaction process are sulfate radicals generated by persulfate ions.
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