Synergetic degradation of antibiotics in water by periodate/TiO2 under stimulated solar irradiation
In order to broaden the efficient degradation method of antibiotics in wastewater,the xenon lamp was used as the simulated sunlight(SS)source to activate the periodate(PI),and the water treatment system for antibiotics degradation was set up accordingly.The TiO2 was introduced to the system to improve the degradation effect.At first,sulfadiazine(SDZ)was taken as a representative,the key parameters in PI/TiO2/SS system affecting SDZ degradation were analyzed,which included TiO2 content,PI content,SDZ concentration and initial pH values of the solutions.The results showed that the SDZ degradation rate could reach 95.13％after 30 min treatment at 0.3 mmol·L-1 PI and 0.05 g·L-1 TiO2.The higher PI content,the higher TiO2 dosage,and the lower the SDZ concentration,the higher the degradation rate.The efficient degradation of SDZ in the PI/TiO2/SS system could be achieved in a wide range of solution pH.The UV-Vis spectra and COD removal analysis of SDZ solution during the reaction process proved the synergetic degradation effect of PI/TiO2/SS system.The action rule of·O2-＞IO3·and·OH＞h+in the PI/TiO2/SS system for the SDZ degradation was revealed through the experiments of the H2O2 concentration detection and quenching experiments.In addition,the study investigated and compared the degradation of trimethoprene(TMP),ciprofloxacin(CIP)and enrofloxacin(EFA)solutions before and after TiO2 addition,which proved the universality of PI/TiO2/SS system for the treatment of antibiotic wastewater to some extent.
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