Photocatalytic?TNTs/WO₃? Coupling Of Ultrasonic Degradation Of Sulfamethazine In Water

Sulfonamides?SAs?are a general term for a class of drugs that have a structure of p-aminobenzene sulfonamide.In recent years,the abuse of SAs has caused great threat to the environment and human health.Traditional sewage treatment methods are difficult to remove SAs from the environment.Advanced Oxidation Technologies?AOPs?degrade antibiotics efficiently and rapidly,and mineralize antibiotics into water,carbon dioxide or biodegradable small molecule acids,for it can produce active free radicals with strong oxidizing power,such as hydroxyl radicals,peroxyl radicals.superoxide radicals and the like.AOPs has gradually replaced the traditional removal method.Photocatalytic technology is a kind of solar energy-based,low-cost,environmentally friendly,and easy-to-operate method for removing antibiotics.At present,TiO2 is the most widely used photocatalyst in the field of photocatalysis.However,TiO2 needs to be modified in practical applications because of its low conversion to visible light.Ultrasonic technology is a clean and efficient advanced oxidation technology for its quick response,mild conditions and wide-range in application.It has a good application prospect in the field of refractory pollutant treatment.Previous researches have shown that ultrasonic/photocatalytic technology can significantly increase the rate of organic degradation.The research is divided into the following sections:Part ?:Using P25 as the precursor,the titanium dioxide nanotubes?TNTs?were prepared by alkali heat method,then the TNTs were combined with WO₃ by hydrothermal method to prepare the high photocatalytic activity catalyst TNTs/WO₃,and the preparation conditions were carried Oout optimized.Part ?:Degradation of Rhodamine B?RhB?with synthetic NTs/WO₃ material were carried out to test its photocatalytic performance.TNTs/WO₃ was used to degrade the actual sulfa antibiotic,sulfamethazine?SMZ?.and the actual degradation effect of TNTs/WO₃ on SMZ was tested.The pH,anion?SO42-,CO₃2-,Cl-?and organic matters?fulvic acid and bovine serum albumin?on the degradation results were explored.The photocatalytic mechanism of TNTS/WO₃ was finally explained.Part III:Using TNTs/WO₃ as photocatalytic material,the degradation effect of SMZ by ultrasonic/photocatalytic technology was discussed,and the ultrasonic power,pH,anion?SO42-,CO₃2-,Cl-?,initial concentration,and organic matters?fulvic acid and bovine serum albumin?were explored.The effect on degradation and its mechanism of influence are explained.Finally the by-product and degradation pathways for SMZ were analyzed.