Photo-driven TiO2/BC Composites for Efficient Removal of Amoxicillin in Water
In view of the increasingly serious pollution of β-lactam antibiotics in water,TiO2/BC composites were prepared by sol-gel method using alkali-modified biochar(PBC)as precursor,and their photocatalytic degradation performance was used to treat wastewater contaminated by amoxicillin(AMX).The prepared materials were characterized by BET and FTIR.The results showed that the BET specific surface area could be increased by 20.09 times to 110.87 m2/g after TiO2 was loaded.The presence of a large number of oxygen-containing functional groups on the surface of the composite improved its photocatalytic efficiency.Based on the adsorption/degradation experiments,the photocatalytic kinetics of AMX molecules and the degradation mechanism of this process were investigated.The results showed that biochar was an ideal carrier to improve the degradation performance,and the material prepared TiO2/BC composite(TBC2)with PBC and gel ratio of 1∶2 showed better physical and chemical properties.Elovich kinetic model is suitable for simulating the hetero-geneous adsorption process.In the process of TBC2 wastewater treatment,adsorption was the main effect before 2 h,and photocatalytic degradation was the main effect after 2 h.During the photocatalytic degradation process,AMX molecules were adsorbed on the surface and pores of TBC2,which created the favorable conditions for subsequent free radical and non-free radical degradation reactions.TBC2 has good reusability.This study will provide a theoretical basis for the treatment of β-lactam antibiotic wastewater.
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