Study On The Migration Characteristics And Treatment Process Of Sulfonamide Antibiotics

This experiment is divided into two parts.First part,Chinese cabbage,black soil and brown soil were selected to investigate the transfer characteristics and the influence factors of sulfadiazine(SDZ)and sulfamethazine(SMT)in soil-plant system,using leaching experiment and pot experiment.The results showed that the transfer ability of SDZ was higher than SMT in soil.Thetransfer ability of SDZ and SMT was decreased with the increase of soil depth.With leaching time prolonged and the antibiotic concentration increased,the transfer ability of SDZ and SMT was increased in the same soil layer.The transfer ability of sulfonamides can be influenced by different soil types.The transfer ability of SDZ and SMT was higher in brown soil than that in black soil.The absorption and transfer of the sulfonamides in plant was impacted by their transfer ability in soil.Chinese cabbage can uptake more SDZ rather than SMT,and the sulfonamides were mainly detected in the stem and the leaf of the Chinese cabbage.With the antibiotic concentration increasing,the residue concentrations of sulfonamides in Chinese cabbage were increased.The concentrations of SDZ and SMT in Chinese cabbage were higher in brow than in black soil.The second part using the improved Hummers method,wet chemical method to prepare graphene / zero valent iron nano composite material(RGO-NZVI),and then use XRD,XPS,TEM,BET and Zeta potential analysis techniques for characterization of RGO-NZVI composite materials,and composite materials on RGO-NZVI adsorption effect factors of degradation of antibiotics and solid-liquid ratio sulfonyl amine pH,time and effect of a preliminary inquiry.The results provide a theoretical basis and data support for the application of RGO-NZVI composite in the treatment of antibiotic contamination in soil.The results show that the higher the solid-liquid ratio,the more antibiotics adsorption treatment;little antibiotic concentration differences in adsorption process changes in the oscillation time,that was fast adsorption;in the acidic environment more conducive to the adsorption of antibiotics.