Research On The Adsorption Performance Of Teracycline By Carboxymethyl Salix Psammophila Powder Membranes

In recent years,the environmental problems and health risks caused by antibiotic pollution in the water environment risks have attracted widespread attention.Adsorption has lots of advantages,it is recognized as a effective antibiotic residue removal method.Carboxymethyl salix psammophila powder(CMS)was prepared using salix psammophila powder(SPP)as raw material.The carboxymethylated salix powder membranes(CMSM)were prepared by CMS dissolved in 1-propyl-3-methy limidazole chloride salt.The effect of various experiment factors on the adsorption capacity of CMS and CMSM were analyzed.The micro-structure morphologies of the CMS and CMSM were characteried by FTIR,XRD,XPS,BET and TG.The surface morphology of CMS and CMSM before and after adsorption was analyzed by SEM.The effects of adsorption conditions on the adsorption of TC on CMS and CMSM were explored.And the adsorption kinetics and adsorption isotherms were defined.The desorption properties of CMS and CMSM were expored by altering the desorption conditions.The main experimental results are shown below:1.Preparation of CMS and the characterizationWhen the concentration of NaOH is 20%,the preparation temperature is 60?,the quality ratio of SPP and chloroacetic acid is 1:1 and the preparation time is 90 min,the maximum adsorption capacity of CMS for TC reaches 190.0 mg/g.The surface of SPP becomes uneven after being modified,and the crystal strcture has been changed.2.The adsorption properties of CMS for TCThe maximum adsorption capacity of CMS for TC reaches 190.0 mg/g.The surface of SPP becomes uneven after being modified,and the crystal strcture has been changed.The adsorption process of CMS for TC keep to the pseudo-second-order kinetic and Freundlich isotherm model,which belongs to the chemical adsorption of multi-molecular layers.The CMS surface becomes loose and porous,and after the adsorption of TC,the surface becomes dense.The desorption efficiency of CMS for is 28%.3.Preparation of CMSM and the adsorption properties of CMSM for TCThe maximum adsorption capacity of CMSM for TC reaches 340.0 mg/g.Compared with CMS,the intensity of infrared absorption peak of CMSM decreased,the crystal strcture has changed,the thermo-stability has improved.The adsorption kinetics of TC on CMSM fits both the pseudo-first-order and pseudo-second-order kinetic models,and satisfies the Freundlich isotherm model,which belongs to the multi-molecular layer adsorption by the coexistence of physical and chemical adsorption.The CMSM surface becomes loose and porous,and after the adsorption-of TC,many small particles are attached to the surface of CMSM.The desorption efficiency of CMSM is 20%.