Using dimethylaminoethyl methacrylate as the monomer and trimethylolpropane trimethacrylate as the crosslinking agent,tertiary amine resin (TAR) was prepared by suspension polymerization,and then tertiary amine oxide resin (TAOR) was prepared by H2O2 modification.The structures of TAOR were characterized by field emission scanning electron microscopy (SEM),Fourier transform infrared spectroscopy (FT-IR),nitrogen adsorption-desorption isotherms,and thermogravimetric (TG) techniques.Congo Red (CR) was selected as the model pollutant,and the optimal synthesis process of TAOR was optimized and investigated by orthogonal test.The effects of TAOR dosage,solution pH,ionic strength,and coexisting components on the adsorption performance of CR in water were investigated,and the adsorption kinetics during the adsorption process were simulated.The results showed that the adsorption amount of CR decreased with the increase of pH and ionic strength,and the coexisting ions and humic acid had a certain inhibitory effect on the adsorption of CR by the TAOR resin.The adsorption kinetics of CR on TAOR followed to the pseudo second-order kinetic adsorption model,and the Langmuir isotherm model could well describe the adsorption process of CR in solution by TAOR,with a maximum adsorption capacity of 101.9mg/g (at pH 6.0 and 25℃).Thermodynamic results indicated that the adsorption of CR on TAOR was a spontaneous physical adsorption process,with monolayer chemisorption as the controlling mechanism.The combined results of FT-IR and X-ray photoelectron spectroscopy (XPS) further showed that the amine oxide structure on TAOR was involved in the adsorption of CR.Desorption and regeneration experiments revealed that the TAOR resin had the best desorption effect in 1.0mol/L NaOH solution,and its adsorption performance didn't decrease significantly after five regeneration cycles.
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基金资助
国家自然科学基金(21976040、21667005、22166007和22166008);广西高等学校高水平创新团队及卓越学者资助计划项目(桂教人[2020]6号);广西科技重大专项(桂科AA18118013)
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