Adsorption of Tannic Acid by Quaternary Ammonium Rosin Based Amide Resin and Its Mechanism
Rosin based amide resin(RBR)was prepared by suspension polymerization using hydrogenated rosin ethylene glycol acrylate as monome,and quaternary ammonium rosin based amide resin(QARBR)was prepared by modification of RBR.QARBR was characterized to study its removal performance and adsorption mechanism for the simulated and real systems of tannic acid(TA).The results showed that the specific surface area,pore volume,average pore size,and average particle size of QARBR were 19.21 m2/g,0.13 cm3/g,26.62 nm,and 329 µm,respectively.Under the conditions of TA initial mass concentration of 100 mg/L,a dosage of 3.0 g/L,a temperature of 303 K,a pH value of 7,and an adsorption time of 120 min,QARBR had an adsorption capacity of 28.92 mg/g for TA and a removal rate of 94.60％.After 5 cycles of use,the removal rate of TA by QARBR was 87.62％.The adsorption isotherms and thermodynamic results showed that QARBR adsorption of TA was a spontaneous and exothermic multi-layer adsorption process.The theoretical calculation of quantum chemistry theory calculations showed that TA adsorption by QARBR was mainly achieved through electrostatic attraction between quaternary ammonium groups and phenolic hydroxyl groups.
quaternary ammonium rosin based amide resintannic acidadsorptionquantum chemistry
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