环境工程学报2012，Vol.6Issue(9)：3131-3136,6.
弱碱性树脂吸附-解吸苦味酸
Adsorption-desorption of picric acid by weaky basic resin
摘要
Abstract
The adsorption and desorption of aqueous picric acid solution onto D301R weaky basic anion exchange resin were investigated.The kinetics,thermodynamics and adsorption mechanism were also studied.The results showed that the maximum adsorption ability of resin occured at pH = 2.7 - 10.2.The adsorption of picric acid on the resin obeyed Freundlich isotherm and was a spontaneous,endothermal and entropy increasing process.Kinetic analysis shows that the adsorption reaction could be approximated by a Lagergren pseudo-second-order-rate equation for which the intraparticle diffusion is the rate-controlling process with an adsorption rate constant of 7.23×10-5 - 1.20×10-4 g/（mg·min） and activity energy of 19.4 kJ/mol.Washout rate of 99% of the picric acid adsorbed on the resin can be eluted with a HNO3 ＋ acetone solution quantitatively.The comparison of static adsorption and desorption confirmed the presence of irreversible chemical adsorption in the adsorption process.The synergistic interactions by the electrostatic,acid-base complex and hydrogen bonding were the main driving forces of picric acid adsorption on the weaky basic resin.关键词
苦味酸/弱碱性树脂/吸附热力学/动力学/解吸Key words
picric acid/weaky basic resin/adsorption thermodynamics/kinetics/desorption分类
资源环境引用本文复制引用
谢祖芳,童张法,陈渊,庞起,黄艳,何雪玲..弱碱性树脂吸附-解吸苦味酸[J].环境工程学报,2012,6(9):3131-3136,6.基金项目
广西自然科学基金资助项目 （）
