环境工程学报2012，Vol.6Issue(2)：398-402,5.
凹凸棒土对腐殖酸的低温吸附性能研究
Adsorption properties of humic acid on attapulgite at low temperatures
摘要
Abstract
Using attapulgite as an adsorbent for adsorption of humic acid from drinking water at low temperatures was studied for the first time.The effects of adsorption time and initial humic acid concentration,adsorbent dosage,pH on the humic acids adsorption onto attapulgite were investigated at 5℃.The related theoretical parameters of adsorption isotherm,kinetics and thermodynamics to research adsorption properties and adsorption mechanisms of attapulgite were determined.The results showed that when temperature is 5℃,pH is 4,the initial concentration of humic acid is 5 mg/L,attapulgite dosage is 15 g/L,contact time is 180 min,humic acid removal rate reaches 97.26%.The humic acid adsorption onto attapulgite accords with Pseudo-second-order model and Freundlich adsorption isotherm,the adsorption process controlled by itraparticle diffusion,is spontaneously endothermic,includes physical adsorption and chemisorption.The maximum theoretical adsorption capacity at 5℃ and pH=7 is 9 mg/g by Freundlich adsorption isotherm fitted curve,which demonstrates that attapulgite has good adsorption effect for treating humic acid-contaminated drinking water at low temperatures.关键词
凹凸棒土/腐殖酸/低温/吸附性能与机理Key words
attapulgite/humic acid/low temperature/adsorption properties and adsorption mechanisms分类
资源环境引用本文复制引用
孙楠,于水利,吴冬冬,衣雪松,王影,徐璐..凹凸棒土对腐殖酸的低温吸附性能研究[J].环境工程学报,2012,6(2):398-402,5.基金项目
国家“十一五”水体污染控制与治理科技重大专项课题 （）
