摘要
研究了用聚二甲基二烯丙基氯化铵(PDMDAAC)和十二烷基硫酸钠(SDS)改性凹凸棒石对模拟微污染水溶液中痕量苯并(a)芘的吸附作用。结果表明,在改性凹凸棒石投加量为15g/L、粒径为150μm、反应温度为20℃、反应时间为60min条件下,苯并(a)芘去除率可达98.56%。改性凹凸棒石对苯并(a)芘的吸附等温线呈中凹型,表明吸附过程存在溶剂化效应和分配效应协同作用。
Two types of modified attapulgite adsorbents, the cationic PA and the anioni-cationic PSAs, were prepared by contacting the raw attapulgite with the polydimethy ldiallyl ammonium chloride （PDMDAAC） solution and mixtures of PDMDAAC and sodium dodecyl sulfate （SDS） solutions, respectively. Many batch adsorption runs were conducted to determine the effects of particle size, adsorbent dose, contact time and temperature on adsorption of trace amounts of Bap from water on the raw and modified adsorbents. The organo modifications enhanced both the adsorption rate and the isotherm capacity of the raw adsorbent for Bap; PSA were more effective than PA. Batch adsorption treatment, employing 15 g/L of PSA （mean diameter-150μm） at 20 ℃, removed 98. 56% of Bap in 60 min. The adsorption of Bap on the attapulgite adsorbents exhibited strong partitioning and solvent effects.
出处
《环境污染与防治》
CAS
CSCD
北大核心
2009年第3期70-73,共4页
Environmental Pollution & Control
基金
国家科技部"政府间国际科技合作项目"(No.2004DFB00200)
