摘要
研究了溴化十四烷基吡啶 (MPB)对膨润土吸附萘的增强效应、机理及影响因素 ,试图为有机膨润土在污染环境修复中的应用提供新的技术路线 .结果表明 ,MPB能显著增强膨润土对萘的吸附作用 ,增强效应及机理与MPB浓度有关 .当MPB平衡浓度 (X)在 0～ 1 /1 0CMC之间 ,MPB几乎全部被膨润土吸附 ,对萘产生分配作用 ,其表观分配系数 (K d)随MPB加入量的增大而急剧增大 ;当X在 1 /1 0CMC～ 1CMC之间 ,由于表面活性剂的吸附作用及其单体的增溶作用 ,K d 值则缓慢减小 ;当X大于 1CMC ,由于增加的表面活性剂主要起胶束增溶作用 ,K d 值则急剧减小 .引入了标化表观分配系数 (K oc)探讨萘在表面活性剂 膨润土 水体系中的吸附机理 ,其倒数(1 /K oc)与X呈线性关系 ;由线性斜率和截距可求得Koc、Kmn、Kmc参数 .
The influence of myristylpyridinium bromide (MPB) on sorption behavior of naphthalene into two bentonites in aqueous solution and its mechanism were investigated. The apparent sorption coefficients ( K * d) of naphthalene on two bentonites with surfactant was dependent on MPB equilibrium concentration ( X ). When X was less than 1/10CMC, the K * d value increased rapidly with increasing MPB primary concentration ( X 0) that was mainly contributed to increasing the organic carbon contents ( f oc ) of bentonites for partitioning naphthalene. The K * d value decreased slowly with increasing X 0 when X was intermediate 1/10CMC and 1 CMC, because the adding MPB increased f oc for sorption naphthalene was less than MPB monomer for enhancement solubility of naphthalene. Then The K * d value decreased sharply with increasing X 0 when X was larger than 1 CMC, which resulted from that the addition of MPB only increased micelle concentration for enhancement solubility of naphthalene. The mechanism was explained by apparent partition coefficient normalized by f oc (i. e. K * oc ) for the first time. The relationship of 1/ K * oc and X was linear. The value of K oc 、 K mn and K mc can be calculated from the intercept and slope of the linear, which will provide theoretical gist for organobentonite applied on organic contaminant remediation.
出处
《环境科学》
EI
CAS
CSCD
北大核心
2003年第2期92-96,共5页
Environmental Science
基金
国家自然科学基金重点项目 (40 0 310 10 )
国家杰出青年基金项目 (2 0 12 5 719)
关键词
膨润土
溴化十四烷基吡啶
萘
吸附
增强效应
bentonite
myristylpyridinium bromide
naphthalene
enhanced sorption
