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环境化学  2015 

水动力与表面活性剂协同作用对双酚A在沉积物上吸附的影响

Keywords: 双酚A,水动力,沉积物,表面活性剂

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Abstract:

选择太湖梅梁湾的表层沉积物作为实验对象,研究了水动力与表面活性剂协同作用下,双酚A吸附行为的变化特征.结果表明,当CTMAB(十六烷基三甲基溴化铵)浓度在1.0倍临界胶束浓度(CMC)以下时,切应力的改变对双酚A在沉积物上的吸附量基本无影响;其吸附量随CTMAB浓度的增大而增大,0.1倍CMC、0.5倍CMC和1.0倍CMC的CTMAB条件下,双酚A的吸附量较0CMC分别增大了0.18倍、0.54倍和0.62倍;相对于Freundich模型,其吸附等温线更符合线性模型.当CTMAB浓度高于CMC时,双酚A在沉积物上的吸附量和吸附平衡时间均随切应力的增加而减小,在切应力和低浓度CTMAB共同作用时,以切应力促进吸附平衡作用为主;而当切应力和高浓度CTMAB共同作用时,以CTMAB的作用为主.水动力和CTMAB共同作用下的双酚A的吸附过程满足准二级吸附动力学方程.

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