有机膨润土在Pb^(2+)和p-硝基苯酚复合污染中的吸附及机理

Adsorption Behavior and Mechanisms in Dual-solutes of Pb ^(2+) and p-Nitrophenol by Organobentonites

以Pb2 + 、p 硝基苯酚为代表污染物 ,用实验室模拟法研究了有机膨润土在重金属 有机物混合污染体系中的吸附行为 .结果表明 ,在有机膨润土 /Pb2 + /p 硝基苯酚体系中 ,溶液中共存Pb2 + 会延缓 p 硝基苯酚在有机膨润土上的吸附速率 ;Pb2 + 与p 硝基苯酚产生竞争吸附 ,竞争作用的大小与溶液中 p 硝基苯酚和Pb2 + 的浓度比c(酚 /Pb)以及有机膨润土对污染物的吸附机制有关 ,相对于吸附机制以分配作用为主的 10 0CTMAB 膨润土 ,Pb2 + 与 p 硝基苯酚在以表面吸附为主的 10 0TMAB 膨润土上的竞争吸附更强 .

The sorption behavior for organobentonites to sorb organic pollutants from metal-organic pollutant systems were investigated.The results suggested that in organobentonite/Pb 2+/p-nitrophenol solute systems,Pb 2+ can slow the sorption velocity of organobentonite to adsorb p\|nitrophenol from water.Pb 2+ and p-nitriphenol exhibit a competitive effect.The competitive effects were relevant to ration of p-nitrophenol and Pb 2+ and adsorption mechanisms of organobentonites.Bentonite modified with TMAB adsorbing contaminants primarily by a adsorption process,and the process exhibits a stonger competitive effect in multi-solute systemms.