磺胺甲恶唑对磷酸盐在纳米碳管上吸附的影响  

The adsorption of phosphorus affected by sulfamethoxazole on carbon nanotubes

作　　者：曹艳贝 张凰[2] 张迪[1] 魏超贤 郭秉林 

机构地区：[1]昆明理工大学环境科学与工程学院,昆明650500 [2]昆明理工大学,云南省食品安全研究院,昆明650500

出　　处：《环境化学》2015年第11期2004-2009,共6页Environmental Chemistry

基　　金：国家自然科学基金(41303093);云南省自然科学基金(2014FB121)资助

摘　　要：在不同p H下,以纳米碳管(CNTs)为模型吸附剂,探讨磺胺甲恶唑(SMX)对磷酸盐吸附的影响机理.结果表明,磷酸盐在羧基化纳米碳管(MC)上的吸附明显受p H的控制,低p H下表现为高吸附,高p H下表现为低吸附,静电作用可能是控制磷酸盐吸附的主要机制;SMX的加入降低了CNTs对磷酸盐的吸附,归因于直接的点位竞争;由于SMX和磷酸盐形态的变化,可以通过电荷中和或排斥,改变磷酸盐与CNTs之间的静电作用,导致在不同p H下SMX表现出对磷酸盐不同的竞争能力.In this study,the effects of sulfamethoxazole（ SMX） on adsorption of phosphorus by carbon nanotubes（ CNTs） were investigated at different p H. The adsorption of phosphorus by carboxylized carbon nanotubes（ MC） was significantly p H-dependent as indentified by the higher adsorption at low p H but lower adsorption at high p H. The electrostatic interactions were proposed to be the dominant mechanism. The adsorption of phosphorus on CNTs decreased due to the competition of SMX. The competitive adsorption was also p H-dependent. The change of phosphorus and SMX speciation with p H led to change of interactions between phosphorus and CNTs due to electrostatic neutralization or repulsion.

关 键 词：磷酸盐 磺胺甲恶唑 纳米碳管 吸附机理 

分 类 号：X131[环境科学与工程—环境科学] O647.3[理学—物理化学]