摘要
针对多壁碳纳米管(MWCNTs)对敌草隆的吸附特性进行了研究,并考察了接触时间、温度和初始pH对敌草隆吸附效果的影响。碳纳米管对敌草隆的吸附在1 h内可达到表观平衡,且其吸附动力学曲线符合准二级动力学方程。Polanyi-Manes方程可以准确的描述多壁碳纳米管对敌草隆的吸附行为。通过热力学研究可知,多壁碳纳米管对敌草隆的吸附过程是自发的放热过程。多壁碳纳米管的氧化处理不但可以增加碳纳米管的比表面积和孔容,而且可以在其表面产生多种亲水的含氧官能团。多壁碳纳米管对敌草隆的吸附受pH的影响,在中性和碱性条件下表现出较强的吸附能力。
The performance of diuron adsorption by multiwalled carbon nanotubes（MWCNTs） was investigated in aqueous solutionsto evaluate the effects of contact time,temperature and initial pH on the adsorption of diuron by multiwalled carbon nanotubes.The adsorption of diuron by multiwalled carbon nanotubes reached apparent equilibrium with in 1 h.The pseudo second order adsorption kinetic model well fit the experimental data.The adsorption of diuron by multiwalled carbon nanotubes was well represented by the Polanyi-Manesisotherm.The multiwalled carbon nanotubes adsorption of diuron was a spontaneous and exothermic process.The oxidation of as-prepared multiwalled carbon nanotubes can not onlyincrease the pore volume and the surface area,but also introduce more oxygen-containing functional groups onto the surfaces of MWCNTs,which led to more removal of diuron in this study.pH was a significant effect on diuronad sorption by MWCNTs,and more adsorption was observed under neutral and basic conditions.
出处
《水处理技术》
CAS
CSCD
北大核心
2012年第11期25-29,共5页
Technology of Water Treatment
基金
国家科技重大专项资助(2008ZX07421-002
2008ZX07421-004)
住房和城乡建设部研究项目(2009-K7-4)
