GO/MoS2电极对Pb^2+的吸附动力学和热力学研究  

Study on kinetics and thermodynamics of adsorption of Pb(Ⅱ)on GO/MoS electrode

作　　者：王一明 黄玮[1] 丛玉凤[1] WANG Yiming;HUANG Wei;CONG Yufeng(College of Chemistry,Chemical Engineering and Environmental Engineering,Liaoning Shihua University,Fushun 113001)

机构地区：[1]辽宁石油化工大学化学化工与环境学部,抚顺113001

出　　处：《分析试验室》2020年第12期1381-1385,共5页Chinese Journal of Analysis Laboratory

基　　金：国家自然科学基金项目(2017Yfc0505901)资助。

摘　　要：制备了一种氧化石墨烯(GO)-二硫化钼(MoS2)复合电极,利用电容去离子法去除水体Pb^2+,并对GO/MoS2电极吸附Pb^2+的动力学和热力学进行了研究。结果表明,在复合GO/MoS2电极材料上,MoS2在GO片层上的生长具有良好的分散性和交错性且分布均匀,避免了MoS2堆叠,增大了利用率;复合后的电极吸附容量明显提高;对GO,MoS2和GO/MoS2电极吸附数据拟合发现,吸附符合准二级动力学方程,说明吸附过程是由液膜扩散和粒子内扩散共同作用;比较Langmuir和Freundlich吸附模型对Pb^2+的吸附行为,Langmuir拟合度更好,说明吸附为单层吸附,理论吸附容量达到7260 mg/g。A composite electrode of molybdenum disulfide(MoS2)and graphene oxide(GO)was prepared for removal of Pb(Ⅱ)from wastewater by capacitive deionization.The kinetics and thermodynamics of adsorption of Pb(Ⅱ)on GO/MoS2 electrode were studied.In our processing,MoS2 nanosheets were growing in well dispersity on GO as the addition of GO preventing the accumulation of MoS2,increasing the surface contact area between the electrode and adsorbate and resulting in high adsorption performance towards Pb(Ⅱ).The adsorption process of GO/MoS2 was fitted to the pseudo-second-order kinetics model,where the diffusion by liquid film and intraparticle was the main adsorption process.Comparing with the Freundlich model,the adsorption behavior of Pb(Ⅱ)was in good correlation with Langmuir isotherm model,which indicating single-layer adsorption to Pb(Ⅱ).The theoretical adsorption capacity of GO/MoS2 towards Pb(Ⅱ)was calculated to 7260 mg/g.

关 键 词：电容去离子 氧化石墨烯 动力学 热力学 

分 类 号：O653[理学—分析化学]