摘要
以"grafting to"法制备的氧化石墨烯/聚酰胺-胺(GO/PAMAMs)作为吸附剂,研究了Cu(Ⅱ)和Cd(Ⅱ)在GO/PAMAMs上的竞争吸附行为,考察了溶液pH值、吸附时间、初始离子浓度及吸附剂用量等因素对吸附过程的影响,探讨了Cu(Ⅱ)和Cd(Ⅱ)在GO/PAMAMs上的竞争吸附机理。研究表明:GO/PAMAMs对Cu(Ⅱ)的吸附最佳pH值是5.0,Cd(Ⅱ)的最佳pH值为5.5;Cu(Ⅱ)和Cd(Ⅱ)在GO/PAMAMs上的竞争吸附过程符合Lagergren准二级动力学模型,等温吸附过程遵循Langmuir模型;热力学研究表明Cu(Ⅱ)和Cd(Ⅱ)在GO/PAMAMs上的吸附是自发进行的吸热过程,且属于物理吸附。
Graphene oxide / polyamidoamine dendrimers（ GO / PAMAMs） were prepared as adsorbents via a＂grafting to＂method,and the competitive adsorption behavior of Cu（ Ⅱ） and Cd（ Ⅱ） onto the GO/PAMAMs was studied. The effects of such factors as the solution pH,initial metal ion concentration,and adsorbent dosage were investigated,and the competitive adsorption mechanisms of Cu（ Ⅱ） and Cd（ Ⅱ） onto the GO / PAMAMs were also explored. The results indicated that the optimum pH values for the adsorption of Cu（ Ⅱ） and Cd（ Ⅱ）onto GO / PAMAMs were 5. 0 and 5. 5,respectively. The kinetics of the competitive adsorption of Cu（ Ⅱ） and Cd（ Ⅱ） onto GO / PAMAMs could be well described by a pseudo-second-order model,while the adsorption isotherm followed the Langmuir model. The thermodynamic results imply that the competitive adsorption of Cu（ Ⅱ）and Cd（ Ⅱ） is a spontaneous and endothermic physisorption process.
作者
刘芳
贺盛福
张帆
张晨
LIU Fang HE Shengfu ZHANG Fan ZHANG Chen(College of Chemistry and Chemical Engineering, Jishou University, Jishon 416000, China The Collaborative Innovation Center of Manganese-Zinc-Vanadium Industrial Technology （the 2011 Plan of Hunan Province） , Jishou University Jishou 416000, China)
出处
《环境工程学报》
CAS
CSCD
北大核心
2017年第2期892-898,共7页
Chinese Journal of Environmental Engineering
基金
国家自然科学基金资助项目(B061202)
吉首大学化学化工类专业校外实践基地开放项目(2014jdxm06)
湖南省教育厅重点项目(15A150)
