双功能化SBA-15的制备及对水中Ni^(2+)的吸附行为  

Preparation of Dual-functionalized SBA-15 and Adsorption Behavior of Aqueous Nickel

作　　者：魏建文[1] 孟令硕[1] 耿琳琳[1] 王记华[1] 廖雷[1] 

机构地区：[1]桂林理工大学环境科学与工程学院,桂林541004

出　　处：《材料导报》2015年第20期76-80,86,共6页Materials Reports

基　　金：广西教育厅项目(2013YB111);广西环境污染控制理论与技术重点实验室基金(Gui Ke Neng0901z003);广西科技厅科技攻关项目(桂科攻1355003-7);国家自然科学基金(51468011)

摘　　要：分别以硅烷偶联剂和EDTA-2Na为改性剂,采用后嫁接法,制备出双功能化介孔二氧化硅SBA-15。利用傅里叶红外光谱仪、N2吸附-脱附对样品结构进行了表征,并讨论了吸附热力学特性、吸附动力学特性及吸附等温特性。结果表明,双功能化SBA-15吸附水中Ni 2+时在180min内可以达到吸附平衡,吸附过程为化学吸附与物理吸附共存的过程,吸附过程符合拟二级动力学方程,吸附等温线符合Langmuir模型,基于Langmuir模型计算得出35℃时最大吸附量为31.25mg·g-1。Dual-functionalized mesoporous silica SBA-15 was prepared by post-synthesis method taking silane coupling agent and ethylene diamine tetraacetic acid（EDTA-2Na）as modifying agents.Fourier-transform infrared spectroscopy（FT-IR）and N2adsorption-desorption were employed to characterize the adsorbents.Adsorption kinetics and adsorption isotherms were also studied.The adsorption capacity tends to reach equilibrium after 180 min.The results indicated that the pseudo-second-order kinetic model was found to be suited well for the entire adsorption process and it was a chemi-physisorpiton process.Adsorption isotherm of Ni^2＋ with E-NNN-S fitted Langmuir model better.Based on Langmuir model,the maximums adsorption quantity of Ni^2＋ at 35 ℃ was 31.25mg·g^-1.

关 键 词：NI^2+ SBA-15 吸附动力学 LANGMUIR模型 

分 类 号：O643.36[理学—物理化学]