第31卷第3期 2015年3月
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CHINESE JOURNAL OFINORGANIC CHEMISTRY
硅胶的表面硫醇化改性及对水溶液中罗丹明B的固载
杨汉培*,12俞咪虹1傅小飞1吴俊明12
Vol.31 No.3 571-579
1河海大学浅水湖泊综合治理与资源开发教育部重点实验室，河海大学环境学院，南京
210098)
(河海大学淮安研究院，淮安223001)
摘要：运用-疏丙基三乙氧基硅烷对硅胶表面硫醇化修饰改性，红外及拉曼光谱分析表明硅胶的表面硫醇化借助硅胶表面羟基与y-筑丙基二乙氧基硅烷间的化学键联实现。实验条件下改性硅胶对水体罗丹明B的吸附性能明显提升，改性硅胶表面罗丹明B的吸附动力学符合准二级动力学模型，吸附等温线服从Langmuir等温线规律，由等温吸附计算得到的热力学函数变化表明吸附系自发、放热过程。吸附动力学、热力学及光谐表征均表明改性硅胶上罗丹明B的吸附主要为其在改性硅胶表面借助电价和共价键联的化学吸附，
关键调：罗丹明B；硅胶；硫醇化；吸附；机制
中图分类号：0613.71
文献标识码：A
DOI:10.11862/CJIC.2015.064
文章编号：1001-4861(2015)03-0571-09
Thiolated Silica Gel: Synthesis and Immobilization of
Rhodamine Bfrom Aqueous Solution
YANG Han-Pei*12YU Mi-Hong'FU Xiao-Fei'WU Jun-Mingl2('Key Laboratory of Integrated Regulation and Resource Derelopment on Shallote Lakes, Ministry of Education, College of Environment, Hohai University, Nanjing 210098, China)(Huaian Research Institute,Hohai Unirersity,Huaian,Jiangsu 223002, China)
Abstract: A thiolated silica gel was obtained by treating the as-prepared pristine silica gel with -mercaptopropyltriethoxysilane through an impregnation route. The FTIR and Raman spectroscopy results indicate that the thiolation of silica gel is achieved by attaching y-mercaptopropyldiethoxysilane onto the surface of silica gel via a chemical linking. The results for batch removal of Rhodamine B(RhB) from aqueous solution by the thiolated silica gel demonstrate that the thiolated silica gel can effectively adsorb RhB under a wide range of conditions. The data of adsorption kinetics are fitted well with the pseudo-second-order model, and the equilibrium data are well described by the typical Langmuir adsorption isotherm. The thermodynamic derivation shows an exothermic and spontaneous nature of adsorption process with a high value of enthalpy change. The adsorption kinetics, isotherm and thermodynamics suggest a mechanism involving chemisorptions of RhB on
thiolated silica gel as confirmed by FTIR and Raman spectroscopy. Key words: Rhodamine B; silica gel; thiolation; adsorption; mechanism
At present, more than 100 000 types of dyes are used in plastics, paper and pulp, cosmetics, leather,
收稿日期，2014-10-04。收修改稿日期；2014-12-09。
textiles and food industriesl-21, Dyes can be noticed at concentration even as low as 1 mg·L-,which makes
河海大学准安研究院开放基金(No.1061-51402012)，江苏省高校优势学科建设工程资助项目。*通讯联系人。E-mail;yanghanpei@hhu.edu.cn