| 硅胶的表面硫醇化改性及对水溶液中罗丹明B的固载 |
| Thiolated Silica Gel: Synthesis and Immobilization of Rhodamine B from Aqueous Solution |
| 作者 | 单位 | E-mail | | 杨汉培 | 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 | yanghanpei@hhu.edu.cn | | 俞咪虹 | 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 | | | 傅小飞 | 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 | | | 吴俊明 | 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 | |
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| 摘要: 运用γ-巯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γ-巯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、热力学及光谱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。 |
| 关键词: 罗丹明B 硅胶 硫醇化 吸附 机制 |
| 基金项目: 河海大学淮安研究院开放基金(No.1061-51402012), 江苏省高校优势学科建设工程资助项目。 |
| Abstract: A thiolated silica gel was obtained by treating the as-prepared pristine silica gel with γ-mercaptopropyltriethoxysilane through an impregnation route. The FTIR and Raman spectroscopy results indicate that the thiolation of silica gel is achieved by attaching γ-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. |
| Keywords: Rhodamine B silica gel thiolation adsorption mechanism |
| 投稿时间：2014-10-04 修订日期：2014-12-09 |
| 摘要点击次数: 1831 |
| 全文下载次数: 1861 |
| 杨汉培,俞咪虹,傅小飞,吴俊明.硅胶的表面硫醇化改性及对水溶液中罗丹明B的固载[J].无机化学学报,2015,31(3):571-579. |
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