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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。
Using γ-mercaptopropyltriethoxysilane on the surface of the silica gel thiolated modification, infrared and Raman spectroscopy showed that the surface of the silica thiolated by silica gel surface hydroxyl and γ-mercaptopropyldiethoxysilane between the chemical bonds Joint implementation. Under the experimental conditions, the adsorption capacity of Rhodamine B on modified silica gel was significantly improved. The adsorption kinetics of rhodamine B on the surface of modified silica gel accorded with quasi-second-order kinetic model. The adsorption isotherm obeyed the Langmuir isotherm and was calculated by isothermal adsorption The change of thermodynamic function indicates that spontaneous and exothermic process of adsorption. Adsorption kinetics, thermodynamics and spectral characterization indicated that the adsorption of rhodamine B on the modified silica gel was mainly due to the chemisorption on the surface of the modified silica gel by means of electrovalence and covalent bonding.