Citation: YANG Han-Pei, YU Mi-Hong, FU Xiao-Fei, WU Jun-Ming. Thiolated Silica Gel: Synthesis and Immobilization of Rhodamine B from Aqueous Solution[J]. Chinese Journal of Inorganic Chemistry, ;2015, (3): 571-579. doi: 10.11862/CJIC.2015.064 shu

Thiolated Silica Gel: Synthesis and Immobilization of Rhodamine B from Aqueous Solution

YANG Han-Pei ^1,2,, ,
YU Mi-Hong ¹ ,
FU Xiao-Fei ¹ ,
WU Jun-Ming ^1,2

1.
1 Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, College of Environment, Hohai University, Nanjing 210098, China;
2.
2 Huaian Research Institute, Hohai University, Huaian, Jiangsu 223002, China

Corresponding author: YANG Han-Pei,
Received Date: 4 October 2014
Available Online: 9 December 2014
Fund Project: 河海大学淮安研究院开放基金(No.1061-51402012) (No.1061-51402012)

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.
- Rhodamine B;silica gel;thiolation;adsorption;mechanism
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