Characterization and adsorption behaviors of a novel synthesized mesoporous silica coated carbon composite

doi:10.1016/j.cjche.2015.07.014

Chin.J.Chem.Eng. ›› 2016, Vol. 24 ›› Issue (1): 190-195.DOI: 10.1016/j.cjche.2015.07.014

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Characterization and adsorption behaviors of a novel synthesized mesoporous silica coated carbon composite

SaiWang¹, Songsong Xu¹, Chengbao Liu¹, Feng Chen¹, Dongtian Wang¹, Shouqing Liu¹, Zhigang Chen², Zhengying Wu¹

1 Jiangsu Key Laboratory for Environment Functional Materials, School of Chemistry, Biology and Material Engineering, Suzhou University of Science and Technology, Suzhou 215009, China;
2 Department of Clinical Oncology, the Second Affiliated Hospital of Soochow University, Suzhou 215004, China

Received:2014-12-26 Revised:2015-05-24 Online:2016-02-23 Published:2016-01-28
Contact: Zhigang Chen, Zhengying Wu
Supported by:
Supported by the National Natural Science Foundation of China (21103119, 21407111 and 21277094), the Natural Science Foundation of Jiangsu Province (11KJB430012, BK2012167 and BK20140280), the Scientific Research Foundation of the Chinese Ministry of Education ([2013]693), the Excellent Innovation Team in Science and Technology of University in Jiangsu, the Province Collegiate Natural Science Fund of Jiangsu (14KJA430004, 12KJA430005), the Open Projects of the Jiangsu Key Laboratory for Environment Functional Materials (Nos. SJHG1310 and SJHG1304) and the Science, Education and Health Foundation of Soochow (KJXW2013017).

Characterization and adsorption behaviors of a novel synthesized mesoporous silica coated carbon composite

SaiWang¹, Songsong Xu¹, Chengbao Liu¹, Feng Chen¹, Dongtian Wang¹, Shouqing Liu¹, Zhigang Chen², Zhengying Wu¹

1 Jiangsu Key Laboratory for Environment Functional Materials, School of Chemistry, Biology and Material Engineering, Suzhou University of Science and Technology, Suzhou 215009, China;
2 Department of Clinical Oncology, the Second Affiliated Hospital of Soochow University, Suzhou 215004, China

通讯作者: Zhigang Chen, Zhengying Wu
基金资助:
Supported by the National Natural Science Foundation of China (21103119, 21407111 and 21277094), the Natural Science Foundation of Jiangsu Province (11KJB430012, BK2012167 and BK20140280), the Scientific Research Foundation of the Chinese Ministry of Education ([2013]693), the Excellent Innovation Team in Science and Technology of University in Jiangsu, the Province Collegiate Natural Science Fund of Jiangsu (14KJA430004, 12KJA430005), the Open Projects of the Jiangsu Key Laboratory for Environment Functional Materials (Nos. SJHG1310 and SJHG1304) and the Science, Education and Health Foundation of Soochow (KJXW2013017).

Abstract

Abstract: A novel mesoporous silica coated carbon composite (denoted SEG) with hierarchical pore structure has been successfully prepared in an aqueous solution that contains triblock copolymer template, aluminum chloride, siliceous source and expanded graphite. Textural property and morphology of the SEG composite were characterized by the combination of X-ray diffraction, N₂ adsorption-desorption, scanning electron microscopy, transmission electron microscopy and Fourier transform infrared measurements. Results show that mesoporous silica is steadily and uniformly grown on the surface of the graphite slices and the thickness of the silica layer can be finely tuned according to the silica/C molar ratio in the initial reaction solution. This newly synthesized SEG composite shows greatly increased adsorption capacity to methylene blue than the pristine expanded graphite in the batch tests. Both Langmuir and Frendlich models were further used to evaluate the adsorption isotherms of methylene blue over expanded graphite and SEG samples with different silica contents. Finally, pseudosecond-order model was used to describe the kinetics of methylene blue over expanded graphite and the silica-carbon composites.

Key words: Mesoporous silica, Expanded graphite, Composite, Synthesis, Adsorption

摘要： A novel mesoporous silica coated carbon composite (denoted SEG) with hierarchical pore structure has been successfully prepared in an aqueous solution that contains triblock copolymer template, aluminum chloride, siliceous source and expanded graphite. Textural property and morphology of the SEG composite were characterized by the combination of X-ray diffraction, N₂ adsorption-desorption, scanning electron microscopy, transmission electron microscopy and Fourier transform infrared measurements. Results show that mesoporous silica is steadily and uniformly grown on the surface of the graphite slices and the thickness of the silica layer can be finely tuned according to the silica/C molar ratio in the initial reaction solution. This newly synthesized SEG composite shows greatly increased adsorption capacity to methylene blue than the pristine expanded graphite in the batch tests. Both Langmuir and Frendlich models were further used to evaluate the adsorption isotherms of methylene blue over expanded graphite and SEG samples with different silica contents. Finally, pseudosecond-order model was used to describe the kinetics of methylene blue over expanded graphite and the silica-carbon composites.

关键词: Mesoporous silica, Expanded graphite, Composite, Synthesis, Adsorption

SaiWang, Songsong Xu, Chengbao Liu, Feng Chen, Dongtian Wang, Shouqing Liu, Zhigang Chen, Zhengying Wu. Characterization and adsorption behaviors of a novel synthesized mesoporous silica coated carbon composite[J]. Chin.J.Chem.Eng., 2016, 24(1): 190-195.

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Characterization and adsorption behaviors of a novel synthesized mesoporous silica coated carbon composite

Characterization and adsorption behaviors of a novel synthesized mesoporous silica coated carbon composite

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