Easily Separated and Recyclable Amino-functionalized PorousSiO2 Beads with 3D Continuous Meso/Macropore Channels

doi:10.1007/s40242-018-7208-0

Chemical Research in Chinese Universities ›› 2018, Vol. 34 ›› Issue (1): 13-18.doi: 10.1007/s40242-018-7208-0

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Easily Separated and Recyclable Amino-functionalized PorousSiO₂ Beads with 3D Continuous Meso/Macropore Channels

WANG Qi¹, YANG Xiaohui¹, JIANG Yanqiu¹, HUO Hang¹, LI Defeng¹, LIN Kaifeng^1,2, XU Xianzhu¹

1. MⅡT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150090, P. R. China;
2. Key Laboratory of Advanced Energy Materials Chemistry, Ministry of Education, Nankai University, Tianjin 300071, P. R. China

Received:2017-06-12 Online:2018-02-01 Published:2018-01-20
Contact: JIANG Yanqiu,E-mail:jiangyanqiu@hit.edu.cn;XU Xianzhu,E-mail:xuxianzhu@hit.edu.cn E-mail:jiangyanqiu@hit.edu.cn;xuxianzhu@hit.edu.cn
Supported by:
Supported by the National Natural Science Foundation of China(No.51472062) and the Opening Project of the Key Laboratory of Polyoxometalate Science of Ministry of Education, China.

Abstract

Abstract: Amino-functionalized porous SiO₂ beads with a diameter of 200—800 μm(PSB-NH₂) have been successfully synthesized by grafting 3-aminopropyl-triethoxysilane onto meso/macroporous silica beads(PSB), in which the PSB was prepared by hydrothermal synthetic method with a porous hard template anion-exchange resin. The as-prepared materials were characterized by means of nitrogen sorption and transmission electron micrographs(TEM), showing the presence of 3D interconnected and continuous large mesopores and macropores inside. The beads were used to catalyze Knoevenagel condensation and proved to be highly active and selective due to the high accessibility of the reactants to the amino groups via the continuous 3D meso/macopores. Notably, such material in bead format facilitates the extremely straightforward separation from reaction solution without any centrifugation or filtration. Moreover, PSB-NH₂ proved to be a stable catalyst via leaching experiment test, and can be easily recovered and reused without significant loss of activity in successive catalytic cycles.

Key words: Amino group, Porous SiO₂ bead, Continuous 3D meso/macropore, Knoevenagel condensation, Straightfor-ward separation

WANG Qi, YANG Xiaohui, JIANG Yanqiu, HUO Hang, LI Defeng, LIN Kaifeng, XU Xianzhu. Easily Separated and Recyclable Amino-functionalized PorousSiO₂ Beads with 3D Continuous Meso/Macropore Channels[J]. Chemical Research in Chinese Universities, 2018, 34(1): 13-18.

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Easily Separated and Recyclable Amino-functionalized PorousSiO₂ Beads with 3D Continuous Meso/Macropore Channels

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