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| Synthesis of Hollow Mesoporous SiO2 and Its Adsorption Performance of CrⅥ |
ZHANG Chen, HAN Weihao, GONG Yumei( ), YU Yang, CAO Jincheng |
| School of Textile and Materials Engineering, Dalian Polytechnic University, Dalian 116034, China |
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Cite this article:
ZHANG Chen, HAN Weihao, GONG Yumei, YU Yang, CAO Jincheng. Synthesis of Hollow Mesoporous SiO2 and Its Adsorption Performance of CrⅥ. Chinese Journal of Materials Research, 2021, 35(1): 45-52.
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Abstract A concise and facile one-pot sol-gel method was proposed by using 3-aminophenol/formaldehyde (AF) resin as soft template, tetraethyl orthosilicate (TEOS) as silicon source, hexadecyl trimethyl ammonium bromide (CTAB) as pore-forming agent for synthesizing silica microparticles. In the synthesis process, modification of soft template 3-aminophenol/formaldehyde (AF) resin structure and hydrolysis rate of TEOS was made by simply changing reaction temperature, a series of SiO2 microspheres with different structures and morphology could be obtained. The microstructure and characteristic of the SiO2 microparticles were characterized by means of scanning electron microscope (SEM), transmission electron microscopy (TEM), N2 adsorption-desorption specific surface areaanalysis (BET) and Fourier transform infrared spectroscopy (FTIR). The results show that as the reaction temperature increases from 0℃to 100℃, SiO2 microparticles presented various type of structures such as solid sphere, yolk-shelled sphere, single-shelled sphere, and broken solid sphere. The HMS microspheres with hollow yolk-shelled morphology possessed a large specific surface area (513 m2/g), large pore volume (0.432 cm3/g), and uniform mesopores (3.66 nm). In addition, the yolk-shelled HMS was subjected to acrylonitrile free radical polymerization, amidoxime treatment to obtain HMS-grafted-polyamidoxime (HMS-g-PAO), which were used in the adsorption test of CrVI in K2Cr2O7 solution at pH=2. The modified HMS microspheres had an excellent adsorption ability to CrVI in K2Cr2O7 solution, and the adsorption amount could reach 140 mg/g when adsorption balanced.
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Received: 25 March 2020
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| Fund: National Natural Science Foundation of China(51773024);Liaoning Provincial Natural Science Foundation Guidance Program Project(2019-ZD-0288);Liaoning Provincial Innovation Team Project(LT2017017) |
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