Synthesis of silica powder with high pore volume by skeleton reinforcement

doi:10.1016/j.cjche.2021.07.026

Chinese Journal of Chemical Engineering ›› 2022, Vol. 42 ›› Issue (2): 219-226.DOI: 10.1016/j.cjche.2021.07.026

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Synthesis of silica powder with high pore volume by skeleton reinforcement

Hongwei Shan¹, Xiaodong Zhou³, Hao Jiang², Yanjie Hu², Haibo Jiang², Chunzhong Li¹

1. Shanghai Engineering Research Center of Hierarchical Nanomaterials, Key Laboratory for Ultrafine Materials of Ministry of Education, School of Chemical Engineering, East China University of Science & Technology, Shanghai 200237, China;
2. School of Materials Science and Engineering, East China University of Science & Technology, Shanghai 200237, China;
3. State Key Laboratory of Chemical Engineering, School of Chemical Engineering, East China University of Science & Technology, Shanghai 200237, China

Received:2020-05-13 Revised:2021-06-07 Online:2022-03-30 Published:2022-02-28
Contact: Haibo Jiang,E-mail:jianghaibo@ecust.edu.cn;Chunzhong Li,E-mail:czli@ecust.edu.cn
Supported by:
This work was financially supported by the National Natural Science Foundation of China (21838003, 91834301, 21878092), the Shanghai Scientific and Technological Innovation Project (18JC₁410600), the Social Development Program of Shanghai (17DZ1200900, 18DZ2252400), and the Innovation Program of Shanghai Municipal Education Commission, and the Fundamental Research Funds for the Central Universities (222201718002).

Synthesis of silica powder with high pore volume by skeleton reinforcement

Hongwei Shan¹, Xiaodong Zhou³, Hao Jiang², Yanjie Hu², Haibo Jiang², Chunzhong Li¹

1. Shanghai Engineering Research Center of Hierarchical Nanomaterials, Key Laboratory for Ultrafine Materials of Ministry of Education, School of Chemical Engineering, East China University of Science & Technology, Shanghai 200237, China;
2. School of Materials Science and Engineering, East China University of Science & Technology, Shanghai 200237, China;
3. State Key Laboratory of Chemical Engineering, School of Chemical Engineering, East China University of Science & Technology, Shanghai 200237, China

通讯作者: Haibo Jiang,E-mail:jianghaibo@ecust.edu.cn;Chunzhong Li,E-mail:czli@ecust.edu.cn
基金资助:
This work was financially supported by the National Natural Science Foundation of China (21838003, 91834301, 21878092), the Shanghai Scientific and Technological Innovation Project (18JC₁410600), the Social Development Program of Shanghai (17DZ1200900, 18DZ2252400), and the Innovation Program of Shanghai Municipal Education Commission, and the Fundamental Research Funds for the Central Universities (222201718002).

Abstract

Abstract: In this paper, a method composed of gelation of basic skeleton (first step) and skeleton reinforcement process (second step) was introduced to synthesize silica powder with high pore volume through the reaction between water glass and sulfuric acid. No organic solvents were involved in the entire preparation process and the final product was collected by spray drying. The effect of concentration of base solution, gelation point pH value and skeleton reinforcement time on the BET specific surface area and pore volume of the prepared silica powder were investigated intensively. The results show that, a basic skeleton with good dispersibility and high porosity was obtained when the concentration of base solution was 0.1 mol·L^-1 and the gelation pH value reached 6.5. Then the basic skeleton grew into a more uniform porous structure after 30 min skeleton reinforcement. Under these optimum conditions, silica powder prepared by skeleton reinforcement method had a BET specific surface area of 358.0 m²·g^-1, and its pore volume reached 2.18 cm³·g^-1, which was much higher than that of prepared by skeleton-free method (1.62 cm³·g^-1) and by direct gelation method (0.31 cm³·g^-1).

Key words: Water glass, Silica powder, High pore volume, Skeleton reinforcement, Spray drying

摘要： In this paper, a method composed of gelation of basic skeleton (first step) and skeleton reinforcement process (second step) was introduced to synthesize silica powder with high pore volume through the reaction between water glass and sulfuric acid. No organic solvents were involved in the entire preparation process and the final product was collected by spray drying. The effect of concentration of base solution, gelation point pH value and skeleton reinforcement time on the BET specific surface area and pore volume of the prepared silica powder were investigated intensively. The results show that, a basic skeleton with good dispersibility and high porosity was obtained when the concentration of base solution was 0.1 mol·L^-1 and the gelation pH value reached 6.5. Then the basic skeleton grew into a more uniform porous structure after 30 min skeleton reinforcement. Under these optimum conditions, silica powder prepared by skeleton reinforcement method had a BET specific surface area of 358.0 m²·g^-1, and its pore volume reached 2.18 cm³·g^-1, which was much higher than that of prepared by skeleton-free method (1.62 cm³·g^-1) and by direct gelation method (0.31 cm³·g^-1).

关键词: Water glass, Silica powder, High pore volume, Skeleton reinforcement, Spray drying

Hongwei Shan, Xiaodong Zhou, Hao Jiang, Yanjie Hu, Haibo Jiang, Chunzhong Li. Synthesis of silica powder with high pore volume by skeleton reinforcement[J]. Chinese Journal of Chemical Engineering, 2022, 42(2): 219-226.

Hongwei Shan, Xiaodong Zhou, Hao Jiang, Yanjie Hu, Haibo Jiang, Chunzhong Li. Synthesis of silica powder with high pore volume by skeleton reinforcement[J]. 中国化学工程学报, 2022, 42(2): 219-226.

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Synthesis of silica powder with high pore volume by skeleton reinforcement

Synthesis of silica powder with high pore volume by skeleton reinforcement

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