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Synthesis of silica powder with high pore volume by skeleton reinforcement

Chinese Journal of Chemical Engineering 2022年第2期35卷 219-226页

作者： Hongwei Shan Xiaodong Zhou Hao Jiang Yanjie Hu Haibo Jiang Chunzhong Li Shanghai Engineering Research Center of Hierarchical Nanomaterials Key Laboratory for Ultrafine Materials of Ministry of EducationSchool of Chemical EngineeringEast China University of Science&TechnologyShanghai 200237China School of Materials Science and Engineering East China University of Science&TechnologyShanghai 200237China State Key Laboratory of Chemical Engineering School of Chemical EngineeringEast China University of Science&TechnologyShanghai 200237China

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 *** organic solvents were involved in the entire preparation process and the final product was collected by spray *** effect of concentration of base solution,gelation point p H value and skeleton reinforcement time on the BET specific surface area and pore volume of the prepared silica powder were investigated *** 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 p H value reached *** the basic skeleton grew into a more uniform porous structure after 30 min skeleton *** these optimum conditions,silica powder prepared by skeleton reinforcement method had a BET specific surface area of 358.0 m^(2)·g^(-1),and its pore volume reached 2.18 cm^(3)·g^(-1),which was much higher than that of prepared by skeleton-free method(1.62 cm^(3)·g^(-1))and by direct gelation method(0.31 cm^(3)·g^(-1)).

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

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Low-cost preparation of mesoporous silica with high pore volume

引用

Journal of University of Science and Technology Beijing 2007年第4期14卷 369-372页

作者： Shuling Shen Wei Wu Kai Guo Jianfeng Chen Research Center of the Ministry of Education for high Gravity Engineering and Technology Beijing University of Chemical Technology Beijing China Key Laboratory of the Ministry of Education for Nanomaterials Beijing University of Chemical Technology Beijing 100029 China

Mesoporous silica materials with high pore volume were successfully prepared by the chemical precipitation method, with water glass and a biodegradable nonionic surfactant polyethylene glycol （PEG）. The obtained materials were characterized by transmission electron microscopy （TEM）, scanning electron microscopy （SEM）, thermo gravimetric analyzer and differential scanning calorimetry （TG-DSC）, nitrogen adsorption-desorption measurements, and X-ray diffraction （XRD）. The results showed that the changes of the pore parameters depended on both the surfactant content and heat treatment temperature. When the content of PEG was 10wt% and the obtained PEG/SiO2 composite was heated at 600℃, the mesoporous silica with a pore volume of 2.2 cma/g, a BET specific surface area of 361.55 m^2/g, and a diameter of 2-4 μm could be obtained. The obtained mesoporous silica materials have potential applications in the fields of paint and plastic, as thickening, reinforcing, and flatting agents.

关键词： mesoporous silica chemical precipitation high pore volume water glass nonionic surfactant

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