Synthesis of ordered mesoporous silica from biomass ash and its application in CO2 adsorption

• Published in: Environmental research Vol. 231; p. 116070
• Main Authors: Xu, Shihai, Zhou, Chuncai, Fang, Hongxia, Zhu, Wenrui, Shi, Jiaqian, Liu, Guijian
• Format: Journal Article
• Language: English
• Published: Elsevier Inc 15.08.2023
• Subjects: Biomass ash; CO2 adsorption; Hydrothermal synthesis; Mesoporous silica; Recycling; Biomass ash; Hydrothermal synthesis; Recycling; CO2 adsorption; Mesoporous silica
• ISSN: 0013-9351; 1096-0953
• DOI: 10.1016/j.envres.2023.116070

It is possible to achieve high-value utilization of solid wastes and lower the cost of mesoporous silica synthesis by synthesizing mesoporous silica from solid wastes. In this study, silica was extracted using the alkali fusion method using biomass ash as the starting material. Biomass ash based mesoporous silica was successfully prepared by hydrothermal method with silicon extract solution as silicon source. The optimum conditions for preparation were determined as follows: addition of cetyltrimethylammonium bromide was 0.45g, hydrothermal temperature was 120 °C, hydrothermal time was 24h. The prepared mesoporous silicon was systematically characterized, and the results showed that high surface area (495 m2/g) and ordered pore structure appeared in the synthesized mesoporous silica materials. The synthesized mesoporous silica showed excellent CO2 adsorption performance (0.749 mmol/g) at 25 °C and 1 bar. According to the calculation of adsorption isotherm and thermodynamics, non-linear Freundlich model can fit the adsorption isotherm better and the adsorption heat of mesoporous silica is less than 20 kJ/mol, which belongs to physical adsorption. After five cycles of CO2 adsorption, the adsorption property was still above 90%, and the CO2/N2 adsorption selectivity reached 396.6, showing good regeneration performance and adsorption selectivity. This research can provide a new possibility for the high-value exploitation of biomass ash and reducing the cost of synthetic mesoporous silica. •Ordered mesoporous silica using biomass ash as precursor was successfully prepared.•The surface area of the prepared mesoporous silica was 495.849 m2/g.•The CO2 adsorption capacity of mesoporous silica reached 0.749 mmol/g.•Excellent CO2 adsorption capacity maintained after five cycles.