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Qiang H, Shi M, Wang F, Xia M. Green synthesis of high N-doped hierarchical porous carbon nanogranules with ultra-high specific surface area and porosity for capacitive deionization. Sep Purif Technol 2022. [DOI: 10.1016/j.seppur.2022.122918] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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Sun W, Li J, Li H, Jin B, Li Z, Zhang T, Zhu X. Mechanistic insights into ball milling enhanced montmorillonite modification with tetramethylammonium for adsorption of gaseous toluene. CHEMOSPHERE 2022; 296:133962. [PMID: 35157885 DOI: 10.1016/j.chemosphere.2022.133962] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/21/2021] [Revised: 01/30/2022] [Accepted: 02/10/2022] [Indexed: 06/14/2023]
Abstract
Montmorillonite is widely used for pollutants adsorption due to its porous structure and low price. However, the low specific surface area and small porosity limit its application in gas adsorption field. In this study, montmorillonite was organically modified using a facile dry ball milling method by tetramethylammonium bromide. The adsorption behaviour of toluene as a model VOC compound on organic montmorillonite was systematically investigated through adsorption breakthrough curves, adsorption kinetics and isotherms. After modification by ball milling, the specific surface area of ball milling with tetramethylammonium bromide for montmorillonite modification (BMTMt) was increased from 20.6 m2/g to 186.4 m2/g, and the microporosity proportion was up to 47%. Dynamic adsorption experiments showed that the best performance of BMTMt for toluene (55.9 mg/g) was 6 times higher than that of original montmorillonite (8.8 mg/g). Compared with the water bath preparation method, ball milling method promoted the intercalation of tetramethylammonium bromide into the layers of montmorillonite, resulting in a higher proportion of micropores. Density functional theory calculations indicated that the interaction between tetramethylammonium bromide and montmorillonite was mainly electrostatic forces, and the enhanced adsorption performance for toluene was mainly through microporous filling. BMTMt was proved to be a promising adsorbent for VOCs removal.
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Affiliation(s)
- Wenrui Sun
- Department of Environmental Science and Engineering, College of Chemical Engineering, Beijing University of Chemical Technology, Beijing, 100029, China
| | - Jie Li
- Department of Environmental Science and Engineering, College of Chemical Engineering, Beijing University of Chemical Technology, Beijing, 100029, China
| | - Hao Li
- Department of Environmental Science and Engineering, College of Chemical Engineering, Beijing University of Chemical Technology, Beijing, 100029, China
| | - Baichuan Jin
- Department of Environmental Science and Engineering, College of Chemical Engineering, Beijing University of Chemical Technology, Beijing, 100029, China
| | - Zhifeng Li
- Department of Environmental Science and Engineering, College of Chemical Engineering, Beijing University of Chemical Technology, Beijing, 100029, China
| | - Tingting Zhang
- Department of Environmental Science and Engineering, College of Chemical Engineering, Beijing University of Chemical Technology, Beijing, 100029, China
| | - Xiaobiao Zhu
- Department of Environmental Science and Engineering, College of Chemical Engineering, Beijing University of Chemical Technology, Beijing, 100029, China.
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