| Zhengzhou Institute of Multipurpose Utilization of Mineral Resources, Chinese Academy of Geological Sciences | Host |
| Citation: |
WANG Cheng, LIANG Xinchao, WANG Lipeng, DU Fuling, YU Qianru. Influence of Different Modification Method on the Composition, Structure and Gas Adsorption Property of Natural Clinoptilolite[J]. Conservation and Utilization of Mineral Resources, 2023, 43(4): 89-95. doi: 10.13779/j.cnki.issn1001-0076.2023.04.009
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Influence of Different Modification Method on the Composition, Structure and Gas Adsorption Property of Natural Clinoptilolite
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Abstract
Natural clinoptilolite is one of the natural zeolites with the largest reserves and the most valuable industrial use. However, due to the limitation of its composition and structure, its adsorption property and environmental application effect are not good enough, which limits its large−scale application. Although the above problems can be somehow solved by modifying natural clinoptilolite, the differences in the effects of different modification methods on its composition and adsorption properties are not completely clear at present, and systematic comparative studies are lacking. In this paper, the natural clinoptilolite in Weichang area of Chengde, Hebei Province was studied, and the effects of acid, alkali, hydrothermal and heat treatment on its composition, water vapor, formaldehyde and toluene gas adsorbability were investigated and compared. The results showed that the effects of different modification methods on the composition and gas adsorbability of natural clinoptilolite were quite different. Acid and alkali treatment reduced the crystallinity of clinoptilolite. 400 ℃ heat treatment destroyed the crystal structure of clinoptilolite. Hydrothermal treatment could transform the natural clinoptilolite to analcime and Na−P zeolite. The specific surface area and Si/Al ratio of natural zeolite samples were 13 m2/g and 4.20, respectively, and the adsorption capacities of water vapor, formaldehyde and toluene were 7.5 mg/g, 8.5 mg/g and 7.5 mg/g, respectively. The specific surface areas of acid, alkali, hydrothermal and heat−treated zeolite samples were 147 m2/g, 30 m2/g, 27 m2/g and 11 m2/g, respectively, and the Si/Al ratios were 24.73, 3.85, 2.39 and 4.20, respectively. The adsorption capacities of water vapor were 16.5 mg/g, 8.0 mg/g, 15.0 mg/g and 8.5 mg/g, respectively, and the adsorption capacities of formaldehyde were 27.0 mg/g, 14.5 mg/g, 9.0 mg/g and 7.5 mg/g, respectively. The adsorption capacities of toluene were 26.0 mg/g, 8.5 mg/g, 6.5 mg/g and 5.0 mg/g, respectively. The difference of gas adsorption properties of different modified zeolites was closely related to their specific surface area, pore volume and Si/Al ratio. Acid treated zeolite had relatively higher specific surface area and pore volume, showing excellent gas adsorption performance. This study had a certain promotion effect on the efficient utilization of natural clinoptilolite.
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References
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WANG Cheng, LIANG Xinchao, WANG Lipeng, DU Fuling, YU Qianru. Influence of Different Modification Method on the Composition, Structure and Gas Adsorption Property of Natural Clinoptilolite[J]. Conservation and Utilization of Mineral Resources, 2023, 43(4): 89-95. doi: 10.13779/j.cnki.issn1001-0076.2023.04.009
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Figure 1.
XRD patterns (a) and FTIR spectra (b) of natural zeolite and modified zeolites
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Figure 2.
Particle size distributions (a) and N2 adsorption−desorption isotherm curves (b) of natural zeolite and modified zeolites
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Figure 3.
Schematic for reaction mechanisms of acid and alkali treatments
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Figure 4.
SEM images and EDX spectra of natural zeolite (a,b), acid treated zeolite (c), alkali treated zeolite (d), hydrothermal treated zeolite (e), and heat treated zeolite (f)
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Figure 5.
Water vapor, formaldehyde and toluene adsorption capacities of natural zeolite and modified zeolites