| Zhengzhou Institute of Multipurpose Utilization of Mineral Resources, Chinese Academy of Geological Sciences | Host |
| Citation: |
WANG Cheng, YU Jiale, FENG Kai, WANG Lipeng. Hydrothermal Transformation of Natural Clinoptilolite Zeolite to Zeolite Na-P and Its Adsorption Property for Cd ion[J]. Conservation and Utilization of Mineral Resources, 2021, 41(6): 96-102. doi: 10.13779/j.cnki.issn1001-0076.2021.06.011
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Hydrothermal Transformation of Natural Clinoptilolite Zeolite to Zeolite Na-P and Its Adsorption Property for Cd ion
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Abstract
Natural clinoptilolite zeolites from Weichang region, Chengde city, Hebei province were transformed to a zeolite Na-P using hydrothermal method. The as-prepared materials were characterized and analyzed by X-ray diffraction, X-ray photoelectron spectroscopy, gas adsorption instrument, scanning electron microscope and energy spectrum analyzer. The heavy metal ions removal performance was evaluated by Cd2+ ion. The effects of alkali treatment concentration, hydrothermal temperature and time on the structure of natural zeolite were investigated. The composition, structural characteristics and heavy metal ion removal performance of the prepared zeolite Na-P materials were further studied. The results showed that clinoptilolite could be transform to zeolite Na-P with 3 mol/L NaOH solution under the conditions of hydrothermal temperature of 100 ℃ and hydrothermal time of 12 h. The adsorption capacity of the obtained material for Cd2+ was 35.7 mg/g, which was 7 times higher than that of natural zeolite. Its excellent performance was mainly due to low silicon/aluminum ratio and relative higher exchangeable Na ion content.
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Keywords:
- natural clinoptilolite /
- hydrothermal treatment /
- zeolite Na-P /
- Cd2+
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References
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WANG Cheng, YU Jiale, FENG Kai, WANG Lipeng. Hydrothermal Transformation of Natural Clinoptilolite Zeolite to Zeolite Na-P and Its Adsorption Property for Cd ion[J]. Conservation and Utilization of Mineral Resources, 2021, 41(6): 96-102. doi: 10.13779/j.cnki.issn1001-0076.2021.06.011
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Figure 1.
XRD patterns of samples treated by NaOH with different concentrations
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Figure 2.
XRD patterns of samples treated under different hydrothermal temperatures
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Figure 3.
XRD patterns of samples treated under different hydrothermal times
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Figure 4.
XPS spectra (a), surface elements contents and Si/Al ratio (b), Si2p spectra (c), Al2p spectra (d), O1s spectra (e) and Na1s spectra (f)
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Figure 5.
N2 adsorption-desorption curves (a) and pore width distributions (b) of natural zeolite and zeolite Na-P
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Figure 6.
SEM images and EDX spectra of natural zeolite (a, b) and zeolite Na-P (c, d)
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Figure 7.
Adsorption capacity of natural zeolite and zeolite Na-P for Cd2+ under different adsorption times (a) and adsorption isotherms of the samples for Cd2+ under different initial concentrations (b)
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Figure 8.
Plots of pseudo-first-order (a), pseudo-second-order kinetic models (b), Langumir (c) and Freundlich models (d) for adsorption of Cd2+ on natural zeolite and zeolite Na-P
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Figure 9.
Structure schematics of clinoptiloite and hydrothermal transferred zeolite Na-P