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Preparation of Calcined Calcium Aluminum Hydrotalcite and Its Adsorption Performance for Fluorine
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Jiajun XIAO, Xiangbing SHEN, Conghua ZHANG, Yuhong WEI, Shangquan PENG, Wenbin YAN
Mining and Metallurgical Engineering | 2023, 43(4) : 131 - 134
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Mining and Metallurgical Engineering | 2023, 43(4): 131-134
• METALLURGY •
Preparation of Calcined Calcium Aluminum Hydrotalcite and Its Adsorption Performance for Fluorine
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Jiajun XIAO, Xiangbing SHEN, Conghua ZHANG, Yuhong WEI, Shangquan PENG, Wenbin YAN
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  • College of Chemistry and Chemical Engineering, Jishou University, Jishou 416000, Hunan, China
Published: 2023-08-01 doi: 10.3969/j.issn.0253-6099.2023.04.028
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With Ca (NO3)2·4H2O and Al (NO3)3·9H2O as raw materials and urea as precipitant, a precursor Ca-Al-LDHs was prepared by microwave heating and hydrothermal synthesis. A product of Ca-Al hydrotalcite (Ca-Al-LDOs) was obtained after roasting, and it was used to adsorb fluorine in wastewater. It is found that Ca-Al-LDOs are of typical layered structure similar to hydrotalcite. With pH of 2, initial concentration of F- ion at 500 mg/g, adsorbent dosage of 2.5 g/L and reaction time of 180 min, the adsorption capacity reaches 173.9 mg/g and the removal rate of fluorine reaches 92.01%. It is found that the process of adsorption conforms to the Freundlich adsorption isotherm mode, and its kinetics conforms to the quasi-second-order kinetic model. The adsorbent Ca-Al-LDOs can be reused after desorption, with defluorination rate keeping at 68.92% after 8 cycles of regeneration.

Ca-Al hydrotalcite  /  fluoride  /  hydrothermal synthesis  /  industrial wastewater  /  wastewater treatment  /  adsorbent  /  fluorine
Jiajun XIAO, Xiangbing SHEN, Conghua ZHANG, Yuhong WEI, Shangquan PENG, Wenbin YAN. Preparation of Calcined Calcium Aluminum Hydrotalcite and Its Adsorption Performance for Fluorine[J]. Mining and Metallurgical Engineering, 2023 , 43 (4) : 131 -134 . DOI: 10.3969/j.issn.0253-6099.2023.04.028
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doi: 10.3969/j.issn.0253-6099.2023.04.028
  • Receive Date：2023-02-28
  • Online Date：2026-03-05
  • Published：2023-08-01
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  • Received：2023-02-28
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    College of Chemistry and Chemical Engineering, Jishou University, Jishou 416000, Hunan, China
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表12种不同金属材料的力学参数
科
Family		 属数
Number of
genus		 种数
Number of
species		 占总种数比例
Percentage of
total species (%)		 属
Genus		 种数
Number of
species		 占总种数比例
Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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