磁性Ce-La-MOFs@Fe<sub>3</sub>O<sub>4</sub>的除氟性能

doi:10.11896/cldb.22080185

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Abstract In the present work, Ce-La-MOFs@F₃O₄ composites were prepared via hydrothermal method, and the adsorption performance of Ce-La-MOFs@Fe₃O₄ on F^- in aqueous solution was investigated, and the adsorption conditions were optimized by response surface method. The experimental results show that the best adsorption effect of Ce-La-MOFs@Fe₃O₄ is achieved at pH=3.6, experimental temperature of 40 ℃, and initial fluoride ion concentration of 17.4 mg/L, and the F^- removal efficiency could reach 94.5%. The experimental datas of fluoride removal were more suitable to be described by Langmuir isotherm model, and the maximum adsorption capacity (q_max) is 147.23 mg/g. The thermodynamic parameters ΔG^o, ΔH^o and ΔS^o indicated that the adsorption reaction is anentropy-increasing process with spontaneous heat absorption, and kinetic study show that the adsorption of F^- by Ce-La-MOFs@Fe₃O₄is well fitted with the pseudo second order model. The morphology and structure of the composites were characterized and analyzed, and the adsorption mechanisms were explored in conjunction with the adsorption thermodynamic and kinetic studies, which were mainly a combination of ion-exchange action and electrostatic adsorption. The results of co-existing ion experiments and regeneration experiments show that Ce-La-MOFs@Fe₃O₄ has ahigh selectivity for F^-. And the regeneration perfor-mance of Ce-La-MOFs@Fe₃O₄ is so excellent that the recovery rate can reach 96%. After two cycles, the removal efficiency still reached 81.74% of F^-.

Key words： magnetic Ce-La-MOFs@Fe₃O₄ defluoridation adsorption response surface optimization

Published: 25 February 2024 Online: 2024-03-01

CLC number:

X52

Fund:National Natural Science Foundation of China (61903288), Natural Science Foundation of Fujian Province (2019J01829, 2019J01830), Fujian Province Education Department Program (FBJG20210043), Nanping Science and Technology Project (2022-ZXHZ-002,N2020Z015), Wuyi University Faculty and Students Create Research Team Project (2020-SSTD-05).

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	Articles by authors
	SONG Jiangyan
	ZHAI Tao
	WEN Qian
	ZHOU Rongrong
	YANG Weisen
	JIAN Shaoju
	PAN Wenbin
	HU Jiapeng

Cite this article:

SONG Jiangyan,ZHAI Tao,WEN Qian, et al. Defluoridation Performance of Magnetic Ce-La-MOFs@Fe₃O₄[J]. Materials Reports, 2024, 38(4): 22080185-7.

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http://www.mater-rep.com/EN/10.11896/cldb.22080185 OR http://www.mater-rep.com/EN/Y2024/V38/I4/22080185

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