Defluoridation Performance of Magnetic Ce-La-MOFs@Fe3O4
SONG Jiangyan1,2, ZHAI Tao2, WEN Qian3, ZHOU Rongrong2, YANG Weisen2, JIAN Shaoju2, PAN Wenbin1, HU Jiapeng2,*
1 College of Environment and Safety Engineering, Fuzhou University, Fuzhou 350001, China 2 Fujian Provincial Key Laboratory of Eco-Industrial Green Technology, College of Ecological and Resources Engineering, Wuyi University, Wuyishan 354300, Fujian, China 3 College of Mathematics and Computer Science, Wuyi University, Wuyishan 354300, Fujian, China
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 (qmax) is 147.23 mg/g. The thermodynamic parameters ΔGo, ΔHo and ΔSo 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-.
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