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Removal of fluoride ions from ZnSO4 electrolyte by amorphous porous Al2O3 microfiber clusters: Adsorption performance and mechanism
Hydrometallurgy ( IF 4.7 ) Pub Date : 2020-11-01 , DOI: 10.1016/j.hydromet.2020.105455
Kai Yang , Yifan Li , Zhongliang Tian , Ke Peng , Yanqing Lai

Abstract Amorphous porous Al2O3 microfiber clusters (AP-Al2O3-MCs) are developed by combining hydrothermal and roasting methods, which are applied to remove F− from the ZnSO4 electrolyte. Comprehensive characterization of AP-Al2O3-MCs is performed using X-ray diffraction (XRD), scanning electron microscopy (SEM), Brunauer–Emmett–Teller (BET) analysis, and other techniques. The equilibrium F− removal efficiency and adsorption capacity of AP-Al2O3-MCs are 66.35% and 10.832 mg·g −1, respectively, with an adsorbent dose of 7.0 g·L−1 at 313 K in a pH of 5.0 for 45 min. The isotherm study found that the Langmuir isotherm model fits the experimental data well. The theoretical maximum adsorption capacity of F− is 14.96 mg·g−1. Adsorption kinetics can be more appropriately to described by the pseudo-second-order kinetic model. The thermodynamic data is indicative of spontaneous, exothermic, and entropy-decreasing reaction at 313 K. The defluorination mechanism is proposed, which includes the interaction of F− with Al and O on the surface of the AP-Al2O3-MCs, as well as ion-exchange by -OH groups and F−. The estimated dosage and preparation cost of the AP-Al2O3-MCs show a suitable application potential. As a result, AP-Al2O3-MCs are an ideal adsorbent for the removal of F− from the ZnSO4 electrolyte.

中文翻译:

无定形多孔 Al2O3 微纤维簇从 ZnSO4 电解液中去除氟离子:吸附性能和机理

摘要 通过结合水热和焙烧方法开发了无定形多孔 Al2O3 微纤维簇 (AP-Al2O3-MCs),用于从 ZnSO4 电解液中去除 F−。AP-Al2O3-MCs 的综合表征使用 X 射线衍射 (XRD)、扫描电子显微镜 (SEM)、Brunauer-Emmett-Teller (BET) 分析和其他技术进行。AP-Al2O3-MCs的平衡F-去除效率和吸附容量分别为66.35%和10.832 mg·g -1,吸附剂量为7.0 g·L-1,313 K,pH 5.0,吸附45分钟. 等温线研究发现朗缪尔等温线模型与实验数据吻合较好。F-的理论最大吸附容量为14.96 mg·g-1。吸附动力学更适合用拟二级动力学模型来描述。热力学数据表明在 313 K 时发生自发、放热和熵减反应。 提出了脱氟机制,包括 F− 与 AP-Al2O3-MCs 表面上的 Al 和 O 的相互作用,以及-OH 基团和 F- 进行离子交换。AP-Al2O3-MCs 的估计剂量和制备成本显示出合适的应用潜力。因此,AP-Al2O3-MCs 是从 ZnSO4 电解液中去除 F− 的理想吸附剂。
更新日期:2020-11-01
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