水合氧化锆吸附剂在电池级硫酸锰溶液中除氟研究  

Study on removal of fluoride by hydrous zirconium oxide adsorbent in battery grade manganese sulfate solution

作　　者：胡慧萍[1] 董和大 彭奇凡 HU Huiping;DONG Heda;PENG Qifan(College of Chemistry and Chemical Engineering,Central South University,Changsha 410083,China;Changsha Huadi Water Treatment Technology Company Limited,Changsha 410083,China)

机构地区：[1]中南大学化学化工学院,湖南长沙410083 [2]长沙华迪水处理技术有限公司,湖南长沙410083

出　　处：《中南大学学报（自然科学版）》2022年第11期4234-4241,共8页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金资助项目(51474256)。

摘　　要：采用沉淀法制备水合氧化锆吸附剂,研究水合氧化锆吸附模拟硫酸锰溶液中氟离子的性能。考察不同实验条件下水合氧化锆对氟的吸附效果的影响,并利用扫描电子显微镜(SEM)、傅里叶变换红外光谱(FT-IR)、X射线光电子能谱(XPS)手段对吸附剂吸附前、后的形貌进行表征及对吸附机理进行分析。研究结果表明:在含锰90.39 g/L、氟50 mg/L的硫酸锰溶液中,水合氧化锆最佳吸附条件为pH=4.0,吸附剂用量为2 g/L,吸附时间为8 h,在吸附温度为20℃时,吸附后溶液中残留氟质量浓度为8.54 mg/L,锰损失与溶液中锆残留量均很低。实验数据与拟二级动力学模型及Freundlich吸附等温模型所得结果高度拟合。升温有利于吸附,35℃下理论最大平衡吸附容量为77.64 mg/g。氟离子通过与吸附剂上羟基发生离子交换而被去除。水合氧化锆是适用于电池级硫酸锰溶液中氟吸附脱除的有效材料。The hydrous zirconium oxide adsorbent was prepared by precipitation method, and the adsorption performance of hydrated zirconium oxide on fluoride in simulated manganese sulfate solution was studied. The effect of hydrated zirconium oxide on the adsorption of fluoride at different experimental conditions was investigated, the morphology of adsorbent before or after fluoride adsorption was characterized by scanning electron microscopy(SEM), Fourier transformed infrared spectroscopy(FT-IR) and X-ray photoelectron spectroscopy(XPS), and the adsorption mechanism was also analyzed. The results show that the optimal adsorption conditions of hydrous zirconium oxide in manganese sulfate solution(manganese concentration is 90.39 g/L, fluoride concentration is 50 mg/L) are as follows: pH=4.0, dose of adsorbent is 2 g/L, adsorption time is 8 h, and the final fluoride mass concentration is 8.54 mg/L. Both manganese loss and zirconium residue in solution are extremely low when the adsorption temperature is 20 ℃. The experimental data is highly consistent with that of the pseudo-second-order kinetic model and the Freundlich adsorption isotherm model. The adsorption process is endothermic and the theoretical maximum equilibrium adsorption capacity is 77.64 mg/g. The fluoride is removed by ion exchange reactions between surface hydroxyl groups with fluoride. The hydrous zirconium oxide adsorbent is an effective material suitable for the removal of fluoride in battery grade manganese sulfate solution.

关 键 词：电池级硫酸锰 除氟 水合氧化锆 机理 

分 类 号：TF792[冶金工程—钢铁冶金]