Performance and Mechanism for De-Fluorination by Modified Aluminum Hydroxide in Zinc Sulfate Solution
Performance and Mechanism for De-Fluorination by Modified Aluminum Hydroxide in Zinc Sulfate Solution
复制标题
硫酸锌溶液中改性氢氧化铝的脱氟性能及机理
DOI：
10.1166/jnn.2016.12947
复制
发表时间：
2016-12
影响因子：
--
通讯作者：
Wu Jiaona
中科院分区：
文献类型：
--
作者：
Fang Zhao;Xue Ning;Li Linbo;Hong Tao;Kong Hailin;Wu Jiaona
采用静态吸附实验研究了焙烧改性氢氧化铝对氟离子的吸附性能。利用X射线衍射（XRD）和比表面积分析等方法对氢氧化铝的结构和性能进行了表征。研究了吸附剂用量、吸附时间、温度和pH对吸附性能的影响。此外，还研究了吸附除氟过程的吸附模型和动力学机理。结果表明，焙烧改变了氢氧化铝的微观结构，提高了氢氧化铝的吸附能力。在温度40 ° C、pH值4、吸附时间25 min条件下，改性氢氧化铝的吸附容量达到3.68 mg/g。改性氢氧化铝对氟离子的吸附符合Freundlich吸附模型。改性氢氧化铝对氟离子的吸附为外扩散吸附。
Adsorption performance for modified aluminum hydroxide by roasting to fluorine ion was studied by static experiments in this current study. Use of X-ray diffraction (XRD) and specific surface area analysis methods were used to characterize structures and properties of the aluminum hydroxide. The impact of the amount of adsorbent, adsorption time, temperature and pH in adsorption performance were also studied. Moreover, the adsorption model and dynamics mechanism for the de-fluoridation process were also studied. The results showed that the microstructure of aluminum hydroxide was changed and adsorption capacity increased by roasting. The adsorption capacity for the modified aluminum hydroxide reached 3.68 mg/g under following conditions: 40 °C temperature, 4 pH, and 25 min adsorption time. The adsorption of the modified aluminum hydroxide into fluorine ion was conducted by Freundlich adsorption model. The adsorption rate for the fluoride ion on the modified aluminum hydroxide was external diffusion.