YANG Baojun, JIN Yaozong, WANG Shanghai, WANG Bainian

(College of Chemistry and Chemical Engineering, Hefei University of Technology, Hefei 230009, China)

Abstract：Different anionic intercalated hydrotalides(LDHs) was prepared successfully by coprecipitation and ion exchange methods, the adsorption properties of LDHs was compared, and the best Mg₂Al-LDHs with acetic acid root intercalation was screened out. The adsorption kinetics and thermodynamics of phosphorus adsorption by Mg₂Al-LDHs intercalated with acetic acid was investigated and determined by X-ray diffraction and Fourier transform infrared spectroscopy was used to characterize the samples of CO₃^2--Mg₂Al-LDHs precursor and Ac^--Mg₂Al-LDHs adsorbent before and after adsorption. The results show that the phosphorus adsorption process of Ac^--Mg₂Al-LDHs conforms to the quasi-second-order kinetic model and Langmuir isothermal thermodynamic model, which is a spontaneous endothermic monolayer adsorption process. Because the carbonate ions in the CO₃^2--Mg₂Al-LDHs layer bind to the laminate too tightly, phosphate ions can not replace the carbonate ions the surface adsorption of CO₃^2--Mg₂Al-LDHs is the main method. Compared with CO₃^2--Mg₂Al-LDHs, surface adsorption and chemisorption occur during the adsorption process of Ac^--Mg₂Al-LDHs, the adsorption performance is significantly improved.

Keywords：hydrotalcite; acetic acid root; phosphoric acid root; adsorbent

Received:：2022-08-13，Revised：2022-08-29,Online：2023-01-06 12:18。

First Author：杨保俊(1970—)，男，教授，博士，硕士生导师，研究方向为非金属矿产和大宗城市矿产资源综合利用。E-mail：bj_yang@hfut.edu.cn。

Corresponding Author：王百年(1973—)，男，副教授，博士，硕士生导师，研究方向为非金属矿产和大宗城市矿产资源综合利用。E-mail：284855884@163.com。