杨保俊，金耀宗，王上海，王百年

（合肥工业大学 化学与化工学院，安徽 合肥 230009）

DOI：10.13732/j.issn.1008-5548.2023.02.006

收稿日期：2022-08-13，修回日期：2022-08-29，在线出版时间：2023-01-06 12:18。

第一作者简介：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。

通信作者简介：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。

摘要：通过共沉淀法和离子交换法成功制备出不同阴离子插层水滑石(layered double hydroxides, LDHs)并比较吸附性能，筛选出性能最佳的乙酸根插层的Mg₂Al-LDHs。考察乙酸根插层的Mg₂Al-LDHs吸附磷过程的吸附动力学、吸附热力学，通过X-射线衍射仪(XRD)、傅立叶红外变换光谱仪(FTIR)对CO₃^2--Mg₂Al-LDHs前驱体、 Ac--Mg₂Al-LDHs 2种吸附剂吸附前、后样品进行表征。结果表明：Ac^--Mg₂Al-LDHs对磷吸附过程符合准二级动力学模型和Langmuir等温热力学模型，属于自发吸热的单分子层吸附过程。由于CO₃^2--Mg₂Al-LDHs层间碳酸根离子与层板结合过于紧密，磷酸根离子无法将碳酸根离子置换，因此CO₃^2--Mg₂Al-LDHs以表面吸附为主；相较于CO₃^2--Mg₂Al-LDHs, Ac^--Mg₂Al-LDHs样品吸附过程中发生表面吸附和化学吸附，故吸附性能提升明显。

关键词：水滑石；乙酸根；磷酸根；吸附剂

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

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