作者
Yanping Wang,Yanping Wang,Yanping Wang,Qiongyuan Zhang,Qiongyuan Zhang,Qiongyuan Zhang,Kexin Li,Kexin Li,Chunyan Wang,Chunyan Wang,Daqing Fang,Daqing Fang,Daqing Fang,Wei Han,Wei Han,Miao Liu,Miao Liu,Miao Liu,Xiushen Ye,Xiushen Ye,Huifang Zhang,Huifang Zhang,Haining Liu,Haining Liu,Xiaoli Tan,Xiaoli Tan,Zhijian Wu,Zhijian Wu
摘要
Rubidium (Rb) and cesium (Cs) have important applications in highly technical fields. Salt lakes contain huge reserves of Rb and Cs with industrial significance, which can be utilized after extraction. In this study, a composite magnetic adsorbent (Fe3O4@ZIF-8@AMP, AMP = ammonium phosphomolybdate) was prepared and its adsorption properties for Rb+ and Cs+ were studied in simulated and practical brine. The structure of the adsorbent was characterized by SEM, XRD, N2 adsorption–desorption, FT-IR, and vibrating sample magnetometer (VSM). The adsorbent had good adsorption affinity for Rb+ and Cs+. The Langmuir model and pseudo-second-order dynamics described the adsorbing isotherm and kinetic dates, respectively. The adsorption capacity and adsorption rate of Fe3O4@ZIF-8@AMP were increased by 1.86- and 2.5-fold compared with those of powdered crystal AMP, owing to the large specific surface area and high dispersibility of the adsorbent in the solution. The adsorbent was rapidly separated from the solution within 17 s using an applied magnetic field owing to the good magnetic properties. The composite adsorbent selectively adsorbed Rb+ and Cs+ from the practical brine even in the presence of a large number of coexisting ions. The promising adsorbent can be used to extract Rb+ and Cs+ from aqueous solutions.