State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, 15 3rd Ring North East Road, Chaoyang District, Beijing 100029, PR China.
State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, 15 3rd Ring North East Road, Chaoyang District, Beijing 100029, PR China.
J Chromatogr A. 2024 Nov 8;1736:465425. doi: 10.1016/j.chroma.2024.465425. Epub 2024 Oct 6.
Recycling rare earth ions from wastewater is an important task, as rare earth elements have a wide range of applications and can cause harm to the environment if discharged arbitrarily. In this work, a simple and inexpensive hydroxyethylidene diphosphate-based adsorbent (SA@HEDP) for adsorbing lanthanum was designed and fabricated. The adsorbent SA@HEDP with the surface rich in phosphate and hydroxyl functional groups provided active sites for adsorption of lanthanum. Research on adsorption performance was conducted by testing the amount of HEDP added, the amount of adsorbent used, the effect of initial pH of La (III), adsorption time, and temperature. The results showed that the adsorption capacity of the adsorbent was 158.0 mg/g. Adsorption of La (III) in real wastewater was tested, when the initial concentration of La (III) was 319.2 mg/L, it could be basically all recovered through three adsorption processes. SEM, EDS mapping, XPS, FTIR, and Zeta potential were used to characterize and analyze the mechanism, and mass transfer kinetics was used to analyze the adsorption process of the adsorbent for La (III).
从废水中回收稀土离子是一项重要任务，因为稀土元素应用广泛，如果任意排放，会对环境造成危害。在这项工作中，设计并制备了一种简单廉价的基于羟乙基二膦酸的吸附剂（SA@HEDP），用于吸附镧。表面富含磷酸根和羟基官能团的吸附剂 SA@HEDP 为吸附镧提供了活性位点。通过测试添加的 HEDP 量、吸附剂用量、La（III）初始 pH 值的影响、吸附时间和温度，研究了吸附性能。结果表明，该吸附剂的吸附容量为 158.0 mg/g。测试了实际废水中 La（III）的吸附，当 La（III）的初始浓度为 319.2 mg/L 时，经过三次吸附过程，基本可以全部回收。通过 SEM、EDS 图谱、XPS、FTIR 和 Zeta 电位对其进行了表征和分析，并采用质量传递动力学对吸附剂对 La（III）的吸附过程进行了分析。
