SCI和EI收录∣中国化工学会会刊

Chinese Journal of Chemical Engineering ›› 2022, Vol. 47 ›› Issue (7): 155-164.DOI: 10.1016/j.cjche.2021.07.033

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The selective adsorption of rare earth elements by modified coal fly ash based SBA-15

Jinglei Cui, Qian Wang, Jianming Gao, Yanxia Guo, Fangqin Cheng   

  1. State Environmental Protection Key Laboratory of Efficient Resource Utilization Techniques of Coal Waste, Institute of Resources and Environmental Engineering, Shanxi Collaborative Innovation Center of High Value-added Utilization of Coal-related Wastes, Shanxi University, Taiyuan 030006, China
  • Received:2021-03-27 Revised:2021-07-26 Online:2022-08-19 Published:2022-07-28
  • Contact: Jinglei Cui,E-mail:cuijl@sxu.edu.cn;Yanxia Guo,E-mail:guoyx@sxu.edu.cn
  • Supported by:
    The authors gratefully thanks for the National Natural Science Foundation of China (U1810205), Scientific and Technological Innovation Programs of Higher Education Institutions in Shanxi Province (2020L0022), Key Research and Development Program of Shanxi Province (201903D311006).

The selective adsorption of rare earth elements by modified coal fly ash based SBA-15

Jinglei Cui, Qian Wang, Jianming Gao, Yanxia Guo, Fangqin Cheng   

  1. State Environmental Protection Key Laboratory of Efficient Resource Utilization Techniques of Coal Waste, Institute of Resources and Environmental Engineering, Shanxi Collaborative Innovation Center of High Value-added Utilization of Coal-related Wastes, Shanxi University, Taiyuan 030006, China
  • 通讯作者: Jinglei Cui,E-mail:cuijl@sxu.edu.cn;Yanxia Guo,E-mail:guoyx@sxu.edu.cn
  • 基金资助:
    The authors gratefully thanks for the National Natural Science Foundation of China (U1810205), Scientific and Technological Innovation Programs of Higher Education Institutions in Shanxi Province (2020L0022), Key Research and Development Program of Shanxi Province (201903D311006).

Abstract: Rare earth elements (REE) are strategic resources and the recycling of REE in alternative resources is urgent and gets increasingly attention. However, the separation of REE in these alternative resources is still a challenge due to the low concentration of REE and multi coexisted ions in acidic system. In this study, the species distribution of REE within the pH 0-8.0 was calculated. The SBA-15 originated from coal fly ash was modified by two steps with (3-aminopropyl) triethoxysilane (APTES) and diethylenetriaminepentaacetic dianhydride (DTPADA) to obtain DTPADA-SBA-15 adsorbent, which was applied to the selective adsorption of REE. The results showed that DTPADA-SBA-15 possessed excellent adsorption performance on the selective adsorption of REE, including Eu, Gd, Tb, Nd and Sm, in acidic solution (pH 2) with multi competing ions. The FT-IR and Zeta potential characterization verified that the chemical adsorption through the coordination of O in DTPADA-SBA-15 with REE was dominant at lower pH value. The study of adsorption kinetics indicated that the adsorption of rare earth metal ions followed pseudo-second-order kinetic, of which the adsorption process followed the Langmuir isotherm model.

Key words: Rare earth elements, Selective adsorption, SBA-15, Modification

摘要: Rare earth elements (REE) are strategic resources and the recycling of REE in alternative resources is urgent and gets increasingly attention. However, the separation of REE in these alternative resources is still a challenge due to the low concentration of REE and multi coexisted ions in acidic system. In this study, the species distribution of REE within the pH 0-8.0 was calculated. The SBA-15 originated from coal fly ash was modified by two steps with (3-aminopropyl) triethoxysilane (APTES) and diethylenetriaminepentaacetic dianhydride (DTPADA) to obtain DTPADA-SBA-15 adsorbent, which was applied to the selective adsorption of REE. The results showed that DTPADA-SBA-15 possessed excellent adsorption performance on the selective adsorption of REE, including Eu, Gd, Tb, Nd and Sm, in acidic solution (pH 2) with multi competing ions. The FT-IR and Zeta potential characterization verified that the chemical adsorption through the coordination of O in DTPADA-SBA-15 with REE was dominant at lower pH value. The study of adsorption kinetics indicated that the adsorption of rare earth metal ions followed pseudo-second-order kinetic, of which the adsorption process followed the Langmuir isotherm model.

关键词: Rare earth elements, Selective adsorption, SBA-15, Modification