Development of Two novel silica based symmetric triazine-ring opening N-donor ligands functional adsorbents for highly efficient separation of palladium from HNO3 solution

Lei Xu; Anyun Zhang; Ning Pu; Chao Xu; Jing Chen

doi:10.1016/j.jhazmat.2019.05.028

Development of Two novel silica based symmetric triazine-ring opening N-donor ligands functional adsorbents for highly efficient separation of palladium from HNO₃ solution

J Hazard Mater. 2019 Aug 15:376:188-199. doi: 10.1016/j.jhazmat.2019.05.028. Epub 2019 May 15.

Authors

Lei Xu¹, Anyun Zhang², Ning Pu³, Chao Xu³, Jing Chen³

Affiliations

¹ College of Chemical and Biological Engineering, Zhejiang University, Hangzhou, 310027, China; Collaborative Innovation Center of Advanced Nuclear Energy Technology, Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing, 100084, China.
² College of Chemical and Biological Engineering, Zhejiang University, Hangzhou, 310027, China. Electronic address: zhangay@zju.edu.cn.
³ Collaborative Innovation Center of Advanced Nuclear Energy Technology, Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing, 100084, China.

PMID: 31128398
DOI: 10.1016/j.jhazmat.2019.05.028

Abstract

The synthesis and characterization of two novel symmetric triazine-ring opening ligands CA-MP (pyridine derivative)/CA-BOPhen (1,10-phenanthroline derivative) functionalized SiO₂-P (P = Polymer) adsorbents for separation of Pd(II) from HNO₃ solutions are presented. SEM, N₂ adsorption/desorption isotherms, TGA and EDS spectroscopy characterization results showed that CA-MP and CA-BOPhen were successfully introduced into the pores of SiO₂-P carrier via physical intermolecular interactions. CA-MP@SiO₂-P and CA-BOPhen@SiO₂-P show high efficiency, high selectivity, extremely fast adsorption rates towards Pd(II) over 19 typical fission or corrosion products in HNO₃ solution. The distribution coefficient K_d values of CA-MP@SiO₂-P and CA-BOPhen@SiO₂-P are up to 206.5 and 205.7 cm³/g, respectively, within 10-15 min of contact time in 0.4 M HNO₃. The adsorption capacities of them to Pd(II) were determined to be 0.36 mmol/g and 0.23 mmol/g, respectively. The fast adsorption rates and high selectivity of two adsorbents towards Pd(II) were related to the formation of the highly preorganized complex [Pd(NO₃)(L)]⁺ (L = CA-MP or CA-BOPhen). These results demonstrate that CA-MP@SiO₂-P and CA-BOPhen@SiO₂-P possess great potential for highly efficient removal of Pd(II) from highly active liquid waste (HLW).

Keywords: Adsorption; HLW; N-donor ligands; Palladium separation; SiO(2)-P.

Publication types

Research Support, Non-U.S. Gov't