Preparation of a covalent organic framework-modified silica-gel composite for the effective adsorption of Pd(II), Zr(IV) and Mo(VI) from nitric acid solution

Hao Wu; Naoki Osawa; Masahiko Kubota; Seong-Yun Kim

doi:10.1007/s44211-024-00666-9

Preparation of a covalent organic framework-modified silica-gel composite for the effective adsorption of Pd(II), Zr(IV) and Mo(VI) from nitric acid solution

Anal Sci. 2024 Dec;40(12):2287-2293. doi: 10.1007/s44211-024-00666-9. Epub 2024 Sep 20.

Authors

Hao Wu¹, Naoki Osawa², Masahiko Kubota², Seong-Yun Kim²

Affiliations

¹ School of Nuclear Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China. sjtuwuhao123@sjtu.edu.cn.
² Department of Quantum Science and Energy Engineering, Graduate School of Engineering, Tohoku University, Sendai, 980-8579, Japan.

PMID: 39300045
DOI: 10.1007/s44211-024-00666-9

Abstract

In this study, a novel covalent organic framework-modified silica-gel composite (Si-COF) was synthesized for the adsorption of palladium [Pd(II)], zirconium [Zr(IV)], and molybdenum [Mo(VI)] from nitric acid solutions and its adsorption behaviors were systemically investigated under the effects of contact time, nitric acid concentration, solution temperature and others. The pseudo-second-order kinetic model governed the adsorption of these metal ions onto the Si-COF composite, and the Langmuir isotherm model well-matched with the experimental data, with maximum adsorption capacities of 0.588, 0.221, and 0.417 mmol/g for Pd(II), Zr(IV) and Mo(VI), respectively. The adsorption of these metal ions was clarified to originate from the interaction with the abundant nitrogenous groups on the Si-COF composite by the X-ray photoelectron spectroscopy (XPS) method.

Keywords: Adsorption; Covalent organic frameworks; Silica-gel; X-ray photoelectron spectroscopy.