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

IF 1.8 4区化学 Q3 CHEMISTRY, ANALYTICAL Analytical Sciences Pub Date : 2024-09-20 DOI:10.1007/s44211-024-00666-9

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

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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.

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制备共价有机框架修饰的二氧化硅凝胶复合材料，用于有效吸附硝酸溶液中的钯（II）、锆（IV）和钼（VI）。

本研究合成了一种新型共价有机框架修饰的硅胶-凝胶复合材料（Si-COF），用于吸附硝酸溶液中的钯（Pd(II)）、锆（Zr(IV)）和钼（Mo(VI)），并在接触时间、硝酸浓度、溶液温度等因素的影响下对其吸附行为进行了系统研究。钯（II）、锆（IV）和钼（VI）的最大吸附容量分别为 0.588、0.221 和 0.417 mmol/g。通过 X 射线光电子能谱（XPS）方法，明确了这些金属离子的吸附源于与 Si-COF 复合材料上丰富的含氮基团的相互作用。

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来源期刊

Analytical Sciences 化学-分析化学

CiteScore

2.90

自引率

18.80%

发文量

232

审稿时长

1 months

期刊介绍： Analytical Sciences is an international journal published monthly by The Japan Society for Analytical Chemistry. The journal publishes papers on all aspects of the theory and practice of analytical sciences, including fundamental and applied, inorganic and organic, wet chemical and instrumental methods. This publication is supported in part by the Grant-in-Aid for Publication of Scientific Research Result of the Japanese Ministry of Education, Culture, Sports, Science and Technology.