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| Adsorption performance and mechanism of carboxyl covalent organic frameworks for Cd（Ⅱ） |
| Received:March 28, 2022 |
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| KeyWord:covalent organic framework（COF）;carboxylic COFs;Cd（Ⅱ）;adsorption |
| Author Name | Affiliation | E-mail | | JIA Hao | College of Resource and Environment, Jilin Agricultural University, Changchun 130000, China
Key Laboratory for Environmental Factors Control of Agro-product Quality Safety, Ministry of Agriculture and Rural Affairs/Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | | | JIANG Hongxin | Key Laboratory for Environmental Factors Control of Agro-product Quality Safety, Ministry of Agriculture and Rural Affairs/Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | | | LI Mingtang | College of Resource and Environment, Jilin Agricultural University, Changchun 130000, China | limtdoc2008@163.com | | LIU Xiaowei | Key Laboratory for Environmental Factors Control of Agro-product Quality Safety, Ministry of Agriculture and Rural Affairs/Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | xwliu2006@163.com |
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| Abstract: |
| To prepare adsorption materials with high adsorption capacities and speeds, two types of covalent organic framework（COF） materials, which were synthesized using a thermal method using TpBD COF was synthesized by 1, 3, 5-triformylphloroglucinol (TP) and benzidine (BD) monomers, and TpBD COOH COF was synthesized by 1,3,5-trialdehyde phloroglucinol（TP）, benzidine（BD）and 4,4′ - diaminobipheny-2, 2′ - dicarboxylic acid（DAA）monomers. The structures and morphologies of the two materials were analyzed by scanning electron microscopy, X-ray diffraction, Fourier transform infrared spectroscopy, and porosity analysis. The Cd（Ⅱ）adsorption properties of these two COFs were compared, and the adsorption kinetics and isothermal adsorption characteristics were analyzed. In addition, the adsorption mechanism was investigated by detecting the TpBD COOH COF before and after adsorption using Zeta potential and X-ray photoelectron spectroscopy. The results showed that the addition of the DAA monomer could successfully modify the COOH functional group on TpBD COF and form a TpBD COOH COF material. The adsorption results showed that the Cd（Ⅱ）adsorption capacities of TpBD COF and TpBD COOH COF were 29.6 mg·g-1 and 142.0 mg·g-1, respectively, demonstrating that the TpBD COOH COF has an enhanced ability to adsorb Cd（Ⅱ）. The adsorption of Cd（Ⅱ）onto the TpBD COOH COF conformed to pseudo-second-order adsorption kinetics and the Langmuir isotherm adsorption equation. Electrostatic adsorption and coordination between the carboxyl groups and Cd（Ⅱ）were the main adsorption mechanisms. Furthermore, the adsorption properties of TpBD COOH COF for Cd（Ⅱ）remained unchanged in practical water samples, demonstrating that it creates a good foreground for the adsorption of Cd（Ⅱ）from a water environment. |
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