| 贾昊,姜红新,李明堂,刘潇威.羧基共价有机骨架材料对Cd（Ⅱ）的吸附性能及其机理研究[J].农业环境科学学报,2023,42(1):177-187. |
| 羧基共价有机骨架材料对Cd（Ⅱ）的吸附性能及其机理研究 |
| Adsorption performance and mechanism of carboxyl covalent organic frameworks for Cd（Ⅱ） |
| 投稿时间：2022-03-28 |
| DOI：10.11654/jaes.2022-0298 |
| 中文关键词: 共价有机骨架（COFs） 羧基COFs Cd（Ⅱ） 吸附 |
| 英文关键词: covalent organic framework（COF） carboxylic COFs Cd（Ⅱ） adsorption |
| 基金项目:“十四五”国家重点研发计划项目（2021YFD2000202）；中国农业科学院联合攻关重大任务（CAAS-ZDRW202011）；农业农村部环境保护科研监测所基础前沿项目（F321002） |
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| 中文摘要: |
| 为开发对Cd（Ⅱ）具有优异吸附性能的吸附材料，本研究采用溶剂热法制备了共价有机骨架（COFs）材料，使用1，3，5-三醛基间苯三酚（TP）和联苯胺（BD）单体合成TpBD COF，1，3，5-三醛基间苯三酚（TP）、联苯胺（BD）和4，4-二氨基联苯-2，2-二羧酸（DAA）单体合成TpBD COOH COF，采用扫描电镜、X射线衍射仪、傅里叶红外光谱对两种材料的性质进行分析，考察了TpBDCOF和 TpBD COOH COF对 Cd（Ⅱ）的吸附效果，并通过纳米粒度电位仪（Zeta电位）和光电子能谱分析了 TpBD COOH COF对Cd（Ⅱ）的吸附机理。结果表明：添加DAA单体可有效地将羧基（ COOH）官能团修饰到TpBD COF上，形成TpBD COOH COF材料。吸附实验结果显示，当达到吸附平衡时，两种材料对Cd（Ⅱ）的吸附能力大小为TpBD COOH COF（142.0 mg·g-1）>TpBD COF（29.6 mg·g-1）。TpBD COOH COF 对 Cd（Ⅱ）的吸附动力学符合准二级动力学模型，Langmuir吸附模型可以更好地描述 TpBDCOOH COFs 对 Cd（Ⅱ）的吸附过程，TpBD COOH COF 对 Cd（Ⅱ）的吸附机理主要是静电作用和配位作用。在实际水体中，TpBD COOH COF对Cd（Ⅱ）的吸附并未受到明显影响，说明其具有很好环境适应性，在去除水环境中的Cd（Ⅱ）方面具有较好的应用潜力。 |
| 英文摘要: |
| 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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