<br>一种 pH 依赖性和电荷选择性共价有机框架，用于从水溶液中去除染料,Journal of Hazardous Materials

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一种 pH 依赖性和电荷选择性共价有机框架，用于从水溶液中去除染料
Journal of Hazardous Materials ( IF 12.2 ) Pub Date : 2024-07-04 , DOI: 10.1016/j.jhazmat.2024.135075
Forouz Rastegari ₁ , Saeid Asghari ₁ , Iraj Mohammadpoor-Baltork ₁ , Hassan Sabzyan ₂ , Shahram Tangestaninejad ₁ , Majid Moghadam ₁ , Valiollah Mirkhani ₁

Affiliation

通过在溶剂热条件下通过 2,4,6-三（4-氨基苯基）−1,3,5-三嗪（TAPT）和 2-羟基-5-甲氧基间苯二甲醛（HMIPA）的缩合合成了一种新型亚胺连接的 COF。在 pH 值为 7 时，该 COF 优先吸附中性染料中性红（NR）而不是带正电荷的染料亚甲蓝（MB），在 pH 值为 3 时，带负电荷的甲基橙（MO）优先于带正电荷的亚甲蓝（MB）。在优化条件下，MB、MO 和 NR 染料在极短时间（11-60 分钟）内获得的最大吸附容量（qe）分别为 108、185 和 429 mg.g-1。这些吸附服从 Langmuir 等温线和准二级动力学。制备的 TAPT-HMIPA-COF 成功用于去除真实水和处理过的废水样品中的染料。吸附数据、BET、FTIR 和 zeta 电位测量表明，静电、π-π 堆叠和氢键相互作用是有机染料吸附在制备的 COF 表面的原因。由于可回收性、高容量和对阳性、阴性和中性有机染料的吸附效率，该 COF 被认为有望在调整的 pH 值下同时从水溶液中去除各种染料。

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A pH-dependent and charge selective covalent organic framework for removal of dyes from aqueous solutions

A novel imine-linked COF is synthesized by the condensation of 2,4,6-tris(4-aminophenyl)−1,3,5-triazine (TAPT) and 2-hydroxy-5-methoxyisophthalaldehyde (HMIPA) under solvothermal conditions. This COF adsorbs preferentially the neutral dye Neutral Red (NR) over the positively charged dye Methylene Blue (MB) at pH 7, and the negatively charged Methyl Orange (MO) over the positively charged Methylene Blue (MB) at pH 3. The maximum adsorption capacities (qe) obtained within very short times (11–60 min) under optimized conditions were 108, 185 and 429 mg.g−1 for the MB, MO, and NR dyes, respectively. These adsorptions obey the Langmuir isotherm and pseudo-second-order kinetics. The prepared TAPT-HMIPA-COF is used successfully for the removal of the dyes from real water and treated wastewater samples. The adsorption data, BET, FTIR, and zeta potential measurements show that the electrostatic, π-π stacking and hydrogen bond interactions are responsible for the adsorption of organic dyes on the surface of the prepared COF. Due to recyclability, high capacity and efficiency for the adsorption of positive, negative and neutral organic dyes, this COF can be considered promising for simultaneous removal of various dyes from aqueous solutions at adjusted pHs.

更新日期：2024-07-04

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