Rastegari Forouz, Asghari Saeid, Mohammadpoor-Baltork Iraj, Sabzyan Hassan, Tangestaninejad Shahram, Moghadam Majid, Mirkhani Valiollah
Department of Chemistry, Catalysis Division, University of Isfahan, Isfahan 81746-73441, Iran.
Department of Chemistry, Catalysis Division, University of Isfahan, Isfahan 81746-73441, Iran.
J Hazard Mater. 2024 Sep 5;476:135075. doi: 10.1016/j.jhazmat.2024.135075. Epub 2024 Jul 4.
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 (q) obtained within very short times (11-60 min) under optimized conditions were 108, 185 and 429 mg.g 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.
通过2,4,6-三（4-氨基苯基）-1,3,5-三嗪（TAPT）与2-羟基-5-甲氧基间苯二甲醛（HMIPA）在溶剂热条件下缩合，合成了一种新型亚胺连接的共价有机框架（COF）。在pH值为7时，该COF对中性染料中性红（NR）的吸附优先于带正电荷的染料亚甲基蓝（MB）；在pH值为3时，对带负电荷的甲基橙（MO）的吸附优先于带正电荷的亚甲基蓝（MB）。在优化条件下，在非常短的时间内（11 - 60分钟）获得的MB、MO和NR染料的最大吸附容量（q）分别为108、185和429 mg/g。这些吸附遵循朗缪尔等温线和伪二级动力学。制备的TAPT - HMIPA - COF成功用于从实际水和处理后的废水样品中去除染料。吸附数据、BET、FTIR和zeta电位测量表明，静电、π-π堆积和氢键相互作用是制备的COF表面吸附有机染料的原因。由于可回收性、对正、负和中性有机染料吸附的高容量和高效率，这种COF有望在调节的pH值下同时从水溶液中去除各种染料。
