A new 3D Zn(II)‐based MOF with gra topological network as a photocatalyst for antibiotic degradation

化学 单斜晶系 光催化 微型多孔材料 激进的 粉末衍射 热重分析 催化作用 金属有机骨架 反应速率常数 核化学 晶体结构 结晶学 有机化学 动力学 物理 吸附 量子力学
作者
Lei Bao,Mithun Kumar Ghosh,Yao Miao,Liang Cao,Istikhar A. Ansari,Mohd. Muddassir,Tanmay Kumar Ghorai,Jun‐Cheng Jin
出处
期刊:Applied Organometallic Chemistry [Wiley]
卷期号:38 (11) 被引量:4
标识
DOI:10.1002/aoc.7647
摘要

A novel zinc‐based metal–organic framework (Zn‐MOF), designated as [Zn 3 (L)(bpyp) 2 (HCOO) 3 ·2DMF·H 2 O] ( 1 ), was synthesized using 2,5‐bis(pyrid‐4‐yl)pyridine (bpyp), 1,3,5‐benzenetricarboxylic acid (H 3 L), and Zn(CH 3 COO) 2 ·2H 2 O in a DMF solution. Single‐crystal X‐ray diffraction analysis revealed that MOF 1 crystallizes in the monoclinic system with a C2/c space group, featuring a (3,5)‐connected binodal network. The structural integrity and characteristics of MOF 1 were confirmed by Fourier transform infrared (FT‐IR), thermal gravimetric analysis (TGA), powder X‐ray diffraction (PXRD), and Brunauer–Emmett–Teller (BET) analyses, showing type IV isotherms indicative of microporous structures. The photocatalytic efficiency of MOF 1 was evaluated for the degradation of various antibiotics under UV light, with nitrofurantoin (NFT) demonstrating the highest degradation rate of 83.9% at an optimal concentration of 40 ppm and catalyst loading of 5 mg. The degradation process followed a pseudo‐first‐order kinetic model with a rate constant of 0.02492 min −1 . Radical trapping experiments identified superoxide radicals (O 2 ˙ − ) and holes (h + ) as the predominant reactive species, while hydroxyl radicals (˙OH) played a negligible role. Reusability tests over four cycles confirmed the stability and durability of MOF 1 , with consistent photocatalytic performance and unchanged structural morphology as evidenced by PXRD and SEM analyses. The proposed mechanism involves photoinduced electron–hole pair generation, with subsequent formation of reactive oxygen species (ROS) facilitating NFT degradation. This study highlights MOF 1 as a promising photocatalyst for environmental remediation, specifically for the efficient degradation of pharmaceutical contaminants in aquatic systems, providing insights into its structural properties, photocatalytic activity, and underlying degradation mechanisms.
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