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Ternary 3D/2D/3D direct dual Z-scheme MOF-on-MOF-derived α-Fe2O3/g-C3N4/Fe-MOF photocatalyst for boosted sunlight-driven removal of metronidazole: effect of coexisting ions, mechanistic insights, and water matrices
Environmental Science: Nano ( IF 5.8 ) Pub Date : 2024-09-13 , DOI: 10.1039/d4en00610k
Anindita Bhuyan, Md. Ahmaruzzaman

A direct solid ternary dual Z-scheme photocatalyst, 3D/2D/3D α-Fe2O3/g-C3N4/Fe-MOF (FCM), was fabricated for efficient removal of metronidazole (MTZ) under sunlight irradiation. About 98.5% of 25 mg L−1 MTZ was effectively degraded with a catalyst dosage of 20 mg per 50 mL under 90 min of sunlight irradiation. Moreover, a total organic carbon (TOC) removal of 78.5% was achieved within the same duration under optimal conditions. The simultaneous transfer of photogenerated electron–hole pairs in the two Z-scheme pathways described here can significantly accelerate the charge separation and enhance ROS production. The effect of catalyst dose, initial MTZ concentration, inorganic cations (Na+, Mg2+, Ca2+, and Al3+), inorganic anions (Cl, CO32−, NO3, and SO42−), organic compounds (SDS, urea, HA, and acetone), and different water matrices on the degradation of MTZ by FCM was analyzed systematically. Furthermore, comprehending the spatial separation and transfer of photogenerated charge carriers as well as the formation of ROS at the heterojunction interface is critical for understanding the photocatalytic degradation mechanisms. Consequently, a plausible MTZ breakdown route and charge transfer pathway were established based on the radical scavenging experiments, ESR and LCMS analysis. A high degradation efficiency of the dual Z-scheme MOF-on-MOF-derived 3D/2D/3D α-Fe2O3/g-C3N4/Fe-MOF photocatalyst under all simulated experiments and different water matrices highlights its excellent photoactivity and establishes its potential use in visible-light-driven photocatalytic application in wastewater remediation.

中文翻译:


三元 3D/2D/3D 直接双 Z 型 MOF-on-MOF 衍生的 α-Fe2O3/g-C3N4/Fe-MOF 光催化剂,用于增强阳光驱动的甲硝唑去除:共存离子、机理见解和水基质的影响



制备了直接固体三元双Z型光催化剂3D/2D/3D α-Fe 2 O 3 /gC 3 N 4 /Fe-MOF (FCM),用于在阳光照射下有效去除甲硝唑(MTZ)。当催化剂用量为20 mg/50 mL时,在太阳光照射90 min下,25 mg L -1 MTZ的约98.5%被有效降解。此外,在最佳条件下,相同时间内总有机碳 (TOC) 去除率达到 78.5%。这里描述的两个 Z 方案路径中光生电子空穴对的同时转移可以显着加速电荷分离并增强 ROS 产生。催化剂剂量、MTZ初始浓度、无机阳离子(Na + 、Mg 2+ 、Ca 2+和 Al 3+ )、无机阴离子(Cl 、CO 3 2− 、NO 3 和 SO 4 2− )的影响)、有机化合物(SDS、尿素、HA 和丙酮)和不同的水基质对 FCM 降解 MTZ 的影响进行了系统分析。此外,理解光生电荷载流子的空间分离和转移以及异质结界面处ROS的形成对于理解光催化降解机制至关重要。 因此,基于自由基清除实验、ESR和LCMS分析,建立了合理的MTZ分解路径和电荷转移路径。双Z型MOF-on-MOF衍生的3D/2D/3D α-Fe 2 O 3 /gC 3 N 4 /Fe-MOF光催化剂在所有模拟实验和不同水基质下的高降解效率凸显了其优异的光活性并确定了其在废水修复中可见光驱动的光催化应用中的潜在用途。
更新日期:2024-09-13
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