Bimetallic MOFs for the effective removal of organic contaminants: Dyes and antibiotics

Colloids and Surfaces C: Environmental Aspects Pub Date : 2025-04-14 DOI:10.1016/j.colsuc.2025.100070

Pamthingla Ragui , Anita Yadav , Shalu Goyal , Swati Rani , Vijay Kumar Goel , Rakesh Kumar Sharma

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Abstract

We report the successful solvothermal synthesis of Iron-Nickel bimetallic MOFs (F:N@BTC) as a heterogeneous catalyst without high-temperature annealing. F:N@BTC demonstrated superior catalytic activity in the removal of Organic Contaminants (OCs) attributed to the synergistic effects of two metals (Fe-Ni), high specific surface area (673 m² g⁻¹), and mesoporous structure. The negatively charged surface of F:N@BTC (zeta potential ∼-30 mV) enhances adsorption, particularly for the cationic OCs. The adsorption capacity (q_e, mg g⁻¹) of F:N@BTC for OCs follows the order: Toluidine Blue (TB, 962) > Rhodamine B (RB, 842) > Ciprofloxacin (CF, 808) > Nalidixic acid (NA, 616) > Rose Bengal (RoB, 595) within 2 hours without using reducing agent. This result indicates the order of higher adsorption capacity towards cationic to anionic surface charge of the OCs. Comparative studies confirm F:N@BTC’s superiority over monometallic analogs (F@BTC, N@BTC). Kinetic analysis reveals the adsorption of OCs on F:N@BTC followed pseudo-second-order kinetics indicating chemisorption with intraparticle diffusion contributing co-operatively. This work highlights the potential of F:N@BTC MOFs as an efficient adsorbent for the wastewater treatment across diverse Organic Contaminants.

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用于有效去除有机污染物：染料和抗生素的双金属mof

我们报道了成功的溶剂热合成铁镍双金属mof （F:N@BTC）作为非均相催化剂，无需高温退火。F:N@BTC在去除有机污染物（OCs）方面表现出优异的催化活性，这是由于两种金属（Fe-Ni）、高比表面积（673 m2 g−1）和介孔结构的协同作用。F:N@BTC的负电荷表面（zeta电位~ -30 mV）增强了吸附，特别是对阳离子oc。F:N@BTC对OCs的吸附量（qe, mg g−1）顺序为：甲苯胺蓝（TB, 962） >； 罗丹明B (RB, 842) >； 环丙沙星（CF, 808） >； 萘啶酸（NA, 616） >； 玫瑰（RoB, 595）在2 h内不使用还原剂。这一结果表明，活性炭对阳离子和阴离子表面电荷的吸附能力依次较高。比较研究证实F:N@BTC优于单金属类似物（F@BTC, N@BTC）。动力学分析表明，OCs在F:N@BTC上的吸附遵循准二级动力学，表明化学吸附与颗粒内扩散共同起作用。这项工作强调了F:N@BTC mof作为一种高效吸附剂的潜力，可以处理各种有机污染物的废水。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Colloids and Surfaces C: Environmental Aspects

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