Co/Cu bimetallic ZIF as New heterogeneous catalyst for reduction of nitroarenes and dyes

Abstract

Nowadays one of the great challenges is to design new bimetallic catalysts with enhanced catalytic activity, selectivity and recycling properties. In this work, the preparation of new Co/Cu bimetallic Zeolitic Imidazolate Framework (Co‐Cu/ZIF) as an efficient catalyst for the reduction of nitro compounds and organic dyes is described. Co‐Cu/ZIF was characterized with different techniques such as SEM, TEM, XRD, XPS, TGA, FT‐IR and UV–vis absorption indicating formation of entirely uniform cubic particles. Using this catalyst, structurally different aromatic nitro compounds were reduced efficiently to corresponding amines in excellent yields. Kinetic studies revealed that the reduction rates of nitrophenol isomers follow 3‐NP > 4‐NP > 2‐NP order. The catalytic activity of Co‐Cu/ZIF was further investigated in the reduction of organic dyes such as methyl orange (MO) and rhodamine B (RhB). This catalyst was recycled for at least ten runs in the reduction of 4‐nitrophenol without a noticeable decrease in activity and reused catalyst was characterized.

Bimetallic CuCo-Zeolitic imidazole frameworks (CuCo-ZIFs): Synthesis and characterization

“…The results demonstrated that the synthesized CuCo-ZIFs had relatively uniform cubic particles. This was consistent the previous result of Gholinejad et al (2020). Moreover, the Brunauer-Emmett-Teller surface areas of CuCo-ZIFs were achieved approximately 1172 m 2 /g, while its Langmuir surfaces areas were achieved approximately 1907 m 2 /g.…”

“…Notably, the position 421.36 cm -1 and 423.97 cm -1 correspondings to ZIF-67 and CuCo-ZIFs were the oscillation position of the metal-N bond. It means that the CuCo-ZIFs material completely achieved the desired crystal structure (Gholinejad et al, 2020).…”

Bimetallic CoCu-ZIF material for efficient visible light photocatalytic fuel denitrification

“…The value of η depends on the optical transition type of the semiconductor photocatalyst, and η = 1 for the systems in our study because ZIF-67 is indirect band gap semiconductor. 45 The introduction of copper changed the sample from purple to blue purple. The approximative band gaps of ZIF-67, Co 8 Cu 2 -ZIF were 1.925 eV and 1.921 eV.…”

Metal–Organic Framework Derived Cobalt Oxide Supported Bimetallic Pd/Cu Nanoparticles for Efficient Catalysis of the Sonogashira Reaction under Aerobic Conditions

“…Copper-free heterogeneous palladium systems for this transformation have also been investigated. 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 Despite the many recent advances in heterogeneous Sonogashira reactions, high loadings of catalysts are required, and there are few examples involving low loadings of catalyst. Therefore, the development of effective heterogeneous catalysts that are active at low loadings in the Sonogashira reactions is highly desirable for realizing green sustainable organic transformations.…”