Preparation of magnetically separable Cu6/7Co1/7Fe2O4–graphene catalyst and its application in selective reduction of nitroarenes

Zhang, Haiyan; Zhao, Ying; Liu, Weihua; Gao, Shutao; Shang, Ningzhao; Wang, Chun

doi:10.1016/j.catcom.2014.10.016

Cited by 52 publications

(17 citation statements)

References 34 publications

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“…Ag NPs have been generally used as excellent catalysts with high catalytic activity and selectivity for catalytic reduction or degradation of organic pollution in aqueous solution [38,39,46,49]. Many reports are available on the application of metal and metal oxides nanocatalysts for the reduction of Figure 4B, the CuFe 2 O 4 /CNC@Ag@ZIF-8 nanocomposites were well dispersed in water and presented a black suspension.…”

Section: Catalytic Reduction Of 4-nitrophenolmentioning

confidence: 99%

“…Compared with CuFe 2 O 4 /CNC@Ag, CuFe 2 O 4 /CNC@Ag@ZIF-8 nanocomposites had a distinct core-shell structure; the thickness of ZIF-8 shell surrounding the CuFe 2 O 4 /CNC@Ag was approximately 45 nm, and there was a controllable particle diameter ranging from 350 to 400 nm. Figure 1F displays [39] and the (111) plane of Ag, respectively [40]. illustrated in Scheme 1, which mainly involved three steps: (1) Firstly, one-pot solvothermal synthesis of cellulose nanocrystals supports CuFe2O4 NPs, and the network of cellulose nanocrystals can significantly enhance the dispersion stability.…”

Section: Introductionmentioning

confidence: 99%

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Preparation of Magnetic CuFe2O4@Ag@ZIF-8 Nanocomposites with Highly Catalytic Activity Based on Cellulose Nanocrystals

Zhang

Zhao

et al. 2019

Molecules

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A facile approach was successfully developed for synthesis of cellulose nanocrystals (CNC)-supported magnetic CuFe 2 O 4 @Ag@ZIF-8 nanospheres which consist of a paramagnetic CuFe 2 O 4 @Ag core and porous ZIF-8 shell. The CuFe 2 O 4 nanoparticles (NPs) were first prepared in the presence of CNC and dispersant. Ag NPs were then deposited on the CuFe 2 O 4 /CNC composites via an in situ reduction directed by dopamine polymerization (PDA). The CuFe 2 O 4 /CNC@Ag@ZIF-8 nanocomposite was characterized by TEM, FTIR, XRD, N 2 adsorption-desorption isotherms, VSM, and XPS. Catalytic studies showed that the CuFe 2 O 4 /CNC@Ag@ZIF-8 catalyst had much higher catalytic activity than CuFe 2 O 4 @Ag catalyst with the rate constant of 0.64 min −1 . Because of the integration of ZIF-8 with CuFe 2 O 4 /CNC@Ag that combines the advantaged of each component, the nanocomposites were demonstrated to have an enhanced catalytic activity in heterogeneous catalysis. Therefore, these results demonstrate a new method for the fabrication of CNC-supported magnetic core-shell catalysts, which display great potential for application in biocatalysis and environmental chemistry.Molecules 2020, 25, 124 2 of 15 More often, hybrid composites are fabricated through an in-situ method, where the templates have a high affinity towards metal ions that allows for the synthesis of metallic nanoparticles [8]. Cellulose nanocrystals (CNC) are derived from abundant cellulosic resources such as plants and microbial cellulose via sulfuric acid hydrolysis [9,10]. CNC have well-defined size and morphology, high specific surface area, high aspect ratio, high crystalline order, chirality, high mechanical strength, and controllable surface chemistry [11], which are appealing in a plethora of materials to catalytic applications. As reported in our previous research [12], the CuFe 2 O 4 /CNC nanocomposites show good dispersity and it has been suggested that the nanocomposites do catalyze 4-NP reduction.To further improve the catalytic activity, various core/shell-structured magnetic nanocatalysts have been applied in nanocatalysis [13][14][15][16]. The as-obtained CuFe 2 O 4 based core-shell nanocomposites showed excellent catalytic activity, magnetic separation, and magnetic carrying in nanocatalysis. Recently, the Ag modified magnetic composites have gained increasing attention because of the high catalytic activity of the Ag component, the good magnetic responsiveness of the magnetic core, and the relatively facile fabrication process [17][18][19]. Various noble metals, including Au, Pd, and Pt have been widely employed as catalysts for the reduction of 4-NP to 4-AP by NaBH 4 in aqueous media [20][21][22][23]. Moreover, Ag is more suitable for large-scale application than other noble metals (Au, Pd, and Pt) because of its low price [24]. Dopamine can self-polymerize under specific conditions to form a polydopamine (PDA) complex which has the ability of adhering onto the surface of various materials due to the strong stickiness [25][26][27] and the abundant catech...

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Section: Catalytic Reduction Of 4-nitrophenolmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Preparation of Magnetic CuFe2O4@Ag@ZIF-8 Nanocomposites with Highly Catalytic Activity Based on Cellulose Nanocrystals

Zhang

Zhao

et al. 2019

Molecules

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“…Literature studies reveal that photocatalytic reduction of PNP is mostly carried out by heterogeneous catalysis using various metal-based nanostructures. [18][19][20] However, no homogenous catalyst has been reported so far to reduce PNP to PAP.…”

Section: Introductionmentioning

confidence: 99%

“…Their lower cost, readily availability, insensitivity to air, easy handling, and generation of less waste make them versatile catalysts in various organic reaction like synthesis of enzymes, [28] oxidative polymerization of aniline, [29] rearrangement reactions of aldoxime, [30] and reductions of nitroarenes. [20] Furthermore, copper is the second abundant transition metal inside human body and can be easily metabolized by the body metabolic system. [31] Its antimicrobial nature and biocompatible features make it a suitable catalyst for biological applications.…”

Section: Introductionmentioning

confidence: 99%

A copper diimine‐based honeycomb‐like porous network as an efficient reduction catalyst

Ahmad

Shah

Arshad

et al. 2020

Applied Organom Chemis

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Funding information Higher Education Commission of Pakistan Nitrophenols are among the widely used industrial chemicals worldwide; however, their hazardous effects on environment are a major concern nowadays. Therefore, the conversion of environmentally detrimental p-nitrophenol (PNP) to industrially valuable p-aminophenol (PAP), a prototype reaction, is an important organic transformation reaction. However, the traditional conversion of PNP to PAP is an expensive and environmentally unfriendly process. Here, we report a honeycomb-like porous network with zeolite-like channels formed by the self-organization of copper, 1,10-phenanthroline, 4,4 0-bipyridine, and water. This porous network effectively catalyzed the transformation of hazardous PNP to pharmaceutically valued PAP. In the presence of complex, PNP to PAP conversion occurred in a few minutes, which is otherwise a very sluggish process. To assess the kinetics, the catalytic conversion of PNP to PAP was studied at five different temperatures. The linearity of lnC t /C o versus temperature plot indicated pseudo-first-order kinetics. The copper complex with zeolite like channels may find applications as a reduction catalyst both on laboratory and industrial scales and in green chemistry for the remediation of pollutants.

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“…In this context, NaBH 4 turns out to be the most popular reductant since it is commercially available and cheap. Meanwhile, a series of catalysts, particularly the heterogeneous catalysts, have been employed to activate the NaBH 4 . Despite the great advance in this field, the reported procedures still suffered some drawbacks such as long reaction time, poor recyclability of the catalysts as well as tedious work‐up.…”

Section: Introductionmentioning

confidence: 99%

Magnetically Recyclable Metal–Organic Framework@Fe₃O₄ Composite‐Catalyzed Facile Reduction of Nitroarene Compounds in Aqueous Medium

Yang

Zhang

Chen

et al. 2017

Applied Organom Chemis

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A kind of Metal–organic framework (MOF) composite namely Cu‐BTC@Fe3O4 (BTC = 1,3,5‐benzenetricarboxylate) was prepared and showed good catalytic activity toward the reduction of nitroarenes. This reaction proceeded smoothly under mild reaction conditions in aqueous medium using sodium borohydride as the reduction agent, affording the corresponding anilines in good to excellent yields. In addition, the catalyst could be easily recovered with an external permanent magnet and be reused for successive six runs with slight decrease in its activity.

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Preparation of magnetically separable Cu6/7Co1/7Fe2O4–graphene catalyst and its application in selective reduction of nitroarenes

Cited by 52 publications

References 34 publications

Preparation of Magnetic CuFe2O4@Ag@ZIF-8 Nanocomposites with Highly Catalytic Activity Based on Cellulose Nanocrystals

Preparation of Magnetic CuFe2O4@Ag@ZIF-8 Nanocomposites with Highly Catalytic Activity Based on Cellulose Nanocrystals

A copper diimine‐based honeycomb‐like porous network as an efficient reduction catalyst

Magnetically Recyclable Metal–Organic Framework@Fe₃O₄ Composite‐Catalyzed Facile Reduction of Nitroarene Compounds in Aqueous Medium

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Preparation of magnetically separable Cu6/7Co1/7Fe2O4–graphene catalyst and its application in selective reduction of nitroarenes

Cited by 52 publications

References 34 publications

Preparation of Magnetic CuFe2O4@Ag@ZIF-8 Nanocomposites with Highly Catalytic Activity Based on Cellulose Nanocrystals

Preparation of Magnetic CuFe2O4@Ag@ZIF-8 Nanocomposites with Highly Catalytic Activity Based on Cellulose Nanocrystals

A copper diimine‐based honeycomb‐like porous network as an efficient reduction catalyst

Magnetically Recyclable Metal–Organic Framework@Fe3O4 Composite‐Catalyzed Facile Reduction of Nitroarene Compounds in Aqueous Medium

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Magnetically Recyclable Metal–Organic Framework@Fe₃O₄ Composite‐Catalyzed Facile Reduction of Nitroarene Compounds in Aqueous Medium