Gold-supported magnetically recyclable nanocatalysts: a sustainable solution for the reduction of 4-nitrophenol in water

Abstract

Magnetic core-double shell silica nanosupports functionalized with amine and thiol groups successfully immobilized Au NPs, producing novel magnetically recyclable nanocatalysts for the reduction of 4-nitrophenol in water in the presence of NaBH4.

Reduction of 4-nitrophenol to 4-aminophenol using a novel Pd@NixB–SiO2/RGO nanocomposite: enhanced hydrogen spillover and high catalytic performance

“…16 The calculated value of k was 0.017 s -1 for Pd@NSG nanocomposite, a value higher than previously reported works. 16 The calculated value of k was 0.017 s -1 for Pd@NSG nanocomposite, a value higher than previously reported works.…”

“…13 On the other hand, 4-nitrophenol (4-NP) is a pollutant and an effluent in many chemicals and drug industries and therefore its efficient quick degradation is required. 14,[16][17][18][19] A recent work demonstrated the successful reduction of 4-NP using Pd/RGO nanocomposite in a very short time (120 sec). 15 For this hydrogenation process, several kinds of 55 catalysts are still being investigated and several examples can be found in the scientific literature.…”

“…16,37 Subsequently, 100 mL dispersion of GO was prepared in methanol (1 mg/mL) by bath sonication (2 h). 16,37 Subsequently, 100 mL dispersion of GO was prepared in methanol (1 mg/mL) by bath sonication (2 h).…”

CuPd Bimetallic Nanoparticles Supported on Magnesium Oxide as an Active and Stable Catalyst for the Reduction of 4-Nitrophenol to 4-Aminophenol

“…This period of time for the reaction to start has been previously observed in several catalytic systems applied in this reaction, for example, for Co [33], Cu [8] or Au [34] catalysts. The causes of this induction period have been deeply studied for Au faceted metal particles [3] and the authors stated that any limitation by diffusion can be discarded.…”

Gold nanoparticle modified magnetic fibrous silica microspheres as a highly efficient and recyclable catalyst for the reduction of 4-nitrophenol

“…10,11 To solve this problem, NMNPs have been grafted onto various supporting matrices to generate hybrid catalysts to protect against the aggregation of NMNPs. [19][20][21][22][23] Therefore, it is highly desirable to prepare magnetic silica materials with easy accessible high surface areas, high-efficiency mass transfer, as well as magnetic separation property, to further fabricate NMNPs-based catalysts for organic catalytic reactions. 8,[12][13][14][15][16] Although these mesoporous silicas have regular mesopores and high specific surface areas that can support NMNPs with high dispersion, their mesopores can always be easily blocked because of the small pore size.…”