Magnetic GO‐PANI decorated with Au NPs: A highly efficient and reusable catalyst for reduction of dyes and nitro aromatic compounds

Abstract

Due to the high activity of Au nanoparticles (NPs) for various reactions, many researchers have tried to develop heterogeneous catalysts in order to prevent irreversible agglomeration of Au NPs. Herein, magnetic graphene oxide modified with polyaniline (PANI) was used as a support for Au NPs that brings together advantages including: uniform dispersal of the catalyst in water,alarge surface area related to the graphene oxide; easy electron transfer in chemical reactions and good attachment of Au NPs to the support associated with PANI; and finally facile recovery in the presence of a magnetic field. Catalytic reduction of different analytes (Congo red, methylene blue, rhodamine B and 4-nitro phenol) was evaluated in the presence of NaBH 4 and the results show high catalytic activity of the catalyst. The catalyst was thoroughly characterized using various methods including FTIR, XRD, XPS, FE-SEM and HRTEM analyses while its catalytic activity was evaluated via reduction of different analytes.

Insights into the interaction between PANI and Au NPs of magnetic core‐shell Fe3O4/PANI/Au catalysts with remarkable catalytic performance in 4‐NP reduction

“…Table 1 shows the k ′ value of PANI supported Au catalysts reported in the literatures. The k ′ is calculated as 303.04 and 145.87 s −1 ·g Au −1 for Fe 3 O 4 /PANI/Au(Sol) and Fe 3 O 4 /PANI/Au(In Situ), which is higher than that of polystyrene/PANI/Au (Au size 10–100 nm, Au loading 4.59 wt%), 13 Fe 3 O 4 @Au‐PANI (Au size 15 nm, Au loading 15.547 wt%), 34 and PANI@magnetic graphene oxide/Au (Au size 5 nm, Au loading 2.365 wt%) 35 . The k ′ of Fe 3 O 4 /PANI/Au(Sol) is the highest among the seven kinds catalysts listed in Table 1, which is nearly 1.7 times the value of PANI(Spindle‐shaped)/Au with the same gold loading (0.498%) and similar Au size (2–6 nm) 14 .…”

A comprehensive review on synthesis of dihydropyrimidione via Biginelli reaction catalyzed by reusable magnetic nanocatalyst (from 2020–till date)

“…[48][49][50][51] Catalysis has played an important role in improving and expanding organic synthesis, notably in medicinal chemistry, and has grown into one of the most cost-effective and environmentally sustainable approaches to date. [52][53][54] F I G U R E 2 Plausible mechanistic pathway of Biginelli reaction.…”

Highly efficient N‐doped carbon supported FeSx‐Fe2O3 catalyst for hydrogenation of nitroarenes via pyrolysis of sulfurized N,Fe‐containing MOFs

“…Recyclability of catalysts is a significant criterion in the heterogeneous reactions. [60][61][62] Therefore, the reusability of FeS x -Fe 2 O 3 @CN-8 catalyst was investigated in Figure 6. The magnetic property of FeS x -Fe 2 O 3 @CN-8 was measured by the Quantum Design SQUID MPMS-XL7 magnetometer.…”