One-pot synthesis of Au-M@SiO2 (M = Rh, Pd, Ir, Pt) core–shell nanoparticles as highly efficient catalysts for the reduction of 4-nitrophenol

Abstract

The conversion of p-nitrophenol (4-NP) to p-aminophenol (4-AP) is of great significance for pharmaceutical and material manufacturing. In this work, Au-M@SiO2 (M = Rh, Pd, Ir, Pt) nanoparticles (NPs) with core–shell structures, which are expected to be excellent catalysts for the transformation of 4-NP to 4-AP, were synthesized by a facile one-pot one-step method. The structure and composition of the NPs were characterized through transmission electron microscopy, X-ray powder diffraction and X-ray photoelectron spectroscopy. Au-M@SiO2 (M = Rh, Pd, Ir, Pt) core–shell NPs showed excellent catalytic activity in the reduction of 4-NP, which is superior to most catalysts reported in the previous literature. The enhanced catalytic activity of Au-M@SiO2 core–shell NPs is presumably related to the bimetallic synergistic effect. This study provides a simple strategy to synthesize core–shell bimetallic NPs for catalytic applications.

An Environmentally Friendly Approach for the Synthesis of Au Nanoparticles Supported Mesoporous Silica for Catalytic Applications

“…The higher catalytic efficiency of SA1 than SA2 can be related to smaller Au NPs in SA1 sample. The observed k values are much higher than that reported for other Au/SiO2 catalyst used in 4-NP reduction [24].…”

Edge-oriented phosphatizing engineering of 2D Ni-MOFs with a tailored d-band center for boosting catalytic activity

“…43,44 The good performance of Ni-MOF-270P is highlighted by comparing the normalized turnover frequency (TOF, defined as the amount of reactant that is converted into product per minute by 1 g metal) of Ni-MOF-270P with recently reported catalysts. 33,[45][46][47][48][49][50][51][52][53] Inductively coupled plasma atomic emission spectrometry (ICP-AES) reveals that the content of Ni in Ni-MOF-270P was 33.68%, and the content of P was 1.71%. This again proves that the catalytic performance can be significantly improved by phosphating the edges of Ni-MOF with a very small amount of P. As shown in Fig.…”

Nitrogen and sulfur dual doped porous carbon as metal-free catalyst for oxidative degradation of 4-nitrophenol by persulfate activation

“…4-nitrophenol (PNP) is a toxic and persistent contaminant of industrial effluents, soil, and groundwater that is widely used in the synthesis of pesticides, herbicides, pharmaceuticals, and dyes 1 , 2 . It has been considered the priority pollutant in several countries resulting in potential risk to humans and the ecosystem even at low concentrations 3 , 4 .…”