SiO2 caped Fe3O4 nanostructures as an active heterogeneous catalyst for 4-nitrophenol reduction

Muhammad Tariq Shah, Aamna Balouch, Sirajuddin, Ashfaque Ahmed Pathan, Abdullah, Ali Muhammad Mahar, Saman Sabir, Rozina Khattak, Ali Umar Akrajas

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

A simple, economic and one pot synthetic protocol was followed to synthesize Fe3O4 nanostructures using partial oxidation co-precipitation method under aerobic conditions. After synthesis, the nanostructures were coated with tetraethyl orthosilicate for stabilization purpose. Later on, these nanostructures were characterized by fourier transformed infrared spectroscopy, field emission scanning electron microscopy, transmission electron microscopy, X-ray diffraction, electron dispersive X-ray spectroscopy and atomic force microscopy to examine their size, shape and crystalline structure. The synthesized SiO2/Fe3O4 nanostructures with fine semi-spherical textures showed high heterogeneous catalytic activity for the reduction of 4-nitrophenol to 4-aminophenol using sodium borohydride (NaBH4) under microwave radiations. The effect of Different parameters such as concentration of reducing agent (NaBH4), quantity of catalyst applied and the effect of microwave irradiation time was evaluated to obtain good results for 4-nitrophenol reduction. The 99.5% 4-nitrophenol reduction was achieved by using 100 µg of SiO2/Fe3O4 nanocatalyst in a short reaction time. Furthermore, the 4-nitrophenol reduction process utilizing SiO2/Fe3O4 nanostructures as catalyst was very economical and efficient in term of ease of synthesis, low raw materials expenditure and fast recovery/separation of the catalyst using external magnetic field. Besides these characteristics the SiO2/Fe3O4 nanocatalyst is environment-friendly and bio compatible due to its extremely low toxicity. Based on the above characteristics, the SiO2/Fe3O4 nanocatalyst can find some potential applications as heterogeneous catalyst in environmentally and industrially important reactions.

Original languageEnglish
Pages (from-to)1-14
Number of pages14
JournalMicrosystem Technologies
DOIs
Publication statusAccepted/In press - 12 May 2017

Fingerprint

Nanostructures
catalysts
Catalysts
microwaves
tetraethyl orthosilicate
borohydrides
synthesis
reaction time
toxicity
Microwave irradiation
Reducing Agents
catalytic activity
economics
Reducing agents
field emission
Coprecipitation
X ray spectroscopy
x rays
textures
electron diffraction

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Hardware and Architecture
  • Electrical and Electronic Engineering

Cite this

SiO2 caped Fe3O4 nanostructures as an active heterogeneous catalyst for 4-nitrophenol reduction. / Shah, Muhammad Tariq; Balouch, Aamna; Sirajuddin; Pathan, Ashfaque Ahmed; Abdullah; Mahar, Ali Muhammad; Sabir, Saman; Khattak, Rozina; Akrajas, Ali Umar.

In: Microsystem Technologies, 12.05.2017, p. 1-14.

Research output: Contribution to journalArticle

Shah, Muhammad Tariq ; Balouch, Aamna ; Sirajuddin ; Pathan, Ashfaque Ahmed ; Abdullah ; Mahar, Ali Muhammad ; Sabir, Saman ; Khattak, Rozina ; Akrajas, Ali Umar. / SiO2 caped Fe3O4 nanostructures as an active heterogeneous catalyst for 4-nitrophenol reduction. In: Microsystem Technologies. 2017 ; pp. 1-14.
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