Synthesis Of Air Stable Copper Nanoparticles And Their Use In Catalysis

Razium  Ali Soomro1*, Syed Tufail Hussain Sherazi1, Sirajuddin1, Najma Memon1,  Mohammad Raza Shah2, Nazar Hussain Kalwar1, Keith Richard  Hallam3, Afzal Shah4

1National Centre of Excellence in Analytical Chemistry, University of Sindh, Jamshoro 76080, Pakistan

2International Centre for Chemical and Biological Sciences, HEJ Research Institute of Chemistry University of Karachi, Pakistan

3Interface Analysis Centre, School of Physics, University of Bristol, Bristol, BS8 1TL, United Kingdom

4Department of Chemistry, University of Science & Technology, Bannu 28100, Khyber Pakhtunkhwa, Pakistan

Adv. Mater. Lett., 2014, 5 (4), pp 191-198

DOI: 10.5185/amlett.2013.8541

Publication Date (Web): Feb 16, 2014

E-mail: raziumsoomro@gmail.com

Abstract


The undertaken study describes synthesis of air resistant copper nanoparticles (Cu NPs) in an aqueous phase using sodium borohydride as a reducing agent via chemical reduction method. The hydrosol has resistant to oxidation by atmospheric oxygen for several days. The air stability was induced by capping Cu NPs with anionic surfactant “sodium dodecyl sulfate (SDS)”.  Ascorbic acid was used as an antioxidant. These Cu NPs were characterized by ultraviolet-visible (UV-VIS) spectroscopy, which contributed towards the understanding of surface plasmon resonance (SPR) generation and optical behavior of Cu NPs. It was used as an optical tracer for size control and confirmation of Cu NPs and was found to be affected by various parameters like reaction time, pH, concentration of copper sulfate and the surfactant SDS. SPR peaks were found to shift from 597 to 569 nm, while apparent color changes from yellow to brick red.  Further characterization studies were carried out by using fourier transform infrared (FT-IR) spectroscopy to investigate the co-ordination between Cu NPs and SDS. X-ray diffraction (XRD) was used for phase purity of Cu NPs. Transmission electron microscopy (TEM) and atomic force microscopy (AFM) were used the size and morphological characterization. The average size of the Cu NPs was found to be 15 nm in diameter with an average height of 14 nm. The Cu NPs showed excellent catalytic activity in the reductive degradation of Eosin B (EB) dye in just 16 sec of reaction time and maintained their catalytic activity when reused multiple times. The degradation rate was found to follow first order reaction kinetics with the EB degradation. The Cu NPs enhanced the rate of EB degradation 30 times more than the control test. Copper was found an attractive catalyst in the nanosize regimes. The Cu NPs are more economical as compared to noble metals. The Cu NPs are expected to be suitable alternative and play an imperative role in the fields of catalysis and environmental remediation.

Keywords

Copper nanoparticles, sodium dodecyl sulfate, eosin B, nanocatalysts.

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