Abstract
In situ preparation of gold nanoparticles (AuNPs) in the presence of silicate matrix, N1-(3-trimethoxysilylpropyl)diethylenetriamine (TPDT) and cetyltrimethylammonium bromide (CTAB), using strong reducing agents sodium borohydride (NaBH4) and hydrazine (N2H4) was established and their catalytic abilities were examined by choosing industrially important model reactions, in order to find the best reducing agent for the preparation of catalytically more active AuNPs. The prepared AuNPs were characterized using UV–vis absorption spectroscopy, XRD, HRTEM, EDX and SAED analyses. The AuNPs produced by NaBH4 showed relatively good mono-dispersion and small size than the AuNPs formed by N2H4. The catalytic activity of AuNPs produced by NaBH4 was found to be better than the AuNPs produced by N2H4 towards the reduction of various nitroaromatics. The turn over frequency (TOF) values obtained for the catalytic reduction of nitrobenzene (NB), 4-nitrophenol (4-NP) and 4-nitroaniline (4-NA) using the TPDT-Au-CTAB-NaBH4 catalyst are 0.312, 0.714 and 1.00s−1, respectively. Moreover, the rate constant (k) value obtained for the reduction of 4-NP is very high when compared to the reported results.
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