Modern Chemistry & Applications

Page 46 Modern Chemistry & Applications| ISSN : 2329-6798 Chemistry World 2019 Volume 07 May 09-10, 2019 | Amsterdam, Netherlands Chemistry 10th International Conference on Synthesis and characterization of gum arabic mi

10^th International Conference on Chemistry

May 09-10, 2019 | Amsterdam, Netherlands

Muhammad Farooq

Pakistan Institute of Engineering and Applied Sciences, Pakistan

Posters & Accepted Abstracts: Mod Chem Appl

Abstract:

The work presented here describes the successful synthesis and characterization of gum arabic (GA) microgel for in-situ metal nanoparticles preparation for further use in the catalytic reduction of 4-nitrophenol (4- NP) to 4-nitroaniline (4-NA). A reverse micellization method was owned to prepare GA based spherical microgels with a high yield of up to 79% in 5-50 μm size range via successful crosslinking by divinyl sulfone (DVS) in gasoline medium. The as-synthesized microgels were used as a template for in situ fabrication of nickel (Ni) and copper (Cu) nanoparticles (NPs) using their corresponding salts as metal ion source and NaBH4 as reducing agent. The successful synthesis of the prepared microgels thereafter in situ fabrication of nanoparticles was confirmed from fourier transform infrared spectroscopy (FTIR), differential scanning calorimetry (DSC), x-ray diffraction characterization, thermal gravimetric analysis (TGA), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The Ni and Cu NPs loaded microgels were known as GA-Ni and GA-Cu microgels with nickel and copper NPs respectively. Further, the catalytic reduction characteristics of the prepared GA-Ni and GA-Cu composite microgels towards 4-NP were evaluated. Interestingly, the hybrid microgel show enhanced catalytic activity for the conversion of 4-NP to 4-NA which follows pseudo-first order kinetic rate law as well. A time delay of 8-10 minutes for all different amounts was observed for this catalytic reduction at room temperature 25oC; whereas the reduction interval was reduced to six minutes when of 0.05 g GA-Ni microgels were used.