Fabrication of silver nanoparticles in pH responsive polymer microgel dispersion for catalytic reduction of nitrobenzene in aqueous medium
- Autores: Farooqi Z.1, Begum R.2, Naseem K.1, Rubab U.1, Usman M.3, Khan A.3, Ijaz A.1
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Afiliações:
- Institute of Chemistry
- Centre for Undergraduate Studies
- Department of Chemistry
- Edição: Volume 90, Nº 13 (2016)
- Páginas: 2600-2608
- Seção: Physical Chemistry of Nanoclusters and Nanomaterials
- URL: https://journals.rcsi.science/0036-0244/article/view/169121
- DOI: https://doi.org/10.1134/S0036024416130239
- ID: 169121
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Resumo
Copolymer microgels based on N-isopropylacrylamide (NIPAM) and methacrylic acid (MAA) have been synthesized by free radical emulsion polymerization using N,N-methylenebisacrylamide (BIS) as a cross-linker. Synthesized microgels were characterized by Fourier transform infrared spectroscopy (FTIR). Then silver nanoparticles were fabricated in the synthesized microgels by in-situ reduction of AgNO3 with NaBH4. The formation of silver nanoparticles was confirmed by UV–Vis spectroscopy. The pH sensitivity of the copolymer microgels was investigated using dynamic light scattering technique (DLS). Hydrodynamic radius of P (NIPAM–MAA) microgels increases with increase in pH of the medium at 25°C. Surface plasmon resonance wavelength (λSPR) of silver nanoparticles increases with increase in hydrodynamic radius due to change in pH of the medium. The catalytic activity for the reduction of nitrobenzene (NB), an environmental pollutant, into aniline was investigated by UV–Vis spectroscopy in excess of NaBH4 using hybrid microgels as catalyst. The value of apparent rate constant (kapp) of the reaction was calculated using pseudo first order kinetic model and it was found to be linearly related to the amount of catalyst. The results were compared with literature data. The system was found to be an effective catalyst for conversion of NB into aniline.
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Sobre autores
Zahoor Farooqi
Institute of Chemistry
Autor responsável pela correspondência
Email: zhfarooqi@gmail.com
Paquistão, New Campus Lahore, 54590
Robina Begum
Centre for Undergraduate Studies
Email: zhfarooqi@gmail.com
Paquistão, New Campus Lahore, 54590
Khalida Naseem
Institute of Chemistry
Email: zhfarooqi@gmail.com
Paquistão, New Campus Lahore, 54590
Uma Rubab
Institute of Chemistry
Email: zhfarooqi@gmail.com
Paquistão, New Campus Lahore, 54590
Muhammad Usman
Department of Chemistry
Email: zhfarooqi@gmail.com
Paquistão, Faisalabad, 38000
Abbas Khan
Department of Chemistry
Email: zhfarooqi@gmail.com
Paquistão, Mardan, 23200
Aysha Ijaz
Institute of Chemistry
Email: zhfarooqi@gmail.com
Paquistão, New Campus Lahore, 54590