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Synthesis of Silver Nanoparticles by Microwave irradiation and investigation of their Catalytic activity

Author Affiliations

  • 1Department of Chemistry, St. George’s College, Aruvithura, Kottayam, Kerala, INDIA
  • 2School of chemical sciences, Mahatma Gandhi University, Kottayam, Kerala, INDIA

Res. J. Recent Sci., Volume 3, Issue (ISC-2013), Pages 185-191, (2014)


In this study, silver nanoparticles (AgNPs) have been synthesized in aqueous medium by a simple, efficient and economic microwave assisted synthetic route using hexamine as the reducing agent and the biopolymer pectin as stabilizer. The synthesized AgNPs were characterized by UV-vis. spectroscopy, Energy dispersive X-ray (EDX), X-ray diffraction (XRD) and Transmission electron microscopy (TEM) techniques. TEM images suggest that the nanoparticles are of spherical shape with an average diameter of 18.84 nm. The reduction of 4-nitrophenol to 4-aminophenol by NaBH in aqueous medium was selected as a model reaction to investigate the catalytic activity of AgNPs. The pectin stabilized silver nanoparticles (AgNP-pectin) were found to exhibit very good catalytic activity and the reaction followed pseudo-first order kinetics. The rate of reaction was found to increase with increasing temperature and the activation energy was found to be 47.3 kJ mol-1.


  1. Murray R.W., Nanoelectrochemistry: metal nanoparticles, nanoelectrodes and nanopores, Chem Rev., 108, 2688-2720 (2008)
  2. Kundu S, Mandal M, Ghosh S.K. and Pal T., Photochemical deposition of SERS active silver nanoparticles on silica gel and their application as catalysts for the reduction of aromatic nitro compounds, J. Colloid Interface Sci., 272, 134-144 (2004)
  3. Eychmuller A., Structure and photophysics of semiconductor nanocrystals, J. Phys. Chem. B,104, (2000)
  4. Salata O.V., Applications of nanoparticles in biology and medicine, J. Nanobiotechnol., 3-9 (2004)
  5. Ren X., Meng X., Chen D., Tang F. and Jiao J., Using silver nanoparticle to enhance current response of biosensor, Biosens. Bioelectron., 21, 433-437 (2005)
  6. Rivas L., Sanchez-cartos S., Garcia-Ramos J.V. and Marcillo G., Growth of silver colloidal particles obtained by citrate reduction to increase the Raman enhancement factor, Langmuir, 17, 574-577 (2001)
  7. Murthy P.S.K., Mohan Y.M., Varaprasad K., Sreedhar B. and Raju K.M., First successful design of semi-IPN Hydrogel-silver nanocomposites: A facile approach for antibacterial applications, J. Colloid Interface Sci., 318, 217-224 (2008)
  8. Esumi K., Isono R. and Yoshimura T., Preparation of PAMAM- and PPI- metal (silver, platinum and palladium) nanocomposites and their catalytic activities for reduction of 4-nitrophenol, Langmuir, 20, 237-243 (2004)
  9. Vigneshwaran N., Nachane R.P., Balasubramanya R.H. and Varadarajan P.V., A novel one-pot ‘green’ synthesis of stable silver nanoparticles using soluble starch, Carbohydr. Res., 341, 2012–2018 (2006)
  10. Vidhu V.K., Aromal S.A. and Philip D., Green synthesis of silver nanoparticles using Macrotyloma uniflorum,Spectrochim. Acta A,83, 392–397 (2011)
  11. Vigneshwaran N., Ashtaputre N.M., Varadarajan P.V., Nachane R.P., Par-Alikar K.M. and Balasubramanya R.H., Biological synthesis of silver nanoparticles using the fungus Aspergillus flavus, Mater. Lett., 61, 1413–1418(2007)
  12. Sreeram K.J., Nidhin M. and Nair B.U., Microwave assisted template synthesis of silver nanoparticles, Bull. Mater. Sci., 31, 937-942 (2008)
  13. Hu B., Wang S., Wang K., Zhang M. and Yu S., Microwave-assisted rapid facile “green” synthesis of uniform silver nanoparticles: Self-assembly into multilayered films and their optical properties, J. Phys. Chem. C, 112, 11169–11174 (2008)
  14. Chen J., Wang J., Zhang X. and Jin Y., Microwave-assisted green synthesis of silver nanoparticles by carboxymethyl cellulose sodium and silver nitrate, Mater. Chem. Phys., 108, 421-424 (2008)
  15. Rastogi P.K., Ganesan V. and Krishnamoorthi S., Microwave assisted polymer stabilized synthesis of silver nanoparticles and its application in the degradation of environmental pollutants, Mater. Sci. Eng. B,177, 456-461 (2012)
  16. Peng H., Yang A. and Xiong J., Green, microwave-assisted synthesis of silver nanoparticles using bamboo hemicelluloses and glucose in an aqueous medium,Carbohydr. Polym, 91348-355(2013)
  17. Wunder S., Polzer F., Lu Y., Mei Y. and Ballauff M., Kineticanalysis of catalytic reduction of 4-nitrophenol by metallic nanoparticles immobilized in spherical polyelectrolyte brushes, J. Phys. Chem. C, 114, 8814-8820 (2010)
  18. Sen I.K., Maity K. and Islam S.S., Green synthesis of gold nanoparticles using a glucan of an edible mushroom and study of catalytic activity, Carbohydr. Polym. 91, 518-528 (2013)
  19. Nemanashi M. and Meijboom R., Synthesis and characterization of Cu, Ag and Au dendrimers-encapsulated nanoparticles and their application in the reduction of 4-nitrophenol to 4-aminophenol, J. Colloid Interface Sci.,389, 260-267 (2013)
  20. Shin K.S., Choi J.Y., Park C.S., Jang H.J. and Kim K., Facile synthesis and catalytic application of silver- deposited magnetic nanoparticles, Catal. Lett., 133, 1-7 (2009)
  21. Nadagouda M.N., Speth T.F. and Varma R.S., Microwave-assisted green synthesis of silver nanostructures, Acc. Chem. Res., 44, 469-478 (2011)
  22. Pradhan N., Pal A. and Pal T., Catalytic reduction of aromatic nitrocompounds by coinage metal nanoparticles, Langmuir, 17, 1800-1802 (2001)
  23. Pradhan N., Pal A. and Pal T., Silver nanoparticle catalyzed reduction of aromatic nitro compounds, Colloids Surf. A, 196, 247-257 (2002)
  24. Lu Y., Mei Y., Walker R., Ballauff M. and Drechsler M., ‘Nano-tree’-type spherical polymer brush particles as templates for metallic nanoparticles, Polymer,47, 4985-4995 (2006)