Rapid biological synthesis of platinum nanoparticles using Ocimum sanctum for water electrolysis applications
- 736 Downloads
The leaf extract of Ocimum sanctum was used as a reducing agent for the synthesis of platinum nanoparticles from an aqueous chloroplatinic acid (H2PtCl6·6H2O). A greater conversion of platinum ions to nanoparticles was achieved by employing a tulsi leaf broth with a reaction temperature of 100 °C. Energy-dispersive absorption X-ray spectroscopy confirmed the platinum particles as major constituent in the reduction process. It is evident from scanning electron microscopy that the reduced platinum particles were found as aggregates with irregular shape. Fourier-transform infrared spectroscopy revealed that the compounds such as ascorbic acid, gallic acid, terpenoids, certain proteins and amino acids act as reducing agents for platinum ions reduction. X-ray diffraction spectroscopy suggested the associated forms of platinum with other molecules and the average particle size of platinum nanoparticle was 23 nm, calculated using Scherer equation. The reduced platinum showed similar hydrogen evolution potential and catalytic activity like pure platinum using linear scan voltammetry. This environmentally friendly method of biological platinum nanoparticles production increases the rates of synthesis faster which can potentially be used in water electrolysis applications.
KeywordsBiological synthesis Nanoparticles Platinum Plant extract Ocimum sanctum
The authors would like to express their thanks to Instrumentation Division of CECRI for analyzing the samples.
- 1.Govindaraju K, Tamilselvan S, Kiruthiga V, Singaravelu G (2010) J Biopest 3:394–399Google Scholar
- 3.Garima S, Riju B, Kunal K, Ashish RS, Rajendra PS (2010) J Nanopart Res 1–8. doi: 10.1007/s11051-010-0193-y
- 9.Vineet K, Sudesh KY (2008) J Chem Technol Biotechnol 84:151–157Google Scholar
- 10.Shankar M, Bijay RM, Sushil CM (2009) Indian J Physiol Pharmacol 53:291–306Google Scholar
- 11.Wang M, Chen Q, Jiang C, Yang D, Liu X, Xu S (2007) Colloids Surf A Physicochem Eng Asp 30173–30179Google Scholar
- 16.Klug HP, Alexander LE (1974) X-ray diffraction procedures for polycrystalline and amorphous materials. Wiley, New YorkGoogle Scholar
- 17.Naheed A, Seema S, Singh VN, Shamsi SF, Anjum F, Mehta BR (2010) Biotechnol Res Int 10:1–8Google Scholar
- 18.Thirumurugan A, Jiflin GJ, Rajagomathi G, Neethu Anns T, Ramachandran S, Jaiganesh R (2010) Int J Biological Technol 1:75–77Google Scholar
- 19.Sastry M, Ahmad A, Mukherjee P, Senapati S, Mandal D, Khan M et al (2010) Colloids Surf B Biointerf 28:313–318Google Scholar