title: Degradation of environment pollutant dyes using phytosynthesized metal nanocatalysts.
abstract: We present for the first time biogenic reduction and stabilization of gold and silver ions at room temperature using fruit juice of Punica granatum. The formation, morphology and crystalline structure of the synthesized nanoparticles are determined using UV-Visible, XRD and TEM. An attempt to reveal the partial role of phenolic hydroxyls in the reduction of Au(3+) and Ag(+) is done through FTIR analysis. The synthesized nanoparticles are used as potential catalysts in the degradation of a cationic phenothiazine dye, an anionic mono azo dye and a cationic fluorescent dye. The calculated values of percentage removal of dyes and the rate constants from pseudo first order kinetic data fit give a comparative study on degradation of organic dyes in presence of prepared gold and silver nanoparticles.
authors.affiliation: Department of Physics, Mar Ivanios College, Thiruvananthapuram 695 015, India.
authors.forename: M
authors.initials: M
authors.lastname: MeenaKumari
authors.affiliation: Department of Physics, Mar Ivanios College, Thiruvananthapuram 695 015, India. Electronic address: daizyp@rediffmail.com.
authors.forename: Daizy
authors.initials: D
authors.lastname: Philip
mesh_terms: D001673:Biodegradation, Environmental; D002384:Catalysis; D004396:Coloring Agents / Q000737:chemistry*; D004785:Environmental Pollutants / Q000737:chemistry*; D006046:Gold / Q000737:chemistry*; D007700:Kinetics; D029561:Lythraceae / Q000737:chemistry; D053768:Metal Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure; D010316:Particle Size; D010788:Photosynthesis; D012834:Silver / Q000737:chemistry*; D013056:Spectrophotometry, Ultraviolet; D017550:Spectroscopy, Fourier Transform Infrared; D013997:Time Factors; D014961:X-Ray Diffraction
chemical_list: D004396:Coloring Agents; D004785:Environmental Pollutants; D012834:Silver; D006046:Gold
keywords: Catalysis; Gold nanoparticles; Organic dyes; Rate constant; Silver nanoparticles; Surface plasmon resonance