title: Changes in spectrochemical and catalytic properties of biopolymer anchored Cu(II) and Ni(II) catalysts by electron beam irradiation.
abstract: Chitosan (a biopolymer) anchored Cu(II) and Ni(II) Schiff base complexes, [M(OIAC)Cl2] (M: Cu/Ni and OIAC: ([2-oxo-1H-indol-3-ylidene]amino)chitosan) were electron beam irradiated by different doses (100 Gy, 1 kGy and 10 kGy). The electron beam has shown potential impact on biopolymer's support, in detail chain linking and chain scissoring, as evidenced by viscosity studies, FT-IR and X-ray diffraction spectroscopic techniques. Due to these structural changes, thermal properties of the complexes were found to be changed. The surface of these heterogeneous complexes was also effectually altered by electron beam. As a consequence, pores and holes were created as probed by SEM technique. The catalytic activity of both non-irradiated and irradiated complexes was investigated in the aerobic oxidation of cyclohexane using hydrogen peroxide oxidant. The catalytic ability of the complexes was enhanced significantly after irradiation as the result of surface changes. The reusability of the complexes was also greatly affected because of the structural variations in polymeric support. In terms of both better catalytic activity along with the reusability, 1 kGy is suggested as the best dose to attain adequate increase in catalytic activity and good reusability.
authors.affiliation: Centre for Scientific and Applied Research, PSN College of Engineering and Technology, Tirunelveli 627 152, India; Department of Chemistry, Indian Institute of Technology Bombay, Mumbai 400076, India.
authors.forename: R
authors.initials: R
authors.lastname: Antony
authors.affiliation: Centre for Scientific and Applied Research, PSN College of Engineering and Technology, Tirunelveli 627 152, India.
authors.forename: P S
authors.initials: PS
authors.lastname: Suja Pon Mini
authors.affiliation: Centre for Scientific and Applied Research, PSN College of Engineering and Technology, Tirunelveli 627 152, India. Electronic address: s.theodore.david@gmail.com.
authors.forename: S
authors.initials: S
authors.lastname: Theodore David Manickam
authors.affiliation: Microtron Centre, Mangalore University, Mangalagangotri 574 199, India.
authors.forename: Ganesh
authors.initials: G
authors.lastname: Sanjeev
authors.affiliation: Department of Chemistry, University of Pitesti, Pitesti 110040, Romania.
authors.forename: Liviu
authors.initials: L
authors.lastname: Mitu
authors.affiliation: Centre for Scientific and Applied Research, PSN College of Engineering and Technology, Tirunelveli 627 152, India.
authors.forename: S
authors.initials: S
authors.lastname: Balakumar
mesh_terms: D001704:Biopolymers / Q000737:chemistry*; D002384:Catalysis; D003300:Copper / Q000737:chemistry*; D004055:Differential Thermal Analysis; D004583:Electrons; D008855:Microscopy, Electron, Scanning; D009532:Nickel / Q000737:chemistry*; D017550:Spectroscopy, Fourier Transform Infrared; D013997:Time Factors; D014783:Viscosity; D014961:X-Ray Diffraction
chemical_list: D001704:Biopolymers; D003300:Copper; D009532:Nickel
keywords: Chitosan; Cyclohexane; Electron beam; Scanning electron microscopy; Schiff base