title: Novel metal-organic photocatalysts: synthesis, characterization and decomposition of organic dyes.
abstract: An efficient method for the photocatalytic degradation of methylene blue in an aqueous medium was developed using metal-organic complexes. Two novel complexes were synthesized using, Schiff base ligand, N'-[(E)-(4-ethylphenyl)methylidene]-4-hydroxybenzohydrazide (HL) and Ni(II) (Complex 1)/Co(II) (Complex 2) chloride respectively. These complexes were characterized using microanalysis, various spectral techniques. Spectral studies reveal that the complexes exhibit square planar geometry with ligand coordination through azomethine nitrogen and enolic oxygen. The effects of catalyst dosage, irradiation time and aqueous pH on the photocatalytic activity were studied systematically. The photocatalytic activity was found to be more efficient in the presence of Ni(II) complexes than the Co(II) complex. Possible mechanistic aspects were discussed.
authors.affiliation: Department of Chemistry, M. S. Ramaiah Institute of Technology, Bangalore 560 054, India; Visvesvaraya Technological University, Belgaum 590 018, India.
authors.forename: N B
authors.initials: NB
authors.lastname: Gopal Reddy
authors.affiliation: Department of Chemistry, M. S. Ramaiah Institute of Technology, Bangalore 560 054, India. Electronic address: muralikp21@gmail.com.
authors.forename: P
authors.initials: P
authors.lastname: Murali Krishna
authors.affiliation: Department of Chemistry, M. S. Ramaiah Institute of Technology, Bangalore 560 054, India. Electronic address: knrmsr@gmail.com.
authors.forename: Nagaraju
authors.initials: N
authors.lastname: Kottam
mesh_terms: D001391:Azo Compounds / Q000737:chemistry; D002384:Catalysis; D003035:Cobalt / Q000737:chemistry; D004396:Coloring Agents / Q000737:chemistry*; D056831:Coordination Complexes / Q000737:chemistry; D006834:Hydrazines / Q000138:chemical synthesis / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D008751:Methylene Blue / Q000737:chemistry; D015394:Molecular Structure; D008970:Molecular Weight; D009532:Nickel / Q000737:chemistry; D009584:Nitrogen / Q000737:chemistry; D009942:Organometallic Compounds / Q000138:chemical synthesis / Q000737:chemistry*; D010100:Oxygen / Q000737:chemistry; D010782:Photolysis; D012545:Schiff Bases / Q000737:chemistry; D013055:Spectrophotometry, Infrared; D013882:Thiosemicarbazones / Q000737:chemistry; D014466:Ultraviolet Rays
chemical_list: D001391:Azo Compounds; D004396:Coloring Agents; D056831:Coordination Complexes; D006834:Hydrazines; C000600016:N'-((E)-(4-ethylphenyl)methylidene)-4-hydroxybenzohydrazide; D009942:Organometallic Compounds; D012545:Schiff Bases; D013882:Thiosemicarbazones; C512188:azomethine; D003035:Cobalt; D009532:Nickel; D009584:Nitrogen; D010100:Oxygen; D008751:Methylene Blue
keywords: Metal–organic catalysts; Methylene blue; Photocatalytic activity