Improved photo-degradation of dyes over Ag-loaded NiTiO3:V nanorods on visible-light-irradiation

Journal Article · Fri Jun 15 04:00:00 EDT 2018 · Materials Research Bulletin

DOI:https://doi.org/10.1016/J.MATERRESBULL.2018.02.043· OSTI ID:22804020

Mi, Longqing; Huang, Yanlin ^[1]; Qin, Lin

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1. State and Local Joint Engineering Laboratory for Novel Functional Polymeric Materials, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, 215123 (China)

Highlights: • Ag/NiTiO{sub 3}:V nanorods were prepared by electrospinning synthesis. • The crystalline crystal structure was refined. • The optical absorption and band structure were clarified. • Photocatalysis was greatly enhanced in Ag/NiTiO{sub 3}:V nanorods. • The photocatalysis activities and mechanisms were discussed. - Abstract: Pure and V-doped NiTiO{sub 3} (NiTiO{sub 3}:V) nanorods were synthesized via electrospinning synthesis using sol–gel precursors, followed by sintering the samples at 600 °C. And the subsequent Ag-loaded NiTiO{sub 3}:V nanorods were prepared by the chemical precipitation method (Ag/NiTiO{sub 3}:V). The phase formations were studied via X-ray powder diffraction (XRD) measurements. The Rietveld refinements were conducted to investigate the structural characteristics. The surface property of the nanorods was measured via morphologies and X-ray photon spectrascope (XPS) measurements. The absorption spectra of products indicate sufficient optical response in visible wavelength region. The indirect allowed band gap (2.18 eV) of NiTiO{sub 3} originates from the characteristic charge-transfer (CT) transitions of O{sup 2−} → Ti{sup 4+} (UV region) and Ni{sup 2+} → Ti{sup 4+} (visible light region). While Ag/NiTiO{sub 3}:V composites have a smaller band energy of 2.09 eV. The photocatalytic activities were investigated by photo-degradation of Rhodamine B (RhB) dye solutions under visible-light irradiation. The Ag/NiTiO{sub 3}:V nanorods were efficient for the photo-degradation of RhB dye solutions. EIS measurements were used to analyze the charge-carrier migration at the interfaces. The improved photocatalysis of Ag/NiTiO{sub 3}:V is ascribed to the narrowed band energy and enhanced efficiencies of the charge separations due to the Ag-coupling and V-doping in NiTiO{sub 3} lattices.

• OSTI ID: 22804020
• Journal Information: Materials Research Bulletin, Journal Name: Materials Research Bulletin Vol. 102; ISSN MRBUAC; ISSN 0025-5408
• Country of Publication: United States
• Language: English

Related Subjects

77 NANOSCIENCE AND NANOTECHNOLOGY
ABSORPTION SPECTRA
CHARGE CARRIERS
CRYSTAL STRUCTURE
DOPED MATERIALS
MORPHOLOGY
NANOSTRUCTURES
NICKEL COMPOUNDS
NICKEL IONS
PHOTOCATALYSIS
PRECIPITATION
RADIATION EFFECTS
RHODAMINES
SILVER
SINTERING
SOL-GEL PROCESS
SURFACE PROPERTIES
TITANATES
TITANIUM IONS
VANADIUM
VISIBLE RADIATION
X-RAY DIFFRACTION
X-RAY PHOTOELECTRON SPECTROSCOPY