Journal
APPLIED SURFACE SCIENCE
Volume 449, Issue -, Pages 790-798Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2018.02.136
Keywords
Water splitting; Heterojunction; Antibiotic degradation; Hydrogen; OMCT/IMCT; TiO2/NiTiO3
Categories
Funding
- Ministry of New and Renewable Energy (MNRE), New Delhi, India [103/239/2015-NT]
- Science and Engineering Research Board Department of Science and Technology (SERB-DST), New Delhi, India [EMR/2014/000645]
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A UV and visible light responsive binary phase TiO2 coupled NiTiO3 nanocomposites were prepared by a facile co-precipitation method followed by calcination at elevated temperatures. The phase structure, morphology and optical properties of the nanocomposite were characterized by XRD, FE-SEM, HRTEM, UV-vis DRS, EIS and Raman spectra. XRD and Raman spectrum shows that between 650 degrees C and 850 degrees C, a phase transition takes place. FE-SEM and TEM analysis revealed that during the synthesis, growth of cylindrical shaped amorphous NiTiO3 took place and upon calcinations; it transforms into highly crystalline interlinked chain type morphology. A noticeable three distinct optical transitions corresponding to 3.1, 2.5 and 2.27 eV were observed by UV-vis diffuse reflection spectroscopy (DRS). The TiO2/NiTiO3 nanocomposite was used for Tetracycline and RhB photodegradation, and photocatalytic water splitting activity under UV-vis light irradiation. The results of this study showed that the nanocomposites calcined at 750 degrees C exhibit significantly higher photocatalytic degradation and water splitting activity. Based on the experimental results, an n-n heterojunction charge carrier transfer and separation mechanism is proposed. (C) 2018 Elsevier B.V. All rights reserved.
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