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Title: Facile synthesis and defect optimization of 2D-layered MoS2 on TiO2 heterostructure for industrial effluent, wastewater treatments
Authors: Gopal, R.
Chinnapan, M. M.
Bojarajan, A. K.
Rotte, N. K.
Ponraj, J. S.
Ganesan, R.
Atanas, I.
Nadarajah, M.
Manavalan, R. K.
Gaspar, J.
Issue Date: 2020
Publisher: Nature Research
Citation: Facile synthesis and defect optimization of 2D-layered MoS2 on TiO2 heterostructure for industrial effluent, wastewater treatments / R. Gopal, M. M. Chinnapan, A. K. Bojarajan, et al. — DOI 10.1038/s41598-020-78268-4 // Scientific Reports. — 2020. — Vol. 10. — Iss. 1. — 21625.
Abstract: Current research is paying much attention to heterojunction nanostructures. Owing to its versatile characteristics such as stimulating morphology, affluent surface-oxygen-vacancies and chemical compositions for enhanced generation of reactive oxygen species. Herein, we report the hydrothermally synthesized TiO2@MoS2 heterojunction nanostructure for the effective production of photoinduced charge carriers to enhance the photocatalytic capability. XRD analysis illustrated the crystalline size of CTAB capped TiO2, MoS2@TiO2 and L-Cysteine capped MoS2@TiO2 as 12.6, 11.7 and 10.2 nm, respectively. The bandgap of the samples analyzed by UV–Visible spectroscopy are 3.57, 3.66 and 3.94 eV. PL spectra of anatase phase titania shows the peaks present at and above 400 nm are ascribed to the defects in the crystalline structure in the form of oxygen vacancies. HRTEM reveals the existence of hexagonal layered MoS2 formation on the spherical shaped TiO2 nanoparticles at the interface. X-ray photoelectron spectroscopy recommends the chemical interactions between MoS2 and TiO2, specifically, oxygen vacancies. In addition, the electrochemical impedance spectroscopy studies observed that L-MT sample performed low charge transfer resistance (336.7 Ω cm2) that promotes the migration of electrons and interfacial charge separation. The photocatalytic performance is evaluated by quantifying the rate of Congo red dye degradation under visible light irradiation, and the decomposition efficiency was found to be 97%. The electron trapping recombination and plausible photocatalytic mechanism are also explored, and the reported work could be an excellent complement for industrial wastewater treatment. © 2020, The Author(s).
Access: info:eu-repo/semantics/openAccess
SCOPUS ID: 85097419404
PURE ID: 20220374
ISSN: 20452322
DOI: 10.1038/s41598-020-78268-4
metadata.dc.description.sponsorship: The authors (Dr. G. Ramalingam & Prof. G. Ravi) acknowledge the financial support from MHRD-SPARC (ID: 890/2019), UKIERI, DST-SERB(EEQ/2016/00198), RUSA 2.0 Grant No. F.24-51/2014-U, Policy (TN Multi-Gen) by the Government of India and UK projects. Part of this work was developed under “Smart Surfaces for Automotive Components (SMART4CAR)” Project, receiving funding from COMPETE agency, PT2020 funding program, under contract No.: POCI-01-0247-FEDER-045096. The project team members, Jordi Llobet, Helder Fonseca and Patrícia C. Sousa are also acknowledged. The author J. S. Ponraj acknowledges the funding and support from EU-EC/MSCA-COFUND-2015-FP Nano TRAIN for Growth II N°: 713640, INSPIRE Faculty Scheme (DST/INSPIRE/04/2016/000292) and SERB-EMR (EMR/2017/004764).
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