Materials Chemistry and Physics 224 (2019) 10–21
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Fabrication of TiO2/CoMoO4/PANI nanocomposites with enhanced photocatalytic performances for removal of organic and inorganic pollutants under visible light
T
Solmaz Feizpoora, Aziz Habibi-Yangjeha,∗, Kunio Yubutab, S. Vadivelc a
Department of Chemistry, Faculty of Science, University of Mohaghegh Ardabili, P.O. Box 179, Ardabil, Iran Institute for Materials Research, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, 980-8577, Japan c Department of Chemistry, PSG College of Technology, Coimbatore, 641004, Tamilnadu, India b
HIGHLIGHTS
GRAPHICAL ABSTRACT
/CoMoO /PANI nanocomposites • TiO as efficient photocatalysts are re2
4
ported.
TiO /CoMoO /PANI (30%) na• The nocomposite exhibited the highest ac2
4
tivity.
was 21.7-folds greater than • Activity TiO in RhB degradation under visible 2
•
light. The nanocomposite displayed substantial activity in degradations of pollutants.
ARTICLE INFO
ABSTRACT
Keywords: Photocatalyst Visible-light-induced TiO2/CoMoO4 TiO2/CoMoO4/PANI
Ternary photocatalysts with superior visible-light photocatalytic performances, were fabricated for the first time through integration of CoMoO4 and polyaniline (PANI) with TiO2. These photocatalysts were studied by XRD, EDX, SEM, HRTEM, XPS, BET, PL, UV–vis DRS, and FT-IR. The ternary nanocomposites showed a significantly great efficiency for photocatalytic degradation of Rhodamine B (RhB), methyl orange (MO), methylene blue (MB) and fuchsine, as organic pollutants, and photoreduction of Cr(VI), as an inorganic pollutant, in the presence of visible-light illumination, when compared with TiO2 and TiO2/CoMoO4 samples. The photodegradation efficiency of RhB over the TiO2/CoMoO4/PANI (30%) photocatalyst was 21.7 and 4.9-folds as high as the pure TiO2 and TiO2/CoMoO4 (30%) nanocomposite, respectively. Moreover, the as-synthesized TiO2/CoMoO4/PANI (30%) nanocomposite exhibited considerable photocatalytic activity in reduction of Cr(VI), which is 13.8 and 4.9-folds as high as the TiO2 and TiO2/CoMoO4 (30%) samples, respectively. Pursuant to the results, •O2− played critical role during the photocatalytic elimination of RhB. Furthermore, the ternary nanocomposite showed high photocatalytic stability. The present work provides a new approach to design ternary visible-light photocatalysts based on TiO2 with enhanced performances for water purifications.
1. Introduction
population have tremendously caused environmental contamination. Additionally, clean water resources are scarce [1,2]. Thus, effective treatment of wastewater and its recycling is highly importance.
Nowadays, huge industrialization and uncontrolled growth of
∗
Corresponding author. E-mail address:
[email protected] (A. Habibi-Yangjeh).
https://doi.org/10.1016/j.matchemphys.2018.11.076 Received 28 July 2018; Received in revised form 19 October 2018; Accepted 29 November 2018 Available online 30 November 2018 0254-0584/ © 2018 Elsevier B.V. All rights reserved.
