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Open AccessArticle

Polyaniline-Grafted RuO2-TiO2 Heterostructure for the Catalysed Degradation of Methyl Orange in Darkness

1
Laboratoire de Physique et Chimie des Matériaux (LPCM), Faculté des Sciences, Université Mouloud Mammeri, Tizi-Ouzou 15000, Algeria
2
Sorbonne Paris Cité, Université Paris Diderot, CNRS, ITODYS (UMR 7086), 75013 Paris, France
3
Université Paris Est, CNRS, ICMPE (UMR 7182), 94320 Thiais, France
4
Laboratoire de Chimie Appliquée et Génie Chimique, Université Mouloud Mammeri, Tizi-Ouzou 15000, Algeria
*
Authors to whom correspondence should be addressed.
Catalysts 2019, 9(7), 578; https://doi.org/10.3390/catal9070578
Received: 15 June 2019 / Revised: 28 June 2019 / Accepted: 29 June 2019 / Published: 30 June 2019
(This article belongs to the Special Issue Functional Organic-Inorganic Interfaces for Enhancing Catalysis)
Massive industrial and agricultural developments have led to adverse effects of environmental pollution resisting conventional treatment processes. The issue can be addressed via heterogeneous photocatalysis as witnessed recently. Herein, we have developed novel metal/semi-conductor/polymer nanocomposite for the catalyzed degradation and mineralization of a model organic dye pollutant in darkness. RuO2-TiO2 mixed oxide nanoparticles (NPs) were modified with diphenyl amino (DPA) groups from the 4-diphenylamine diazonium salt precursor. The latter was reduced with ascorbic acid to provide radicals that modified the NPs and further served for in situ synthesis of polyaniline (PANI) that resulted in RuO2/TiO2-DPA-PANI nanocomposite catalyst. Excellent adhesion of PANI to RuO2/TiO2-DPA was noted but not in the case of the bare mixed oxide. This stresses the central role of diazonium compounds to tether PANI to the underlying mixed oxide. RuO2-TiO2/DPA/PANI nanocomposite revealed superior catalytic properties in the degradation of Methyl Orange (MO) compared to RuO2-TiO2/PANI and RuO2-TiO2. Interestingly, it is active even in the darkness due to high PANI mass loading. In addition, PANI constitutes a protective layer of RuO2-TiO2 NPs that permitted us to reuse the RuO2-TiO2/DPA/PANI nanocomposite nine times, whereas RuO2-TiO2/PANI and RuO2-TiO2 were reused seven and five times only, respectively. The electronic displacements at the interface of the heterojunction metal/semi-conductor under visible light and the synergistic effects between PANI and RuO2 result in the separation of electron-hole pairs and a reduction of its recombination rate as well as a significant catalytic activity of RuO2-TiO2/DPA/PANI under simulated sunlight and in the dark, respectively. View Full-Text
Keywords: RuO2-TiO2; diazonium salt; polyaniline; nanocomposite; catalysis; darkness RuO2-TiO2; diazonium salt; polyaniline; nanocomposite; catalysis; darkness
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MDPI and ACS Style

Mousli, F.; Chaouchi, A.; Jouini, M.; Maurel, F.; Kadri, A.; Chehimi, M.M. Polyaniline-Grafted RuO2-TiO2 Heterostructure for the Catalysed Degradation of Methyl Orange in Darkness. Catalysts 2019, 9, 578.

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