In the present work, we report the synthesis of inorganic-organic hybrid material of molecular formula ((C4H9)4N)2[H3(Fe(C5H5)2)2PW11O39] � 7H2O abbreviated as TBAFcPW11. This hybrid material has large surface area (142 m2 g−1) and shows photocatalytic activity due to the synergistic effect of photoexcitation property of polyoxometalate cluster and Fe2+/Fe3+ redox pair. It is a floating hybrid photocatalytic material capable of remediating organic pollutants, rhodamine B and p-nitrophenol. Optimum conditions for photocatalytic degradation and extent of mineralization have been established by varying the reaction conditions and mineralization studies. © 2019 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim

Gangavarapu Ranga Rao

Department Of Chemistry

Sruthi Guru

IIT Madras is a public technical and research university located in Chennai, Tamil Nadu. Founded in 1959, it is recognised as an Institute of National Importance.

IIT Madras has been ranked as the top engineering institute in India for four years in a row by the National Institutional Ranking Framework of the MHRD

It currently offers undergraduate, postgraduate and research degrees across 16 disciplines in Engineering, Sciences, Humanities and Management. About 596 faculty belonging to science and engineering departments and centres of the Institute are engaged in teaching, research and industrial consultancy.

IIT Madras

ChemistrySelect

Novel multiwalled carbon nanotubes-graphene-TiO2 (CNT-GR-TiO2) composite materials without noble metal co-catalysts are designed for photocatalytic decomposition of water using solar light. The CNT-GR-TiO2 nanocomposite shows the highest H2 production rate of 29 mmol h−1g−1 under the full spectrum of solar light irradiation. The rate of H2 production is 8-fold higher than the commercial TiO2 (Degussa P25) and the estimated solar energy conversion efficiency is 14.6%. Spectroscopic and photocatalytic studies reveal that graphene acts as an electron reservoir through which interfacial charge transfer occurs for water splitting. The UV-Vis-DRS study shows that the absorption peak maximum for anatase TiO2 occurs at ∼315 nm, which is shifted to ∼355 nm and 380 nm for GR-TiO2 and CNT-GR-TiO2 composites, respectively. The EPR spectra of GR-TiO2 and CNT-GR-TiO2 composites indicate that graphene and multiwalled carbon nanotubes in the composites promote the generation of Ti3+ and oxygen vacancies and in turn reduce the band gap of anatase TiO2 from 3.32 eV to 2.79 eV. This is corroborated by XPS and photoluminescence analyses of the samples. The role of CNTs is to prevent the restacking of graphene nanosheets and provide additional electron transport channels thereby suppressing the recombination rate of electron-hole pairs in the CNT-GR-TiO2 composite. The combination of all these factors results in increasing the hydrogen production rate from 19 mmol h−1 g−1 (anatase TiO2) to 22 mmol h−1 g−1 (GR-TiO2) to 29 mmol h−1 g−1 (CNT-GR-TiO2). © 2017 Elsevier B.V.

Catalysis Today

Highly active and stable multi-walled carbon nanotubes-graphene-TiO2 nanohybrid: An efficient non-noble metal photocatalyst for water splitting

In situ loading of mono and bimetallic nanoparticles in the framework of mesoporous Al2O3-MCM-41 and its effect on the photo-Fenton degradation of dyes and mixed dyes has been reported in the present study. The nanocomposites are synthesized by in situ sol-gel cum hydrothermal method where oleic acid has been used as capping agent for mono and bimetallic nanoparticles. Materials were characterized by high and low angle XRD, N2 sorption, and HRTEM to evaluate mesoporosity, morphology and textural properties. The photoluminescence (PL) study and band gap energy measurement reveals suppression of e- and h+ recombination and semiconductor behaviour of bimetallic/Al2O3-MCM-41 in visible region. Both the processes of photo-Fenton and photocatalysis takes place over mesoporous Co-Fe/Al2O3-MCM-41 nanocomposite, which is found to be an efficient material with 100% efficiency for the degradation of dyes and mixed dyes (100 mg L-1) at pH 10 in just 60 minutes. Framework mesoporosity, nanoparticle morphology of the nanocomposite, semiconductor behavior, lowering of the electron-hole recombination and the formation of a large number of OH radicals are the crucial factors for swift degradation of dyes and mixed dyes by mesoporous Co-Fe/Al2O3-MCM-41 nanocomposite. © 2016 The Royal Society of Chemistry.

RSC Advances

Enhanced photodegradation of dyes and mixed dyes by heterogeneous mesoporous Co-Fe/Al2O3-MCM-41 nanocomposites: Nanoparticles formation, semiconductor behavior and mesoporosity

Journal of Photochemistry and Photobiology A: Chemistry

Integration of carbon dots and polyaniline with TiO2 nanoparticles: Substantially enhanced photocatalytic activity to removal various pollutants under visible light

Journal	Data powered by TypesetChemistrySelect
Publisher	Data powered by TypesetWiley-Blackwell
ISSN	23656549
Open Access	No