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      Facile Green Synthesis of BiOBr Nanostructures with Superior Visible-Light-Driven Photocatalytic Activity

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          Abstract

          Novel green bismuth oxybromide (BiOBr-G) nanoflowers were successfully synthesized via facile hydrolysis route using an Azadirachta indica (Neem plant) leaf extract and concurrently, without the leaf extract (BiOBr-C). The Azadirachta indica leaf extract was employed as a sensitizer and stabilizer for BiOBr-G, which significantly expanded the optical window and boosted the formation of photogenerated charge carriers and transfer over the BiOBr-G surface. The photocatalytic performance of both samples was investigated for the degradation of methyl orange (MO) and phenol (Ph) under the irradiation of visible light. The leaf extract mediated BiOBr-G photocatalyst displayed significantly higher photocatalytic activity when compared to BiOBr-C for the degradation of both pollutants. The degradation rate of MO and Ph by BiOBr-G was found to be nearly 23% and 16% more when compared to BiOBr-C under visible light irradiation, respectively. The substantial increase in the photocatalytic performance of BiOBr-G was ascribed to the multiple synergistic effects between the efficient solar energy harvesting, narrower band gap, high specific surface area, porosity, and effective charge separation. Furthermore, BiOBr-G displayed high stability for five cycles of photocatalytic activity, which endows its practical application as a green photocatalyst in the long run.

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          Biosynthesis of zinc oxide nanoparticles from Azadirachta indica for antibacterial and photocatalytic applications

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            Bismuth oxyhalide nanomaterials: layered structures meet photocatalysis.

            In recent years, layered bismuth oxyhalide nanomaterials have received more and more interest as promising photocatalysts because their unique layered structures endow them with fascinating physicochemical properties; thus, they have great potential photocatalytic applications for environment remediation and energy harvesting. In this article, we explore the synthesis strategies and growth mechanisms of layered bismuth oxyhalide nanomaterials, and propose design principles of tailoring a layered configuration to control the nanoarchitectures for high efficient photocatalysis. Subsequently, we focus on their layered structure dependent properties, including pH-related crystal facet exposure and phase transformation, facet-dependent photoactivity and molecular oxygen activation pathways, so as to clarify the origin of the layered structure dependent photoreactivity. Furthermore, we summarize various strategies for modulating the composition and arrangement of layered structures to enhance the photoactivity of nanostructured bismuth oxyhalides via internal electric field tuning, dehalogenation effect, surface functionalization, doping, plasmon modification, and heterojunction construction, which may offer efficient guidance for the design and construction of high-performance bismuth oxyhalide-based photocatalysis systems. Finally, we highlight some crucial issues in engineering the layered-structure mediated properties of bismuth oxyhalide photocatalysts and provide tentative suggestions for future research on increasing their photocatalytic performance.
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              Facets coupling of BiOBr-g-C3N4 composite photocatalyst for enhanced visible-light-driven photocatalytic activity

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                Author and article information

                Journal
                Materials (Basel)
                Materials (Basel)
                materials
                Materials
                MDPI
                1996-1944
                24 July 2018
                August 2018
                : 11
                : 8
                : 1273
                Affiliations
                [1 ]Department of Chemistry, Amity Institute of Applied Sciences, Amity University, Sector-125, Noida 201313, Uttar Pradesh, India; yadavmohit27@ 123456gmail.com
                [2 ]Amity Institute of Nanotechnology, Amity University, Sector-125, Noida 201313, Uttar Pradesh, India
                [3 ]Amity Institute of Pharmacy, Amity University, Sector-125, Noida 201313, Uttar Pradesh, India; chandra.amrish@ 123456gmail.com
                [4 ]Department of Chemistry, Indian Institute of Technology, Delhi, Hauz Khas, New Delhi 110016, India; sapra@ 123456chemistry.iitd.ac.in (S.S.); soniyagh.iitd@ 123456gmail.com (S.G.); ppingole@ 123456chemistry.iitd.ac.in (P.P.I.)
                [5 ]Nanostructured Materials and Bio-Nano-Interfaces Center, Interdisciplinary Research Institute on Bio-Nano-Sciences, Babeș-Bolyai University, Cluj-Napoca 400271, Romania; militodea@ 123456yahoo.com (M.T.); k.pap.zsolt@ 123456gmail.com (Z.P.)
                [6 ]Department of Molecular Sciences, Faculty of Medicine, Iuliu Haţieganu University of Medicine and Pharmacy, Cluj-Napoca 400012, Romania
                [7 ]Department of Applied and Environmental Chemistry, University of Szeged, Rerrich tér 1, H-6720 Szeged, Hungary; bardosenci@ 123456gmail.com (E.B.); hernadi@ 123456chem.u-szeged.hu (K.H.)
                [8 ]Institute of Environmental Science and Technology, University of Szeged, Tisza Lajos krt. 103, H-6720 Szeged, Hungary
                Author notes
                [* ]Correspondence: sgarg2@ 123456amity.edu
                Author information
                https://orcid.org/0000-0002-0045-557X
                https://orcid.org/0000-0002-9755-4477
                https://orcid.org/0000-0002-8049-0809
                https://orcid.org/0000-0001-9419-689X
                Article
                materials-11-01273
                10.3390/ma11081273
                6117687
                30042360
                6cfb34af-c6dc-4240-bc03-d786268d7c68
                © 2018 by the authors.

                Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license ( http://creativecommons.org/licenses/by/4.0/).

                History
                : 02 July 2018
                : 20 July 2018
                Categories
                Article

                bismuth oxybromide,phenol,methyl orange,photocatalysis,hydrolysis

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