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Palai A, Panda NR, Sahu D. Novel ZnO blended SnO2 nanocatalysts exhibiting superior degradation of hazardous pollutants and enhanced visible photoemission properties. J Mol Struct 2021. [DOI: 10.1016/j.molstruc.2021.131245] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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Bouddouch A, Amaterz E, Bakiz B, Taoufyq A, Guinneton F, Villain S, Gavarri JR, Ezahri M, Valmalette JC, Benlhachemi A. Role of thermal decomposition process in the photocatalytic or photoluminescence properties of BiPO 4 polymorphs. WATER ENVIRONMENT RESEARCH : A RESEARCH PUBLICATION OF THE WATER ENVIRONMENT FEDERATION 2020; 92:1874-1887. [PMID: 32301533 DOI: 10.1002/wer.1340] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/06/2019] [Revised: 12/05/2019] [Accepted: 04/11/2020] [Indexed: 06/11/2023]
Abstract
Thermal decomposition process was used to obtain modified photocatalytic and/or photoluminescence properties of bismuth phosphate polymorphs. The precursor BiPO4 , 0.7H2 O was synthesized by a coprecipitation route. The observed polymorphs were the hexagonal P31 21 hydrate phase BiPO4 , 0.7H2 O at 25°C, a mix system of hexagonal and monoclinic P21 /n phases at 200°C and 400°C, a mix system of monoclinic phases P21 /n and P21 /m at 600°C, and a unique monoclinic phase P21 /m at 900°C. The X-ray diffraction analyses allowed evidencing lattice deformations due to structural defects. The photocatalytic activities in the presence of rhodamine B in aqueous solution were determined using UV light irradiation. The best photocatalytic efficiencies were observed with the mix systems resulting from thermal decomposition at 400 and 600°C. Photoluminescence experiments performed under UV-laser light irradiation revealed unexpected emissions in the green-orange range, with optimal intensities for the mix systems observed at 400°C. The role of structural defects resulting from decomposition process is discussed. PRACTITIONER POINTS: Thermal decomposition is used to introduce structural defects in BiPO4 polymorphs The BiPO4 intermediate systems are used to photodegrade rhodamine B Active species trapping experiments are performed Photoluminescence experiments highlight green-orange emissions Structural defects are at the origin of this photoluminescence.
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Affiliation(s)
- Abdessalam Bouddouch
- Laboratoire Matériaux et Environnement (LME), Faculté des Sciences, Université Ibn Zohr, Agadir, Maroc
- CNRS 7334, IM2NP, BP 20132, Université de Toulon, Aix Marseille University, La Garde Cedex, France
| | - Elhassan Amaterz
- Laboratoire Matériaux et Environnement (LME), Faculté des Sciences, Université Ibn Zohr, Agadir, Maroc
- Laboratoire d'Ingenierie et Sciences des Matériaux (LISM), UFR Sciences BP 1039, Université de Champagne-Ardenne, Reims, France
| | - Bahcine Bakiz
- Laboratoire Matériaux et Environnement (LME), Faculté des Sciences, Université Ibn Zohr, Agadir, Maroc
| | - Aziz Taoufyq
- Laboratoire Matériaux et Environnement (LME), Faculté des Sciences, Université Ibn Zohr, Agadir, Maroc
| | - Frédéric Guinneton
- CNRS 7334, IM2NP, BP 20132, Université de Toulon, Aix Marseille University, La Garde Cedex, France
| | - Sylvie Villain
- CNRS 7334, IM2NP, BP 20132, Université de Toulon, Aix Marseille University, La Garde Cedex, France
| | - Jean-Raymond Gavarri
- CNRS 7334, IM2NP, BP 20132, Université de Toulon, Aix Marseille University, La Garde Cedex, France
| | - Mohmad Ezahri
- Laboratoire Matériaux et Environnement (LME), Faculté des Sciences, Université Ibn Zohr, Agadir, Maroc
| | | | - Abdeljalil Benlhachemi
- Laboratoire Matériaux et Environnement (LME), Faculté des Sciences, Université Ibn Zohr, Agadir, Maroc
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Samata H, Kobayashi K, Hanioka M, Ozawa TC. Fluorescence quantum yield of Gd0.9?xRxEu0.1OOH (R=Y, La) crystals. J RARE EARTH 2015. [DOI: 10.1016/s1002-0721(14)60554-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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