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Tab A, Dahmane M, Belabed C, Bellal B, Richard C, Trari M. High efficiency photocatalytic degradation of Ambroxol over Mn doped TiO 2: Experimental designs, identification of transformation products, mineralization and mechanism. THE SCIENCE OF THE TOTAL ENVIRONMENT 2021; 780:146451. [PMID: 33773343 DOI: 10.1016/j.scitotenv.2021.146451] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/18/2020] [Revised: 03/08/2021] [Accepted: 03/09/2021] [Indexed: 06/12/2023]
Abstract
Ambroxol (AMB) is a drug commonly used for chronic bronchitis prevention. Once released in surface water, this recalcitrant chemical becomes a hazardous pollutant. Here, we investigated the ability of 1% Mn-doped TiO2 (Mn-TiO2) to mineralize AMB by photocatalysis. We studied the morphology, and the physical and electrochemical properties of Mn-TiO2 using X-ray diffraction, Scanning electron microscopy, Transmission electron microscopy, X-ray fluorescence, BET method, UV-visible, and electrochemical study and optimized the AMB degrading experimental conditions through response surface methodology (RSM). Mn-TiO2 at the dose of 0.625 g·L-1 allowed the complete photodegradation of AMB (30 ppm) at pH 7 under UVA light irradiation for 30 min while total mineralization in CO2 (>96%) was achieved after 24 h of irradiation. Mn-TiO2 was 1.6-time more efficient than TiO2 Degussa P25. Product studies were also carried out by liquid chromatography coupled to electrospray high resolution mass spectrometry. Twenty-one photodegradation products were detected and identified. In addition, ionic chromatography analyses revealed the release of Br-, NH4+, and NO3- at respectively 97, 63 and 35% of the total Br, and N initially present in AMB. Finally, the reusability of the photocatalyst was also tested. After four cycles, the almost complete photodegradation of AMB was achieved showing that Mn-TiO2 was highly stable. This work brings new physical characteristics on Mn-TiO2 photocatalyst. Moreover, it is the first study investigating the photocatalytic degradation of recalcitrant AMB drug.
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Affiliation(s)
- Asma Tab
- Laboratory of Chromatography, Faculty of Chemistry, University of Science and Technology Houari Boumediène, BP 32 El-Alia, 16111 Algiers, Algeria; Université Clermont Auvergne, CNRS, SIGMA Clermont, ICCF, F-63000 Clermont-Ferrand, France
| | - Mohamed Dahmane
- Laboratory of Chromatography, Faculty of Chemistry, University of Science and Technology Houari Boumediène, BP 32 El-Alia, 16111 Algiers, Algeria
| | - Chemseddin Belabed
- Laboratory of Materials Physics, Faculty of Physics, University of Science and Technology Houari Boumediène, BP 32 El-Alia, 16111 Algiers, Algeria
| | - Bachir Bellal
- Laboratory of Storage and Valorization of Renewable Energies, Faculty of Chemistry, University of Science and Technology Houari Boumediène, BP 32 El-Alia, 16111 Algiers, Algeria
| | - Claire Richard
- Université Clermont Auvergne, CNRS, SIGMA Clermont, ICCF, F-63000 Clermont-Ferrand, France.
| | - Mohamed Trari
- Laboratory of Storage and Valorization of Renewable Energies, Faculty of Chemistry, University of Science and Technology Houari Boumediène, BP 32 El-Alia, 16111 Algiers, Algeria
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Koçyiğit A, Erdal MO, Ozel F, Yıldırım M. Photodiode behaviors of the AgSbS 2nanocrystals in a Schottky structure. NANOTECHNOLOGY 2021; 32:385204. [PMID: 34130261 DOI: 10.1088/1361-6528/ac0b64] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/08/2021] [Accepted: 06/15/2021] [Indexed: 06/12/2023]
Abstract
Cubic phase AgSbS2nanocrystals (NCs) were synthesized by the hot-injection method, and they were inserted between the Al andp-Si to fabricate Al/AgSbS2/p-Si photodiode by the thermal evaporation method. AgSbS2NCs were characterized by XRD, SEM and TEM instruments to confirm the crystal phase, surface morphology as well as crystalline size. The XRD pattern revealed that the cubic crystalline structure of the AgSbS2. The spherical shapes and well surface morphology were affirmed by SEM and TEM analysis. Al/AgSbS2/p-Si photodiode was characterized byI-Vmeasurements depending on the light power intensity and byC-Vmeasurement for various frequencies.I-Vcharacteristics revealed that the Al/AgSbS2/p-Si exhibited good photodiode behavior and a high rectifying ratio. Various diode and detector parameters were extracted fromI-Vmeasurements, and they were discussed in detail. TheC-Vcharacteristics highlighted that the Al/AgSbS2/p-Si photodiode showed voltage and frequency dependent profile at the accumulation region. The fabricated Al/AgSbS2/p-Si photodiode can be thought for optoelectronic applications.
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Affiliation(s)
- Adem Koçyiğit
- Igdir University, Engineering Faculty, Department of Electrical Electronic Engineering, 76000 Igdir, Turkey
- Department of Electronics and Automation, Vocational High School, Bilecik Şeyh Edebali University, 11230, Bilecik, Turkey
| | - Mehmet Okan Erdal
- Necmettin Erbakan University, Meram Vocational School, 42090, Konya, Turkey
| | - Faruk Ozel
- Karamanoğlu Mehmetbey University, Faculty of Engineering, Department of Metallurgical and Materials Engineering, 70200, Karaman, Turkey
- Karamanoglu Mehmetbey University, Scientific and Technological Research and Application Center, 70200, Karaman, Turkey
| | - Murat Yıldırım
- Selcuk University, Faculty of Science, Department of Biotechnology, 42130, Konya, Turkey
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Zhao S, Wu J, Xu Y, Zhang X, Han Y, Xing H. CdS/Ag 2S/g-C 3N 4 ternary composites with superior photocatalytic performance for hydrogen evolution under visible light irradiation. Dalton Trans 2021; 50:3253-3260. [PMID: 33586743 DOI: 10.1039/d0dt04292g] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
CdS/Ag2S/g-C3N4 ternary composites as photocatalysts with different amounts of Ag2S were successfully synthesized through a simple chemical deposition method. These photocatalysts were characterized by powder X-ray diffraction (PXRD), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy dispersive X-ray spectroscopy (EDX) mapping and X-ray photoelectron spectroscopy (XPS) to obtain the information of the structure and composition. Compared with the pure samples and binary composites, CdS/Ag2S/g-C3N4 ternary composites showed enhanced hydrogen production activities, and the maximum hydrogen production rate of CdS/Ag2S(2%)/CN is about 1020.54 μmol g-1 h-1 in Na2S-Na2SO3 solution. Based on the photoluminescence and electrochemical results, the improved photocatalytic activity could be attributed not only to the synergic effect of ternary components in the composite, but also to the introduction of Ag2S that provided abundant active sites for H2 production. A possible mechanism was investigated in detail.
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Affiliation(s)
- Shan Zhao
- Department of Chemistry, College of Science, Northeastern University, Shenyang, 110819, China.
| | - Junbiao Wu
- Department of Chemistry, College of Science, Northeastern University, Shenyang, 110819, China.
| | - Yan Xu
- Department of Chemistry, College of Science, Northeastern University, Shenyang, 110819, China.
| | - Xia Zhang
- Department of Chemistry, College of Science, Northeastern University, Shenyang, 110819, China.
| | - Yide Han
- Department of Chemistry, College of Science, Northeastern University, Shenyang, 110819, China.
| | - Hongzhu Xing
- Provincial Key Laboratory of Advanced Energy Materials, College of Chemistry, Northeast Normal University, 5268 Renmin Street, Changchun 130024, China.
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Abstract
Chalcogenides and chalcogenide-based heterostructures as photocatalysts.
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Affiliation(s)
- Ashmalina Rahman
- Chemical Sciences, Faculty of Science, Universiti Brunei Darussalam, Jalan Tungku Link, Gadong, BE 1410, Brunei Darussalam
| | - Mohammad Mansoob Khan
- Chemical Sciences, Faculty of Science, Universiti Brunei Darussalam, Jalan Tungku Link, Gadong, BE 1410, Brunei Darussalam
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Assessment of TiO2 band gap from structural parameters using artificial neural networks. J Photochem Photobiol A Chem 2021. [DOI: 10.1016/j.jphotochem.2020.112870] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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