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Abreu-Jaureguí C, Andronic L, Sepúlveda-Escribano A, Silvestre-Albero J. Improved photocatalytic performance of TiO 2/carbon photocatalysts: Role of carbon additive. ENVIRONMENTAL RESEARCH 2024; 251:118672. [PMID: 38508360 DOI: 10.1016/j.envres.2024.118672] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/24/2023] [Revised: 02/26/2024] [Accepted: 03/09/2024] [Indexed: 03/22/2024]
Abstract
A series of TiO2 - based photocatalysts have been prepared by the incorporation of 10 wt% of various carbon-based nanomaterials as modifying agents to titania. More specifically, commercial TiO2 P25 was modified through a wet impregnation approach with methanol with four different carbon nanostructures: single-walled carbon nanotubes (SWCNTs), partially reduced graphene oxide (prGO), graphite (GI), and graphitic carbon nitride (gCN). Characterization results (XPS and Raman) anticipate the occurrence of important interfacial phenomena, preferentially for samples TiO2/SWCNT and TiO2/prGO, with a binding energy displacement in the Ti 2p contribution of 1.35 eV and 1.54 eV, respectively. These findings could be associated with an improved electron-hole mobility at the carbon/oxide interface. Importantly, these two samples constitute the most promising photocatalysts for Rhodamine B (RhB) photodegradation, with nearly 100% conversion in less than 2 h. These promising results must be associated with intrinsic physicochemical changes at the formed heterojunction structure and the potential dual-role of the composites able to adsorb and degrade RhB simultaneously. Cyclability tests confirm the improved performance of the composites (e.g., TiO2/SWCNT, 100% degradation in 1 h) due to the combined adsorption/degradation ability, although the regeneration after several cycles is not complete due to partial blocking of the inner cavities in the carbon nanotubes by non-reacted RhB. Under these reaction conditions, Rhodamine-B xanthene dye degrades via the de-ethylation route.
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Affiliation(s)
- C Abreu-Jaureguí
- Laboratorio de Materiales Avanzados, Departamento de Química Inorgánica - Instituto Universitario de Materiales, Universidad de Alicante, Spain
| | - L Andronic
- Product Design, Mechatronics and Environment Department, Transilvania University of Brasov, Romania
| | - A Sepúlveda-Escribano
- Laboratorio de Materiales Avanzados, Departamento de Química Inorgánica - Instituto Universitario de Materiales, Universidad de Alicante, Spain
| | - J Silvestre-Albero
- Laboratorio de Materiales Avanzados, Departamento de Química Inorgánica - Instituto Universitario de Materiales, Universidad de Alicante, Spain.
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2
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Kubiak A, Fuks H, Szymczyk A, Frankowski M, Cegłowski M. Development of a novel LED-IoT photoreactor for enhanced removal of carbamazepine waste driven by solar energy. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2024; 362:121331. [PMID: 38833931 DOI: 10.1016/j.jenvman.2024.121331] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/09/2024] [Revised: 04/22/2024] [Accepted: 05/30/2024] [Indexed: 06/06/2024]
Abstract
This study introduces an innovative LED-IoT photoreactor, representing a significant advancement in response to the demand for sustainable water purification. The integration of LED-IoT installations addresses the challenge of intermittent sunlight availability, employing LEDs with a spectrum mimicking natural sunlight. Passive Infra-Red (PIR) sensors and Internet of things (IoT) technology ensure consistent radiation intensity, with the LED deactivating in ample sunlight and activating in its absence. Utilizing a visible light-absorbing photocatalyst developed through sol-gel synthesis and mild-temperature calcination, this research demonstrates a remarkable carbamazepine removal efficiency exceeding 95% under LED-IoT system illumination, compared to less than 90% efficiency with sunlight alone, within a 6-h exposure period. Moreover, the designed photocatalytic system achieves over 60% mineralization of carbamazepine after 12 h. Notably, the photocatalyst demonstrated excellent stability with no performance loss during five further cycles. Furthermore, integration with renewable energy sources facilitated continuous operation beyond daylight hours, enhancing the system's applicability in real-world water treatment scenarios. A notable application of the LED-IoT system at an operating sewage treatment plant showed nearly 80% efficiency in carbamazepine removal from sewage in the secondary settling tank after 6 h of irradiation, coupled with nearly 40% mineralization efficiency. Additionally, physicochemical analyses such as XPS and STA-FTIR confirm that the carbamazepine photooxidation process does not affect the surface of the photocatalyst, showing no adsorption for degradation products.
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Affiliation(s)
- Adam Kubiak
- Adam Mickiewicz University, Poznan, Faculty of Chemistry, Uniwersytetu Poznanskiego 8, PL-61614, Poznan, Poland.
| | - Hubert Fuks
- Faculty of Mechanical Engineering and Mechatronics, West Pomeranian University of Technology, Al. Piastów 19, PL-70310, Szczecin, Poland
| | - Anna Szymczyk
- Faculty of Mechanical Engineering and Mechatronics, West Pomeranian University of Technology, Al. Piastów 19, PL-70310, Szczecin, Poland
| | - Marcin Frankowski
- Adam Mickiewicz University, Poznan, Faculty of Chemistry, Uniwersytetu Poznanskiego 8, PL-61614, Poznan, Poland
| | - Michał Cegłowski
- Adam Mickiewicz University, Poznan, Faculty of Chemistry, Uniwersytetu Poznanskiego 8, PL-61614, Poznan, Poland
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3
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An HR, Lim C, Min CG, Son B, Kim CY, Park JI, Kim JP, Jeong Y, Seo J, Lee M, Park J, Lee YS, Lee HU. Highly visible-light-active sulfur and carbon co-doped TiO 2 (SC-TiO 2) heterogeneous photocatalysts prepared by underwater discharge plasma. CHEMOSPHERE 2024; 355:141859. [PMID: 38561161 DOI: 10.1016/j.chemosphere.2024.141859] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/10/2024] [Revised: 03/21/2024] [Accepted: 03/28/2024] [Indexed: 04/04/2024]
Abstract
To promptly and simply create highly crystalline S/C co-doped TiO2 (SC-TiO2) photocatalysts at room temperature and atmospheric pressure, we suggest a novel plasma-assisted sol-gel synthesis method. This method is a simultaneous synthetic process, in which an underwater plasma undergoes continuous reactions to generate high-energy atomic and molecular species that enable TiO2 to achieve crystallinity, a large surface area, and a heterogeneous structure within a few minutes. In particular, it was demonstrated that the heterogeneously structured TiO2 was formed by doping that sulfur and carbon replace O or Ti atoms in the TiO2 lattice depending on the composition of the synthesis solution during underwater plasma treatment. The resultant SC-TiO2 photocatalysts had narrowed bandgap energies and extended optical absorption scope into the visible range by inducing the intermediate states within bandgap due to generation of oxygen vacancies on the surface of TiO2 through synthesis, crystallization, and doping. Correspondingly, SC-TiO2 showed a significant degradation efficiency ([k] = 6.91 h-1) of tetracycline (TC, antibiotics) under solar light irradiation, up to approximately 4 times higher compared to commercial TiO2 ([k] = 1.68 h-1), resulting in great water purification. Therefore, we anticipate that this underwater discharge plasma system will prove to be an advantageous technique for producing heterostructural TiO2 photocatalysts with superior photocatalytic efficiency for environmental applications.
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Affiliation(s)
- Ha-Rim An
- Division of Material Analysis and Research, Korea Basic Science Institute, Daejeon, 34133, Republic of Korea
| | - Chaehun Lim
- Department of Chemical Engineering and Applied Chemistry, Chungnam National University, Daejeon, 34134, Republic of Korea
| | - Chung Gi Min
- Department of Chemical Engineering and Applied Chemistry, Chungnam National University, Daejeon, 34134, Republic of Korea
| | - Byoungchul Son
- Division of Material Analysis and Research, Korea Basic Science Institute, Daejeon, 34133, Republic of Korea
| | - Chang-Yeon Kim
- Division of Material Analysis and Research, Korea Basic Science Institute, Daejeon, 34133, Republic of Korea
| | - Ji-In Park
- Division of Material Analysis and Research, Korea Basic Science Institute, Daejeon, 34133, Republic of Korea
| | - Jong Pil Kim
- Busan Center, Korea Basic Science Institute, Busan, 46241, Republic of Korea
| | - Yesul Jeong
- Busan Center, Korea Basic Science Institute, Busan, 46241, Republic of Korea
| | - Jiwon Seo
- Division of Material Analysis and Research, Korea Basic Science Institute, Daejeon, 34133, Republic of Korea
| | - Moonsang Lee
- Department of Materials Science and Engineering, Inha University, Incheon, 22212, Republic of Korea
| | - Jihyang Park
- Department of Materials Science and Engineering, Inha University, Incheon, 22212, Republic of Korea
| | - Young-Seak Lee
- Department of Chemical Engineering and Applied Chemistry, Chungnam National University, Daejeon, 34134, Republic of Korea; Institute of Carbon Fusion Technology (InCFT), Chungnam National University, Daejeon, 34134, Republic of Korea.
| | - Hyun Uk Lee
- Division of Material Analysis and Research, Korea Basic Science Institute, Daejeon, 34133, Republic of Korea.
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4
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Ali S, Ismail PM, Khan M, Dang A, Ali S, Zada A, Raziq F, Khan I, Khan MS, Ateeq M, Khan W, Bakhtiar SH, Ali H, Wu X, Shah MIA, Vinu A, Yi J, Xia P, Qiao L. Charge transfer in TiO 2-based photocatalysis: fundamental mechanisms to material strategies. NANOSCALE 2024; 16:4352-4377. [PMID: 38275275 DOI: 10.1039/d3nr04534j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/27/2024]
Abstract
Semiconductor-based photocatalysis has attracted significant interest due to its capacity to directly exploit solar energy and generate solar fuels, including water splitting, CO2 reduction, pollutant degradation, and bacterial inactivation. However, achieving the maximum efficiency in photocatalytic processes remains a challenge owing to the speedy recombination of electron-hole pairs and the limited use of light. Therefore, significant endeavours have been devoted to addressing these issues. Specifically, well-designed heterojunction photocatalysts have been demonstrated to exhibit enhanced photocatalytic activity through the physical distancing of electron-hole pairs generated during the photocatalytic process. In this review, we provide a systematic discussion ranging from fundamental mechanisms to material strategies, focusing on TiO2-based heterojunction photocatalysts. Current efforts are focused on developing heterojunction photocatalysts based on TiO2 for a variety of photocatalytic applications, and these projects are explained and assessed. Finally, we offer a concise summary of the main insights and challenges in the utilization of TiO2-based heterojunction photocatalysts for photocatalysis. We expect that this review will serve as a valuable resource to improve the efficiency of TiO2-based heterojunctions for energy generation and environmental remediation.
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Affiliation(s)
- Sharafat Ali
- Yangtze Delta Region Institute (Huzhou), University of Electronic Science and Technology, Huzhou 313001, China
- School of Physics, University of Electronic Science and Technology of China, Chengdu 610054, PR China.
| | - Pir Muhammad Ismail
- Yangtze Delta Region Institute (Huzhou), University of Electronic Science and Technology, Huzhou 313001, China
- School of Physics, University of Electronic Science and Technology of China, Chengdu 610054, PR China.
| | - Muhammad Khan
- Shannxi Engineering Laboratory for Graphene New Carbon Materials and Applications, School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an 710072, PR China
| | - Alei Dang
- Shannxi Engineering Laboratory for Graphene New Carbon Materials and Applications, School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an 710072, PR China
| | - Sajjad Ali
- Yangtze Delta Region Institute (Huzhou), University of Electronic Science and Technology, Huzhou 313001, China
- Energy, Water and Environment Lab, College of Humanities and Sciences, Prince Sultan University, Riyadh 11586, Saudi Arabia
| | - Amir Zada
- Department of Chemistry, Abdul Wali Khan University Mardan, Khyber Pakhtunkhwa, 23200, Pakistan.
| | - Fazal Raziq
- School of Physics, University of Electronic Science and Technology of China, Chengdu 610054, PR China.
| | - Imran Khan
- School of Physics and Electronics, Hunan Key Laboratory for Super-microstructure and Ultrafast Process, Central South University, Changsha, 410083, People's Republic of China
| | - Muhammad Shakeel Khan
- Department of Chemistry, Abdul Wali Khan University Mardan, Khyber Pakhtunkhwa, 23200, Pakistan.
| | - Muhammad Ateeq
- Department of Chemistry, Abdul Wali Khan University Mardan, Khyber Pakhtunkhwa, 23200, Pakistan.
| | - Waliullah Khan
- Department of Chemistry, Abdul Wali Khan University Mardan, Khyber Pakhtunkhwa, 23200, Pakistan.
| | - Syedul Hasnain Bakhtiar
- School of Integrated Circuits, Wuhan National Laboratory for Optoelectronics, Engineering Research Center for Functional Ceramics of the Ministry of Education, Huazhong University of Science and Technology, Wuhan 430074, PR China
| | - Haider Ali
- School of Physics, University of Electronic Science and Technology of China, Chengdu 610054, PR China.
| | - Xiaoqiang Wu
- School of Mechanical Engineering, Chengdu University, Chengdu 610106, China
| | - Muhammad Ishaq Ali Shah
- Department of Chemistry, Abdul Wali Khan University Mardan, Khyber Pakhtunkhwa, 23200, Pakistan.
| | - Ajayan Vinu
- Global Innovative Centre for Advanced Nanomaterials, School of Engineering, The University of Newcastle, Callaghan, NSW 2308, Australia
| | - Jiabao Yi
- Global Innovative Centre for Advanced Nanomaterials, School of Engineering, The University of Newcastle, Callaghan, NSW 2308, Australia
| | - Pengfei Xia
- Yangtze Delta Region Institute (Huzhou), University of Electronic Science and Technology, Huzhou 313001, China
- School of Physics, University of Electronic Science and Technology of China, Chengdu 610054, PR China.
| | - Liang Qiao
- Yangtze Delta Region Institute (Huzhou), University of Electronic Science and Technology, Huzhou 313001, China
- School of Physics, University of Electronic Science and Technology of China, Chengdu 610054, PR China.
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5
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Rios C, Bazán-Díaz L, Celaya CA, Salcedo R, Thangarasu P. Synthesis and Characterization of a Photocatalytic Material Based on Raspberry-like SiO 2@TiO 2 Nanoparticles Supported on Graphene Oxide. Molecules 2023; 28:7331. [PMID: 37959751 PMCID: PMC10647393 DOI: 10.3390/molecules28217331] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2023] [Revised: 10/20/2023] [Accepted: 10/26/2023] [Indexed: 11/15/2023] Open
Abstract
A raspberry-like SiO2@TiO2 new material supported on functionalized graphene oxide was prepared to reduce titania's band gap value. The material was characterized through different analytical methods such as Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and high-resolution transmission electron microscopy (HR-TEM). The band gap value was studied via UV-Vis absorption spectra and determined through the Kubelka-Munk equation. A theoretical study was also carried out to analyze the interaction between the species.
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Affiliation(s)
- Citlalli Rios
- Facultad de Química, Circuito Escolar s/n, Ciudad Universitaria, Universidad Nacional Autónoma de México, Coyoacán, Ciudad de México 04510, Mexico;
| | - L. Bazán-Díaz
- Instituto de Investigaciones en Materiales, Circuito Exterior s/n, Ciudad Universitaria, Universidad Nacional Autónoma de México, Coyoacán, Ciudad de México 04510, Mexico; (L.B.-D.); (R.S.)
| | - Christian A. Celaya
- Centro de Nanociencias y Nanotecnología, Universidad Nacional Autónoma de México, Km 107 CarreteraTijuana-Ensenada, Ensenada 22800, Mexico;
| | - Roberto Salcedo
- Instituto de Investigaciones en Materiales, Circuito Exterior s/n, Ciudad Universitaria, Universidad Nacional Autónoma de México, Coyoacán, Ciudad de México 04510, Mexico; (L.B.-D.); (R.S.)
| | - Pandiyan Thangarasu
- Facultad de Química, Circuito Escolar s/n, Ciudad Universitaria, Universidad Nacional Autónoma de México, Coyoacán, Ciudad de México 04510, Mexico;
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6
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Yadav S, Shakya K, Gupta A, Singh D, Chandran AR, Varayil Aanappalli A, Goyal K, Rani N, Saini K. A review on degradation of organic dyes by using metal oxide semiconductors. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2023; 30:71912-71932. [PMID: 35595896 DOI: 10.1007/s11356-022-20818-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/14/2022] [Accepted: 05/10/2022] [Indexed: 06/14/2023]
Abstract
The discharge of organic dye pollutants in natural water bodies has put forward a big challenge of providing clean water to a large part of the population. As the population is increasing with time, only underground water is not sufficient to complete the water requirements of everyone everywhere. Purification of wastewater and its reuse is the only way to fulfill the water needs. Nanotechnology has been used very efficiently for wastewater treatment via photocatalytic degradation of dye molecules. In the past few years, a lot of investigations have been done to enhance the photocatalytic activity of metal oxide semiconductors for water purification. In this review, we have discussed the different methods of synthesis of various metal oxide semiconductor nanoparticles, energy band gap, their role as efficient photocatalysts, radiations used for photocatalytic reactions, and their degradation efficiency to degrade the dye pollutants. We have also discussed the nanocomposites of metal oxide with graphene. These nanocomposites have been utilized as the efficient photocatalyst due to unique characteristics of graphene such as extended range of light absorption, separation of charges, and high capacity of adsorption of the dye pollutants.
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Affiliation(s)
- Sapna Yadav
- Department of Chemistry, Miranda House, University of Delhi, New Delhi-110007, India
| | - Kriti Shakya
- Department of Chemistry, Miranda House, University of Delhi, New Delhi-110007, India
| | - Aarushi Gupta
- Department of Chemistry, Miranda House, University of Delhi, New Delhi-110007, India
| | - Divya Singh
- Department of Chemistry, Miranda House, University of Delhi, New Delhi-110007, India
| | - Anjana R Chandran
- Department of Chemistry, Miranda House, University of Delhi, New Delhi-110007, India
| | | | - Kanika Goyal
- Department of Chemistry, Miranda House, University of Delhi, New Delhi-110007, India
| | - Nutan Rani
- Department of Chemistry, Miranda House, University of Delhi, New Delhi-110007, India
| | - Kalawati Saini
- Department of Chemistry, Miranda House, University of Delhi, New Delhi-110007, India.
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7
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Assadi AA, Baaloudj O, Khezami L, Ben Hamadi N, Mouni L, Assadi AA, Ghorbal A. An Overview of Recent Developments in Improving the Photocatalytic Activity of TiO 2-Based Materials for the Treatment of Indoor Air and Bacterial Inactivation. MATERIALS (BASEL, SWITZERLAND) 2023; 16:2246. [PMID: 36984127 PMCID: PMC10056653 DOI: 10.3390/ma16062246] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/25/2022] [Revised: 02/25/2023] [Accepted: 02/27/2023] [Indexed: 06/18/2023]
Abstract
Indoor air quality has become a significant public health concern. The low cost and high efficiency of photocatalytic technology make it a natural choice for achieving deep air purification. Photocatalysis procedures have been widely investigated for environmental remediation, particularly for air treatment. Several semiconductors, such as TiO2, have been used for photocatalytic purposes as catalysts, and they have earned a lot of interest in the last few years owing to their outstanding features. In this context, this review has collected and discussed recent studies on advances in improving the photocatalytic activity of TiO2-based materials for indoor air treatment and bacterial inactivation. In addition, it has elucidated the properties of some widely used TiO2-based catalysts and their advantages in the photocatalytic process as well as improved photocatalytic activity using doping and heterojunction techniques. Current publications about various combined catalysts have been summarized and reviewed to emphasize the significance of combining catalysts to increase air treatment efficiency. Besides, this paper summarized works that used these catalysts to remove volatile organic compounds (VOCs) and microorganisms. Moreover, the reaction mechanism has been described and summarized based on literature to comprehend further pollutant elimination and microorganism inactivation using photocatalysis. This review concludes with a general opinion and an outlook on potential future research topics, including viral disinfection and other hazardous gases.
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Affiliation(s)
- Achraf Amir Assadi
- Center for Research on Microelectronics and Nanotechnology, CRMN Sousse Techno Park, Sahloul BP 334, Sousse 4054, Tunisia
- Research Unit Advanced Materials, Applied Mechanics, Innovative Processes and Environment, Higher Institute of Applied Sciences and Technology of Gabes (ISSAT), University of Gabes, Gabes 6029, Tunisia
| | - Oussama Baaloudj
- Laboratory of Reaction Engineering, Faculty of Mechanical Engineering and Process Engineering, Université des Sciences et de la Technologie Houari Boumediene, BP 32, Algiers 16111, Algeria
- Laboratory of Advanced Materials for Energy and Environment, Université du Québec à Trois-Rivières (UQTR), 3351, Boul. des Forges, C.P. 500, Trois-Rivières, QC G9A 5H7, Canada
| | - Lotfi Khezami
- Chemistry Department, College of Science, Imam Mohammad Ibn Saud Islamic University (IMSIU), Riyadh 11432, Saudi Arabia
| | - Naoufel Ben Hamadi
- Chemistry Department, College of Science, Imam Mohammad Ibn Saud Islamic University (IMSIU), Riyadh 11432, Saudi Arabia
| | - Lotfi Mouni
- Laboratoire de Gestion et Valorisation des Ressources Naturelles et Assurance Qualité, Faculté SNVST, Université Bouira, Bouira 10000, Algeria
| | - Aymen Amine Assadi
- École Nationale Supérieure de Chimie de Rennes (ENSCR), Université de Rennes, UMR CNRS 6226, 11 Allée de Beaulieu, 35700 Rennes, France
| | - Achraf Ghorbal
- Research Unit Advanced Materials, Applied Mechanics, Innovative Processes and Environment, Higher Institute of Applied Sciences and Technology of Gabes (ISSAT), University of Gabes, Gabes 6029, Tunisia
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8
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Derakhshani M, Amini MM. Phase control and induction of visible-light photocatalytic activity in hierarchical porous structure nanocrystalline TiO2 prepared using a MOF-5-derived nanoporous carbon template. J Taiwan Inst Chem Eng 2023. [DOI: 10.1016/j.jtice.2023.104718] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
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9
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Fatima S, Ceesay AS, Khan MS, Sarwar R, Bilal M, Uddin J, Ul-Hamid A, Khan A, Riaz N, Al-Harrasi A. Visible Light-Induced Reactive Yellow 145 Discoloration: Structural and Photocatalytic Studies of Graphene Quantum Dot-Incorporated TiO 2. ACS OMEGA 2023; 8:3007-3016. [PMID: 36713734 PMCID: PMC9878638 DOI: 10.1021/acsomega.2c05805] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/07/2022] [Accepted: 11/14/2022] [Indexed: 06/18/2023]
Abstract
Visible light-induced photocatalytic treatment of organic waste is considered a green and efficient route. This study explored the structural and photocatalytic performance of graphene quantum dot (GQD)-incorporated TiO2 nanocomposites to treat reactive yellow 145 (RY145) dye. For the effective removal of the RY145, efforts were made to better understand the kinetics of the process and optimization of the treatment parameters. Different GQD-doped TiO2 nanocomposites were synthesized employing the sol-gel method. Physicochemical characteristics of the synthesized nanocomposites were studied through FTIR, XRD, UV-visible spectroscopy, SEM, and EDX. Screening studies were conducted for synthesis and reaction optimization. The results indicated that GQD-TiO2 significantly enhanced the photocatalytic discoloration for RY145 dye. Among the synthesized nanocomposites, 15GQD-TiO2 calcined at 300 exhibited 99.3% RY145 discoloration in 30 min under visible light irradiation. Following the pseudo-first-order reaction, the photocatalytic reaction constant K app progressively declined with an increase in the concentration of RY145. The heterogeneous reaction system conformed to the Langmuir-Hinshelwood isotherm, as indicated by the K C (1.08 mg L-1 min-1) and the K LH (0.18 L mg-1) values. O2 •- was found to be the major contributor in GQD-TiO2-300 to decolorize RY154, while TiO2 and GQDs played a vital role in generation of electrons and holes. Additionally, after recycling to the seventh cycle, only 9% decline in photocatalytic performance was observed for the synthesized nanocomposite.
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Affiliation(s)
- Syeda
Kinza Fatima
- Department
of Environmental Sciences, COMSATS University
Islamabad, Abbottabad Campus, 22020Abbottabad, Pakistan
| | - Ansumana Sangi Ceesay
- Department
of Environmental Sciences, COMSATS University
Islamabad, Abbottabad Campus, 22020Abbottabad, Pakistan
- Department
of Water Resources, Water Quality Laboratory, 7 Marina Parade, 00220Banjul, The
Gambia
| | - Muhammad Saqib Khan
- Department
of Environmental Sciences, COMSATS University
Islamabad, Abbottabad Campus, 22020Abbottabad, Pakistan
| | - Rizwana Sarwar
- Department
of Chemistry, COMSATS University Islamabad, Abbottabad Campus, 22020Abbottabad, Pakistan
| | - Muhammad Bilal
- Department
of Environmental Sciences, COMSATS University
Islamabad, Abbottabad Campus, 22020Abbottabad, Pakistan
| | - Jalal Uddin
- Department
of Pharmaceutical Chemistry, College of Pharmacy, King Khalid University, 62529Abha, Kingdom of Saudi Arabia
| | - Anwar Ul-Hamid
- Centre
for
Engineering Research, King Fahd University
of Petroleum and Minerals, 31261Dhahran, Saudi Arabia
| | - Ajmal Khan
- Natural
and Medical Sciences Research Center, University
of Nizwa, 616Nizwa, Sultanate of Oman
| | - Nadia Riaz
- Department
of Environmental Sciences, COMSATS University
Islamabad, Abbottabad Campus, 22020Abbottabad, Pakistan
| | - Ahmed Al-Harrasi
- Natural
and Medical Sciences Research Center, University
of Nizwa, 616Nizwa, Sultanate of Oman
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10
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Kim YE, Byun MY, Lee KY, Lee MS. Hydrothermal synthesis of mesoporous TiO2 using β-diketonate stabilizing agents for photocatalytic degradation of methyl violet 2B under visible light. Catal Today 2022. [DOI: 10.1016/j.cattod.2022.11.015] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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11
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Sharmin F, Basith MA. Simple Low Temperature Technique to Synthesize Sillenite Bismuth Ferrite with Promising Photocatalytic Performance. ACS OMEGA 2022; 7:34901-34911. [PMID: 36211068 PMCID: PMC9535739 DOI: 10.1021/acsomega.2c03457] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/02/2022] [Accepted: 09/09/2022] [Indexed: 06/16/2023]
Abstract
Sillenite-type members of the bismuth ferrite family have demonstrated outstanding potential as novel photocatalysts in environmental remediation such as organic pollutant degradation. This investigation has developed a low temperature one-step hydrothermal technique to fabricate sillenite bismuth ferrite Bi25FeO40 (S-BFO) via co-substitution of 10% Gd and 10% Cr in Bi and Fe sites of BiFeO3, respectively, by tuning hydrothermal reaction temperatures. Rietveld refined X-ray diffraction patterns of the as-synthesized powder materials revealed the formation of S-BFO at a reaction temperature of 120-160 °C. A further increase in the reaction temperature destroyed the desired sillenite structure. With the increase in the reaction temperature from 120 to 160 °C, the morphology of S-BFO gradually changed from irregular shape to spherical powder nanomaterials. The high-resolution TEM imaging demonstrated the polycrystalline nature of the S-BFO(160) nanopowders synthesized at 160 °C. The as-synthesized samples exhibited considerably high absorbance in the visible region of the solar spectrum, with the lowest band gap of 1.76 eV for the sample S-BFO(160). Interestingly, S-BFO(160) exhibited the highest photocatalytic performance under solar irradiation, toward the degradation of rhodamine B and methylene blue dyes owing to homogeneous phase distribution, regular powder-like morphology, lowest band gap, and quenching of electron-hole pair recombination. The photodegradation of a colorless organic pollutant (ciprofloxacin) was also examined to ensure that the degradation is photocatalytic and not dye-sensitized. In summary, Gd and Cr co-doping have proven to be a compelling energy-saving and low-cost approach for the formulation of sillenite-phase bismuth ferrite with promising photocatalytic activity.
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