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Wary RR, Narzary M, Brahma BB, Brahma D, Kalita P, Buzar Baruah M. Nanostructural Design of ZnO Using an Agro-Waste Extract for a Sustainable Process and Its Photocatalytic Activity. ACS APPLIED BIO MATERIALS 2023; 6:4645-4661. [PMID: 37938913 DOI: 10.1021/acsabm.3c00412] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2023]
Abstract
The use of agro-waste extracts (AWEs) as a sustainable medium for developing cost-effective and ecologically friendly nanomaterials has piqued the interest of current researchers. Herein, waste extracts from papaya barks, banana peels, thumba plants, and snail shells were used for synthesizing ZnO nanostructures via a hydrothermal method, followed by calcination at 400 °C. The crystallinity and pure wurtzite phase formation of ZnO nanostructures were confirmed via X-ray diffraction. ZnO nanostructures with various morphologies such as tight sheet-like, spherical, porous sheet-like, and bracket-shaped, comprising small interconnected particles with a highly catalytically active exposed (0001) facet, were observed via field emission scanning electron microscopy and transmission electron microscopy. The formation mechanism of the various morphologies of the ZnO nanostructures was proposed. Ultraviolet-visible spectra showed different absorption band edges of ZnO nanostructures with a bandgap in the range of 3.17-3.27 eV. Photoluminescence studies showed the presence of various defect states such as oxygen and zinc vacancies and oxygen and zinc interstitials on ZnO nanostructures, which are usually observed in traditionally prepared ZnO. The photocatalytic activity of ZnO nanostructures was evaluated under direct sunlight using rhodamine B (RhB) and Congo red (CR) dyes as probe pollutants. Furthermore, prepared ZnO nanostructures could potentially adsorb anionic dyes (e.g., CR) in the absence of light. Superoxide and hydroxide radicals played a vital role in the photocatalytic activity of ZnO. The photocatalyst could be reused for up to three cycles, indicating its stability. Therefore, this study reports the diverse use of AWEs as cost-effective media for nanomaterial synthesis.
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Affiliation(s)
- Riu Riu Wary
- Department of Physics, Central Institute of Technology Kokrajhar (Deemed to be University, MoE, Govt. of India), Kokrajhar 783370, Assam, India
| | - Mousumi Narzary
- Department of Physics, Central Institute of Technology Kokrajhar (Deemed to be University, MoE, Govt. of India), Kokrajhar 783370, Assam, India
| | - Bidhu Bhusan Brahma
- Department of Physics, Central Institute of Technology Kokrajhar (Deemed to be University, MoE, Govt. of India), Kokrajhar 783370, Assam, India
| | - Dulu Brahma
- Department of Chemistry, Central Institute of Technology Kokrajhar (Deemed to be University, MoE, Govt. of India), Kokrajhar 783370, Assam, India
| | - Pranjal Kalita
- Department of Chemistry, Central Institute of Technology Kokrajhar (Deemed to be University, MoE, Govt. of India), Kokrajhar 783370, Assam, India
| | - Manasi Buzar Baruah
- Department of Physics, Central Institute of Technology Kokrajhar (Deemed to be University, MoE, Govt. of India), Kokrajhar 783370, Assam, India
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Halfadji A, Chougui A, Djeradi R, Ouabad FZ, Aoudia H, Rajendrachari S. TiO 2-Decorated by Nano-γ-Fe 2O 3 as a Catalyst for Efficient Photocatalytic Degradation of Orange G Dye under Eco-friendly White LED Irradiation. ACS OMEGA 2023; 8:39907-39916. [PMID: 37901492 PMCID: PMC10601431 DOI: 10.1021/acsomega.3c06420] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/28/2023] [Accepted: 09/28/2023] [Indexed: 10/31/2023]
Abstract
Azo dyes make up a major class of dyes that have been widely studied for their diverse applications. In this study, we successfully applied nano-γ-Fe2O3/TiO2 as a nanocatalyst to improve the photodegradation efficiency of azo dyes (Orange G (OG) dye as a model) from aqueous solution under white light-emitting diode (LED) irradiation. We also investigated the degradation mechanisms and pathways of OG dye as well as the effects of the initial pH value, amount of H2O2, catalyst dosage, and dye concentration on the degradation processes. The characterizations of nano-γ-Fe2O3 and γ-Fe2O3 Nps/TiO2 were carried out using various techniques, including X-ray diffractometry, scanning electron microscopy, energy-dispersive X-ray spectroscopy, Fourier transform infrared spectroscopy, and UV-visible spectroscopy. The efficiency of the photodegradation reaction of OG was found to follow pseudo-first-order kinetics (Langmuir-Hinshelwood model) with a rate constant of 0.0338 min-1 and an R2 of 0.9906. Scavenger experiments revealed that hydroxyl radicals and superoxide anion radicals were the dominant species in the OG photocatalytic oxidation mechanism. This work provides a new method for designing highly efficient heterostructure-based photocatalysts (γ-Fe2O3 Nps/TiO2) based on LED light irradiation for environmental applications.
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Affiliation(s)
- Ahmed Halfadji
- Synthesis
and Catalysis Laboratory, Ibn Khaldoun University
of Tiaret, Tiaret 14000, Algeria
- Department
of Sciences and Technology, Faculty of Applied Sciences, Ibn Khaldoun University of Tiaret, Tiaret 14000, Algeria
| | - Abdelkader Chougui
- Department
of Sciences and Technology, Faculty of Applied Sciences, Ibn Khaldoun University of Tiaret, Tiaret 14000, Algeria
| | - Rania Djeradi
- Department
of Chemistry, Ibn Khaldoun University of
Tiaret, Tiaret 14000, Algeria
| | - Fatima Zohra Ouabad
- Department
of Chemistry, Ibn Khaldoun University of
Tiaret, Tiaret 14000, Algeria
| | - Hanane Aoudia
- Department
of Sciences and Technology, Faculty of Applied Sciences, Ibn Khaldoun University of Tiaret, Tiaret 14000, Algeria
| | - Shashanka Rajendrachari
- Department
of Metallurgical and Materials Engineering, Bartin University, Bartin 74100, Turkey
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Patra R, Dash P, Panda PK, Yang PC. A Breakthrough in Photocatalytic Wastewater Treatment: The Incredible Potential of g-C 3N 4/Titanate Perovskite-Based Nanocomposites. NANOMATERIALS (BASEL, SWITZERLAND) 2023; 13:2173. [PMID: 37570490 PMCID: PMC10421126 DOI: 10.3390/nano13152173] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/03/2023] [Revised: 07/14/2023] [Accepted: 07/15/2023] [Indexed: 08/13/2023]
Abstract
Water pollution has emerged as a major global environmental crisis due to the massive contamination of water resources by the textile dyeing industry, organic waste, and agricultural residue. Since water is fundamental to life, this grave disregard puts lives at risk, making the protection of water resources a serious issue today. Recent research has shown great interest in improving the photocatalytic performance of graphitic carbon nitride (g-C3N4) for wastewater treatment. However, the photocatalytic removal activity of pure g-C3N4 is poor, owing to its minimal surface area, fast recombination of photo-generated electron-hole pairs, and poor light absorption. Recently, titanate perovskites (TNPs) have attracted significant attention in both environmental remediation and energy conversion due to their exceptional structural, optical, physiochemical, electrical, and thermal properties. Accordingly, TNPs can initiate a variety of surface catalytic reactions and are regarded as an emerging category of photocatalysts for sustainability and energy-related industries when exposed to illumination. Therefore, in this review article, we critically discuss the recent developments of extensively developed g-C3N4/TNPs that demonstrate photocatalytic applications for wastewater treatment. The different synthetic approaches and the chemical composition of g-C3N4/TNP composites are presented. Additionally, this review highlights the global research trends related to these materials. Furthermore, this review provides insight into the various photocatalytic mechanisms, including their potential impact and significance. Also, the challenges faced by such materials and their future scope are discussed.
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Affiliation(s)
- Rashmiranjan Patra
- Department of Chemical Engineering and Materials Science, Yuan Ze University, Taoyuan 32003, Taiwan;
| | - Pranjyan Dash
- Department of Chemical Engineering and Biotechnology, National Taipei University of Technology (Taipei Tech), Taipei 10608, Taiwan;
| | - Pradeep Kumar Panda
- Department of Chemical Engineering and Materials Science, Yuan Ze University, Taoyuan 32003, Taiwan;
| | - Po-Chih Yang
- Department of Chemical Engineering and Materials Science, Yuan Ze University, Taoyuan 32003, Taiwan;
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Influence of synthesis procedures on the preparation of strontium titanate nanoparticles and photocatalytic application for methylene blue degradation. REACTION KINETICS MECHANISMS AND CATALYSIS 2023. [DOI: 10.1007/s11144-023-02375-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/02/2023]
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Goren A, Recepoğlu YK, Edebali̇ Ö, Sahin C, Genisoglu M, Okten HE. Electrochemical Degradation of Methylene Blue by a Flexible Graphite Electrode: Techno-Economic Evaluation. ACS OMEGA 2022; 7:32640-32652. [PMID: 36119975 PMCID: PMC9476165 DOI: 10.1021/acsomega.2c04304] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/08/2022] [Accepted: 08/25/2022] [Indexed: 06/15/2023]
Abstract
In this study, electrochemical removal of methylene blue (MB) from water using commercially available and low-cost flexible graphite was investigated. The operating conditions such as initial dye concentration, initial solution pH, electrolyte dose, electrical potential, and operating time were investigated. The Box-Behnken experimental design (BBD) was used to optimize the system's performance with the minimum number of tests possible, as well as to examine the independent variables' impact on the removal efficiency, energy consumption, operating cost, and effluent MB concentration. The electrical potential and electrolyte dosage both improved the MB removal efficiency, since increased electrical potential facilitated production of oxidizing agents and increase in electrolyte dosage translated into an increase in electrical current transfer. As expected, MB removal efficiency increased with longer operational periods. The combined effects of operating time-electrical potential and electrical potential-electrolyte concentration improved the MB removal efficiency. The maximum removal efficiency (99.9%) and lowest operating cost (0.012 $/m3) were obtained for initial pH 4, initial MB concentration 26.5 mg/L, electrolyte concentration 0.6 g/L, electrical potential 3 V, and operating time 30 min. The reaction kinetics was maximum for pH 5, and as the pH increased the reaction rates decreased. Consequent techno-economic assessment showed that electrochemical removal of MB using low-cost and versatile flexible graphite had a competitive advantage.
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Affiliation(s)
- Aysegul
Yagmur Goren
- Department
of Environmental Engineering, Izmir Institute
of Technology, İzmir 35430, Turkey
| | - Yaşar Kemal Recepoğlu
- Department
of Chemical Engineering, Izmir Institute
of Technology, İ zmir 35430, Turkey
| | - Özge Edebali̇
- Department
of Environmental Engineering, Izmir Institute
of Technology, İzmir 35430, Turkey
| | - Cagri Sahin
- Department
of Environmental Engineering, Izmir Institute
of Technology, İzmir 35430, Turkey
| | - Mesut Genisoglu
- Department
of Environmental Engineering, Izmir Institute
of Technology, İzmir 35430, Turkey
| | - Hatice Eser Okten
- Department
of Environmental Engineering, Izmir Institute
of Technology, İzmir 35430, Turkey
- Environmental
Development Application and Research Centre, İzmir Institute of Technology, İzmir 35430, Turkey
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