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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: 11] [Impact Index Per Article: 11.0] [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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Shao X, He J, Su Q, Zhao D, Feng S. Synergy effect of CuO on CuCo 2O 4 for methane catalytic combustion. RSC Adv 2022; 12:17490-17497. [PMID: 35765424 PMCID: PMC9194921 DOI: 10.1039/d2ra02237k] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2022] [Accepted: 05/31/2022] [Indexed: 11/26/2022] Open
Abstract
Spinel oxides (AB2O4) have been widely studied as catalysts for methane combustion. Increasing attention was focused on the catalysis properties of the [B2O3] octahedron; however, the role of the [AO] tetrahedron in the catalytic activity was seldom discussed. Herein, a series of (CuO)x–CuCo2O4 (x = 0, 0.1, 0.2) composite oxides were synthesized by a solvothermal method. The structure, morphology, and physicochemical properties of the as-synthesized samples were characterized by the XRD, SEM, BET, and XPS techniques. The results of the catalytic activity tests showed that the coexistence of CuO with CuCo2O4 can improve the catalytic activity. The XPS results demonstrated that there were remarkable Cu+ ions present in the composite oxides, which can cause increases in the number of oxygen vacancies on the surface of the catalysts. In addition, the redox of Cu+ and Cu2+ may improve the oxygen exchange capacity for methane oxidation. CuO and CuCo2O4 exhibit a synergistic effect in catalyzing methane combustion, which increases the oxidation rate of methane on the surface of (CuO)0.2–CuCo2O4 composite oxide and decreasing the methane combustion temperature.![]()
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Affiliation(s)
- Xiaoqiang Shao
- Key Laboratory of Functional Molecule Design and Interface Process China
| | - Jia He
- Key Laboratory of Functional Molecule Design and Interface Process China
| | - Qin Su
- Key Laboratory of Functional Molecule Design and Interface Process China
| | - Donglin Zhao
- Key Laboratory of Functional Molecule Design and Interface Process China
| | - Shaojie Feng
- Key Laboratory of Functional Molecule Design and Interface Process China.,Anhui Province International Center on Advanced Building Materials, Anhui Jianzhu University Hefei 230601 China
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Catalytic methane combustion in plate-type microreactors with different channel configurations: An experimental study. Chem Eng Sci 2021. [DOI: 10.1016/j.ces.2021.116517] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Analysis of Entropy Production in Structured Chemical Reactors: Optimization for Catalytic Combustion of Air Pollutants. ENTROPY 2020; 22:e22091017. [PMID: 33286786 PMCID: PMC7597110 DOI: 10.3390/e22091017] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/06/2020] [Revised: 09/08/2020] [Accepted: 09/09/2020] [Indexed: 11/17/2022]
Abstract
Optimization of structured reactors is not without some difficulties due to highly random economic issues. In this study, an entropic approach to optimization is proposed. The model of entropy production in a structured catalytic reactor is introduced and discussed. Entropy production due to flow friction, heat and mass transfer and chemical reaction is derived and referred to the process yield. The entropic optimization criterion is applied for the case of catalytic combustion of methane. Several variants of catalytic supports are considered including wire gauzes, classic (long-channel) and short-channel monoliths, packed bed and solid foam. The proposed entropic criterion may indicate technically rational solutions of a reactor process that is as close as possible to the equilibrium, taking into account all the process phenomena such as heat and mass transfer, flow friction and chemical reaction.
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Abstract
Metal foams are considered as promising catalyst carriers due to their high porosity, large specific surface area, and satisfactory thermal and mechanical stability. The study presents heat transfer and pressure drop experiments performed for seven foams of different pore densities made from diverse metals. Mass transfer characteristics are derived using the Chilton–Colburn analogy. It was found that the foams display much more intense heat/mass transfer than a monolith, comparable to packed bed. Next, the foams’ efficiencies have been compared, using 1D reactor modeling, in catalytic reactions displaying either slower (selective catalytic reduction of NOx) or faster kinetics (catalytic methane combustion). For the slow kinetics, the influence of carrier specific surface area at which catalyst can be deposited (i.e., catalyst amount) was decisive to achieve high process conversion and short reactor. For this case, monolith appears as the best choice assuming it’s the lowest pressure drop. For the fast reaction, the mass transfer becomes the limiting parameter, thus solid foams are the best solution.
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High Catalytic Performance of Mn-Doped Ce-Zr Catalysts for Chlorobenzene Elimination. NANOMATERIALS 2019; 9:nano9050675. [PMID: 31052385 PMCID: PMC6567123 DOI: 10.3390/nano9050675] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/11/2019] [Revised: 04/02/2019] [Accepted: 04/16/2019] [Indexed: 11/16/2022]
Abstract
Mn-Ce-Zr-O catalysts doped with varying Mn content were prepared and assessed for the catalytic combustion of chlorobenzene (CB). Nanosized MCZ-0.67 catalyst with amorphous phase exhibited a high and stable catalytic activity among the studied catalysts, achieving 90% CB conversion at 226 °C and withstanding stability tests, including time-based stability and the successive influence of various operating conditions. Meanwhile, the MCZ-0.67 catalyst used showed good recyclability by calcination in air. Characterization results suggested that Mn doping played a dominant role in improving the catalytic performance, resulting in larger surface area, better redox properties and greater amounts of surface active oxygen. In addition, the introduction of Zr was also indispensable for maintaining the good catalytic performance of catalysts. Finally, trace amounts of polychlorinated by-products during CB oxidation were monitored and the oxidation process was discussed.
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Meroni D, Ardizzone S. Preparation and Application of Hybrid Nanomaterials. NANOMATERIALS 2018; 8:nano8110891. [PMID: 30388802 PMCID: PMC6266429 DOI: 10.3390/nano8110891] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 10/23/2018] [Revised: 10/29/2018] [Accepted: 10/30/2018] [Indexed: 12/17/2022]
Abstract
The growing demand of new materials with tailored physicochemical properties has propelled hybrid materials to a position of prominence in materials science by virtue of their remarkable new properties and multifunctional nature. [...].
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Affiliation(s)
- Daniela Meroni
- Dipartimento di Chimica, Università degli Studi di Milano, Via Golgi 19, 20133 Milano, Italy.
- Consorzio Interuniversitario Nazionale per la Scienza e la Tecnologia dei Materiali (INSTM), Via Giusti 9, 50121 Firenze, Italy.
| | - Silvia Ardizzone
- Dipartimento di Chimica, Università degli Studi di Milano, Via Golgi 19, 20133 Milano, Italy.
- Consorzio Interuniversitario Nazionale per la Scienza e la Tecnologia dei Materiali (INSTM), Via Giusti 9, 50121 Firenze, Italy.
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Gancarczyk A, Iwaniszyn M, Piątek M, Korpyś M, Sindera K, Jodłowski PJ, Łojewska J, Kołodziej A. Catalytic Combustion of Low-Concentration Methane on Structured Catalyst Supports. Ind Eng Chem Res 2018. [DOI: 10.1021/acs.iecr.8b01987] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Anna Gancarczyk
- Institute of Chemical Engineering, Polish Academy of Sciences, Bałtycka 5, 44-100 Gliwice, Poland
| | - Marzena Iwaniszyn
- Institute of Chemical Engineering, Polish Academy of Sciences, Bałtycka 5, 44-100 Gliwice, Poland
| | - Marcin Piątek
- Institute of Chemical Engineering, Polish Academy of Sciences, Bałtycka 5, 44-100 Gliwice, Poland
| | - Mateusz Korpyś
- Institute of Chemical Engineering, Polish Academy of Sciences, Bałtycka 5, 44-100 Gliwice, Poland
| | - Katarzyna Sindera
- Institute of Chemical Engineering, Polish Academy of Sciences, Bałtycka 5, 44-100 Gliwice, Poland
| | - Przemysław J. Jodłowski
- Faculty of Chemical Engineering and Technology, Cracow University of Technology, Warszawska 24, 31-155 Kraków, Poland
| | - Joanna Łojewska
- Faculty of Chemistry, Jagiellonian University, Gronostajowa 2, 30-387 Kraków, Poland
| | - Andrzej Kołodziej
- Institute of Chemical Engineering, Polish Academy of Sciences, Bałtycka 5, 44-100 Gliwice, Poland
- Faculty of Civil Engineering and Architecture, Opole University of Technology, Katowicka 48, 45-061 Opole, Poland
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