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Eddy NO, Edet UE, Oladele JO, Kelle HI, Ogoko EC, Odiongenyi AO, Ameh P, Ukpe RA, Ogbodo R, Garg R, Garg R. Synthesis and application of novel microporous framework of nanocomposite from trona for photocatalysed degradation of methyl orange dye. ENVIRONMENTAL MONITORING AND ASSESSMENT 2023; 195:1416. [PMID: 37925387 DOI: 10.1007/s10661-023-12014-x] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/29/2023] [Accepted: 10/23/2023] [Indexed: 11/06/2023]
Abstract
Photocatalysed degradation of environmental contaminants is one of the most fashionable technologies in the purification of water because the method converts toxic products to nontoxic ones. In this study, a method has been developed to synthesize novel nanocomposites of Na-Ca-Al-Si oxides for the first time. The average surface area, pore volume and pore size for the novel product were 1742.55 m2/g, 0.3499 cc/g and 3.197 nm respectively. The crystal parameters were a = 7.1580 Å, b = 7.4520 Å, c = 7.7160 Å, α = 115.0600, β = 107.3220, γ = 100.4380, density (calculated) = 2.0 × 103g/cm3 and cell volume = 332.7 Å3 respectively. The average crystalline size deduced from the Scherrer equation (i.e. 6.9393 nm) was higher than the value of 1.024 nm obtained from the graphical method. The FTIR and UV spectra of the nanocomposites were unique and provided baseline information that characterises the new product. XRD profiling of the new product reveals the existent of a silica framework consisting of NaAlSi3O3 and CaAl2Si2O8 The synthesized nanocomposites is an effective photocatalyst for the degradation of methyl orange dye in water, with aoptimum efficiency of 96% at an initial dye concentration of 10 ppm, the adsorbent dosage of 0.5 g,contact time of 90 min and pH of 2.5. The Langmuir-Hinshelwood, modified Freundlich and pseudo-second kinetic models were significant in the description of the photocatalytic kinetics of the degraded dye molecules.
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Affiliation(s)
- Nnabuk Okon Eddy
- Department of Pure and Industrial Chemistry, University of Nigeria, Nsukka, Enugu State, Nigeria.
- Department of Chemistry, National Open University of Nigeria, Jabi, Federal Capital Territory, Abuja, Nigeria.
| | - Unwana Edo Edet
- Department of Chemistry, National Open University of Nigeria, Jabi, Federal Capital Territory, Abuja, Nigeria
| | - Joseph Olusola Oladele
- Department of Pure and Industrial Chemistry, University of Nigeria, Nsukka, Enugu State, Nigeria
| | | | - Emeka Chima Ogoko
- Department of Chemistry, National Open University of Nigeria, Jabi, FCT, Abuja, Nigeria
| | - Anduang O Odiongenyi
- Department of Chemistry, Akwa Ibom State University, Ikot Akpaden, MkpatEnin Local Government Area, Nigeria
| | - Paul Ameh
- Department of Chemistry, Nigeria Police Academy, Wudi, Kano State, Nigeria
| | | | - Raphael Ogbodo
- Department of Chemistry, University of Iowa, Iowa City, Iowa, 52244, USA
| | - Rajni Garg
- Department of Applied Science and Humanities, Galgotias College of Engineering & Technology, Greater Noida, 201310, India
| | - Rishav Garg
- Department of Civil Engineering, Galgotias College of Engineering & Technology, Greater Noida, 201310, India
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Al-Saeedi SI. Photoelectrochemical Green Hydrogen Production Utilizing ZnO Nanostructured Photoelectrodes. MICROMACHINES 2023; 14:mi14051047. [PMID: 37241670 DOI: 10.3390/mi14051047] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/30/2023] [Revised: 05/11/2023] [Accepted: 05/11/2023] [Indexed: 05/28/2023]
Abstract
One of the emerging and environmentally friendly technologies is the photoelectrochemical generation of green hydrogen; however, the cheap cost of production and the need for customizing photoelectrode properties are thought to be the main obstacles to the widespread adoption of this technology. The primary players in hydrogen production by photoelectrochemical (PEC) water splitting, which is becoming more common on a worldwide basis, are solar renewable energy and widely available metal oxide based PEC electrodes. This study attempts to prepare nanoparticulate and nanorod-arrayed films to better understand how nanomorphology can impact structural, optical, and PEC hydrogen production efficiency, as well as electrode stability. Chemical bath deposition (CBD) and spray pyrolysis are used to create ZnO nanostructured photoelectrodes. Various characterization methods are used to investigate morphologies, structures, elemental analysis, and optical characteristics. The crystallite size of the wurtzite hexagonal nanorod arrayed film was 100.8 nm for the (002) orientation, while the crystallite size of nanoparticulate ZnO was 42.1 nm for the favored (101) orientation. The lowest dislocation values for (101) nanoparticulate orientation and (002) nanorod orientation are 5.6 × 10-4 and 1.0 × 10-4 dislocation/nm2, respectively. By changing the surface morphology from nanoparticulate to hexagonal nanorod arrangement, the band gap is decreased to 2.99 eV. Under white and monochromatic light irradiation, the PEC generation of H2 is investigated using the proposed photoelectrodes. The solar-to-hydrogen conversion rate of ZnO nanorod-arrayed electrodes was 3.72% and 3.12%, respectively, under 390 and 405 nm monochromatic light, which is higher than previously reported values for other ZnO nanostructures. The output H2 generation rates for white light and 390 nm monochromatic illuminations were 28.43 and 26.11 mmol.h-1cm-2, respectively. The nanorod-arrayed photoelectrode retains 96.6% of its original photocurrent after 10 reusability cycles, compared to 87.4% for the nanoparticulate ZnO photoelectrode. The computation of conversion efficiencies, H2 output rates, Tafel slope, and corrosion current, as well as the application of low-cost design methods for the photoelectrodes, show how the nanorod-arrayed morphology offers low-cost, high-quality PEC performance and durability.
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Affiliation(s)
- Sameerah I Al-Saeedi
- Department of Chemistry, College of Science, Princess Nourah Bint Abdulrahman University, P.O. Box 84428, Riyadh 11671, Saudi Arabia
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Parrey SH, Ud Din Parray M, Manoharadas S, Altaf M, Alrefaei AF, Badjah Hadj AYM, Patel R, Ahmad R, Khan AB. Biomimetic Synthesis of Au‐Nps using Cassia fistula Flower Extract and Studies of their Protein Interaction. ChemistrySelect 2022. [DOI: 10.1002/slct.202203042] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
| | - Mehraj Ud Din Parray
- Centre for Interdisciplinary Research in Basic Sciences, Jamia Millia Islamia New Delhi India
| | - Salim Manoharadas
- King Saud University Department of Botany and Microbiology College of Science Building 5, P.O. Box. 2454 Riyadh 11451 Saudi Arabia
- King Saud University Central Laboratory RM 55A College of Science Building 5, P.O. Box. 2454 Riyadh 11451 Saudi Arabia
| | - Mohammad Altaf
- King Saud University Central Laboratory RM 55A College of Science Building 5, P.O. Box. 2454 Riyadh 11451 Saudi Arabia
- King Saud University Department of chemistry College of Science Building 5, P.O. Box. 2454 Riyadh 11451 Saudi Arabia
| | - Abdulwahed Fahad Alrefaei
- King Saud University Department of Zoology College of Science, P.O. Box. 2454 Riyadh 11451 Saudi Arabia
| | - Ahmed Yacine M. Badjah Hadj
- King Saud University Department of chemistry College of Science Building 5, P.O. Box. 2454 Riyadh 11451 Saudi Arabia
| | - Rajan Patel
- Centre for Interdisciplinary Research in Basic Sciences, Jamia Millia Islamia New Delhi India
| | - Rabia Ahmad
- Department of Chemistry Jamia Millia Islamia New Delhi India
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Silica Aerogel-Rubber Composite: A Sustainable Alternative for Buildings' Thermal Insulation. Molecules 2022; 27:molecules27207127. [PMID: 36296724 PMCID: PMC9606976 DOI: 10.3390/molecules27207127] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2022] [Revised: 10/11/2022] [Accepted: 10/17/2022] [Indexed: 11/18/2022] Open
Abstract
Silica aerogel composites with recycled tire rubber have been synthesized and evaluated for their potential use for thermal protection in buildings. The present work describes for the first time the preparation of silica-based aerogel composites containing recycled rubber tires reinforced with polyvinyl butyral (PVB) by hot pressing. The developed composite was extensively characterized regarding its physical, morphological, thermal and mechanical features, and the results showed their properties were relevant, leading to composites with different properties/performances. The obtained bulk density values were satisfactory, down to 474 kg·m-3, and very good thermal properties were achieved, namely, thermal conductivity as low as 55 mW·m-1·K-1 for composites with silica aerogel, recycled tire rubber and PVB. The most promising composites were those based on low bulk density and thermal conductivity values, and they were thermally stable, indicating their suitability for thermal insulation applications.
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Green synthesis of silver nanoparticles using Acacia leucophloea in the presence of cetyltrimethylammonium bromide and their antibacterial activity. Colloid Polym Sci 2022. [DOI: 10.1007/s00396-022-04995-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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Medouni I, Portavoce A, Maugis P, Eyméoud P, Yescas M, Hoummada K. Role of dislocation elastic field on impurity segregation in Fe-based alloys. Sci Rep 2021; 11:1780. [PMID: 33469073 PMCID: PMC7815746 DOI: 10.1038/s41598-020-80140-4] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2020] [Accepted: 12/07/2020] [Indexed: 11/10/2022] Open
Abstract
Dislocation engineering in crystalline materials is essential when designing materials for a large range of applications. Segregation of additional elements at dislocations is frequently used to modify the influence of dislocations on material properties. Thus, the influence of the dislocation elastic field on impurity segregation is of major interest, as its understanding should lead to engineering solutions that improve the material properties. We report the experimental study of the elastic field influence on atomic segregation in the core and in the area surrounding edge dislocations in Fe-based alloys. Each element is found either to segregate in the edge dislocation core or to form atmospheres. The elastic field has a strong effect on the segregation atmosphere, but no effect on the dislocation core segregation. The theory is in good agreement with experiments, and should support dislocation engineering.
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Affiliation(s)
- I Medouni
- IM2NP, Faculté des Sciences de Saint-Jérôme case 142, Aix-Marseille University/CNRS, 13397, Marseille, France
- FRAMATOME, Développement (DTID) Et Ingénierie Mécanique (DTIM), 92084, Paris La Défense Cedex, France
| | - A Portavoce
- IM2NP, Faculté des Sciences de Saint-Jérôme case 142, Aix-Marseille University/CNRS, 13397, Marseille, France.
| | - P Maugis
- IM2NP, Faculté des Sciences de Saint-Jérôme case 142, Aix-Marseille University/CNRS, 13397, Marseille, France
| | - P Eyméoud
- IM2NP, Faculté des Sciences de Saint-Jérôme case 142, Aix-Marseille University/CNRS, 13397, Marseille, France
| | - M Yescas
- FRAMATOME, Développement (DTID) Et Ingénierie Mécanique (DTIM), 92084, Paris La Défense Cedex, France
| | - K Hoummada
- IM2NP, Faculté des Sciences de Saint-Jérôme case 142, Aix-Marseille University/CNRS, 13397, Marseille, France
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Reflection of strengthening results in values of generalized degrees of metallicity and covalence is principle to new strategy of designing alloys. Sci Rep 2020; 10:2050. [PMID: 32029821 PMCID: PMC7005301 DOI: 10.1038/s41598-020-58560-z] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2019] [Accepted: 01/14/2020] [Indexed: 12/03/2022] Open
Abstract
To the best of our knowledge, the general approach of designing alloys with specified mechanical properties does not exist. This is due to the unresolved problem of analysing the set of heterogeneous variables that affect the mechanical properties along its production line from the smelting of the alloy to the manufacture of the final product. Here, we show that in principle this problem can be solved by analysing all the strengthening mechanisms in a common reference frame with reference to the single factor namely, the generalized degree of metallicity and covalence, which characterizes the entire interatomic bonds in all phases of the alloy. Such factors are able to reflect the results of hardening by various mechanisms because of the correlation with the mechanical properties. From the energy view point, these factors correspond to the proportion of the metallic and covalent bonds energy in the total energy of all chemical bonds in the alloy. Based on the approach being developed, we considered a method for predicting new doping systems for dispersively strengthening aluminum alloys according to the criterion of a given strength and have considered the methodology of optimizing chemical composition in steel smelting which is used for mass production of parts according to the criterion of the desired mechanical properties obtained due to solid solution hardening.
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Microstructure, Texture, Electrical and Mechanical Properties of AA-6063 Processed by Multi Directional Forging. MATERIALS 2018; 11:ma11122419. [PMID: 30501094 PMCID: PMC6317036 DOI: 10.3390/ma11122419] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/30/2018] [Revised: 11/20/2018] [Accepted: 11/27/2018] [Indexed: 11/22/2022]
Abstract
In current research, the effect of the multi-directional forging (MDF) process on the microstructure, texture, mechanical and electrical properties of AA-6063 under different heat treatment conditions at various MDF temperatures was studied. The annealed AA-6063 alloy was processed up to three passes of MDF at ambient temperature. Three passes of this process were also applied to the solution-treated AA-6063 at ambient temperature and 177 °C. Microstructural investigations demonstrated that the MDF process led to a significant reduction in the average grain size as well as a considerable increase in the fraction of low angle grain boundaries. Texture analysis revealed that copper and Goss textures were mainly developed within the annealed and solution-treated samples of AA-6063, respectively. The hardness and shear strength values of all processed samples also showed a sizeable improvement compared to the initial heat-treated samples. For example, the hardness and shear yield strength value of the solution-treated sample MDFed for three passes showed more than 100 and 70% increase, respectively. The effect of the MDF process on the electrical conductivity of AA-6063 under different heat treatment conditions at various temperatures was negligible. So, it can be concluded that the MDF process increased the mechanical properties without an appreciable decrease in electrical conductivity.
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