Textural and photocatalytic characteristics of iron-cobalt based nanocomposites supported on SBA-15: Synergistic effect between Fe2+ and Fe0 on photoactivity

Silva, Monickarla Teixeira Pegado da; Villarroel-Rocha, Jhonny; Toncón-Leal, C.F.; Barbosa, Felipe Fernandes; Miranda, Maicon Oliveira; Morales, Marco A.; Sapag, Karim; Pergher, Sibele Berenice Castellã; Braga, Tiago Pinheiro

doi:10.1016/j.micromeso.2020.110582

Cited by 18 publications

(10 citation statements)

References 53 publications

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“…It was highly noted that a higher pore volume significantly improves photocatalytic activity by providing abundant catalytically active sites. 141 In addition, it was pronounced that substituting divalent metal in MgCr with Zn 2+ reduces the band gap energy towards 1.82 eV as proclaimed by Baliarsingh et al 142 Besides, they also disclosed that ZnCr LDH exhibits a higher pore diameter of 12.14 nm compared to other divalent metal substitutions (Mg, Ni, Cu, Co). However, despite their positive attribution in enhancing the properties of LDH, Luo et al ascribed that pure Zn-based LDH was revealed to produce lower down to no hydrogen production.…”

Section: Zn-based Ldhmentioning

confidence: 93%

“…Incorporating Zn 2+ in the LDH matrix displayed a higher pore volume and diameter than other divalent metal substitutions, which is significant in providing the accessibility of the active sites. 141,237 Co is a highly conductive material that is categorized in the 3d transition metal along with Ni, Zn, and Fe, and is typically introduced into the LDH matrix in either divalent or trivalent valence form. They were noticed to be highly active and very efficient in driving the catalytic reaction due to the presence of unsaturated CoO6-x octahedron, which is highly exposed on the surface of the LDH, thus providing abundant active sites for carrying out the redox reaction.…”

Section: Literature Analysis For Efficient Design Of Ldhmentioning

confidence: 99%

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Recent developments in layered double hydroxide structures with their role in promoting photocatalytic hydrogen production: A comprehensive review

Sherryna

Tahir

2021

Intl J of Energy Research

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Layered double hydroxides (LDHs) have received scientific attractions due to their unique two-dimensional (2D) structure, band gap tunability, and compositional flexibility, leading to the facile incorporation of the metal species into their layered structure. The main objective of this review is to explore the current advancement of LDH-based photocatalysts for photocatalytic hydrogen production by focusing on the role of divalent and trivalent metal incorporations and their efficiency enhancement. Firstly, the mechanism of photocatalysis and its thermodynamics has been explicated to gain basic understanding and fundamentals. Secondly, a brief introduction to the overview of LDH photocatalysts with special attention to the effects of cationic incorporations on the optical properties and computational study towards the electronic density has been demonstrated. Besides, the thermal stability of LDH is briefly discussed, focusing on the effects of temperature towards the conversion into mixed-metal oxide (MMO). Next, the classification of LDH based on divalent and trivalent cationic elements and their role in the brucite layer of LDH are systematically discussed. Attention is given to the mechanistic properties of the extensively studied metals, such as Mg, Ni, Zn, Co, Cr, Fe, V and Al, with the efficiency enhancements through various engineering aspects are demonstrated. The overview summary on the efficient design of LDH is elucidated to provide a deep understanding for improving their photocatalytic properties. Lastly, the future perspectives and recommendations are discussed to provide new insight into the potential of LDH and render them a notable place in solar energy applications.

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Section: Zn-based Ldhmentioning

confidence: 93%

Section: Literature Analysis For Efficient Design Of Ldhmentioning

confidence: 99%

Recent developments in layered double hydroxide structures with their role in promoting photocatalytic hydrogen production: A comprehensive review

Sherryna

Tahir

2021

Intl J of Energy Research

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“…Among them, AOPs stand out for using oxidizing agents, such as hydroxyl radicals (HO•), peroxyl radicals (•O 2 -), and hydroperoxide radicals (HOO•), to degrade and mineralize organic materials into carbon dioxide and water [ 9 ]. These processes can be divided into two groups: firstly, degradation occurs in the presence of irradiation (photocatalytic processes); secondly, oxidation occurs by electrochemical processes [ 10 ].…”

Section: Introductionmentioning

confidence: 99%

Synthesis, Characterization and Photocatalytic Activity of CoFe2O4/Fe2O3 Dispersed in Mesoporous KIT-6

et al. 2022

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The present work aimed to synthesize and characterize a solid based on CoFe2O4/Fe2O3-KIT-6 and evaluate its performance in the photocatalytic degradation of the remazol red ultra RGB dye. By analyzing XRD, N2 physisorption, and Mössbauer results, it was possible to identify that the desired CoFe2O4/Fe2O3 phase was achieved, which maintained its structural properties. The FTIR-pyridine indicated the presence of Lewis acid sites, while TPD-CO2 showed a large amount of weak basic sites. The band-gap energy indicated that the compound can be applied in photocatalytic degradation under UV/visible light, with the possibility of magnetic separation at the end of the reaction. The photocatalysis results indicated that there was complete degradation of the remazol red ultra RGB dye within 1 h of reaction. Despite the absence of H2O2, the combination of the proposed photocatalyst with the anatase phase (TiO2) showed significant improvements in the degradation process. The proposed mechanism for complete dye degradation indicated that a sequence of radical reactions is necessary, generating oxidant species such as •OH and the final products were CO2 and H2O.

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“…[ 17 ], activated carbons [ 18 ], and biopolymers (e.g., chitosan and cellulose) [ 19 ]—can prevent GO aggregation and increase recovery after wastewater treatment. Among these support materials, SBA-15 is a widely used mesostructural material that provides a stable support structure and has hexagonally packed uniform porosity, adjustable pore size, and high surface area [ 20 ]. SBA-15 can facilitate excellent GO dispersion to increase adsorption capacity and ensure fast kinetics and recyclability.…”

Section: Introductionmentioning

confidence: 99%

Utilization of Rice Husk Ash in the Preparation of Graphene-Oxide-Based Mesoporous Nanocomposites with Excellent Adsorption Performance

Liou

2021

Materials

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Rice husk is an agricultural biomass waste. Burning rice husks in an oxygenic atmosphere releases thermal energy and produces ash that is rich in silica. Rice husk ash (RHA) can be used as a sustainable source of silica for producing high-value-added products. In this study, mesostructural graphene oxide (GO)/SBA-15, a graphene-based hybrid material, was synthesized from RHA. The materials are inspected by Fourier transform infrared spectrometer, Raman spectrometer, field-emission scanning electron microscopy, transmission electron microscopy, surface area analyzer, and X-ray diffraction analyzer. Studies have revealed that GO/SBA-15 possesses various oxygen functional groups that are helpful for dye adsorption. The material consisted of high pore volume of 0.901 cm3/g, wide pores of diameter 11.67 nm, and high surface area of 499 m2/g. Analysis of the methylene blue (MB) adsorption behavior of GO/SBA-15 composites revealed that their adsorption capacity depended on the gelation pH, GO content, adsorbent dosage, and initial dye (MB) concentration. The highest adsorption capacity of GO/SBA-15 was 632.9 mg/g. Furthermore, the adsorption isotherms and kinetics of GO/SBA-15 were investigated. This study demonstrated the great advantage of treated RHA and the potential of this material for use in organic dye adsorption.

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Textural and photocatalytic characteristics of iron-cobalt based nanocomposites supported on SBA-15: Synergistic effect between Fe2+ and Fe0 on photoactivity

Cited by 18 publications

References 53 publications

Recent developments in layered double hydroxide structures with their role in promoting photocatalytic hydrogen production: A comprehensive review

Recent developments in layered double hydroxide structures with their role in promoting photocatalytic hydrogen production: A comprehensive review

Synthesis, Characterization and Photocatalytic Activity of CoFe2O4/Fe2O3 Dispersed in Mesoporous KIT-6

Utilization of Rice Husk Ash in the Preparation of Graphene-Oxide-Based Mesoporous Nanocomposites with Excellent Adsorption Performance

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