Exploring the Outcomes of Sulphur Sources on ZnO/CdS Nanocomposites Towards Photocatalytic Degradation of Mordant Black 11 Dye

Selvi, S. Sharon Tamil; Priya, G. Hannah; Ragu, R.; Ancelia, D.; Joseph, L. Allwin; Linet, J. Mary

doi:10.1007/s10876-020-01963-9

Cited by 7 publications

(3 citation statements)

References 32 publications

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“…In Figure 1d, XRD patterns with JCPDS of Co 9 S 8 and CdS for LDH and Co 9 S 8 ‐CdS/LDH reflect the successful derivation of dual‐type QDs after the designed hydrothermal vulcanization. [ 28,30–32 ] Specifically, (003) and (015) crystal planes of LDH in Co 9 S 8 ‐CdS/LDH, Co 9 S 8 /LDH, CdS/LDH and LDH have been compared and analyzed in Figure 1e,f. The position of crystal planes is shifted obviously to the left, indicating that the confined space QDs effectively widened LDH interlayer spacing.…”

Section: Resultsmentioning

confidence: 99%

Confined Space Dual‐Type Quantum Dots for High‐Rate Electrochemical Energy Storage

Yang,

Chung,

Liu

et al. 2024

Advanced Materials

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Owing to quantum size effect and high redox activity, quantum dots (QDs) play very essential roles toward electrochemical energy storage. However, it is very difficult to obtain different‐type and uniformly dispersed high‐active QDs in a stable conductive microenvironment, because QDs prepared by traditional methods are mostly dissolved in solution or loaded on the surface of other semiconductors. Herein, dual‐type semiconductor QDs (Co9S8 and CdS) are skillfully constructed within the interlayer of ultrathin layered double hydroxides (LDH). In particular, the expandable interlayer provides a very suitable confined space for the growth and uniform dispersion of QDs, where Co9S8 originates from in‐situ transformation of cobalt atoms in laminate and CdS is generated from interlayer pre‐embedding Cd2+. Meanwhile, XAFS and GGA+U calculations are employed to explore and prove the mechanism of QDs formation and energy storage characteristics as compared to surface loading QDs. Significantly, the hybrid supercapacitors achieve high energy density of 329.2 μWh cm−2, capacitance retention of 99.1% and coulomb efficiency of 96.9% after 22,000 cycles, which is superior to the reported QDs‐based supercapacitors. These findings provide unique insights for designing and developing stable, ordered, and highly active QDs.This article is protected by copyright. All rights reserved

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Section: Resultsmentioning

confidence: 99%

Confined Space Dual‐Type Quantum Dots for High‐Rate Electrochemical Energy Storage

Yang,

Chung,

Liu

et al. 2024

Advanced Materials

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“…In their review paper, Cheung and Williams included a section on the treatment of metal-complex dyes based on the overarching theme of extraction of transition metals from their chelated complexes for recycling and reuse; a total of 18 methods were identified. From 2020 to February 2022, a small number of research articles have been published on various techniques for the decolourisation of wastewaters containing non-complexed EBT (Tahir & Yasmin, 2021;Tahir et al, 2022;Brito et al, 2019;Blaisi et al, 2018;Zubair et al, 2022;Moeinpour et al, 2014;Selvi et al, 2020;Selvi et al, 2022;Yusaf et al, 2020). The corpus of knowledge must, however, include the determination of ozonation kinetics of some 1:2 metal complex dyes (Oguz et al, 2008); adsorption of chromium-azo dyes on activated carbon synthesized from tannery wastes (Kebede & Gashaw, 2017); simultaneous adsorption and biodegradation by Aspergillus sp.…”

Section: Literature Survey On Methods Of Treatmentmentioning

confidence: 99%

Decolourisation of Metal-azo Dyes in Wastewaters by Sodium Peroxodisulphate: A Template for Experimental Investigations

Cheung,

Williams,

Kirk

et al. 2023

TOECOLJ

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Background: It has long been recognized that the presence of azo metal complex dyes and their non-complexed counterparts in wastewaters, which is due to their manufacturing and use in the textile industries, renders natural waterways intensely coloured, and is therefore aesthetically unacceptable. Azo dye moieties are also known to be precursors of human carcinogenicity. Objective: This work aimed at the decolourisation of metal-azo dyes present in wastewaters so that pollution of natural bodies of water can be prevented. Decolourisation is indicative of the destruction of the metal-ligand complex, allowing the retrieval of transition metal ions, which are also water contaminants. Fracturing of the azo bond itself minimizes the potential for the carcinogenicity of these dyes. Methods: Decolourisation is achieved by the oxidative action of free radicals furnished by Na2S2O8, the sodium salt of peroxodisulphuric acid (Marshall’s acid). Raman spectroscopy characterizes the dye (ligand) known as “Eriochrome Black T (EBT)” by a peak at 1425 cm-1. Dismantling of its molecular structure by peroxodisulphate will lead to decolourisation accompanied by the collapse of the peak. Concomitantly, as EBT ligands fracture and cease to chelate, metallic ions are released, oxidized to a higher oxidation state, and precipitated as insoluble compounds in alkaline media. Results: The concentration of metallic ions in the aqueous phase has been found to be substantially reduced. The successfully treated dye solutions are mostly clear and colourless; their Beer-Lambert absorbances are in the range of 0.02 ≤ absorbance ≤ 0.05. The treatment of Ni(II), Co(II) and Fe(II)-EBT solutions is straightforward; the Cu(II) and Cr(III)-EBT solutions require additional treatment to be included in the above absorbance range. The Cr(III)-EBT is the least responsive to treatment. Fracturing of the azo bond is evinced by Raman Spectroscopy. Conclusion: A template to investigate the feasibility of decolourisation of metal-complex dye solutions is pioneered and recommended.

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“…[178][179][180][181][182][183][184][185][186] Wide bandgap energy (3.2 eV) of ZnO restricts its photocatalytic performance to UV irradiation only. [187][188][189][190][191] To enhance photocatalytic performance and its ability to absorb sunlight, different photocatalyst composites (ZnO/BiOX) have been synthesized. 155,[192][193][194] Geng et al prepared various BiOBr/ZnO materials through hydrothermal method of methylene blue (MB) removal in its aqueous phase.…”

Section: Bismuth Oxyhalides Based Binary Compositesmentioning

confidence: 99%

A review on bismuth oxyhalide based materials for photocatalysis

et al. 2021

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Exploring the Outcomes of Sulphur Sources on ZnO/CdS Nanocomposites Towards Photocatalytic Degradation of Mordant Black 11 Dye

Cited by 7 publications

References 32 publications

Confined Space Dual‐Type Quantum Dots for High‐Rate Electrochemical Energy Storage

Confined Space Dual‐Type Quantum Dots for High‐Rate Electrochemical Energy Storage

Decolourisation of Metal-azo Dyes in Wastewaters by Sodium Peroxodisulphate: A Template for Experimental Investigations

A review on bismuth oxyhalide based materials for photocatalysis

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