Synthesis and Characterization of Co–ZnO and Evaluation of Its Photocatalytic Activity for Photodegradation of Methyl Orange

Adeel, Muhammad; Saeed, Muhammad; Khan, Iltaf; Muneer, Majid; Akram, Nadia

doi:10.1021/acsomega.0c05092

Cited by 208 publications

(101 citation statements)

References 73 publications

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“…Several conventional methods have been used to treat wastewater, including biological treatment, anaerobic, aerobic, and electrochemical methods, oxidation, reduction, flotation, flocculation, precipitation, and adsorption. However, these methods cannot completely degrade organic pollutants [1][2][3][4][5][6]. Photocatalysis based on illumination of semiconductor powder for removal of organic contaminants from water is environmentally friendly and cost effective, and it has; therefore, attracted particular interest.…”

Section: Introductionmentioning

confidence: 99%

Hexagonal WO3·0.33H2O Hierarchical Microstructure with Efficient Photocatalytic Degradation Activity

Wang

Huang

et al. 2021

Catalysts

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Structural design and morphological control of semiconductors is considered to be one of the most effective ways to improve their photocatalytic degradation properties. In the present work, a hexagonal WO3·0.33H2O hierarchical microstructure (HWHMS) composed of nanorods was successfully prepared by the hydrothermal method. The morphology of the HWHMS was confirmed by field-emission scanning electron microscopy, and X-ray diffraction, Raman spectroscopy, and thermogravimetric analysis demonstrated that the synthesized product was orthorhombic WO3·0.33H2O. Owing to the unique hierarchical microstructure, the HWHMS showed larger Brunauer–Emmett–Teller (BET) surface and narrower bandgap (1.53 eV) than the isolated WO3·0.33H2O nanorods. Furthermore, the HWHMS showed enhanced photocatalytic activity for degradation of methylene blue under visible-light irradiation compared with the isolated nanorods, which can be ascribed to the narrower bandgap, larger BET specific surface area, and orthorhombic phase structure of the HWHMS. This work provides a potential protocol for construction of tungsten trioxide counterparts and materials similar to tungsten trioxide for application in gas sensors, photocatalysts, electrochromic devices, field-emission devices, and solar-energy devices.

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Section: Introductionmentioning

confidence: 99%

Hexagonal WO3·0.33H2O Hierarchical Microstructure with Efficient Photocatalytic Degradation Activity

Wang

Huang

et al. 2021

Catalysts

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“…6. If Co and Zn dissolve in identical proportions, it can be assumed that Co is uniformly doped in the zincite phase (Adeel et al, 2021). The peak of zincite (2Ɵ:68) disappears, in the XRD pattern of MSFT by the baking process and this peak substitutes with cobalt sulphate in the XRD patterns of B-MSFT.…”

Section: Extraction Of Base Metalsmentioning

confidence: 99%

Evaluation of sulphation baking and autogenous leaching behaviour of Turkish metallurgical slag flotation tailings

KART¹

2021

Physicochem. Probl. Miner. Process.

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Turkish metallurgical slag flotation tailing's (MSFT) that has not been evaluated yet sulphation baking phase transformations and autogenous leaching behaviour were investigated. The MSFT in the study consists of the residual fayalite (FeO•SiO2) phase from the flotation, with a copper recovery of 87%, of the slag released during the smelting of the copper sulphide mine in northern Turkey, and the non-soluble glassy/amorphous structure containing the 0.34%Cu, 4.16%Zn and 0.15%Co base metals locked and doped to this phase. The effects of temperature (350 -650°C) and sulphuric acid dosages (4-10 ml) on sulphation baking were investigated by X-ray diffraction and sulphur analyses of the baked MSFT (B-MSFT) to produce soluble base metal sulphates. Since sulphated metals are a kind of metal salt, autogenous leaching was applied to the B-MSFTs only with purified water to dissolute copper, zinc and cobalt. X-ray diffraction patterns show the transformation of fayalite to oxide and sulphate phases due to sulphation baking. All dissolution values of Co and Zn obtained by autogenous leaching of B-MSFTs produced under all determined conditions are almost the same as one another. This indicates that Co and Zn are doped to fayalite together and that part of cobalt is doped to the zincite structure and liberated and sulphated together. This study showed that MSFTs decompose leading to liberation and sulphation of the doped base metals in its structure at a rate of ≥90%, and that they autogenously dissolve under atmospheric conditions leading to recovery in a simple and economic manner.

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“…It was found that catalytic activity decreased with increase in initial concentration of rhodamine B dye. The decrease in catalytic activity with increase in concentration of dye is due to three reasons (Balcha et al 2016) (Saeed et al 2017) (Nisar et al 2021) (Adeel et al 2021):…”

Section: Effect Of Concentrationmentioning

confidence: 99%

Co3O4-Bi2O3 heterojunction; An effective photocatalyst for photodegradation of rhodamine B dye

Saeed

Baig

Jamal

et al. 2021

Preprint

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Recently, the research on development of visible-light-active photocatalysts for photodegradation of organic pollutants has got much attention. Therefore, this study reports the synthesis of Co3O4-Bi2O3 heterojunction as visible-light responsive photocatalyst for photodegradation of rhodamine B dye. The Co3O4-Bi2O3 heterojunction was synthesized by coprecipitation method and characterized by XRD, EDS, SEM, TGA and FTIR. The as prepared Co3O4-Bi2O3 heterojunction was utilized as photocatalyst for photodegradation of rhodamine B dye using a 100 mg/L solution. It was observed that Co3O4-Bi2O3 showed best catalytic performance with ~ 92% degradation of rhodamine B dye than Co3O4 and Bi2O3 with 14 and 34% removal of rhodamine B dye, respectively. The rate constant for Co3O4-Bi2O3 catalyzed photodegradation of rhodamine B was 6 times and 3 times higher than rate constant for Co3O4 catalyzed and Bi2O3 catalyzed photodegradation of rhodamine B, respectively. The pH 8 was found as optimum pH for Co3O4-Bi2O3 catalyzed photodegradation of rhodamine B dye.

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Synthesis and Characterization of Co–ZnO and Evaluation of Its Photocatalytic Activity for Photodegradation of Methyl Orange

Cited by 208 publications

References 73 publications

Hexagonal WO3·0.33H2O Hierarchical Microstructure with Efficient Photocatalytic Degradation Activity

Hexagonal WO3·0.33H2O Hierarchical Microstructure with Efficient Photocatalytic Degradation Activity

Evaluation of sulphation baking and autogenous leaching behaviour of Turkish metallurgical slag flotation tailings

Co3O4-Bi2O3 heterojunction; An effective photocatalyst for photodegradation of rhodamine B dye

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