Synthesis of cobalt and sulphur doped titanium dioxide photocatalysts for environmental applications

Hafeez, Muhammad; Afyaz, Sumera; Khalid, Awais; Ahmad, Pervaiz; Khandaker, Mayeen Uddin; Sahibzada, Muhammad Umar Khayam; Ahmad, Israr; Khan, Jahanzeb; Alhumaydhi, Fahad A.; Emran, Talha Bin; Idris, Abubakr M.

doi:10.1016/j.jksus.2022.102028

Cited by 25 publications

(15 citation statements)

References 44 publications

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“…Chemical dye, organic and mineral materials, and synthetic dye all come from industrial, urban, and agricultural resources, with chemical dye being the maximum harmful pollutant emanating from fabric industries [1][2][3]. Many industries use water treatment plants to eliminate pollution from wastewater at a small price for environmental benefits [4][5][6]. is helps to improve and conserve the quality of water for drinking and other purposes.…”

Section: Introductionmentioning

confidence: 99%

[Retracted] Effect of Cu Doping on ZnO Nanoparticles as a Photocatalyst for the Removal of Organic Wastewater

Khalid

Ahmad

Khan

et al. 2022

Bioinorganic Chemistry and Applications

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Environmental problems with chemical and biological water pollution have become a major concern for society. Providing people with safe and affordable water is a grand challenge of the 21st century. The study investigates the photocatalytic degradation capabilities of hydrothermally prepared pure and Cu-doped ZnO nanoparticles (NPs) for the elimination of dye pollutants. A simple, cost-effective hydrothermal process is employed to synthesize the Cu-doped ZnO NPs. The photocatalytic dye degradation activity of the synthesized Cu-doped ZnO NPs is tested by using methylene blue (MB) dye. In addition, the parameters that affect photodegradation efficiency, such as catalyst concentration, starting potential of hydrogen (pH), and dye concentration, were also assessed. The dye degradation is found to be directly proportional to the irradiation time, as 94% of the MB dye is degraded in 2 hrs. Similarly, the dye degradation shows an inverse relation to the MB dye concentration, as the degradation reduced from 94% to 20% when the MB concentration increases from 5 ppm to 80 ppm. The synthesized cost-effective and environmentally friendly Cu-doped ZnO NPs exhibit improved photocatalytic activity against MB dye and can therefore be employed in wastewater treatment materials.

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Section: Introductionmentioning

confidence: 99%

[Retracted] Effect of Cu Doping on ZnO Nanoparticles as a Photocatalyst for the Removal of Organic Wastewater

Khalid

Ahmad

Khan

et al. 2022

Bioinorganic Chemistry and Applications

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“…Doping of zinc oxide with selenium [152] and silver [153] enhances the photocatalytic performance of the nanocomposite and results in a significant reduction or complete removal of heavy metals, such as: Cd, Ni, Pb, Zn, Cu, Cr from the aqueous environment. Modification of titanium(IV) oxide surface with silica [154], graphene [155], organic acids [156], and sulfur compounds [157] also allows the elimination of heavy metals from the reaction mixture.…”

Section: Heterogeneous Photocatalysis In the Removal Of Heavy Metalsmentioning

confidence: 99%

Synthesis, Characterization and Applications of Sustainable Advanced Nanomaterials

2023

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“…Clean water is vital to human existence, as all domestic, commercial, and industrial operations require it as a fundamental necessity. To achieve environmental benefits at a reasonable cost, several industries employ water treatment facilities to eliminate pollution from wastewater [2]. This approach aids in enhancing water quality for various purposes, including drinking.…”

Section: Introductionmentioning

confidence: 99%

Tuning the Optical Properties of ZnO by Co and Gd Doping for Water Pollutant Elimination

Safeen

Safeen²,

Arif³

et al. 2023

Water

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In the present study, pure, Co, Gd, and Co/Gd di-doped ZnO nanoparticles were synthesized via the co-precipitation synthesis route. The prepared samples were characterized through different techniques such as the X-ray diffraction method (XRD), scanning electron microscopy (SEM), UV-Vis spectroscopy, photoluminescence (PL)spectroscopy, and an impedance analyzer and vibrating sample magnetometer (VSM). The XRD pattern shows ZnO’s wurtzite hexagonal crystal structure; moreover, the shifting of characteristic peaks toward the lower angle indicates the inclusion of Co and Co/Gd in the ZnO host lattice. SEM micrographs show various morphologies such as rods, the agglomeration of particles, and spherical nanoparticles. The UV-Vis spectroscopy reveals that the absorption increased in the visible region and there was a substantial redshift for the doped samples. The bandgap decreased from 3.34 to 3.18 eV for the doped samples. The PL spectra show near-edge and inter-band transitions; the origin of inter-band transitions is attributed to the defect states present within the bands. The dielectric constant is strongly frequency dependent and decreases with Co and Co/Gd doping, while the electrical conductivity increases. A VSM study indicates that pure ZnO is diamagnetic, while the Co and Co/Gd doped ZnO nanoparticles showed ferromagnetic behavior. Under UV-visible light irradiation, the Co/Gd-ZnO nanoparticles showed higher photocatalytic activity than the ZnO nanoparticles. The enhanced photocatalytic activity may be attributed to a decreased bandgap with doping.

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Synthesis of cobalt and sulphur doped titanium dioxide photocatalysts for environmental applications

Cited by 25 publications

References 44 publications

[Retracted] Effect of Cu Doping on ZnO Nanoparticles as a Photocatalyst for the Removal of Organic Wastewater

[Retracted] Effect of Cu Doping on ZnO Nanoparticles as a Photocatalyst for the Removal of Organic Wastewater

Synthesis, Characterization and Applications of Sustainable Advanced Nanomaterials

Tuning the Optical Properties of ZnO by Co and Gd Doping for Water Pollutant Elimination

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