Fabrication of Silica‐Supported Al‐Doped ZnO and Its Use in the Elimination of the Toxic Organic Ingredients from Industrial Effluents

Shahid, Muhammad; Bashir, Sheraz; Habib, Amir; Jamil, Akmal; Afzal, Adeel; Iqbal, Naseer

doi:10.1002/slct.202102291

Cited by 10 publications

(5 citation statements)

References 45 publications

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“…[9][10][11][12] However, the photocatalytic efficiency of ZnO is limited owing to its wide bandgap, low utilization of sunlight, and rapid recombination of photogenerated electrons and holes. [13][14][15][16][17] Many studies have shown that the photocatalytic performance of ZnO can be improved by noble metal deposition, [18,19] metal ion doping, [20][21][22] and heterojunction fabrication. [23][24][25] Among them, the construction of heterojunction is considered the simplest and most effective method.…”

Section: Introductionmentioning

confidence: 99%

“…ZnO is one of the most widely investigated semiconductor photocatalysts because of its chemical stability, nontoxicity, and low cost [9–12] . However, the photocatalytic efficiency of ZnO is limited owing to its wide bandgap, low utilization of sunlight, and rapid recombination of photogenerated electrons and holes [13–17] . Many studies have shown that the photocatalytic performance of ZnO can be improved by noble metal deposition, [18,19] metal ion doping, [20–22] and heterojunction fabrication [23–25] .…”

Section: Introductionmentioning

confidence: 99%

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Enhanced Photocatalytic Performance of a ZnO/CdS Heterostructure for Hydrogen Production and Mixed Dye Degradation

Guo

Lü

et al. 2023

ChemistrySelect

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ZnO/CdS composite was prepared using a simple one‐step hydrothermal method, and its photocatalytic performance was investigated under different conditions. The photocatalytic efficiency of ZnO/CdS was 6345.04 μmol ⋅ g−1 ⋅ h−1 in H2 production from water splitting using Na2S and Na2SO3 as sacrificial agents. The photocatalytic efficiency of eosin Y‐sensitized ZnO/CdS was 6939.39 μmol ⋅ g−1 ⋅ h−1 when triethanolamine was used as a sacrificial agent. The photocatalytic activity of ZnO/CdS was better than those of pristine ZnO and CdS during H2 evolution. The ZnO/CdS composite also exhibited superior photocatalytic activity compared to pristine ZnO and CdS in the degradation of a mixed dye pollutant. The degradation rates of methylene blue, rhodamine B, and orange G in the mixed dye after 120 min of irradiation were 99.41 %, 92.96 %, and 65.74 %, respectively. Possible mechanisms for photocatalytic H2 production and photocatalytic degradation of organic pollutants have been proposed.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Enhanced Photocatalytic Performance of a ZnO/CdS Heterostructure for Hydrogen Production and Mixed Dye Degradation

Guo

Lü

et al. 2023

ChemistrySelect

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“…To reduce the impact of organic pollutants on the environment and health, photocatalysis-light-induced chemical reactions to oxidize and decompose organic molecules-is developed (Ameta et al, 2018;Zhang et al, 2018). The photoactive nanomaterials can be used as heterogeneous catalysts as well as self-cleaning coatings to remove hazardous organic molecules from the wastewaters (Purcar et al, 2021;Shahid et al, 2021Shahid et al, , 2022 or contaminated surfaces (Afzal et al, 2021;Tănase et al, 2021). A variety of nanostructured materials have been developed for the photocatalytic degradation of organic pollutants such as those based on carbon nanostructures (Khan, 2021), titania (Chen et al, 2020;Varma et al, 2020), or zinc oxide (Qi et al, 2017;Majumder et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

ZnO/Zn(OH)2 nanoparticles and self-cleaning coatings for the photocatalytic degradation of organic pollutants

Faheem

Siddiqi

Habib

et al. 2022

Front. Environ. Sci.

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Zinc oxide (ZnO) nanostructures have emerged as efficient heterogeneous photocatalysts for the degradation of organic pollutants in aqueous solutions and industrial wastewaters. In this work, a simple and effective method is reported for the synthesis of zinc oxide/zinc hydroxide (ZnO/Zn(OH)2) hybrid nanoparticles using a mineral acid to enhance the photocatalytic activity of ZnO. Infrared spectroscopy reveals the presence of hydroxyl groups in ZnO/Zn(OH)2 nanoparticles. X-ray diffraction shows the formation of hexagonal wurtzite ZnO nanoparticles, which retain their wurtzite structure after acid treatment but additional diffractions for Zn(OH)2 are also recorded. The optical bandgap of resulting ZnO and ZnO/Zn(OH)2 nanoparticles is reduced to 3.05 and 3.08 eV, respectively. In the initial photocatalysis experiments, ZnO/Zn(OH)2 nanoparticles exhibit 3.5-times improved degradation and removal of sunset yellow dye, a model organic pollutant, from deionized water compared to pristine ZnO nanoparticles. Hence, for further studies, ZnO/Zn(OH)2 coatings are fabricated on glass slides with a uniform surface morphology as shown by the atomic force microscopy. The time-dependent UV-visible spectroscopy reveals the photocatalytic degradation of sunset yellow over the surface of ZnO/Zn(OH)2 coatings. The degradation reaction follows the pseudofirst-order mechanism with a rate constant of 2.9 × 10–2 min−1. The recyclability and stability experiments reveal the retention of appreciable photocatalytic activity of ZnO/Zn(OH)2 coatings (with >92% degradation efficiency after six successive cycles). The results are compared with recent examples from the pertinent literature. The surface hydroxyl groups on ZnO/Zn(OH)2 nanoparticles and bandgap lowering enhance the anchoring of dye molecules and electron transfer reactions.

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“…One technique to improve the photocatalytic activity of metal oxide photocatalysts is to dope them with transition metal ions. Recently, the doping of ZnO with Al 3+ led to a lowering of the bandgap of the composites and improved the surface properties, which contributed to a lower charge-transfer resistance, efficient charge-carrier separation and transfer, and slower electron-hole recombination [12].…”

Section: Introductionmentioning

confidence: 99%

Ni-Doped In2O3 Nanoparticles and Their Composite with rGO for Efficient Degradation of Organic Pollutants in Wastewater under Visible Light Irradiation

Habib

Khan

Zubair

et al. 2023

IJMS

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The efficient degradation of organic effluent is always desirable when using advanced photocatalysts with enhanced activity under visible light. Nickel-doped indium oxide (Ni-In2O3) is synthesized via a hydrothermal route as well as its composites with reduced graphene oxide (rGO). Facile synthesis and composite formation methods lead to a well-defined morphology of fabricated nanocomposite at low temperatures. The bandgap energy of indium oxide lies in the range of 3.00–4.30 eV. Its high light absorption capacity, high stability, and non-toxicity make it a choice as a photocatalyst that is active under visible light. The transition metal Ni-doping changes the indium oxide’s chemical, optical, and physicochemical properties. The Ni-In2O3 and rGO composites improved the charge transport and reduced the charge recombination. The phase analysis of the developed photocatalysts was performed using X-ray diffraction (XRD), and the morphological and structural properties were observed using advanced microscopic techniques (SEM and TEM), while UV-vis and FTIR spectroscopic techniques were used to confirm the structure and optical and chemical properties. The electrochemical properties of the photocatalysts were investigated using cyclic voltammetry (CV), linear sweep voltammetry (LSV), and electrochemical impedance spectroscopy (EIS), and the charge-transfer properties of the obtained photocatalysts and the mechanism of the photocatalytic degradation mechanism of methylene blue, a common dye used in the dyeing industry, were determined.

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Fabrication of Silica‐Supported Al‐Doped ZnO and Its Use in the Elimination of the Toxic Organic Ingredients from Industrial Effluents

Cited by 10 publications

References 45 publications

Enhanced Photocatalytic Performance of a ZnO/CdS Heterostructure for Hydrogen Production and Mixed Dye Degradation

Enhanced Photocatalytic Performance of a ZnO/CdS Heterostructure for Hydrogen Production and Mixed Dye Degradation

ZnO/Zn(OH)2 nanoparticles and self-cleaning coatings for the photocatalytic degradation of organic pollutants

Ni-Doped In2O3 Nanoparticles and Their Composite with rGO for Efficient Degradation of Organic Pollutants in Wastewater under Visible Light Irradiation

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