Pristine and Graphene-Quantum-Dots-Decorated Spinel Nickel Aluminate for Water Remediation from Dyes and Toxic Pollutants

Regulska, Elżbieta; Breczko, Joanna; Basa, Anna

doi:10.3390/w11050953

Cited by 26 publications

(17 citation statements)

References 39 publications

(48 reference statements)

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“…Figure 4a it is possible to see that the degradations of RhB dye molecules also occurred under the action of visible light only; however, this occurred under a low conversion rate which explains the 8.2(5)% degradation over 90 min exposure to visible light result. In addition, there was interaction of dye chains on the surface of the microcrystals, which underwent the degradation by the action of holes, a process which has been reported in the literature [37].…”

Section: Photolysismentioning

confidence: 75%

High Photocatalytic Activity under Visible Light for a New Morphology of Bi2WO6 Microcrystals

et al. 2019

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In this work, a new morphology was obtained for bismuth tungstate (Bi 2 WO 6 -glyc) using a hydrothermal method with the addition of glycerol as a surfactant. In order to compare, the bismuth tungstate without glycerol as the surfactant, i.e., Bi 2 WO 6 , was synthesized. Structural characterization by XRD and Rietveld refinement confirmed the orthorhombic structure as a single phase for all samples with high crystallinity. All active modes in Raman spectroscopy for the orthorhombic phase of bismuth tungstate were confirmed in agreement with XRD analysis. N 2 adsorption/desorption and size pore distribution confirmed the high surface area (85.7 m 2 /g) for Bi 2 WO 6 -glyc when compared with Bi 2 WO 6 (8.5 m 2 /g). The optical band gap by diffuse reflectance was 2.78 eV and 2.88 eV for Bi 2 WO 6 -glyc and Bi 2 WO 6 , respectively. SEM images confirmed the different morphology for these materials, and microstructures with cheese crisp were observed for Bi 2 WO 6 -glyc (cheese crisp). On the other hand, flower-like microcrystals were confirmed for Bi 2 WO 6 sample. The photocatalytic performance of Bi 2 WO 6 -glyc (94.2%) in the photodegradation of rhodamine B (RhB) dye solutions at 60 min was more expressive than Bi 2 WO 6 (81.3%) and photolysis (8.2%) at 90 min.

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Section: Photolysismentioning

confidence: 75%

High Photocatalytic Activity under Visible Light for a New Morphology of Bi2WO6 Microcrystals

et al. 2019

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“…The photocatalytic mechanism of the ZnGa 2 O 4 with the Au cocatalyst was investigated by experimental examination as well (See Figure 7). The generation of superoxide anions, holes and hydroxyl radicals was measured via the inhibition reaction with p-benzoquinone (BQ), disodium ethylenediaminetetraacetate (EDTA-2Na), and isopropanol (IPA) as respective scavengers [32,33]. Hence, we can confirm that the hydroxyl radical plays an important role in the photodegradation of RhB.…”

Section: Introductionmentioning

confidence: 78%

The Improvement of Coralline-Like ZnGa2O4 by Cocatalysts for the Photocatalytic Degradation of Rhodamine B

et al. 2020

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To date, various methods have been used to synthesize ZnGa 2 O 4 material to promote photodegradation performance. However, cocatalysts, which usually play a crucial role in the photocatalyst system, have not been studied extensively in photocatalytic degradation reactions. In this paper, ZnGa 2 O 4 semiconducting material was synthesized by a traditional high-temperature solid-state reaction. The as-prepared powder was characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and ultraviolet-visible diffused reflectance spectroscopy. The results indicate that the as-prepared sample is a highly crystallized granular sample with a bandgap of 4.44 eV and a uniform particle size distribution. Density functional theory (DFT) was utilized to calculate the electronic structure of ZnGa 2 O 4 . The valence bands and conduction bands were chiefly composed of O 2p atomic orbitals and the hybridization orbitals of Ga 4s4p and Zn4s4p, respectively. The photocatalytic performance was tested via the decomposition of rhodamine B (RhB) under the irradiation of ultraviolet light. Cu, Ag, Au, Ni, Pt, and Pd cocatalysts were loaded on the ZnGa 2 O 4 photocatalyst by a photodeposition method. The relatively optimal cocatalyst of ZnGa 2 O 4 in the photocatalytic degradation reaction is Au. Thereafter, the effect of loading different usage amounts of the Au cocatalyst for the photodegradation of the ZnGa 2 O 4 photocatalyst was studied in detail. The experimental results displayed that the optimum photodegradation activity was confirmed with the 3 wt% Au/ZnGa 2 O 4 sample, which was 14.1 times more than the unloaded photocatalyst. The maximum photocatalytic degradation ratio of RhB was 96.7%, with 180 min under ultraviolet light.

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“…The Special Issue consists of nine papers describing a wide spectrum of research related to the removal of environmentally significant pollutants from aqueous samples and their determination in various matrices. The presented articles can be classified into three broad thematic sectors related to the topic of the special issue: new methods of isolation and determination of compounds from the EOCs group [22][23][24], occurrence of EOCs in the water environment [24,25], and new approaches to the degradation of significant water pollutants or their removal [26][27][28][29][30].…”

Section: Overview Of the Special Issuementioning

confidence: 99%

“…It was stated that SO 4 • − radicals are most efficient and caused DOX degradation in a very short time. The application of a new photocatalyst for the degradation of a selected organic compound was proposed by Regulska et al [29]. The authors examined the photochemical properties of crystalline NiAl 2 O 4 decorated with graphene quantum dots.…”

Section: New Approaches To Degradation Of Water Pollutantsmentioning

confidence: 99%

Removal of Organic Pollution in the Water Environment

Karpińska

Kotowska

2019

Water

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The development of civilization entails a growing demand for consumer goods. A side effect of the production and use of these materials is the production of solid waste and wastewater. Municipal and industrial wastewater usually contain a large amount of various organic compounds and are the main source of pollution of the aquatic environment with these substances. Therefore, the search for effective methods of wastewater and other polluted water treatment is an important element of caring for the natural environment. This Special Issue contains nine peer-review articles presenting research on the determination and removal of environmentally hazardous organic compounds from aqueous samples. The presented articles were categorized into three major fields: new approaches to the degradation of water pollutants, new methods of isolation and determination of the emerging organic contaminants (EOCs), and the occurrence of EOCs in the water environment. These articles present only selected issues from a very wide area, which is the removal of organic pollution in water environment, but can serve as important references for future studies.

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Pristine and Graphene-Quantum-Dots-Decorated Spinel Nickel Aluminate for Water Remediation from Dyes and Toxic Pollutants

Cited by 26 publications

References 39 publications

High Photocatalytic Activity under Visible Light for a New Morphology of Bi2WO6 Microcrystals

High Photocatalytic Activity under Visible Light for a New Morphology of Bi2WO6 Microcrystals

The Improvement of Coralline-Like ZnGa2O4 by Cocatalysts for the Photocatalytic Degradation of Rhodamine B

Removal of Organic Pollution in the Water Environment

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