Experimental and computational study of metal oxide nanoparticles for the photocatalytic degradation of organic pollutants: a review

Geldasa, Fikadu Takele; Kebede, Mesfin Abayneh; Shura, Megersa Wodajo; Hone, Fekadu Gashaw

doi:10.1039/d3ra01505j

Cited by 53 publications

(18 citation statements)

References 274 publications

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“…Over the past few years, nanostructured molybdenum oxides (MoO 3-y ) and molybdenum sulfides (MoS x ) have emerged as highly promising materials across diverse applications, such as photocatalysis [1][2][3][4], photodetector [5,6], photoelectrochemical [7][8][9][10][11], supercapacitor [12], gas sensor [13,14], and organic/inorganic pollutants decomposition [9,[15][16][17]. Notably, various forms of MoO 3-y and MoS x compounds [9,16,17] exhibit remarkable catalytic properties due to their high carrier mobility, exceptional thermal stability, rapid and efficient separation/transfer of photoexcited electron-hole pair, as well as cost-effectiveness and environmental friendliness [18][19][20][21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of multi-phases MoO₃-MoS₂-Mo₂S₃ nanostructure catalyst for degradation of methylene blue, rhodamine B, and crystal violet dyes

Nang,

Vu,

Nguyen

et al. 2024

Phys. Scr.

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In this work, we present the synthesis of multi-phase MoO3–MoSx (Mo–O–S) nanostructure as an outstanding photocatalyst through the straightforward hydrothermal method. The as-synthesized Mo–O–S nanostructure exhibited high purity and well-defined crystallite phases, featuring rods with average diameters ranging from 100–200 nm and thick flakes of 10–25 nm. The optical characterization of the as-prepared Mo–O–S nanostructure reveals four distinct emission peaks within the 520–680 nm wavelength range. The photocatalytic activity of the Mo–O–S nanostructure was evaluated through the degradation of rhodamine B (RhB), methylene blue (MB), and crystal violet (CV) dyes. The results unveil impressive degradation efficiencies, achieving 65%, 82%, and 89% after 180 min of exposure to UV irradiation for RhB, MB, and CV dyes, respectively. This pioneer investigation underscores the potential of the MoO3–MoSx nanostructure as a promising catalyst for the effective degradation of multiple dyes

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Section: Introductionmentioning

confidence: 99%

Synthesis of multi-phases MoO₃-MoS₂-Mo₂S₃ nanostructure catalyst for degradation of methylene blue, rhodamine B, and crystal violet dyes

Nang,

Vu,

Nguyen

et al. 2024

Phys. Scr.

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“…Titanium dioxide (TiO 2 ) is the most widely used and excellent photocatalytic material among various oxide materials [1]. Other semiconducting oxide nanoparticles, such as ZnO, WO 3 , Cu 2 O, CuO, SnO 2 , etc, are also reported for photocatalysis applications [2]. However, these semiconducting metal oxides have drawbacks, including rapid charge recombination, poor sensitivity with visible light irradiation, and nanoparticle aggregation that affects their applications as photocatalysts [3].…”

Section: Introductionmentioning

confidence: 99%

“…Thus, due to their wide bandgap, TiO 2 and ZnO showed low photocatalytic performance under the irradiation of visible light. For the enhancement of photocatalytic performance of semiconducting oxide nanoparticles, significant efforts such as metal or nonmetal doping, deposition of surface of oxide materials by metals or other metal oxides, control of materials morphology, compositing with carbon-based materials, and fabrication of superstructure mesocrystals have been made [2,3,5]. Among these, various metal doping has attracted much interest because through metals doping new impurity level is created, and the bandgap becomes narrow, thereby improving the photocatalytic activity under visible light irradiation.…”

Section: Introductionmentioning

confidence: 99%

Boosting photocatalytic activity of β-PbO nanoparticles through metal doping

Geldasa,

Kebede,

Shura

et al. 2024

Mater. Res. Express

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The current work focuses on the fabrication of pristine and metals (Co, Cu, Ni, Li, and Sn) doped β-PbO phase nanoparticles by cost-effective precipitation method. The properties of the produced nanoparticles were investigated using a variety of characterization techniques. The produced compound was a highly pure β-PbO phase, according to the XRD data. From the UV-Vis DRS the obtained bandgap of pristine β-PbO, Co, Cu, Ni, Li, and Sn doped β -PbO was 2.68 eV, 1.88 eV, 2.01 eV, 2.65 eV, 2.64 eV, and 2.70 eV, respectively. The doped samples with the lowest photoluminescence (PL) intensities show the reduced photogenerated electron-hole pair recombination, which increased the photocatalytic activity of β-PbO nanoparticles. The study of the surface morphology by SEM reveals the irregular distribution of the particles. In both pristine and doped nanoparticles, EDX verifies the existence of the expected elements. In comparison to pristine β-PbO, all doped β-PbO nanoparticles have enhanced photocatalytic activity for the degradation of methylene blue (MB) dye under the irradiation of visible light. Among the doped nanoparticles, Cu and Co-doped β-PbO demonstrated particularly high performance. After 80 minutes of irradiation, Cu and Co-doped β-PbO showed 99.45% and 99.39% degradation rates of MB dye, compared to only 75.13% for pure β-PbO. Hence, the photocatalytic activity of pure β-PbO is boosted through metals doping due to bandgap narrowing, generation of impurity states, increased specific surface area, higher carrier concentration, reduced carriers recombination, the action of dopant ions, and microstructural changes.

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“…However, these processes have disadvantages such as generating secondary pollutants, low removal efficiency, and high cost, hindering their commercialization. 8,9 Methods such as the advanced oxidation process (AOP) and semiconductor-based photocatalysis have gained popularity in treating organic pollutants. AOP generates reactive oxidizing species, whereas photocatalysis utilizes the catalyst's photocatalytic activity to degrade pollutants.…”

Section: Introductionmentioning

confidence: 99%

“…Techniques such as adsorption, coagulation, membrane filtration, and sedimentation treat organic dye effluent. However, these processes have disadvantages such as generating secondary pollutants, low removal efficiency, and high cost, hindering their commercialization. , …”

Section: Introductionmentioning

confidence: 99%

Unveiling an Energy Efficient Solar-Driven Nanophotocatalyst: Z-Scheme-Based CdFe₂O₄@CuBi₂O₄ Heterostructure for MB and RhB Dye Degradation

Bhakar,

Rajpurohit,

Panchal

et al. 2024

ACS Appl. Eng. Mater.

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We developed a Z-scheme-based CdFe 2 O 4 @ CuBi 2 O 4 nanocomposite for efficient photocatalytic degradation of methylene blue (MB) and Rhodamine B (RhB) dyes under visible light. The Z-scheme heterojunction was meticulously constructed by integrating CuBi 2 O 4 and CdFe 2 O 4 nanoparticles with varying mass ratios. The photocatalytic degradation experiment revealed that 98.48% of the MB dye was degraded in 80 min, whereas 98.70% of the RhB dye was degraded in 70 min. The nanocomposite's enhanced photocatalytic activity and stability can be attributed to the synergistic effect of intimate heterogeneous interfacial contacts, which facilitated the separation and transfer of charge carriers, broadened the light absorption range, and boosted the redox ability of the photocatalyst. It involved direct oxidation by holes and indirect oxidation by reactive oxygen species (ROS), such as hydroxyl and superoxide radicals. The photocatalytic rate of reaction for the 20%-CdFe 2 O 4 @CuBi 2 O 4 nanocomposite was observed to be 0.0516 min −1 , which was 2.38 and 3.0 times higher than the pure CuBi 2 O 4 (0.0216 min −1 ) and CdFe 2 O 4 (0.0169 min −1 ), respectively. The developed nanocomposite showed a good photolytic performance in binary dye solutions of different concentrations and reusability for at least four cycles. It also achieved satisfactory results in tap water (98.33%), river water (95.82%), and wastewater (86.12%). This study highlights the potential of a synthesized nanocomposite as an energy-efficient photocatalyst for degrading MB and RhB dyes from wastewater under visible light. KEYWORDS: Z-scheme heterojunction, CdFe 2 O 4 @CuBi 2 O 4 nanocomposite, photocatalytic degradation, methylene blue dye, visible light irradiation

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Experimental and computational study of metal oxide nanoparticles for the photocatalytic degradation of organic pollutants: a review

Abstract: Photocatalysis is a more proficient technique that involves the breakdown or decomposition of different organic contaminants, various dyes, and harmful viruses and fungi using UV or visible light solar spectrum.

Cited by 53 publications

References 274 publications

Synthesis of multi-phases MoO₃-MoS₂-Mo₂S₃ nanostructure catalyst for degradation of methylene blue, rhodamine B, and crystal violet dyes

Synthesis of multi-phases MoO₃-MoS₂-Mo₂S₃ nanostructure catalyst for degradation of methylene blue, rhodamine B, and crystal violet dyes

Boosting photocatalytic activity of β-PbO nanoparticles through metal doping

Unveiling an Energy Efficient Solar-Driven Nanophotocatalyst: Z-Scheme-Based CdFe₂O₄@CuBi₂O₄ Heterostructure for MB and RhB Dye Degradation

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Experimental and computational study of metal oxide nanoparticles for the photocatalytic degradation of organic pollutants: a review

Abstract: Photocatalysis is a more proficient technique that involves the breakdown or decomposition of different organic contaminants, various dyes, and harmful viruses and fungi using UV or visible light solar spectrum.

Cited by 53 publications

References 274 publications

Synthesis of multi-phases MoO3-MoS2-Mo2S3 nanostructure catalyst for degradation of methylene blue, rhodamine B, and crystal violet dyes

Synthesis of multi-phases MoO3-MoS2-Mo2S3 nanostructure catalyst for degradation of methylene blue, rhodamine B, and crystal violet dyes

Boosting photocatalytic activity of β-PbO nanoparticles through metal doping

Unveiling an Energy Efficient Solar-Driven Nanophotocatalyst: Z-Scheme-Based CdFe2O4@CuBi2O4 Heterostructure for MB and RhB Dye Degradation

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Synthesis of multi-phases MoO₃-MoS₂-Mo₂S₃ nanostructure catalyst for degradation of methylene blue, rhodamine B, and crystal violet dyes

Synthesis of multi-phases MoO₃-MoS₂-Mo₂S₃ nanostructure catalyst for degradation of methylene blue, rhodamine B, and crystal violet dyes

Unveiling an Energy Efficient Solar-Driven Nanophotocatalyst: Z-Scheme-Based CdFe₂O₄@CuBi₂O₄ Heterostructure for MB and RhB Dye Degradation