Doping zinc oxide (ZnO) nanoparticles with molybdenum boosts photocatalytic degradation of Rhodamine b (RhB): Particle characterization, degradation kinetics and aquatic toxicity testing

Kohzadi, Shadi; Maleki, Afshin; Bundschuh, Mirco; Vahabzadeh, Zakaria; Johari, Seyed Ali; Rezaee, Reza; Shahmoradi, Behzad; Marzban, Nader; Amini, Nader

doi:10.1016/j.molliq.2023.122412

Cited by 20 publications

(8 citation statements)

References 64 publications

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“…The prominent peak at 548 cm −1 corresponds to the stretching vibrations of Zn-O bonds, characteristic of the Zn-O stretching frequency in octahedral coordination. 23 Fig. 4(B) depicts the photoluminescence (PL) spectrum of porous ZnO coral-like nanoplates excited at 325 nm using a helium-cadmium (He-Cd) laser.…”

Section: Resultsmentioning

confidence: 99%

Enhanced photocatalytic efficiency of porous ZnO coral-like nanoplates for organic dye degradation

Hanh,

Thi Minh Nguyet,

Van Chinh

et al. 2024

RSC Adv.

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Section: Resultsmentioning

confidence: 99%

Enhanced photocatalytic efficiency of porous ZnO coral-like nanoplates for organic dye degradation

Hanh,

Thi Minh Nguyet,

Van Chinh

et al. 2024

RSC Adv.

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“…The photocatalytic oxidation method, physical coagulation method, Fenton oxidation method, and biodegradation method are now the most frequently used techniques for treating dye wastewater [2,[12][13][14][15][16]. Among these treatment techniques, the semiconductor-based photocatalytic oxidation approach offers the advantages of stability, non-toxicity, high Nanomaterials 2024, 14, 926 2 of 21 efficiency, low energy consumption, and environmentally friendly features, which has drawn a lot of interest from researchers [17][18][19][20]. Solar-driven photocatalytic oxidation is a green and efficient wastewater treatment technology [13] that can degrade toxic pollutants by decomposing organic molecules into non-toxic carbon dioxide, water, and other small molecules [6,8].…”

Section: Introductionmentioning

confidence: 99%

“…They have the advantage of light corrosion resistance [ 3 ]. Many semiconductor metal oxides, like TiO 2 , Fe 2 O 3 , ZnO, and CuO, have been widely explored in the photocatalytic degradation process of organic dyes [ 12 , 17 ]. Among them, ZnO has received more attention due to its strong reducing ability and various morphologies [ 20 ].…”

Section: Introductionmentioning

confidence: 99%

Facile Preparation of Magnetically Separable Fe3O4/ZnO Nanocomposite with Enhanced Photocatalytic Activity for Degradation of Rhodamine B

Qi,

Wang,

Liu

et al. 2024

Nanomaterials

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Magnetic separation of photocatalysts holds great promise for water treatment. A magnetic separation method has a positive effect on the recovery of catalysts after degradation. In this paper, an efficient and reusable catalytic system is developed based on coating magnetic Fe3O4 by depositing Fe2+ on the surface of ZnO. The Fe3O4/ZnO nanocomposite exhibits enhanced performance for organic pollutant degradation. The Fe3O4/ZnO system demonstrates a high photocatalytic activity of 100% degradation efficiency in Rhodamine B (RhB) degradation under UV light irradiation for 50 min. The excellent photocatalytic activity is primarily due to the separation of photogenerated electron-hole pairs being facilitated by the strong interaction between Fe3O4 and ZnO. The induction of the magnetic Fe3O4 endows the Fe3O4/ZnO composite with superior magnetic separation capability from water. Experiments with different radical scavengers revealed that the hydroxyl radical (·OH) is the key reactive radical for the effective degradation of RhB. This work innovatively affords a common interfacial dopant deposition strategy for catalytic application in the degradation of organic dye pollutants and catalyst separation from wastewater efficiently.

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“…To improve ZnO photocatalytic activity and oxidation process, the latter should be prevented from producing electron/hole pairs, with the excited electron reacting with a pollutant [22]. Therefore, to overcome these challenges and improve the photocatalytic activity of ZnO, there is a need to support ZnO in terms of functionalization such as loading with other materials [23].…”

Section: Introductionmentioning

confidence: 99%

In-Situ Hydrothermal Fabrication of ZnO-Loaded GAC Nanocomposite for Efficient Rhodamine B Dye Removal via Synergistic Photocatalytic and Adsorptive Performance

Obayomi,

Lau,

Xie

et al. 2024

Preprint

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In this work, zinc oxide (ZnO)/ granular activated carbon (GAC) composites at different ZnO concentration (0.25M-ZnO@GAC, 0.5M-ZnO@GAC, and 0.75M-ZnO@GAC) were prepared by an in-situ hydrothermal method and demonstrated synergistic photocatalytic degradation and ad-sorption of Rhodamine B (RhB). The thermal stability, morphological structure, elemental com-position, crystallographic structure, and textural properties of developed catalysts were charac-terized by thermal gravimetric analysis (TGA/DTG), scanning electron microscopy equipped with energy dispersive-x-ray (SEM-EDS), x-ray diffraction (XRD), and Brunauer–Emmett–Teller (BET) analysis. Successful loading of ZnO onto GAC was confirmed by SEM-EDS and XRD analysis. The BET surface areas of GAC, 0.25M-ZnO@GAC, 0.5M-ZnO@GAC, and 0.75M-ZnO@GAC were 474 m2/g, 450 m2/g, 453 m2/g, and 421 m2/g, respectively. The decrease in GAC could be attributed to the successful loading of ZnO on the GAC surface. Notably, 0.5M-ZnO@GAC exhibited the best photocatalytic degradation efficiency of 82% and 97% under UV-A and UV-C light over 120 min, attributed to improved crystallinity and visible light absorption. The photocatalytic degradation parameters revealed that lowering the RhB concentration, raising the catalyst dosage and pH be-yond the point of zero charge (PZC) would favor the RhB degradation. Photocatalytic reusability was demonstrated over 5 cycles. Scavenger tests revealed that the hydroxyl radicals (•OH), su-peroxide radicals (O2−•), and photoinduced hole (h+) radicals play a major role during the RhB degradation process. Based on the TOC results, the RhB mineralization efficiency of 79.1% was achieved by 0.5M-ZnO@GAC. Additionally, GAC exhibited a strong adsorptive performance towards RhB with adsorption capacity and RhB removal of 487.1 mg/g and 99.5% achieved within 90 min equilibrium time. The adsorption characteristics were best described by pseu-do-second-order kinetics, suggesting chemical adsorption. This research offers a new strategy for the development of effective photocatalyst materials with potential for wider wastewater treat-ment applications.

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Doping zinc oxide (ZnO) nanoparticles with molybdenum boosts photocatalytic degradation of Rhodamine b (RhB): Particle characterization, degradation kinetics and aquatic toxicity testing

Cited by 20 publications

References 64 publications

Enhanced photocatalytic efficiency of porous ZnO coral-like nanoplates for organic dye degradation

Enhanced photocatalytic efficiency of porous ZnO coral-like nanoplates for organic dye degradation

Facile Preparation of Magnetically Separable Fe3O4/ZnO Nanocomposite with Enhanced Photocatalytic Activity for Degradation of Rhodamine B

In-Situ Hydrothermal Fabrication of ZnO-Loaded GAC Nanocomposite for Efficient Rhodamine B Dye Removal via Synergistic Photocatalytic and Adsorptive Performance

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