Green ZnO nanorod material for dye degradation and detoxification of pharmaceutical wastes in water

Mohammed, Reem; Ali, Md. Eaqub; Gomaa, Eman Zakaria; Moh́sen, M.

doi:10.1016/j.jece.2020.104295

Cited by 50 publications

(15 citation statements)

References 20 publications

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“…The micrographs of ZnO nanoparticles are shown in Figure 1. The ZnO N (Figure 1a) showed that nanorods are shaped with agglomerated irregular nanoparticles of diverse size similar to those reported in the literature [33,34]. On the other hand, ZnO A (Figure 1b) exhibited an amorphous rod-like form [35].…”

Section: Scanning Electron Microscopy (Sem) Analysissupporting

confidence: 79%

Effect of the Precursor on the Synthesis of ZnO and Its Photocatalytic Activity

et al. 2022

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Zinc nitrate (ZnON) and zinc acetate (ZnOA) were used as precursors for the synthesis of zinc oxide (ZnO) nanoparticles by the sol–gel method. The ZnO powder was characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), UV–vis diffuse reflectance spectroscopy, X-ray diffraction (UV–Vis DRS), Fourier transform infrared spectroscopy (FTIR), physisorption of nitrogen, and X-ray photoelectron spectroscopy (XPS). On the other hand, the photocatalytic activity of the samples was tested in the degradation of 2,4-Dichlorophenoxyacetic acid (2,4-D) and 2,4-Dichlorophenol (2,4-DCP) under UV-light irradiation. The ZnON and ZnOA showed polycrystalline irregular structures and rod-like morphology with mean sizes of 40 and 99 nm, respectively. The precursor type influenced the bandgap, crystallite size, surface area, total pore volume, and pore diameter. The XPS results showed high contents of C and N in the ZnO samples, and as a consequence, the solids present remarkable differences in the C/N, O/C, and O/Zn atomic ratios, which significantly influenced the physicochemical characteristics. The ZnON and ZnOA exhibit photocatalytic properties against 2,4-D (74.7 and 90.9%, respectively) and 2,4-DCP (78.4 and 86.7%, respectively) and better performance of ZnOA. These results are promising and indicate the potential to use this material as a photocatalyst to degrade organic pesticides.

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Section: Scanning Electron Microscopy (Sem) Analysissupporting

confidence: 79%

Effect of the Precursor on the Synthesis of ZnO and Its Photocatalytic Activity

et al. 2022

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“…3 a. As illustrated in the figure that 3% CuS QDs @ ZnO is mainly composed of ZnO nanorod with rough surface covered with CuS nanoparticles which are different from the pristine ZnO in our previous publication 27 , 28 . It suggests that the CuS has a slight effect on the morphology and structure of ZnO NRs.…”

Section: Resultsmentioning

confidence: 77%

“…Zhu, Wenli, et al demonstrated the degradation of RhB dye over CuO–CuS–ZnO–ZnS nanocomposite, more than 90% of RhB dye are removed under the simulated sunlight 38 . In our previously reported work, we synthesized ZnO photocatalyst for photocatalytic degradation of MB, CIP on solar simulator light exposure and found that ZnO catalyst exhibited the advanced dye degradation efficiency 83%, 60% respectively after 45 min 27 , 28 .…”

Section: Introductionmentioning

confidence: 94%

“…Because of its photostability, low operating temperature, high chemical stability, water insolubility, and non-toxicity, ZnO has been found to be the most efficient photocatalytic activity. Thus, it is frequently used for such purposes as mentioned in our previous publications 27 , 28 . However, due to its wide band gap (3.2 eV), it does not work when exposed to visible light.…”

Section: Introductionmentioning

confidence: 99%

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Copper sulfide and zinc oxide hybrid nanocomposite for wastewater decontamination of pharmaceuticals and pesticides

Mohammed

Ali

Gomaa

et al. 2022

Sci Rep

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In this work, hybrid nanocomposites of CuS QDs @ ZnO photocatalysts are fabricated through a facile microwave-assisted (MW) hydrothermal method as a green preparation process. The prepared photocatalysts (PCs) are employed under simulated sunlight (SL) for the degradation of ciprofloxacin, ceftriaxone, ibuprofen pharmaceuticals, methylene blue dye, and 2,4,5-trichlorophenoxyacetic acid (2,4-D) pesticide. The prepared photocatalysts are characterized in detail using several compositional, optical, and morphological techniques. The influence of the CuS (QDs) wt. % on morphological, structural, as well as photocatalytic degradation efficiency have been investigated. The small displacement between the (107) plane of CuS and the (102) plane of ZnO can confirmed the existence of lattice interaction, implying the formation of p-n heterojunctions. TEM and XRD results demonstrated that the CuS QDs are established and uniformly decorated on the surface of ZnO NRs, confirming the forming of an efficient CuS QDs @ ZnO heterojunction nanostructures. The CuS QDs @ ZnO hybrid nanocomposites showed enhancement in crystallinity, light absorption, surface area, separation of e–h pair and inhibition in their recombination at an interfacial heterojunction. In addition it is found that, 3 wt% CuS QDs @ ZnO has the foremost influence. The results showed improvement of photocatalytic activity of the 3% CuS QDs @ ZnO hybrid nanocomposite as compared to the bare ZnO nanorods. The impressive photocatalytic performance of CuS @ ZnO heterostructure nanorods may be attributed to efficient charge transfer. The prepared CuS QDs @ ZnO hybrid nanocomposites exhibited 100% removal for MB dye, after 45 min, and after 60 min for ibuprofen, ciprofloxacin pharmaceuticals, and 2.4.5 trichloro phenoxy acetic acid pesticide with the catalyst amount of 0.2 g/L. Although 100% removal of ceftriaxone pharmaceutical acheived after 90 min. In addition CuS QDs @ ZnO hybrid nanocomposites exhibited complete removal of COD for ibuprofen, ceftriaxone pharmaceuticals and 2.4.5 trichloro phenoxy acetic acid pesticide after 2 h with no selectivity. Briefly, 3% CuS QDs@ZnO hybrid nanocomposites can be considered as promising photoactive materials under simulated sunlight for wastewater decontamination.

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“…By modifying the surface, QDs are made available for interacting efficiently and effectively with targeted analytes for a wide range of applications including dye-sensitized solar cells (DSSCs), 13–16 drug delivery for various medical purposes, 17,18 biological and biomedical applications, 19–21 biosensors, 22–24 cosmetics, 25 LEDs, 26 UV radiation absorbers 27 and as photocatalysts in the degradation of various organic dyes. 28–31 QDs have proved to be an efficient electron and energy acceptor due to their broad absorption cross-sectional area. 32 The prime purpose of the current study is to explore how different capping ligands affect the compatibility of ZnO QDs as an efficient acceptor in collaboration with PBSA as the electron donor.…”

Section: Introductionmentioning

confidence: 99%