Biological mediated synthesis of RGO-ZnO composites with enhanced photocatalytic and antibacterial activity

Dhandapani, Perumal; AlSalhi, Mohamad S.; Karthick, R.; Chen, Fuming; Devanesan, Sandhanasamy; Kim, Woong; Rajasekar, Aruliah; Ahmed, Mukhtar; Aljaafreh, Mamduh J.; Atif, Muhammad

doi:10.1016/j.jhazmat.2020.124661

Cited by 44 publications

(13 citation statements)

References 38 publications

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“…Figure 1c shows the diffraction pattern of the GO with its characteristic (002) peak identified at 2θ = 12.5 • . In Figure 1b, a diffraction peak associated with reduced graphene oxide was observed at 24 • , which further confirmed the reduction of GO [34]. No characteristic peaks of other samples were observed, which means there were no impurities.…”

Section: Xrd Analysissupporting

confidence: 63%

Ce2O3/BiVO4 Embedded in rGO as Photocatalyst for the Degradation of Methyl Orange under Visible Light Irradiation

Onwudiwe

Phadi

Oyewo

2021

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A p–n heterojunction semiconductor structure composed of Ce3O4 and BiVO4 has been synthesized and then incorporated into reduced graphene oxide (rGO) by the hydrothermal method. The ternary composites were characterized by X-ray diffraction, transmission electron microscopy (TEM), scanning electron microscopy (SEM), electron diffraction spectroscopy (EDS), and UV–vis spectroscopy. The efficiency of the composites as photocatalysts was determined by studying the oxidative degradation of methyl orange in aqueous solution under visible light irradiation. The effect of parameters such as pH, catalyst loading, and concentration of the dye solution was examined in order to determine their influence on the photocatalytic activity of the composites. The composite incorporated into reduced graphene oxide presented the highest percentage (above 90%) in 2 h time, attributed to the effect of the increased surface area. The process of the enhanced photocatalytic activity has been discussed based on the energy band positions of the nanoparticles within the composite.

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Section: Xrd Analysissupporting

confidence: 63%

Ce2O3/BiVO4 Embedded in rGO as Photocatalyst for the Degradation of Methyl Orange under Visible Light Irradiation

Onwudiwe

Phadi

Oyewo

2021

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“…Moreover, Mo-doped ZnO NPs were strongly anchored on RGO sheets and act as spacers to avoid restacking of RGO sheets and increase the surface area. The lower particle size and the higher surface area of NPs/NCs are associated with increased biological activity. , Figure D–F shows the high-resolution TEM images of ZnO NPs, Mo-ZnO NPs, and Mo-ZnO/RGO NCs, respectively. These pictures depict that particles were highly crystalline and confirm the synergism of ZnO, Mo, and RGO with good-quality lattice fringes without defects, which is important in composite materials for potential biomedical applications.…”

Section: Results and Discussionmentioning

confidence: 99%

Enhanced Anticancer Performance of Eco-Friendly-Prepared Mo-ZnO/RGO Nanocomposites: Role of Oxidative Stress and Apoptosis

et al. 2022

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ZnO nanoparticles (NPs) have attracted great attention in cancer therapy because of their novel and tailorable physicochemical features. Pure ZnO NPs, molybdenum (Mo)-doped ZnO NPs, and Mo-ZnO/reduced graphene oxide nanocomposites (Mo-ZnO/RGO NCs) were prepared using a facile, inexpensive, and eco-friendly approach using date palm ( Phoenix dactylifera L.) fruit extract. Anticancer efficacy of green synthesized NPs/NCs was examined in two different cancer cells. The potential mechanism of the anticancer activity of green synthesized NPs/NCs was explored through oxidative stress and apoptosis. The syntheses of pure ZnO NPs, Mo-ZnO NPs, and Mo-ZnO/RGO NCs were confirmed by X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), and photoluminescence (PL). Dynamic light scattering (DLS) study indicated the excellent colloidal stability of green prepared samples. Mo-ZnO/RGO NCs exhibited threefold higher anticancer activity in human colon (HCT116) and breast (MCF7) cancer cells as compared to pure ZnO NPs. The anticancer activity of Mo-ZnO/RGO NCs was mediated through reactive oxygen species, p53, and the caspase-3 pathway. Moreover, cytocompatibility of Mo-ZnO/RGO NCs in human normal colon epithelial (NCM460) and normal breast epithelial cells (MCF10A) was much better than those of pure ZnO NPs. Altogether, green stabilized Mo-ZnO/RGO NCs exhibited enhanced anticancer performance and improved cytocompatibility because of green mediated good synergism between ZnO, Mo, and RGO. This study suggested the high nutritional value fruit-based facile preparation of ZnO-based nanocomposites for cancer therapy.

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“…As illustrated in Figure , the high-resolution XPS spectra of (a) C 1s, (b) O 1s, (c) Zn 2p, (d) N 1s, and (e) S 2p proved the coexistence of C, N, O, S, and Zn elements in the hollow cactus-like ZnO/ANS-rGO. The C 1s spectrum could be decomposed into four independent spectra (Figure a), positioned at 284.55, 285.20, 286.22, and 288.79 eV which were ascribed to C in C–C/CC, C–N, C–O, and OC, respectively. − Figure b shows the deconvoluted O 1s spectrum, and three kinds of binding states (530.29, 531.78 eV and 532.42 eV) were obtained. The peak at about 530.29 eV is attributed to the lattice oxygen (O lat ) of ZnO, while the peak at about 531.78 eV is associated with the surface-adsorbed oxygen (O ads ) of hollow cactus-like ZnO/ANS-rGO nanocomposites. , The peak at 532.42 eV corresponded to C–O–Zn formed based on the coordination interaction between ZnO and GO. , The Zn 2p spectrum of hollow cactus-like ZnO/ANS-rGO shows two major peaks in 1021.43 and 1044.53 eV, which are ascribed to the doublet Zn 2p 2/3 and 2p 1/2 of Zn 2+ , respectively (Figure c) .…”

Section: Resultsmentioning

confidence: 99%

Assembling Hollow Cactus-Like ZnO Nanorods with Dipole-Modified Graphene Nanosheets for Practical Room-Temperature Formaldehyde Sensing

Liang

Fan

et al. 2022

ACS Appl. Mater. Interfaces

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Formaldehyde (HCHO) sensing plays a critical role for indoor environment monitoring in smart home systems. Inspired by the unique hierarchical structure of cactus, we have prepared a ZnO/ANS-rGO composite for room-temperature (RT) HCHO sensing, through assembling hollow cactus-like ZnO nanorods with 5-aminonaphthalene-1-sulfonic acid (ANS)-modified graphene nanosheets in a facile and template-free manner. Interestingly, it was found that the ZnO morphology could be simply tuned from flower clusters to hollow cactus-like nanostructures, along with the increase of the reaction time during the assembly process. The ZnO/ANS-rGO-based sensors exhibited superior RT HCHO-sensing performance with an ultrahigh response (68%, 5 ppm), good repeatability, long-term stability, and an outstanding practical limit of detection (LOD: 0.25 ppm) toward HCHO, which is the lowest practical LOD reported so far. Furthermore, for the first time, a 30 m3 simulation test cabinet was adapted to evaluate the practical gas-sensing performance in an indoor environment. As a result, an instantaneous response of 5% to 0.4 ppm HCHO was successfully achieved in the simulation test. The corresponding sensing mechanism was interpreted from two aspects including high charge transport capability of ANS-rGO and the distinct gas adsorbability derived from nanostructures, respectively. The combination of a biomimetic hierarchical structure and supramolecular assembly provides a promising strategy to design HCHO-sensing materials with high practicability.

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Biological mediated synthesis of RGO-ZnO composites with enhanced photocatalytic and antibacterial activity

Cited by 44 publications

References 38 publications

Ce2O3/BiVO4 Embedded in rGO as Photocatalyst for the Degradation of Methyl Orange under Visible Light Irradiation

Ce2O3/BiVO4 Embedded in rGO as Photocatalyst for the Degradation of Methyl Orange under Visible Light Irradiation

Enhanced Anticancer Performance of Eco-Friendly-Prepared Mo-ZnO/RGO Nanocomposites: Role of Oxidative Stress and Apoptosis

Assembling Hollow Cactus-Like ZnO Nanorods with Dipole-Modified Graphene Nanosheets for Practical Room-Temperature Formaldehyde Sensing

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