Ag/ZnO/graphene oxide heterostructure for the removal of rhodamine B by the synergistic adsorption–degradation effects

Qin, Jieling; Li, Rong; Lu, Chunyu; Jiang, Yan; Tang, Hua; Yang, Xiaofei

doi:10.1016/j.ceramint.2014.11.046

Cited by 43 publications

(15 citation statements)

References 44 publications

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“…These peaks are compatible with the standard XRD data for the hexagonal Zn lattice (JCPDS file 04-0831) ( Figure 6) [43]. The characteristic peaks of ZnO at 32 • and 34.7 • are assigned to (100) and (002) facets [44,45]. The XPS spectrum of wide scan demonstrates that the binding energy of 284.5, 532.7 and 1023.6 are attributed to C1s, O1s and Zn 2p, respectively.…”

Section: Characterization Of the Commercially Available Nzvzsupporting

confidence: 67%

Modeling of Malachite Green Removal from Aqueous Solutions by Nanoscale Zerovalent Zinc Using Artificial Neural Network

Ruan

Shi

et al. 2017

Applied Sciences

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Abstract:The commercially available nanoscale zerovalent zinc (nZVZ) was used as an adsorbent for the removal of malachite green (MG) from aqueous solutions. This material was characterized by X-ray diffraction and X-ray photoelectron spectroscopy. The advanced experimental design tools were adopted to study the effect of process parameters (viz. initial pH, temperature, contact time and initial concentration) and to reduce number of trials and cost. Response surface methodology and rapidly developing artificial intelligence technologies, i.e., artificial neural network coupled with particle swarm optimization (ANN-PSO) and artificial neural network coupled with genetic algorithm (ANN-GA) were employed for predicting the optimum process variables and obtaining the maximum removal efficiency of MG. The results showed that the removal efficiency predicted by ANN-GA (94.12%) was compatible with the experimental value (90.72%). Furthermore, the Langmuir isotherm was found to be the best model to describe the adsorption of MG onto nZVZ, while the maximum adsorption capacity was calculated to be 1000.00 mg/g. The kinetics for adsorption of MG onto nZVZ was found to follow the pseudo-second-order kinetic model. Thermodynamic parameters (∆G 0 , ∆H 0 and ∆S 0 ) were calculated from the Van't Hoff plot of lnKc vs. 1/T in order to discuss the removal mechanism of MG.

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Section: Characterization Of the Commercially Available Nzvzsupporting

confidence: 67%

Modeling of Malachite Green Removal from Aqueous Solutions by Nanoscale Zerovalent Zinc Using Artificial Neural Network

Ruan

Shi

et al. 2017

Applied Sciences

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“…Compared with GO, it is obvious that two diffraction peaks of GO disappear after combining with Cu or Fe and ZnO nanoparticles, which may be attributed to the low amount and relatively low diffraction intensity of GO . That the regular stack of GO sheets is destroyed due to the insertion of nanoparticles may be another reason . And this could also suggest the good dispersion of GO nanosheets in the prepared materials.…”

Section: Resultsmentioning

confidence: 99%

“…On the other hand, GO has superior electrical conductivity, mechanical properties, and effective surface area. The addition of GO into a catalyst can improve its specific surface area and surface electron transport capacity, thus reducing the recombination of photo‐generated charge carriers, and then efficiently increasing the light‐harvesting ability and dye adsorption …”

Section: Resultsmentioning

confidence: 99%

“…Ba‐Abbad et al found that Fe‐doped ZnO nanoparticles show a smaller crystal size and lower band gap as well as better absorption in the visible light region in comparison with the un‐doped ZnO. Besides, several studies have shown that anchoring doped ZnO onto graphene oxide (GO) could further enhance the photocatalytic performance due to the unique two‐dimensional structure, large theoretical specific surface area, superior electronic properties, and unique surface structures of GO, which can effectively promote charge transportation and the separation of electron‐hole pairs, thus improving the photocatalytic activity of doped ZnO photocatalysts …”

Section: Introductionmentioning

confidence: 99%

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Enhanced visible photocatalytic activity of Fe‐Cu‐ZnO/graphene oxide photocatalysts for the degradation of organic dyes

et al. 2018

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Fe‐Cu‐ZnO/graphene oxide (Fe‐Cu‐ZnO/GO) photocatalysts are successfully prepared by the sol‐gel method and characterized by X‐ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), high resolution transmission electron microscopy (HRTEM), Fourier transform infrared spectrometry (FTIR), UV‐Vis diffuse reflectance spectra (UV‐Vis DRS), and X‐ray photoelectron spectroscopy (XPS). The results show that the Fe‐Cu‐ZnO/GO photocatalyst has the smaller average crystallite size and the narrower band gap, exhibits the stronger light absorption in the whole visible light region, and possesses better charge separation capability than that of pure ZnO, ZnO/GO, and Cu‐ZnO/GO photocatalysts. The photocatalytic activity of these catalysts is tested by degradation of dark green dye under visible light irradiation which demonstrates that Fe‐Cu‐ZnO/GO photocatalyst effectively degrades dark green dye and shows a significant photocatalytic enhancement compared to ZnO, ZnO/GO, and Cu‐ZnO/GO photocatalysts. The degradation rate of dark green dye can reach up to 99.28 %, when the initial concentration of dark green dye is 50 mg/L and the Fe‐Cu‐ZnO/GO catalyst dosage is 1 g/L with neutral pH under 90 min of visible light irradiation. In addition, Fe‐Cu‐ZnO/GO photocatalyst shows a good degradation efficiency on three other dyes. Meanwhile, the catalyst shows relatively superior reusability according to the cycling tests.

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“…The probable reason is the existence of CPAN with conjugated structure. Under visible light irradiation, CPAN can easily absorb photons to generate π → π* electron transition, leading to the enhanced absorbance of the nanocomposites . In general, the enhanced absorption of the nanocomposites in the visible range favors their visible light photocatalytic activity.…”

Section: Resultsmentioning

confidence: 99%

Enhanced visible light photocatalytic activity of zno nanoparticles modified by cyclized polyacrynitrile

Yin

Liu

et al. 2018

Env Prog and Sustain Energy

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The ZnO/cyclized polyacrylonitrile (CPAN) composites were prepared by impregnation and heat treatment process. The morphology, crystal type, internal structure of ZnO/CPAN nanocomposites were characterized by UV‐vis‐diffuse reflectance spectroscope (DRS), X‐ray diffraction, transmission electron microscopy (TEM), and X‐ray photoelectron spectroscopy (XPS). The visible light photocatalytic activity of ZnO/CPAN was evaluated by degradation of methyl orange under xenon lamp irradiation. The DRS results indicate that the absorption of ZnO/CPAN nanocomposites in the visible region was significantly higher than that of pure ZnO nanoparticles. The TEM results show that the surface of ZnO nanoparticles is occupied by the CPAN in small amount. The results of photocatalytic experiment show that the photocatalytic activity of ZnO nanoparticles can be improved significantly by the modification of CPAN. The possible photocatalytic mechanism was also discussed. © 2018 American Institute of Chemical Engineers Environ Prog, 38: 336–344, 2019

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Ag/ZnO/graphene oxide heterostructure for the removal of rhodamine B by the synergistic adsorption–degradation effects

Cited by 43 publications

References 44 publications

Modeling of Malachite Green Removal from Aqueous Solutions by Nanoscale Zerovalent Zinc Using Artificial Neural Network

Modeling of Malachite Green Removal from Aqueous Solutions by Nanoscale Zerovalent Zinc Using Artificial Neural Network

Enhanced visible photocatalytic activity of Fe‐Cu‐ZnO/graphene oxide photocatalysts for the degradation of organic dyes

Enhanced visible light photocatalytic activity of zno nanoparticles modified by cyclized polyacrynitrile

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