An experimental and theoretical study of the effect of Ce doping in ZnO/CNT composite thin film with enhanced visible light photo-catalysis

Elias, Md.; Uddin, Md. Nizam; Hossain, Md. Asjad; Saha, Joyanta K.; Siddiquey, Iqbal Ahmed; Sarker, Dali Rani; Diba, Zidnia Rahman; Uddin, Jamal; Choudhury, Mahed-Ul-Islam; Firoz, Shakhawat H.

doi:10.1016/j.ijhydene.2019.06.056

Cited by 34 publications

(16 citation statements)

References 58 publications

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“…N-doped ZnO/CNT thin film was fabricated by applying sol-gel drop coating protocol according to the literature with some modifications [ 57 ]. Typically, to prepare the N-doped ZnO/CNT, 0.7316 g of zinc acetate dihydrate and 0.4 mL of tri-ethylamine were first dissolved in 9.6 mL of anhydrous ethanol under stirring environment (300 rpm) for 4–5 min, followed by the addition of 5wt% of nitrogen (urea) (28 mg urea) and 5wt% of CNTs (5 mg) to the above solution.…”

Section: Methodsmentioning

confidence: 99%

A Highly Efficient and Stable Photocatalyst; N-Doped ZnO/CNT Composite Thin Film Synthesized via Simple Sol-Gel Drop Coating Method

et al. 2021

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The thin film of N-doped ZnO/CNT nanocomposite was successfully fabricated on soda lime glass substrate by a simple sol-gel drop-coating method. The structural, morphological, chemical, and optical properties of as prepared samples were characterized by a variety of tools such as X-ray Diffraction (XRD), Field Emission Scanning Electron Microscopy (FE-SEM), Fourier Transform Infrared spectroscopy (FT-IR), and UV-visible spectroscopy. The hexagonal crystalline structure was confirmed from XRD measurement without any other impurity phase detection in samples. The N-doped ZnO/CNT composite showed excellent photo-catalytic activity towards cationic methylene blue (MB) dye degradation with 100% removal rate under UV light irradiation as compared to N-doped ZnO (65%) and pure ZnO (47.36%). The convincing performance has also been observed for the case of visible light irradiation. The enhancement of that photocatalytic activity might be due to narrowing the band gap as well as the reduction of electron–hole pair recombination in ZnO matrix with the incorporation of dopant nitrogen and CNT. It is assumed from the obtained results that N-doped ZnO/CNT nanocomposite thin film can be employed as an economically achievable and ecofriendly method to degrade dye with UV and visible light irradiation. Additionally, density functional theory (DFT) calculations were applied to explore the effect of N-doping on electronic structure of ZnO. The computational study has supported the experimental results of significant band gap contraction, which leads to the maximum absorption towards higher wavelength and no appreciable change of lattice parameters after doping. A conceivable photocatalytic mechanism of N-doped ZnO/CNT nanocomposite has been proposed as well.

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Section: Methodsmentioning

confidence: 99%

A Highly Efficient and Stable Photocatalyst; N-Doped ZnO/CNT Composite Thin Film Synthesized via Simple Sol-Gel Drop Coating Method

et al. 2021

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“…Similarly, the REE doped ZnO nanomaterials can effectively regulate the morphology and electronic structure of ZnO. Replacing the Zn 2+ in the lattice could cause the lattice distortion, and increase the defect energy level [61a,b,c,d] …”

Section: Metal Element Dopingmentioning

confidence: 99%

Advances in Doped ZnO Nanostructures for Gas Sensor

Wang

Gong

et al. 2020

The Chemical Record

120

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Gas sensors based on metal oxides semiconductor (MOS) have attracted extensive attention from both academic and industry. ZnO, as a typical MOS, exhibits potential applications in toxic gas detection, owning to its wide band gap, n-type transport characteristic and excellent electrical performance. Meanwhile, doping is an effective way to improve the sensing performance of ZnO materials. In this review, the effects of different types of doping on morphology, crystal structure, band gap and depletion layer of ZnO materials are comprehensively discussed. Theoretical analysis on the strategies for enhancing the sensing properties of ZnO is also provided. This review puts forward the reasonable insight for designing efficient n-type ZnO-based semiconductor oxide sensing materials.

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“…After the incorporation of Al, the particle size becomes more uniform, and the distribution of size is between 15 and 30 nm [49]. Another example is Ce-doped ZnO/carbon nanotube (CNT) thin film, which was prepared using a sol-gel drop coating method [50]. TEA and zinc acetate dehydrate were added into anhydrous ethanol under vigorous stirring.…”

Section: Thin-film Catalystsmentioning

confidence: 99%

“…To evaluate the crystallinity and crystal phases of the prepared thin film, XRD and FESEM spectra were acquired and are displayed in Figure 16(b) [50]. Ce and CeO 2 ,Ce 2 O 3 or other crystalline forms were not identified in the patterns, so the authors believed that Ce ions were uniformly substituted by Zn sites or interstitial sites in ZnO crystals.…”

Section: Thin-film Catalystsmentioning

confidence: 99%

“…From the FESEM spectra of Ce-doped ZnO/CNT thin film, it is observed that that the sample ZnO/CNT is ZnO decorated on the surface of CNT, and the Ce-doped ZnO sample presents 3D flower-like microstructures consisting of many nanoflakes. It is worth noting that many different-size pores were generated in the 3D microstructures, which might act as transport paths for molecules and active sites for catalytic reaction and improve the catalytic properties of the thin-film material [50]. [49,50].…”

Section: Thin-film Catalystsmentioning

confidence: 99%

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Heterogeneous Catalytic Process for Wastewater Treatment

Zhang¹

2020

Advanced Oxidation Processes - Applications, Trends, and Prospects

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This chapter introduced heterogeneous catalysis and described diverse heterogeneous catalytic processes for wastewater treatment. The main advantages of heterogeneous catalysis were explained compared with homogeneous catalysis. The methods of synthesis and characterization of heterogeneous catalysts with some examples were then elaborated. The principle of heterogeneous catalytic treatment process of refractory wastewater was analyzed, and several different types of heterogeneous catalytic oxidation processes, technical progresses, and application examples were presented. The mechanisms of heterogeneous catalytic oxidation degradation of pollutants in wastewater were also discussed. According to the review, the heterogeneous catalytic oxidation technology was considered having a good application prospect, and the further research directions of heterogeneous catalysis were proposed.

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An experimental and theoretical study of the effect of Ce doping in ZnO/CNT composite thin film with enhanced visible light photo-catalysis

Cited by 34 publications

References 58 publications

A Highly Efficient and Stable Photocatalyst; N-Doped ZnO/CNT Composite Thin Film Synthesized via Simple Sol-Gel Drop Coating Method

A Highly Efficient and Stable Photocatalyst; N-Doped ZnO/CNT Composite Thin Film Synthesized via Simple Sol-Gel Drop Coating Method

Advances in Doped ZnO Nanostructures for Gas Sensor

Heterogeneous Catalytic Process for Wastewater Treatment

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