2D-3D graphene-coated diatomite as a support toward growing ZnO for advanced photocatalytic degradation of methylene blue.
Xingjian DaiHao ZengChuan JinJinsong RaoXiaoying LiuKailin LiYifan ZhangYaolun YuYu Xin ZhangPublished in: RSC advances (2021)
In this work, a diatomite@graphene@ZnO (ZGD) photocatalyst was synthesized by chemical vapor deposition and hydrothermal methods and used for the photocatalytic degradation of methylene blue. The characterization of the prepared nanocomposite was performed by scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FTIR), Raman spectroscopy, X-ray diffraction (XRD), and N 2 adsorption-desorption techniques. Ultraviolet-visible diffuse reflectance spectroscopy (DRS) showed that the prepared ZGD photocatalyst enhanced the absorption of visible light and induced a red-shift. Photoluminescence spectroscopy (PL) revealed that the recombination of electron and hole pairs can be effectively suppressed. Besides, the synergistic effect of diatomite and graphene avoids the agglomeration of ZnO, increases the number of surface adsorption sites, and limits the electron transport, consequently improving the photocatalytic activity of ZnO. When ZGD-3 was UV-irradiated ( λ = 663 nm) for 90 minutes, the degradation effectiveness of methylene blue (MB) was 100%. After the fifth repetition, the photocatalytic degradation efficiency was always greater than 95%. Simply put, the ZGD nanocatalyst can be used as an efficient photocatalyst for dye wastewater treatment.
Keyphrases
- visible light
- electron microscopy
- high resolution
- wastewater treatment
- single molecule
- raman spectroscopy
- solid state
- room temperature
- aqueous solution
- randomized controlled trial
- antibiotic resistance genes
- quantum dots
- dna damage
- carbon nanotubes
- walled carbon nanotubes
- dna repair
- low grade
- single cell
- drug delivery
- photodynamic therapy
- ionic liquid
- high glucose
- light emitting
- gold nanoparticles
- risk assessment
- high grade
- highly efficient
- endothelial cells
- stress induced
- heavy metals