Well-designed Ag/ZnO/3D graphene structure for dye removal: Adsorption, photocatalysis and physical separation capabilities

Kheirabadi, M ; Sharif University of Technology | 2019

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  1. Type of Document: Article
  2. DOI: 10.1016/j.jcis.2018.10.102
  3. Publisher: Academic Press Inc , 2019
  4. Abstract:
  5. In this research, adsorption and photocatalytic degradation process were utilized to remove organic dye from wastewater. To accomplish that, a newly-designed ternary nanostructure based on Ag nanoparticles/ZnO nanorods/three-dimensional graphene network (Ag NPs/ZnO NRs/3DG) was prepared using a combined hydrothermal-photodeposition method. The three-dimensional structure of graphene hydrogel as a support for growth of ZnO nanorods was characterized using field emission scanning electron microscopy (FESEM). In addition, diameter of silver nanoparticles grown on the ZnO nanorods with the average aspect ratio of 5 was determined in the range of 30–80 nm by using transmission electron microscopy (TEM). The X-ray diffraction (XRD) pattern was revealed hexagonal Wurtzite structure of ZnO nanorods and the (1 1 1) lattice plane of the face-centered cubic (FCC) of the silver nanoparticles. The dye adsorption capacity of the synthesized 3DG was evaluated at about 300 mg/g using kinetic study. The photocatalytic dye degradation under both UV and visible light irradiation exhibited an enhanced activity of the prepared ternary Ag/ZnO/3DG sample in comparison to ZnO/3DG and 3DG structures. Different charge-carrier scavengers were utilized to elucidate the synergistic effect of adsorption and visible-light photocatalytic degradation mechanism for dye removal. The facile photocatalyst recovery as well as the high elimination rate of dye is promising for future applications such as efficient removal of organic contaminants from industrial wastewater under solar irradiation. © 2018 Elsevier Inc
  6. Keywords:
  7. Organic adsorption capacity ; Three dimensional graphene ; Visible active photocatalyst ; ZnO nanorods ; Adsorption ; Aspect ratio ; Degradation ; Field emission microscopes ; High resolution transmission electron microscopy ; II-VI semiconductors ; Irradiation ; Light ; Metal nanoparticles ; Nanorods ; Photodegradation ; Scanning electron microscopy ; Zinc oxide ; Zinc sulfide ; Field emission scanning electron microscopy ; Hexagonal wurtzite structure ; Organic adsorption ; Photocatalytic degradation mechanism ; Photocatalytic dye degradations ; Three-dimensional graphene ; Visible active photocatalysts ; ZnO nanorod ; Silver nanoparticles ; Graphene ; Nanorod ; Silver nanoparticle ; Zinc oxide nanoparticle ; Desorption ; Hydrogel ; Molecular weight ; Oxidation ; Photocatalysis ; Priority journal ; Static electricity ; Transmission electron microscopy ; Ultraviolet radiation ; X ray diffraction
  8. Source: Journal of Colloid and Interface Science ; Volume 537 , 2019 , Pages 66-78 ; 00219797 (ISSN)
  9. URL: https://www.sciencedirect.com/science/article/abs/pii/S0021979718312992?via%3Dihub