Facile Preparation of ZnO/CNTs Nanocomposites via ALD for Photocatalysis Applications
authors Oliveira, IE; Silva, RM; Girao, AV; Faria, JL; Silva, CG; Silva, RF
nationality International
journal EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
author keywords Atomic layer deposition; Carbon nanotubes; Chemical vapor deposition; Photocatalysis; Zinc oxide
keywords ATOMIC LAYER DEPOSITION; CARBON NANOTUBES; GROWTH-MECHANISM; DEGRADATION; COMPOSITES; PHENOL; ZNO; PHOTODEGRADATION
abstract Vertically aligned carbon nanotubes (VA-CNTs) of 2.3 mu m in height were produced by thermal chemical vapor deposition (TCVD) on Si/SiO2 substrates. These carbon arrays were coated with zinc oxide (ZnO) via atomic layer deposition (ALD) technique. Conformal, uniform and very thin films (max. 26 nm) around the CNTs were obtained after 200 ALD cycles. The photocatalytic performance of these nanocomposite materials was tested in the degradation of rhodamine B, a harmful dye present in food and textile wastewaters. The optimal degradation performance is already obtained after 100 ALD cycles on VA-CNTs, which provide 77 % of RhB degradation after 420 min of irradiation. The photocatalytic results suggested a remarkable synergistic effect between the CNT and ZnO phases. The stability of ZnO/CNTs nanocomposites after being used as photocatalysts was demonstrated by Raman spectroscopy, as the CNTs structure stayed intact and the ZnO remained coupled to the CNTs. Thus, a main advantage of the present approach is the immobilization of the photocatalyst material on a solid support, avoiding further complex nanomaterial separation from the treated water stream.
publisher WILEY-V C H VERLAG GMBH
issn 1434-1948
isbn 1099-0682
year published 2020
volume 2020
issue 18
beginning page 1743
ending page 1750
digital object identifier (doi) 10.1002/ejic.202000032
web of science category Chemistry, Inorganic & Nuclear
subject category Chemistry
unique article identifier WOS:000530087700001
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journal impact factor 2.529
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