Journal
RESEARCH ON CHEMICAL INTERMEDIATES
Volume 42, Issue 5, Pages 4697-4714Publisher
SPRINGER
DOI: 10.1007/s11164-015-2309-6
Keywords
ZnO nanorods; Reduced graphene oxide; Photoreduction; Porphyrin; Photocatalytic process
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Funding
- Chemistry Department, Iran University of Science and Technology
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In this paper, ZnO nanorods were synthesized after optimizing the parameters of pH and the concentration of raw materials, reflux temperature, reflux time and annealing temperature through the co-precipitation method. The resulting nanorods with 90 nm average diameters have a wurtzite hexagonal crystalline structure. To improve the photocatalytic efficiency of the prepared photocatalyst in the visible light region, ZnO nanorods were functionalized with a tin porphyrin (SnTCPP) photosensitizer. The prepared photocatalysts were characterized through FT-IR, DRS, XRD and SEM analysis. The photoactivity of the prepared samples was investigated via photodegradation of a colored pollutant of methyl orange and photoreduction of graphene oxide. The results showed that ZnO photosensitized with SnTCPP is able to destroy 85 % of methyl orange in 240 min under visible light radiation. The investigation of the photocatalytic mechanism determined that is the major species in the photodegradation of methyl orange over the SnTCPP/ZnO compound. In addition, the photoreduction process was suitably carried out using SnTCPP/ZnO compound. The reduced graphene oxide was obtained during 2 h of the photoreduction process over the prepared SnTCPP/ZnO compound. Thus, porphyrin photosensitizer can be very helpful in activating the ZnO photocatalyst in the visible region.
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