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High Temperature Material Processes: An International Quarterly of High-Technology Plasma Processes
SJR: 0.19 SNIP: 0.341 CiteScore™: 0.43

ISSN Print: 1093-3611
ISSN Online: 1940-4360

High Temperature Material Processes: An International Quarterly of High-Technology Plasma Processes

DOI: 10.1615/HighTempMatProc.2017024734
pages 127-142

EFFECT OF DIELECTRIC BARRIER DISCHARGE PLASMA TREATMENT ON THE PHOTOLUMINESCENCE AND PHOTOCATALYTIC PROPERTIES OF ZnO POWDER

Natalie A. Savastenko
Belorussian State University, International Sakharov Environmental Institute BSU, 23 Dolgobrodskaya Str., Minsk, 220070, Belarus
I. I. Filatova
B. I. Stepanov Institute of Physics, National Academy of Sciences of Belarus, 68 Nezavisimost Ave., Minsk, 220072, Belarus
Veronika A. Lyushkevich
B. I. Stepanov Institute of Physics, National Academy of Sciences of Belarus, 68 Nezavisimost Ave., Minsk, 220072, Belarus
N. I. Chubrik
B. I. Stepanov Institute of Physics, National Academy of Sciences of Belarus, 68 Nezavisimost Ave., Minsk, 220072, Belarus
S.V. Goncharik
B. I. Stepanov Institute of Physics, National Academy of Sciences of Belarus, 68 Nezavisimost Ave., Minsk, 220072, Belarus
S. A. Maskevich
Belorussian State University, International Sakharov Environmental Institute BSU, 23 Dolgobrodskaya Str., Minsk, 220070, Belarus

ABSTRACT

A dielectric barrier discharge (DBD) plasma was applied to treat commercially available ZnO powders. The performance of untreated and plasma-treated ZnO photocatalysts is discussed in the light of their application for photodegradation of organic pollutants. The photocatalytic activities of plasma-treated and untreated ZnO powders were evaluated by measuring the photodegradation of methyl orange (MO) in aqueous solution exposed to ultraviolet (UV) light. The MO concentration in solution was measured spectrophotometrically (UV-Vis spectrophotometry). The photocatalytic activity, expressed in terms of the methyl orange photodegradation rate, was 2.2 times higher for the plasma-treated sample than for the untreated one. In addition, the kinetic process of photocatalytic degradation of MO was also examined, and the degradation of MO was found to follow a first-order rate law. The results imply that different mechanisms are involved in the decomposition of methyl orange on untreated and plasmatreated catalysts. The samples were also characterized by photoluminescence (PL) spectroscopy. Room temperature PL spectra of ZnO powders displayed two emission bands: excitonic UV emission, and deep level visible emission. Characterization of the ZnO powders by means of photoluminescence indicated that plasma treatment leads to an increase in the UV excitonic emission. The increasing photocatalytic activity after plasma treatment can be attributed to the increased optical quality of ZnO.


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