ZnS:Mn²⁺ Quantum Dots as Efficient Photocatalyst for Organic Dye Decolorization

Abstract:

Fluorescent zinc blende structured pure and Mn²⁺ doped ZnS quantum dots were prepared by simple aqueous based technique at room temperature. Under UV-excitation the quantum dots show photoluminescence bands at 2.1 and 3.0 eV corresponded to Mn²⁺ and ZnS intrinsic defect emission, respectively. The photocatalytic activity was tested for the photodegradation of methylene blue in aqueous solution. The influence of the Mn²⁺ concentration on the dye decolorization efficiency was studied. The highest photocatalytic degradation rate of methylene blue was obtained for ZnS quantum dots in glutathione shell doped with 0.5 at.% of Mn²⁺. The mechanisms of photoluminescence and photocatalytic activity were discussed.

• Periodical: Defect and Diffusion Forum (Volume 386)
• Pages: 207-213
• DOI: https://doi.org/10.4028/www.scientific.net/DDF.386.207
• Online since: September 2018
• Authors: Ksenia A. Sergeeva*, Alexander A. Sergeev, Yulia V. Kuznetsova, Sergey S. Voznesenskiy
• Keywords: Charge Transfer, Methylene Blue, Photocatalysis, Quantum Dot, Zinc Sulfide

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