Photo-catalytic Degradation of Methylene Blue Dye in Water Over Mn-N co-doped ZnS Nanoparticles

Author(s): Dagme Zewde , Om Parkash Yadav* , Abi M. Taddesse .

Journal Name: Current Physical Chemistry

Volume 7 , Issue 2 , 2017

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Abstract:

Objective: The reported work was aimed to remove methylene blue dye, a toxic chemical, from its aqueous solution by photo-catalytic degradation technique and to observe the effect of doping Mn and N on photo-catalytic activity of ZnS.

Method: Nanosize ZnS, Mn-doped-ZnS, N-doped-ZnS and Mn-N co-doped ZnS were prepared by chemical co-precipitation method and characterized these using XRD, TEM and UV–visible spectroscopic techniques. Activity of as-synthesized photo-catalysts under UV and visible radiations were compared using degradation of methylene blue dye, as a probe.

Results: The average crystallite size of above photo-catalysts, from XRD analysis, were: 7.8, 7.5, 6.6 and 6.6 nm, respectively. Doping of N in ZnS caused a red shift of photo-absorption resulting in the decrease of band gap of ZnS. Co-doping of Mn and N in ZnS showed synergistic effect in enhancing oxidative degradation of the dye. The observed maximum degradation of 10 mg L-1 methylene blue at 3 hrs over Mn-N co-doped ZnS, separately, under UV and Visible radiations were: 55.6 % and 70.8%, respectively.

Conclusion: Doping of Mn and N into ZnS exhibit synergism in increasing photo-catalytic activity of ZnS. The photo-catalytic degradation of methylene blue follows a pseudo first order kinetic under UV as well as visible radiation.

Keywords: Degradation, nanosize, photo-catalysts, spectroscopic, XRD, methylene blue.

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Article Details

VOLUME: 7
ISSUE: 2
Year: 2017
Page: [172 - 180]
Pages: 9
DOI: 10.2174/1877946807666170213144230
Price: $58

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