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Drinking Water Engineering and Science An interactive open-access journal

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https://doi.org/10.5194/dwes-2017-20
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.
Research article
02 Jun 2017
Review status
This discussion paper is under review for the journal Drinking Water Engineering and Science (DWES).
Photocatalytic degradation of Dyes in Water by Analytical Reagent Grade Photocatalysts – A comparative study
Dnyaneshwar R. Shinde, Popat S. Tambade, Manohar G. Chaskar, and Kisan M. Gadave Prof. Ramkrishna More Arts, Commerce and Science College, Akurdi, Pune - 44, Affiliated Savitribai Phule Pune University, India
Abstract. In a search of low cost photocatalyst for dye degradation we have evaluated photocatalytic activity of the Analytical Reagent (AR) grade ZnO, TiO2 and SnO2. The photocatalytic activity was evaluated towards the decolourization of structurally diverse dyes such as crystal violet, basic blue and methyl red under solar irradiation and compared with benchmark Degussa P-25 (TiO2) photocatalyst. The received metal oxides were characterized by the different physicochemical methods of analysis. Powder XRD analysis showed that these metal oxides are polycrystalline in nature and crystallized in different crystalline phases. The crystalline phases of these oxides were found to be hexagonal for ZnO, tetragonal for TiO2 and rutile for SnO2. Particle morphology was analysed through SEM imaging and it showed that these oxides consists of different particle morphologies and have different particle sizes. Band gap was evaluated from diffuse reflectance spectra and it was found to be 3.24, 3.20 and 3.66 eV respectively for ZnO, TiO2 and SnO2. Among the three AR grade oxides, ZnO exhibited highest photocatalytic activity which is even higher than Degussa P-25 (TiO2) photocatalyst. About 20 % enhancement in the photocatalytic activity of AR grade ZnO was observed when silver metal loaded of on ZnO surface.

Citation: Shinde, D. R., Tambade, P. S., Chaskar, M. G., and Gadave, K. M.: Photocatalytic degradation of Dyes in Water by Analytical Reagent Grade Photocatalysts – A comparative study, Drink. Water Eng. Sci. Discuss., https://doi.org/10.5194/dwes-2017-20, in review, 2017.
Dnyaneshwar R. Shinde et al.
Dnyaneshwar R. Shinde et al.
Dnyaneshwar R. Shinde et al.

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Short summary
Photocatalytic activity of commercially available photocatalysts viz. ZnO, TiO2, and SnO2, a set of photocatalytic experiments were performed under similar conditions using Crystal Violet, Basic Blue and Methyl Red dyes in water. The comparison of photocatalytic activity of ZnO with the benchmark Degussa P-25 (TiO2) catalyst as well as with AR grade TiO2 and SnO2 showed that despite of low specific surface area and larger grain size, ZnO displayed higher activity towards the degradation of dyes.
Photocatalytic activity of commercially available photocatalysts viz. ZnO, TiO2, and SnO2, a set...
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