Photocatalytic Degradation of Rhodamine B Using MnO2 and ZnO Nanoparticles

Abstract:

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The oxide semiconductor with different band gap energy i.e. manganese dioxide (MnO2) (Eg: 1.30eV) and zinc oxide (ZnO) (Eg: 3.37 eV) nanoparticles were used to degrade RhodamineB (RhB) under irradiation of UV light (254 nm).The MnO2 nanoparticles were synthesized by hydrothermal method (160 °C, 4 h) using analytical grade manganese sulfate hydrate and potassium permanganate (VII) as precursors. The XRD analysis reveals that the nanoparticles were d-MnO2.The photocatalytic study shows that degradation of RhB solution by ZnO nanoparticles (rate constant: 0.02749 min-1) was approximately four times faster than the d-MnO2 nanoparticles (rate constant:0.0067 min-1). This observation could be attributed to the higher reducing and oxidizing power of ZnO in producing free radicals for photodegradation of RhB solution.

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Periodical:

Edited by:

Akrajas Ali Umar, Muhamad Mat Salleh and Muhammad Yahaya

Pages:

167-174

DOI:

10.4028/www.scientific.net/MSF.756.167

Citation:

Y. L. Chan et al., "Photocatalytic Degradation of Rhodamine B Using MnO2 and ZnO Nanoparticles", Materials Science Forum, Vol. 756, pp. 167-174, 2013

Online since:

May 2013

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$35.00

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