Visible Light-Induced Degradation of Methylene Blue in the Presence of Photocatalytic ZnS and CdS Nanoparticles
ZnS and CdS nanoparticles were prepared by a simple microwave irradiation method under mild conditions. The obtained nanoparticles were characterized by XRD, TEM and EDX. The results indicated that high purity of nanosized ZnS and CdS was successfully obtained with cubic and hexagonal crystalline st...
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doaj-f4b3753e31e34a0fb43be26161ea0a452020-11-24T21:17:07ZengMDPI AGInternational Journal of Molecular Sciences1422-00672012-09-011310122421225810.3390/ijms131012242Visible Light-Induced Degradation of Methylene Blue in the Presence of Photocatalytic ZnS and CdS NanoparticlesParisa VaziriManizheh NavaseryAlam AbediniGhazaleh BahmanrokhMaryam ErfaniMohd Zobir HusseinElias SaionNayereh SoltaniZnS and CdS nanoparticles were prepared by a simple microwave irradiation method under mild conditions. The obtained nanoparticles were characterized by XRD, TEM and EDX. The results indicated that high purity of nanosized ZnS and CdS was successfully obtained with cubic and hexagonal crystalline structures, respectively. The band gap energies of ZnS and CdS nanoparticles were estimated using UV-visible absorption spectra to be about 4.22 and 2.64 eV, respectively. Photocatalytic degradation of methylene blue was carried out using physical mixtures of ZnS and CdS nanoparticles under a 500-W halogen lamp of visible light irradiation. The residual concentration of methylene blue solution was monitored using UV-visible absorption spectrometry. From the study of the variation in composition of ZnS:CdS, a composition of 1:4 (by weight) was found to be very efficient for degradation of methylene blue. In this case the degradation efficiency of the photocatalyst nanoparticles after 6 h irradiation time was about 73% with a reaction rate of 3.61 × 10−3 min−1. Higher degradation efficiency and reaction rate were achieved by increasing the amount of photocatalyst and initial pH of the solution.http://www.mdpi.com/1422-0067/13/10/12242ZnSCdSnanoparticlesphotocatalyticvisible lightdegradationmethylene bluepH |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Parisa Vaziri Manizheh Navasery Alam Abedini Ghazaleh Bahmanrokh Maryam Erfani Mohd Zobir Hussein Elias Saion Nayereh Soltani |
spellingShingle |
Parisa Vaziri Manizheh Navasery Alam Abedini Ghazaleh Bahmanrokh Maryam Erfani Mohd Zobir Hussein Elias Saion Nayereh Soltani Visible Light-Induced Degradation of Methylene Blue in the Presence of Photocatalytic ZnS and CdS Nanoparticles International Journal of Molecular Sciences ZnS CdS nanoparticles photocatalytic visible light degradation methylene blue pH |
author_facet |
Parisa Vaziri Manizheh Navasery Alam Abedini Ghazaleh Bahmanrokh Maryam Erfani Mohd Zobir Hussein Elias Saion Nayereh Soltani |
author_sort |
Parisa Vaziri |
title |
Visible Light-Induced Degradation of Methylene Blue in the Presence of Photocatalytic ZnS and CdS Nanoparticles |
title_short |
Visible Light-Induced Degradation of Methylene Blue in the Presence of Photocatalytic ZnS and CdS Nanoparticles |
title_full |
Visible Light-Induced Degradation of Methylene Blue in the Presence of Photocatalytic ZnS and CdS Nanoparticles |
title_fullStr |
Visible Light-Induced Degradation of Methylene Blue in the Presence of Photocatalytic ZnS and CdS Nanoparticles |
title_full_unstemmed |
Visible Light-Induced Degradation of Methylene Blue in the Presence of Photocatalytic ZnS and CdS Nanoparticles |
title_sort |
visible light-induced degradation of methylene blue in the presence of photocatalytic zns and cds nanoparticles |
publisher |
MDPI AG |
series |
International Journal of Molecular Sciences |
issn |
1422-0067 |
publishDate |
2012-09-01 |
description |
ZnS and CdS nanoparticles were prepared by a simple microwave irradiation method under mild conditions. The obtained nanoparticles were characterized by XRD, TEM and EDX. The results indicated that high purity of nanosized ZnS and CdS was successfully obtained with cubic and hexagonal crystalline structures, respectively. The band gap energies of ZnS and CdS nanoparticles were estimated using UV-visible absorption spectra to be about 4.22 and 2.64 eV, respectively. Photocatalytic degradation of methylene blue was carried out using physical mixtures of ZnS and CdS nanoparticles under a 500-W halogen lamp of visible light irradiation. The residual concentration of methylene blue solution was monitored using UV-visible absorption spectrometry. From the study of the variation in composition of ZnS:CdS, a composition of 1:4 (by weight) was found to be very efficient for degradation of methylene blue. In this case the degradation efficiency of the photocatalyst nanoparticles after 6 h irradiation time was about 73% with a reaction rate of 3.61 × 10−3 min−1. Higher degradation efficiency and reaction rate were achieved by increasing the amount of photocatalyst and initial pH of the solution. |
topic |
ZnS CdS nanoparticles photocatalytic visible light degradation methylene blue pH |
url |
http://www.mdpi.com/1422-0067/13/10/12242 |
work_keys_str_mv |
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