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Photocatalytic oxidation of benzene by ZnO coated on glass plates under simulated sunlight

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Abstract

The photocatalytic oxidation of benzene by ZnO nanoparticles coated on glass plates was studied under simulated sunlight. ZnO nanoparticles were coated on three glass plates by heat attachment method. To evaluate the photocatalytic removal of benzene, coated plates were irradiated by metal halide lamp in a rectangular reactor in batch mode. The effect of initial pollutant concentration, temperature, relative humidity, irradiation time, concentration of zinc oxide suspension, were assessed. The surface morphology and structure of ZnO nanoparticles and ZnO coated on glass plates were characterized by scanning electron microscopy, X-ray diffraction and field emission scanning electron microscopy. Sampling and analysis of benzene were performed according to NIOSH method. To analyze the concentration of benzene, gas chromatography with flame ionization detector (GC-FID) was used. Results indicated that photocatalytic process by ZnO under irradiation of metal halide lamp could remove benzene at optimum experimental conditions. Coating of glass plates by ZnO suspension, resulted in 57% removal of benzene as concentration of 50 ppm at 45 °C, and relative humidity of 40% after 240 min irradiation of metal halide lamp. Results indicated that photocatalytic oxidation process by ZnO nanoparticles can be used as a proper and environmentally friendly method for removing low concentrations of benzene from polluted air under simulated sunlight.

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Acknowledgements

This study was funded by Iran University of Medical Sciences (Grant number: 27576). The authors gratefully acknowledge Iran University of Medical Sciences for financially supporting this study.

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Correspondence to Masoumeh Hasham Firooz.

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Jafari, A.J., Kalantari, R.R., Kermani, M. et al. Photocatalytic oxidation of benzene by ZnO coated on glass plates under simulated sunlight. Chem. Pap. 73, 635–644 (2019). https://doi.org/10.1007/s11696-018-0621-5

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  • DOI: https://doi.org/10.1007/s11696-018-0621-5

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