期刊
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY
卷 161, 期 -, 页码 312-317出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jphotobiol.2016.06.003
关键词
Porous ZnO spheres; Photocatalyst; Methyl orange; UV-visible spectroscopy
资金
- Bio & Medical Technology Development Program of the NRF - Korean govern-ment (MEST) [NRF-2012M3A9C6050204]
- Bio & Medical Technology Development Program of the NRF - BK21 PLUS
Porous zinc oxide (ZnO) spheres were synthesized by facile low temperature solution route. The as-synthesized porous ZnO spheres were characterized in detail in terms of their morphological, structural, optical and photocatalytic properties using field-emission scanning electron microscopy (FESEM, equipped with energy dispersive spectroscopy (EDS)), transmission electron microscopy (TEM), high-resolution TEM (HRTEM), X-ray diffractometer (XRD), UV-visible spectroscopy and Raman-scattering measurements. Nitrogen adsorption-desorption analysis was performed to determine pore size distribution from the adsorption isotherm curves using the Barrett-Joyner-Halenda (BJH) method. Morphological and structural characterizations showed porous nature of ZnO spheres with high surface area, good crystallinity, wurtzite hexagonal phase and good optical features. Next, ZnO spheres were studied as photocatalyst for photodegradation of harmful dye, methyl orange (MO). Under ultraviolet light irradiation, the decrease in MO dye concentration was monitored by UV-visible spectroscopy at different time intervals until the dye was completely degraded to colorless end product. Rapid MO dye decomposition was observed with a degradation rate of similar to 963% within the initial 120 min, which is attributed to the porous nature, large specific surface area (114.6 m(2) g(-1)), narrow pore size distribution (similar to 2.5 to 25 nm) evaluated from N-2 adsorption-desorption isotherms analysis and excellent electron accepting features of the engineered porous ZnO spheres. (C) 2016 Elsevier B.V. All rights reserved.
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