Rapid methyl orange degradation using porous ZnO spheres photocatalyst.
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 ~96.3% within the initial 120min, which is attributed to the porous nature, large specific surface area (114.6m(2)g(-1)), narrow pore size distribution (~2.5 to 25nm) evaluated from N2 adsorption-desorption isotherms analysis and excellent electron accepting features of the engineered porous ZnO spheres.
Department of BIN Fusion Technology, Department of Polymer-Nano Science & Technology, Polymer BIN Research Center, Chonbuk National University, 567 Baekje-daero, Deokjin-gu, Jeonju 561-756, Republic of Korea.
Nirmalya
N
Tripathy
School of Semiconductor and Chemical Engineering, Nanomaterials Processing Research Center, Chonbuk National University, 567 Baekjedaero, Deokjin-gu, Jeonju 561-756, Republic of Korea.
Rafiq
R
Ahmad
Department of BIN Fusion Technology, Department of Polymer-Nano Science & Technology, Polymer BIN Research Center, Chonbuk National University, 567 Baekje-daero, Deokjin-gu, Jeonju 561-756, Republic of Korea.
Hyeon
H
Kuk
Department of BIN Fusion Technology, Department of Polymer-Nano Science & Technology, Polymer BIN Research Center, Chonbuk National University, 567 Baekje-daero, Deokjin-gu, Jeonju 561-756, Republic of Korea.
Dae Hoon
DH
Lee
School of Semiconductor and Chemical Engineering, Nanomaterials Processing Research Center, Chonbuk National University, 567 Baekjedaero, Deokjin-gu, Jeonju 561-756, Republic of Korea.
Yoon-Bong
YB
Hahn
Department of BIN Fusion Technology, Department of Polymer-Nano Science & Technology, Polymer BIN Research Center, Chonbuk National University, 567 Baekje-daero, Deokjin-gu, Jeonju 561-756, Republic of Korea. Electronic address: gskhang@chonbuk.ac.kr.
Gilson
G
Khang
D001391:Azo Compounds / Q000737:chemistry*; D002384:Catalysis; D008855:Microscopy, Electron, Scanning; D046529:Microscopy, Electron, Transmission; D010782:Photolysis / Q000528:radiation effects; D016062:Porosity; D014466:Ultraviolet Rays; D014961:X-Ray Diffraction; D015034:Zinc Oxide / Q000737:chemistry*
D001391:Azo Compounds; C100258:methyl orange; D015034:Zinc Oxide
Methyl orange; Photocatalyst; Porous ZnO spheres; UV–visible spectroscopy