TY - JOUR
T1 - Effect of γ-irradiation on the growth of ZnO nanorod films for photocatalytic disinfection of contaminated water
AU - Alarcón, Julio
AU - Ponce, Silvia
AU - Paraguay-Delgado, Francisco
AU - Rodríguez, Juan
PY - 2011/12/1
Y1 - 2011/12/1
N2 - The growth of ZnO nanorods on a flat substrate containing γ-irradiated seeds and their ability to photocatalytically eliminate bacteria in water were studied. The seed layer was obtained, by the spray pyrolysis technique, from zinc acetate solutions γ-irradiated within the range from 0 to 100. kGy. Subsequently, to grow the rods, the seeds were immersed in a basic solution of zinc nitrate maintained at 90 °C. The rate of crystal growth on the seed layer during the thermal bath treatment was kept constant.The resulting materials were characterized morphologically by scanning electron and atomic force microscopies; X-ray diffraction was used to study their morphology and structure and ultraviolet-visible spectroscopy to determine their absorbance. The obtained seed films were morphologically dependent on the radiation dose and this was correlated with the ZnO nanorod films which presented a texture in the (0. 0. 2) direction perpendicular to the substrate. The rods have a hexagonal mean cross section between 20 and 140. nm. Using these rods, the photocatalytic degradation of Escherichia coli bacteria in water was studied; a positive influence of the crystalline texture on the degradation rate was observed. © 2011 Elsevier Inc.
AB - The growth of ZnO nanorods on a flat substrate containing γ-irradiated seeds and their ability to photocatalytically eliminate bacteria in water were studied. The seed layer was obtained, by the spray pyrolysis technique, from zinc acetate solutions γ-irradiated within the range from 0 to 100. kGy. Subsequently, to grow the rods, the seeds were immersed in a basic solution of zinc nitrate maintained at 90 °C. The rate of crystal growth on the seed layer during the thermal bath treatment was kept constant.The resulting materials were characterized morphologically by scanning electron and atomic force microscopies; X-ray diffraction was used to study their morphology and structure and ultraviolet-visible spectroscopy to determine their absorbance. The obtained seed films were morphologically dependent on the radiation dose and this was correlated with the ZnO nanorod films which presented a texture in the (0. 0. 2) direction perpendicular to the substrate. The rods have a hexagonal mean cross section between 20 and 140. nm. Using these rods, the photocatalytic degradation of Escherichia coli bacteria in water was studied; a positive influence of the crystalline texture on the degradation rate was observed. © 2011 Elsevier Inc.
UR - https://hdl.handle.net/20.500.12724/2256
UR - https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=80053189709&origin=inward
UR - https://www.scopus.com/inward/citedby.uri?partnerID=HzOxMe3b&scp=80053189709&origin=inward
U2 - 10.1016/j.jcis.2011.08.025
DO - 10.1016/j.jcis.2011.08.025
M3 - Article (Contribution to Journal)
SN - 0021-9797
SP - 49
EP - 55
JO - Journal of Colloid and Interface Science
JF - Journal of Colloid and Interface Science
ER -