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Synthesis and photocatalytic performance of spongy ZnO microstructures

Zou Y. L., Li Y., Wang Q., An D. M., Lian X. X., Lv T.

Materials Science Poland

2015

Vol. 33, No. 2

230--236

Spongy ZnO microstructures were synthesized via a facile hydrothermal method using zinc nitrate hexahydrate and oxalic acid as raw materials. The as-obtained ZnO were characterized by powder X-ray diffractometry (XRD), field emission scanning electron microscopy (FESEM), and transmission electron spectroscopy (TEM), respectively. The BET surface area and average pore size of the samples were determined by nitrogen adsorption-desorption analysis. Effects of precursor and hydrothermal temperature on the morphology and photocatalytic activity of the products were investigated. SEM and TEM analysis indicated that the as-obtained spongy ZnO microstructures consisted of a large amount of ZnO particles with the average size of about 100 to 150 nm. The photocatalytic activities of the spongy ZnO microstructures were evaluated by photodegradation of methylene blue (MB) under UV light radiation. The results indicated that the ZnO synthesized at 150 °C for 10 h showed the highest photocatalytic activity and the degradation ratio of MB reached 99.5 % for 60 min of UV light irradiation with the light intensity of 10 mW cm-2.

Morphology and characterization of cockloft-like ZnO/morin hybrid

Li Y., Zou Y. L.

Materials Science Poland

2010

Vol. 28, No. 3

741--748

Morin modified multilayer ZnO with a cockloft-like morphology was fabricated in alcohol solution, using hydrothermally synthesized ZnO nanodisks and morin as the precursors. The samples were characterized by field emission scanning electron microscopy, X-ray diffractometry, Fourier transform infrared spectroscopy and fluorescence spectroscopy. The results show that the cockloft-like ZnO hybrid, having hexangular morphology with the diameter of 1.5-2 žm and the thickness of ca. 1 žm, is composed of a multilayer flatform stacked by numerous ZnO nanodisks in its middle and a meshlike muffle made up of countless morin nanoparticles with the diameter of ca. 40 nm. The UV emission of the as-fabricated product is obviously attenuated by morin nanoparticles assembling on the surface of the ZnO nanodisks.