研究目的
To fabricate ZnO nanostructures of different morphologies in large scale through a solvent-free soft mechanochemical process and study their photocatalytic dye degradation performance.
研究成果
ZnO nanostructures of different morphologies were successfully fabricated in large scale through a solvent-free soft mechanochemical process. The nanostructures showed high photocatalytic performance for cationic dye degradation under UV illumination, with the high concentration of basic sites at the surface being the principal responsible for their high photocatalytic activity. The process is extremely attractive for fabricating ZnO nanostructures for dye removal from industrial effluents due to its large scale production ability, low cost processing, and high dye degradation ability.
研究不足
The study focuses on the photocatalytic degradation of anionic dye molecules such as Methylene Blue (MB) under UV illumination. The effects of other types of dyes or under different light conditions were not explored.
1：Experimental Design and Method Selection:
Utilized a simple, cost-effective mechanochemical synthesis in absence of solvent. Effects of ionic and nonionic surfactants along with the concentration of hydrolyzing agent on the evolution of nanostructure morphology were studied.
2：Sample Selection and Data Sources:
Zinc Acetate dihydrate (ZnAc) and CTAB or PVP in 2:1 molar ratio were mixed in a ceramic mortar for about 30 min. NaOH was added and manually grinded for another 30 min at room temperature.
3：List of Experimental Equipment and Materials:
Ceramic mortar, zinc acetate dihydrate, sodium hydroxide (NaOH), Cetyltrimethylammonium Bromide (CTAB), Polyvinylpyrrolidone (PVP), Shimadzu UV-3101 PC UV-Vis-NIR double-beam spectrophotometer, JEOL JSM-7800F Field-Emission Scanning Electron Microscope (FESEM), JEOL JEM 2100F field emission transmission electron microscope (FE-TEM), Belsorp-Mini II (BEL Japan, Inc.) analyzer.
4：Experimental Procedures and Operational Workflow:
The obtained white pastes were dispersed in water and washed with ethanol and water several times by centrifugation. Obtained samples were dried at room temperature and annealed thereafter at 350°C for 2 h in air.
5：Data Analysis Methods:
The crystallinity and structural phase of the nanostructures were analyzed through powder X-Ray Diffraction (XRD) and micro Raman spectroscopy. Morphology and elemental analysis were performed using FESEM. Specific surface area and average pore size were estimated utilizing Brunauer-Emmett-Teller (BET) procedure.
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