| Summary: | 碩士 === 國立虎尾科技大學 === 材料科學與綠色能源工程研究所 === 98 === In this study, nanophases zinc and tin oxides were prepared by the sol-gel process. The effects of various dopants on the sol-gel reaction, phase structure, microstructure and photodegradation property were investigated.
Clear sols were formed by adding various ions. Transparent gels could be obtained by adding proper solvents. Nanophases zinc and tin oxides (ZnO:χSnO2 ; χ = 0.5~10 molar ratio) were formed after heat-treatments at 400~600 oC. The crystallinities of zinc and tin oxides were remarkable increase with temperature. With increasing temperature, the nanoparticle sizes were obviously increase and transfer to nanorod morphologies. Nanoparticle sizes decreased with increasing the amount of tin oxide. After firing at 400 oC, the powders has granular morphology with average grain sizes about 10~12 nm.
Photodegradation of methyl orange (MO) showed the degradation rate reach to 60 % under UV-light irradiation. With doping different ions the degradation rate could improve to 97~99 %. In addition, photodegradation of AO7 (Acid Orange 7) showed the degradation rate reach to 88~98% under UV-light irradiation. Photodegradation analysis showed the relative degradation depended on the process parameters, energy gap and electron-hole recombination rate.
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