【摘要】 采用水热法制备了铁掺杂二氧化钛晶体粉末,以FT-IR和XRD对产物进行了结构表征,研究了以自制的二氧化钛粉末为光催化剂在可见光或紫外光照射下对甲基紫溶液的催化降解行为。FT-IR分析表明,水热法制得的二氧化钛结构中含有大量羟基(对应于1636和3400cm-1的吸收),说明它有较好的光催化活性,其中1126,1050 cm-1的吸收为Ti-O-C弯曲振动所致,520 cm-1吸收则对应Ti-O-Ti弯曲振动;XRD测试结果表明,制得的二氧化钛粉末的晶型属于锐钛矿型;光催化结果表明:相同条件下,紫外光催化甲基紫的效率好于可见光;在优化条件下(在4 mg·L-1的甲基紫溶液中,加0.1800 g自制的掺铁二氧化钛晶体粉末,室温下用40 W的白炽灯或λ=365 nm紫外光照下反应2 h),掺铁量为2%(摩尔分数)二氧化钛晶体粉末对甲基紫的降解率最大分别为59.36%和95.03%,掺铁量为0%的二氧化钛的光催化降解率分别为26.41%和40.28%,掺铁量为8%的二氧化钛的光催化降解率分别达到37.34%和48.44%。更多还原

【Abstract】 Fe3+-doping titanium dioxide crystal powders were prepared by hydrothermal method and were characterized by means of FT-IR and XRD,and the degeneration of methyl violet photocatalyzed(under Vis or UV) by as-prepared titanium dioxide crystal powders was studied.The FT-IR results showed that titanium dioxide crystals prepared by hydrothermal method contained a large number OH groups corresponding to the absorption of 1636 and 3400 cm-1,which meant that as-prepared titanium dioxide crystal powders would possess better photocatalytic performance,also by FT-IR analysis,the bending vibration of Ti-O-C caused the absorption of 1126 and 1050 cm-1,and the bending vibration of Ti-O-Ti brought about the absorption of 520 cm-1.The XRD results indicated that as-prepared titanium dioxide crystals were anatase.The photocatalysis results revealed that photocatalytic performance of methyl violet under UV was better than under Vis at the same conditions and the best degeneration rate of methyl violet photocatalyzed by Fe3+-doped(mole ratio) 2% anatase titanium dioxide crystals were both 59.36% and 95.03% under follow optimized conditions: adding 0.1800 g as-prepared Fe3+-doped A-TiO2 into the 4 mg · L-1 methyl violet solution illuminated by visible light or UV(λ=365 nm),stirring quickly at room temperature for 2 h,the degeneration rate of methyl violet were 26.41% and 40.28%,37.34% and 48.44% severally photocatalyzed by adding 0% and 8% Fe3+-doped A-TiO2 at the same conditions.更多还原