Fe_2O_3-TiO_2复合催化剂的制备及其光催化降解染料模拟废水的研究
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摘要
本研究以工业级氧化铁黄为原料，经过煅烧处理得到Fe_2O_3，并以此为原料，与钛酸丁酯、乙醇溶液混合，用溶胶凝胶法制得Fe_2O_3—TiO_2复合催化剂。采用XRD、XPS、TEM、BET等分析手段研究了催化剂的性能和结构，并用制备的催化剂在不同光源下处理酸性大红和柠檬黄染料废水，得出以下结论：
(1)在300℃煅烧2h所制得的质量比为19.6％的复合光催化剂TiO_2／Fe_2O_3，经XRD、TEM、BET、XPS表征，可知负载在Fe_2O_3上的TiO_2呈纳米状，且均匀分布在表面。
(2)当pH=6，初始浓度为20mg／L，投加量为0.4g／L，1000w氙灯照射下，对酸性大红染料废水，2h后去除率高达92.7％，而同样条件下的吸附仅为47.2％。不仅具有良好的吸附性能，而且有良好的光催化效果。
(3)通过高温焙烧法实现了复合光催化剂的重复利用。300℃焙烧2h条件下回收，作为光催化剂重复使用，1000w氙灯为光源对20mg／L的酸性大红染料废水进行光催化降解，重复使用3次的去除率下降仅为6.7％；300w高压汞灯为光源对20mg／L柠檬黄染料溶液的光催化降解，重复使用4次对染料的脱色率下降仅为9.1％，有良好的回收利用价值。
(4)300w高压汞灯照射下，pH=6，初始浓度为20mg／L，投加量为0.4g／L，反应2h后对柠檬黄染料的脱色率高达99.9％，且光催化效果好于纯TiO_2的效果，30min即可达到99.6％以上的脱色率。
In this research, Fe_2O_3→TiO_2 were prepared by iron oxide yellow after deadburining, butyl titanate and ethanol by using sol-gel method, The sample were characterized by XRD, XPS TEM BET techniques. Acid scarlet and Tartrazine dyestuff were treated by the Fe_2O_3→TiO_2 photocatalysis, The results showed that:
(1) Through characterized by XRD, TEM, BET, XPS, the TiO_2 of the surface of 19.6% TiO_2/Fe_2O_3 by calcine at 300℃for 2h were even spread and the TiO_2 were nanocomposites.
(2) pH=6,initial concentration was 20mg/L, dosage is 0.4g/l, 1000w xenon lamp lights, after 2h, the degradation for acid scarlet dyestuff was 92.7% and adsorption rate is only 47.2%. So its not only a good adsorbability also have excellent photocatalysis effect.
(3) Compositing catalyst is reused through the method of calcining, after calcine at 300℃for 2 hours, removing ratio for acid scarlet dyestuff only reduces 6.7% on 1000w xenon lamp lights for reuse 3 times and removing ratio for tartrazine dyestuff only reduces 9.1 % with 300w high-pressure mercury lamp for reuse 4 times. It has high value for recovery utilization.
(4) It has better photocatalysis effect on Tartrazine with 300w high - pressure mercury lamp than without it. The degradation can reach more than 99.6% within 30 minutes.
(1)在300℃煅烧2h所制得的质量比为19.6％的复合光催化剂TiO_2／Fe_2O_3，经XRD、TEM、BET、XPS表征，可知负载在Fe_2O_3上的TiO_2呈纳米状，且均匀分布在表面。
(2)当pH=6，初始浓度为20mg／L，投加量为0.4g／L，1000w氙灯照射下，对酸性大红染料废水，2h后去除率高达92.7％，而同样条件下的吸附仅为47.2％。不仅具有良好的吸附性能，而且有良好的光催化效果。
(3)通过高温焙烧法实现了复合光催化剂的重复利用。300℃焙烧2h条件下回收，作为光催化剂重复使用，1000w氙灯为光源对20mg／L的酸性大红染料废水进行光催化降解，重复使用3次的去除率下降仅为6.7％；300w高压汞灯为光源对20mg／L柠檬黄染料溶液的光催化降解，重复使用4次对染料的脱色率下降仅为9.1％，有良好的回收利用价值。
(4)300w高压汞灯照射下，pH=6，初始浓度为20mg／L，投加量为0.4g／L，反应2h后对柠檬黄染料的脱色率高达99.9％，且光催化效果好于纯TiO_2的效果，30min即可达到99.6％以上的脱色率。
In this research, Fe_2O_3→TiO_2 were prepared by iron oxide yellow after deadburining, butyl titanate and ethanol by using sol-gel method, The sample were characterized by XRD, XPS TEM BET techniques. Acid scarlet and Tartrazine dyestuff were treated by the Fe_2O_3→TiO_2 photocatalysis, The results showed that:
(1) Through characterized by XRD, TEM, BET, XPS, the TiO_2 of the surface of 19.6% TiO_2/Fe_2O_3 by calcine at 300℃for 2h were even spread and the TiO_2 were nanocomposites.
(2) pH=6,initial concentration was 20mg/L, dosage is 0.4g/l, 1000w xenon lamp lights, after 2h, the degradation for acid scarlet dyestuff was 92.7% and adsorption rate is only 47.2%. So its not only a good adsorbability also have excellent photocatalysis effect.
(3) Compositing catalyst is reused through the method of calcining, after calcine at 300℃for 2 hours, removing ratio for acid scarlet dyestuff only reduces 6.7% on 1000w xenon lamp lights for reuse 3 times and removing ratio for tartrazine dyestuff only reduces 9.1 % with 300w high-pressure mercury lamp for reuse 4 times. It has high value for recovery utilization.
(4) It has better photocatalysis effect on Tartrazine with 300w high - pressure mercury lamp than without it. The degradation can reach more than 99.6% within 30 minutes.
引文
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