由铁鳞制备纳米氧化铁可见光光催化剂

Hydrothermal synthesis of nanostructured iron oxide visible-light photocatalysts from mill scales

以铁鳞为原料,采用水热法成功制备不同形貌的纳米Fe2O3光催化剂.探讨了不同浓度的盐酸、液固比及反应时间对铁鳞浸出规律的影响.系统研究了铁鳞浸出液的纯度对于水热法制备纳米Fe2O3的微观形貌和光催化性能的影响.结果表明:8 g铁鳞与150 m L浓度为3 mol·L-1的盐酸溶液在100℃回流反应2 h,铁鳞的浸出率达到约93%且浸出液纯度较高.浸出液中的杂质离子改变了纳米Fe2O3的微观形貌和晶体的择优生长方向.另外,以铁鳞为原料制备出的纳米Fe2O3可见光光催化性能较好,光降解罗丹明B溶液60 min后,其降解率可达87%左右.

Nanostructured Fe2 O3 visible light photocatalysts with different morphologies were successfully synthesized from mill scales using a hydrothermal method. The leaching efficiency of mill scales was discussed by changing the leaching parameters such as hydrochloric acid concentration, liquid-to-solid ratio and reaction time. The dependences of the morphology and photocatalytic property of as-prepared Fe2 O3 on the purity of leachates were investigated during hydrothermal synthesis. When the reflux reaction between 8 g of iron scales and 150 mL of 3 mol·L-1 HCl proceeds at 100℃ for 2 h, the leaching rate of iron scales reaches about 93% and the purity of leachates is high. It is indicated that impurity ions in the leachates play an important role in controlling the microstructure and the crystal growth direction of the nanostructured Fe2 O3 . Moreover, the nanostructured Fe2 O3 has a better photocatalytic property, and it can degrade rhodamine B solution up to about 87% after 60 min under visible light illumination.