α-Fe_2O_3柱撑钛铌酸复合材料的制备与光催化性能

Preparation and Photocatalytic Activity of α-Fe_2O_3-pillared HTiNbO_5

剥离–重堆积法制备的α-Fe2O3/HTi Nb O5柱撑复合材料呈介孔结构,比表面积达140 m2·g–1。当α-Fe2O3∶HTi Nb O5摩尔比为1∶2时,在可见光照射下,复合材料催化降解罗丹明B的效率达38%,分别是HTi Nb O5和Fe2O3的3.2倍和1.7倍。复合材料的高光催化活性主要来自于HTi Nb O5主体与α-Fe2O3客体间形成的异质结,使材料吸收边红移至可见光区,改善了光生载流子的分离效率,从而提高了材料的光催化活性。

Heterostructured α-Fe2O3-pillared H2Ti307 nanohybrids were prepared through an exfoliation- restacking route. It was revealed that the present nanohybrids are mesoporous with specific surface areas of 140 m2-g-~. The nanohybrids exhibit high photocatalytic activity in the degradation of Rhodamine B under visible-light irradiation. When the preparation molar ratio of α-Fe2O3： HTiNbO5 was 1 ： 2, the nanohybrid reaches a high degradation rate of 38 %, which is 3.2 and 1.7 times higher than its parents HTiNbOs and α-Fe2O3, respectively. The superior photocatalytic performance of the nanohybrids is predominantly attributed to the heterostructure between the titanoniobate host nanosheets and CdS guest nanoparticles, which re-shit＇s the absorption onsets of nanohybrids, improves the separation efficiency of photoinduced carriers and ultimately enhances the photocatalytic activity of the materials.