SrNb2O6/Nb2O5复合物光催化降解甲基橙的研究

无机材料学报, 2007, 22(5): 927-930. doi: 10.3724/SP.J.1077.2007.00927

SrNb₂O₆/Nb₂O₅复合物光催化降解甲基橙的研究

(1. State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China

2. 2. Department of Material Science and Technology, Shanghai University, Shanghai 200072, China.)

关键词：光催化 , methyl orange , SrNb₂O₆ , SrNb₂O₆/Nb₂O₅ heterojunction

Photocatalytic Degradation of Methyl Orange via SrNb2O6 and SrNb₂O₆/Nb₂O₅ Composite

XING Jing-Cheng1 , BIAN Jian-Jiang , YANG Jian-Hua , HUANG Fu-Qiang

Keywords： photocatalytic , 甲基橙 , SrNb₂O₆ , 异质结(SrNb₂O₆/Nb₂O₅)

光催化剂SrNb₂O₆采用传统固相反应分别在合成温度为950℃(低温)和1400℃(高温)进行制备. 通过XRD粉末衍射和UV-Vis吸收光谱分析, 表征
了样品的物相和光谱吸收特性. 通过对高低温样品的测试和分析表明, 高温样品具有单一的物相, 而低温样品反应并不完全, 是一个混合物. 在SrNb₂O₆光催化活性研究中, 常用的甲基橙被选作染料光降解模型, 对比试验表明低温样品的光催化活性远高于纯相样品SrNb₂O₆或Nb₂O₅. 经过讨论和分析, 推断出低温产物中存在的异质结(SrNb₂O₆/Nb₂O₅)是提高光催化性能的根本原因.

SrNb₂O₆ powders were prepared by a conventional solid-state method and characterized by X-ray powder diffraction and UV-Vis diffuse reflection spectra. Their photocatalytic activities were investigated on the degradation of methyl orange. The results show that the photocatalytic activity of pure phase SrNb₂O₆ calcined at 1400℃ is lower than that of the impure
phase SrNb₂O₆ calcined at 950℃. The heterojunction model is used to explain that the impure sample can improve the photocatalytic activity due to the interface interaction of Nb₂O₅ and SrNb₂O₆.

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