积分球
煅烧
吸收(声学)
光致发光
材料科学
协调球
光催化
二氧化钛
吸收边
外层电子转移
内球面电子转移
分析化学(期刊)
化学
纳米技术
核化学
金属
带隙
光学
复合材料
催化作用
光电子学
色谱法
冶金
物理
有机化学
离子
作者
Jiabai Cai,WU Xi-sheng,Fang Zheng,Shunxing Li,Yaling Wu,Yunting Lin,Liting Lin,Biwen Liu,Qiaoying Chen,Lin Li
标识
DOI:10.1016/j.jcis.2016.11.025
摘要
After [email protected] dioxide ([email protected]2) composite with different size was calcined at designated temperature, TiO2 hollow sphere with controllable size was obtained for high efficient photo-reduction of Cr(VI). The feature of the TiO2 hollow sphere was investigated by SEM, TEM, XRD, UV–Vis, and photoluminescence. The photo-reduction of Cr(VI) were measured for the performance assessment of the TiO2 hollow sphere, Cr(VI) was used as an electron acceptor. After irradiation for 2 h, the photo-reduction rate of Cr(VI) (pH = 2.82) for TiO2(450 nm) was 96%, which exhibited an increase of 5% and 8% compared with TiO2(370 nm) and TiO2(600 nm). The absorption edges of TiO2 hollow sphere (450 nm) was largest with the increasing of hollow sphere size from 370 to 600 nm. The optimal hollow sphere size of TiO2 was 450 nm for the photo-reduction of Cr(VI), because the light-harvesting efficiency (the best of absorption edge) and photo-generated electron-hole separation rate (the best of photo-reduction rate) of TiO2 hollow sphere were controlled by its hollow sphere size. In addition, we find that the behavior of the hydrogen production was inhibited by the coexistence Cr(VI) solution. This study can improve our understanding of the mechanism for the activity enhancement by the optimal hollow sphere size of TiO2.
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