甘氨酸辅助合成BiOI及其模拟太阳光光催化性能研究

发布时间：2018-07-12 12:18

本文选题：甘氨酸 + BiOI　；参考：《无机材料学报》2017年02期

【摘要】：以甘氨酸分子作为模板,硝酸铋作为铋源,采用水热合成的方法一步制备了尺寸均一的具有片层花状微球形貌的四方晶相Bi OI光催化材料。通过X射线粉末衍射(XRD)、扫描电子显微镜(SEM)、紫外可见漫反射光谱(UV-Vis/DRS)、N_2吸附脱附等手段考察了五水硝酸铋与甘氨酸的摩尔比、水热反应时间对BiOI材料形貌、晶相结构及光学吸收等物理化学性质的影响。进一步以罗丹明B和水杨酸为目标污染物对其模拟太阳光光催化性能进行了评价。实验结果显示,当五水硝酸铋与甘氨酸的摩尔比为1:2,水热时间为12 h所合成的BiOI光催化降解活性最高。经40 min模拟太阳光照射后,罗丹明B和水杨酸的反应速率常数分别达到0.0232和0.0223 min-1,与未添加甘氨酸同等条件下合成的BiOI的反应速率常数(0.0111和0.0143 min~(-1))相比,有显著提升。光催化活性提高的主要原因是甘氨酸辅助合成的Bi OI材料具有更为规则的形貌和更大的比表面积。
[Abstract]:Using glycine molecule as template and bismuth nitrate as bismuth source, tetragonal phase BiOI photocatalytic materials with lamellar flower-like microspheres were prepared by hydrothermal synthesis. The molar ratio of bismuth nitrate pentahydrate to glycine and the morphology of BiOI materials were investigated by means of X-ray powder diffraction (XRD), scanning electron microscopy (SEM), UV-Visa / Vis diffuse reflectance spectroscopy (UV-Vis-P / DRS) and adsorption and desorption of N _ (2) O _ (2) O _ (2), respectively. The effect of crystal structure and optical absorption on physical and chemical properties. Furthermore, Rhodamine B and salicylic acid were used as target pollutants to evaluate their photocatalytic performance. The results showed that when the molar ratio of bismuth nitrate pentahydrate to glycine was 1: 2, and the hydrothermal time was 12 h, the photocatalytic degradation activity of BiOI was the highest. After 40 min simulated solar irradiation, the reaction rate constants of Rhodamine B and salicylic acid reached 0.0232 and 0.0223 min-1, respectively, which were significantly higher than those of BiOI (0.0111 and 0.0143 min-1) synthesized without glycine. The main reason for the increase of photocatalytic activity is that the BiOI materials synthesized by glycine have more regular morphology and larger specific surface area.
【作者单位】：东北师范大学环境学院;
【基金】：国家自然科学基金(51478095;51238001;51508078;51578118) 教育部新世纪优秀人才支持计划(NCET-13-0723) 吉林省科技发展计划项目(20160520023JH) 吉林省教育厅“十二五”科学技术研究项目(2014B043)~~
【分类号】：O643.36

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