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BiOI光催化材料.通过X射线粉末衍射(XRG)、扫描电子显微镜(SEM)、紫外-可见漫反射光谱(UV-Vis/DRS)、N2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0.0223min-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BiOI材料具有更为规则的形貌和更大的比表面积.
Tetragonal BiOI with uniform size petal composed microspheres morphology was synthesized by one-step hydrothermal method using glycine molecules as templates and Bismuth nitrate as the source of Bi3+.The physicochemical properties of the fabricated BiOI was characterized by X-ray powder diffraction (XRD),scanning electron microscope (SEM),UV-Vis diffuse reflection spectroscope (UV-Vis/DRS),N2 adsorption-desorption isothermal.The molar ratios of Bi(NO3)3·5H2O and glycine (Bi:G),and hydrothermal time played important roles in the preparation process,which affected the morphology,structure,and light absorption properties of BiOI.Rhodamine-B and salicylic acid were used as the goal pollutants to evaluate the simulated sunlight catalytic properties of BiOI prepared with or without glycine.The BiOI prepared with Bi:G=1:2 and hydrothermal time of 12 h exhibited the excellent degradation activity.After 40 min irradiation,Rhodamine-B and salicylic acid degradation rate constant by the glycine assisted synthesis of BiOI reached 0.0232 and 0.0223 minl,respectively.However,the photocataytic degradation rate constant of BiOI prepared without glycine was only 0.0111 and 0.0143 min-1.Compared with BiOI prepared without glycine,the degradation activity improved sharply.The enhanced photocatalytic activity was mainly ascribed to regular morphology and big BET surface area of the BiOI prepared with the addition of glycine.
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