光量热法初探甲基橙光催化原位降解过程  

Primary Photocalorimetry Investigation of the In-situ Photocatalytic Process of Methyl Orange Degradation

作　　者：李星星[1] 黄在银[1,2] 范高超[1] 吴烨楠 谭学才[1] 

机构地区：[1]广西民族大学化学化工学院 [2]广西林产化学与工程重点实验室,南宁530006

出　　处：《高等学校化学学报》2014年第7期1480-1483,共4页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金(批准号:20963001,21273050)资助~~

摘　　要：通过在室温下还原前驱体制备了Ag@AgCl催化剂,并利用X射线粉末衍射仪(XRD)和场发射扫描电子显微镜(FE-SEM)对产物进行表征.设计了新型光化学-微热量系统,用该系统获得了Ag@AgCl光催化降解甲基橙实时、在线的热力学和动力学瞬态信息.研究结果表明,该降解过程首先经历吸热再迅速进入放热阶段,最后曲线恒定于一个长的放热平台,计算得到ab,ac和ad段的热效应分别为-0.2609,2.5845和40.7289 J,放热平台cd的平均速率为2.581 mJ/s,并详细探讨了该过程的微观降解机制.Ag@ AgCl photocatalyst was prepared by reduction of AgCl precursor at room temperature, and characterised by X-ray powder diffraction（XRD） and field-emission scanning electron microscope（FE-SEM）. process went through an initial endothermic reaction and followed by an exothermic stage which finally kept a constant exothermic rate for at least 4 h. The heat effects of ab, ac, and ad stages were -0. 2609, 2. 5845 and 40. 7289 J, respectively. Meanwhile, the steady rate of exothermic platform, the stage of cd, is 2. 581 mJ/s. The microscopic mechanism of photodegradation was discussed in detail.

关 键 词：可见光催化 Ag@AgCl 光量热法 甲基橙 光降解机理 

分 类 号：O645[理学—物理化学]