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40.7289J,放热平台cd的平均速率为2.581mJ/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.