CAJ | 학술논문

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.
통과재실온하환원전구체제비료 Ag@ AgCl 최화제,병이용 X 사선분말연사의(XRD)화장발사소묘전자현미경(FE-SEM)대산물진행표정.설계료신형광화학-미열량계통,용해계통획득료 Ag@ AgCl 광최화강해갑기등실시、재선적열역학화동역학순태신식.연구결과표명,해강해과정수선경력흡열재신속진입방열계단,최후곡선항정우일개장적방열평태,계산득도 ab, ac 화 ad 단적열효응분별위-0.2609,2.5845화40.7289 J,방열평태 cd 적평균속솔위2.581 mJ/ s,병상세탐토료해과정적미관강해궤제.
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). A novel photoreaction-microcalorimetry was designed and employed to obtain the on-line thermodynamic and kinetic informations of photocatalysis of methyl orange over Ag@ AgCl. The results showed that the degradation 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.