光量热法初探甲基橙光催化原位降解过程

doi:10.7503/cjcu20140176

高等学校化学学报 ›› 2014, Vol. 35 ›› Issue (7): 1480.doi: 10.7503/cjcu20140176

光量热法初探甲基橙光催化原位降解过程

李星星¹, 黄在银^1,²(), 范高超¹, 吴烨楠¹, 谭学才¹

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

收稿日期:2014-03-05 出版日期:2014-07-10 发布日期:2014-05-19
作者简介:联系人简介: 黄在银, 男, 教授, 主要从事纳米材料物理化学研究. E-mail: huangzaiyin@163.com
基金资助:
国家自然科学基金(批准号: 20963001, 21273050)资助

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

LI Xingxing¹, HUANG Zaiyin^1,^2,^*(), FAN Gaochao¹, WU Yenan¹, TAN Xuecai¹

1. College of Chemistry and Chemical Engineering
2. Key Laboratory of Forest Chemistry and Engineering, Guangxi University for Nationalities, Nanning 530006, China

Received:2014-03-05 Online:2014-07-10 Published:2014-05-19
Contact: HUANG Zaiyin E-mail:huangzaiyin@163.com
Supported by:
Supported by the National Natural Science Foundation of China(Nos.20963001, 21273050)

摘要/Abstract

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.

关键词: 可见光催化, Ag@AgCl, 光量热法, 甲基橙, 光降解机理

Abstract:

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.

Key words: Photocatalysis under visible-light, Ag@AgCl, Photocalorimetry, Methyl orange, Photodegradation mechanism(Ed.: S, Z, M)

中图分类号:

O645

TrendMD:

李星星, 黄在银, 范高超, 吴烨楠, 谭学才. 光量热法初探甲基橙光催化原位降解过程. 高等学校化学学报, 2014, 35(7): 1480.

LI Xingxing, HUANG Zaiyin, FAN Gaochao, WU Yenan, TAN Xuecai. Primary Photocalorimetry Investigation of the In-situ Photocatalytic Process of Methyl Orange Degradation^†. Chem. J. Chinese Universities, 2014, 35(7): 1480.

图/表 3

Fig.1 Novel photoreaction-microcalorimetric system

Fig.2 XRD pattern(A) and SEM image(B) of Ag@AgCl a. XRD criterion pattern of AgCl; b. XRD pattern of as-prepared Ag@AgCl. Inset in (A): diffraction peak of Ag NPs.

Fig.3 Heat flow curves of photocatalysis of MO over Ag@AgCl under 25 ℃ during 0—15000 s(A) and 0—3000 s(B), UV-Vis spectrum during MO degradation with Ag@AgCl as photocatalyst(C) and MO degradation curves by using AgCl, Ag@AgCl as photocatalysts under 55 W LED irradiation(D) Insets in (B): (1) The initial solution; (2) the solution after reaction for 15 min.

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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^†

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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†

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