{110}晶面取向Ag<sub>3</sub>PO<sub>4</sub>多面体的水热制备及可见光催化活性

引用本文: 刘春梅, 张国英, 张欣, 许艳艳, 高东昭. {110}晶面取向Ag₃PO₄多面体的水热制备及可见光催化活性[J]. 物理化学学报, 2015, 31(10): 1939-1948. doi: 10.3866/PKU.WHXB201508251 shu

Citation: LIU Chun-Mei, ZHANG Guo-Ying, ZHANG Xin, XU Yan-Yan, GAO Dong-Zhao. Hydrothermal Synthesis of Ag₃PO₄ Polyhedrons with Oriented {110} Facets and Visible-Light-Driven Photocatalytic Activity[J]. Acta Physico-Chimica Sinica, 2015, 31(10): 1939-1948. doi: 10.3866/PKU.WHXB201508251 shu

{110}晶面取向Ag₃PO₄多面体的水热制备及可见光催化活性

基金项目:
国家自然科学基金(21303122) (21303122)

天津市高等学校创新团队培养计划(TD12-5038)资助项目 (TD12-5038)

摘要:

采用简易水热法在聚乙二醇-6000 (PEG-6000)辅助下合成了Ag₃PO₄多面体. 系统考察了水热反应温度、时间及PEG-6000用量对产物形貌和结构的影响. 通过X射线衍射(XRD), 扫描电子显微镜(SEM), 紫外-可见漫反射光谱(UV-Vis DRS)和荧光(PL)光谱等测试手段对光催化剂进行了表征. 结果表明, 适宜的水热温度及PEG-6000用量是制备具有{110}活性晶面取向Ag₃PO₄多面体的必要条件, 该多面体通过纳米颗粒的Ostwald熟化效应生长而成. 可见光催化降解罗丹明B (RhB)的实验表明, 该Ag₃PO₄多面体活性明显优于其它水热条件下所制备的非{110}取向晶面样品和离子交换法所得纳米颗粒, 其降解反应速率常数(k)为离子交换法所得Ag₃PO₄纳米颗粒的8.3倍. 总有机碳含量(TOC)及循环实验证明, 该Ag₃PO₄多面体可以有效地矿化RhB并保持较好的循环稳定性. 活性自由基捕获实验表明, 空穴(h⁺)和羟基自由基(·OH)是光催化氧化的主要活性物种. 结合活性物种的氧化还原电位以及Ag₃PO₄的能带结构分析, 提出了催化反应界面光生电子-空穴(e^--h⁺)对的分离及转移机制.

关键词:

English

Hydrothermal Synthesis of Ag₃PO₄ Polyhedrons with Oriented {110} Facets and Visible-Light-Driven Photocatalytic Activity

1.
Tianjin Key Laboratory of Structure and Performance for Functional Molecules, Key Laboratory of Inorganic-Organic Hybrid Functional Material Chemistry, Ministry of Education, College of Chemistry, Tianjin Normal University, Tianjin 300387, P. R. China
Received Date: 06 July 2015
Available Online: 10 October 2015
Fund Project:
国家自然科学基金(21303122)

天津市高等学校创新团队培养计划(TD12-5038)资助项目

Abstract:

Ag₃PO₄ polyhedrons were synthesized by a facile hydrothermal route using polyethylene glycol-6000 (PEG-6000). The effects of hydrothermal temperature, reaction time, and PEG-6000 dosage on the morphologies and structures of the products were systematically investigated. The photocatalysts were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), ultraviolet-visible diffuse reflectance spectra (UV-Vis DRS), and photoluminescence (PL) spectra. The hydrothermal temperature and the PEG dosage are key factors in the production of Ag₃PO₄ polyhedrons with oriented {110} facets. The Ag₃PO₄ polyhedrons evolve via Ostwald ripening, and exhibit superior visible-light photocatalytic degradation of Rhodamine B (RhB) relative to Ag₃PO₄ samples without oriented {110} facets and Ag₃PO₄ nanoparticles prepared by anion-exchange. The reaction rate constant of the Ag₃PO₄ polyhedrons was 8.3 times that of the Ag₃PO₄ nanoparticles. Total organic carbon (TOC) analysis and cycling experiments revealed that the polyhedrons have better mineralization efficiency and exhibit od circulation runs. Holes (h+) and hydroxyl radicals (·OH) are confirmed to be the dominant active species in the presence of radical scavengers and in N₂-saturated solution. Given the redox potential of the active species and the band structure of Ag₃PO₄ polyhedron, the separation and migration mechanism of photogenerated electron-hole (e^--h⁺) pairs at the photocatalytic interface was proposed.

Key words:

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沈阳化工大学材料科学与工程学院沈阳 110142

{110}晶面取向Ag₃PO₄多面体的水热制备及可见光催化活性

English

Hydrothermal Synthesis of Ag₃PO₄ Polyhedrons with Oriented {110} Facets and Visible-Light-Driven Photocatalytic Activity

CCS Chemistry：嵌段共聚物自组装成 “三明治”二维有机材料，实现纳米级压力传感功能

CCS Chemistry：颜徐州、鲍哲南：你的皮肤可能是一片SPMs

CCS Chemistry：工作高效不疲劳，只须让催化剂动起来

CCS Chemistry：静电组装导向聚合- 聚电解质纳米凝胶量化制备新策略

CCS Chemistry：金黄色葡萄球菌醛基脱氢酶是如何识别特异性底物的？

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通讯作者: 陈斌, bchen63@163.com

中国化学会秘书处

{110}晶面取向Ag3PO4多面体的水热制备及可见光催化活性

English

Hydrothermal Synthesis of Ag3PO4 Polyhedrons with Oriented {110} Facets and Visible-Light-Driven Photocatalytic Activity

CCS Chemistry：嵌段共聚物自组装成 “三明治”二维有机材料，实现纳米级压力传感功能

CCS Chemistry：颜徐州、鲍哲南： 你的皮肤可能是一片SPMs

CCS Chemistry：工作高效不疲劳，只须让催化剂动起来

CCS Chemistry：静电组装导向聚合- 聚电解质纳米凝胶量化制备新策略

CCS Chemistry：金黄色葡萄球菌醛基脱氢酶是如何识别特异性底物的？

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