Ag3PO4/AgI光催化剂的制备及降解2-氨基-4-乙酰氨基苯甲醚机理

doi:10.16085/j.issn.1000-6613.2020-1789

摘要/Abstract

摘要：

研究了Ag₃PO₄复合棒状AgI光催化剂的制备及降解2-氨基-4-乙酰氨基苯甲醚（AMA）的性能和机理，利用X射线衍射（XRD）、扫描电镜（SEM）、紫外可见漫反射（UV-Vis）、光电子能谱（XPS）等方法对合成样品的物相组成和形貌结构进行了表征。通过可见光催化降解AMA来评价光催化剂的催化性能。实验结果显示，Ag₃PO₄/AgI复合光催化剂比Ag₃PO₄和AgI单体具有更强的光催化氧化与还原能力，其中以I和P的比例为1∶5时效果最佳，且在五次循环使用之后仍有较好的光催化活性。自由基捕获实验证明光催化过程中光生空穴（h⁺）是主要的活性物种。投加量为30mg、光照时间60min的条件下可将AMA几乎完全去除。本文研究结果为构筑新型可见光光催化剂提供了新视角，为促进光催化降解有机污染物提供了新途径。

关键词: 催化, 降解, 纳米材料, 磷酸银, 碘化银

Abstract:

In the present work, Ag₃PO₄/AgI nanocomposite was successfully synthesized and tested through the degradation of 2-amino-4-acetamidoanisole (AMA) as typical organic pollutant. X-ray diffraction (XRD) along with scanning electron microscope (SEM), ultraviolet visible spectrophotometer, and X-ray photoelectron spectroscopy (XPS) was employed to characterize the synthesized samples. The as-prepared nanocomposite showed great photocatalytic activity compared to single semiconductors. The semiconductor heterojunction led to effective separation of electron-hole pair, enhancing the photodegradation of 2-amino-4-acetamidoanisole (AMA). The addition of 30mg photocatalyst almost resulted in complete removal of AMA during 60 minute-irradiation. Free radical capture experiments proved that photo-generated holes (h⁺) were the main active species in the photocatalytic process. The nanocomposite showed high recyclability ability after 5 cycles of experiment. The findings of this study provided a new perspective for the fabrication of visible light photocatalysts and a new way to improve the photocatalytic degradation of organic pollutants.

Key words: catalysis, degradation, nanomaterials, silver phosphate, silver iodide

中图分类号:

X703

陈厚望, 刘宏, 张鹏, 杨留留, 陈猛. Ag₃PO₄/AgI光催化剂的制备及降解2-氨基-4-乙酰氨基苯甲醚机理[J]. 化工进展, 2021, 40(8): 4268-4277.

CHEN Houwang, LIU Hong, ZHANG Peng, YANG Liuliu, CHEN Meng. Preparation of Ag₃PO₄/AgI photocatalyst and its mechanism of AMA degradation[J]. Chemical Industry and Engineering Progress, 2021, 40(8): 4268-4277.

图/表 14

图1 Ag3PO4、AgI和Ag3PO4/AgI的XRD图谱

图2 Ag3PO4[(a)、(b)]和Ag3PO4/AgI[(c)、(d)]复合材料的SEM图

图3 Ag3PO4、AgI和Ag3PO4/AgI复合材料的红外光谱

图4 Ag3PO4/AgI的XPS图谱

图5 Ag3PO4/AgI复合材料的光吸收图

图6 材料不同比例对AMA降解效率的影响

图7 不同AMA初始浓度对AMA降解率的影响

图8 不同催化剂投加量对AMA降解率的影响

图9 pH对光催化降解AMA的影响

图10 循环实验图

图11 异丙醇、对苯醌和草酸铵对AMA降解效率的影响

图12 Ag3PO4/AgI光催化降解AMA的机理示意图

图13 Ag3PO4/AgI光催化降解AMA的质谱图

图14 Ag3PO4/AgI光催化降解AMA的可能降解途径

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Ag₃PO₄/AgI光催化剂的制备及降解2-氨基-4-乙酰氨基苯甲醚机理

Preparation of Ag₃PO₄/AgI photocatalyst and its mechanism of AMA degradation

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