Chemical Industry and Engineering Progress ›› 2021, Vol. 40 ›› Issue (8): 4268-4277.DOI: 10.16085/j.issn.1000-6613.2020-1789

• Industrial catalysis • Previous Articles     Next Articles

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

CHEN Houwang(), LIU Hong(), ZHANG Peng, YANG Liuliu, CHEN Meng   

  1. School of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou 215009, Jiangsu, China
  • Received:2020-09-04 Online:2021-08-12 Published:2021-08-05
  • Contact: LIU Hong

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

陈厚望(), 刘宏(), 张鹏, 杨留留, 陈猛   

  1. 苏州科技大学环境科学与工程学院,江苏 苏州 215009
  • 通讯作者: 刘宏
  • 作者简介:陈厚望(1994—),男,硕士研究生,研究方向为建筑与土木工程(市政方向)。E-mail:houwangchan@163.com
  • 基金资助:
    国家自然科学基金青年基金(51708381);江苏省自然科学基金项目面上项目(BK20181466);江苏省苏州市科技局民生科技项目(SS2019028);苏州市生态环保局环保项目(B201903)

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

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

CLC Number: 

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