光催化降解土壤中多环芳烃
Photocatalytic Degradation of Polycyclic Aromatic Hydrocarbon in Soil
多环芳烃(PAHs)是一类广泛分布于土壤中的持久性有机污染物,其化学结构稳定,具有高疏水性、难降解性和三致毒性,多产生于交通运输、工业生产、垃圾焚烧等人为活动中。近年来,日益严峻的PAHs污染给土壤生态、食品安全和民众健康带来严重威胁。因此,对土壤PAHs污染的治理具有重要意义且亟待解决。在众多PAHs处理技术中,光催化技术凭借能耗低、操作简便、环境友好等优势,受到了研究者们的广泛关注。本文概述了PAHs的光催化降解机理与途径,综述了光催化修复土壤PAHs领域的研究进展,讨论了不同环境因素对催化剂降解效果的影响,并总结了当前光催化技术应用于土壤PAHs污染修复所面临的挑战。
As a class of persistent organic pollutants, polycyclic aromatic hydrocarbons(PAHs) have been widely distributed in soil, which is highly stable, hydrophobic, cytotoxic and difficult to degrade. The PAHs are commonly produced from transportation, industrial production and waste incineration. In recent years, the increasingly serious pollution of PAHs in soil has become a great threat to soil ecology, food safety and public health. Hence, the treatment of PAHs contaminated soil is of great importance and urgently needed. Among numerous strategies for PAHs degradation, photocatalytic technology has attracted extensive attention due to its low energy consumption, facile operation and environmental friendliness. In this paper, the photocatalytic degradation mechanism and pathway of PAHs are overviewed, the current state of knowledge concerning photocatalytic remediation of PAHs contaminated soils is reviewed, and the impacts of different environmental factors on the degradation efficiency of photocatalysts are discussed. Furthermore, we summarize the challenges to apply photocatalytic technology in the field of PAHs contaminated soil remediation.
1 Introduction
2 Photocatalytic mechanism of PAHs degradation
3 Applications of photocatalysts in remediation of PAHs in soil
3.1 TiO2
3.2 Iron-based materials
3.3 g-C3N4
4 The main environmental factors affecting degradation of PAHs in soil
4.1 Light irradiation
4.2 Soil thickness
4.3 Soil moisture content
4.4 Soil pH
4.5 Solid phase of soil
5 Conclusion and outlook
多环芳烃 / 光催化 / 土壤修复 / 降解机理 / 影响因素
polycyclic aromatic hydrocarbons / photocatalysis / soil remediation / degradation mechanism / influence factor
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国家自然科学基金项目(51672047)
福建省自然科学基金面上项目(2019J01648)
福建省教育厅青年基金(JAT190055)
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