多溴联苯醚（PBDEs）在生态环境中是普遍存在的并已证实具有潜在的毒性，因此PBDEs引起了环境化学领域的广泛关注。光催化技术具有可利用太阳能、反应选择性高且反应条件温和等优点，其在降解PBDEs这类污染物方面具有独特的优势。近年来光催化在降解含卤有机污染物的研究中取得长足进展。本文就多卤代芳烃类化合物中最为典型的PBDEs的光催化还原研究现状进行介绍，并着重阐述TiO2催化剂对PBDEs的光催化还原脱溴反应的基本过程、提高光催化还原效率的途径以及光催化还原脱溴机理等。除此之外，本文也对PBDEs未来光催化还原脱溴的前景进行了简单的展望。
Global extensive concerns have been caused by polybrominated diphenyl ethers (PBDEs),because of their universal existence and potential toxicity in ecological environment. The use of solar energy, high selectivity and the mild reaction conditions make photocatalysis become a promising technique for the removal of these pollutants. Recently, great progress has been made in photocatalytic degradation of polyhalogenated organic pollutions. This review mainly focuses on TiO2-based photocatalytic reduction of PBDEs, which are typical polyhalogenated aromatic hydrocarbons. The ways to improve photocatalytic reductive efficiency and the reaction mechanism have been described. In addition, the promising future of PBDEs photocatalytic reductive debromination is prospected.
Contents
1 Introduction
2 An overview of PBDEs
3 Photocatalytic reductive debromination of PBDEs
3.1 Photocatalytic reductive debromination based on TiO2
3.2 Photoreductive debromination based on halogen bonding under visible light
4 Proton-coupled electron transfer based on photocatalytic reductive process of PBDEs
5 Conclusion
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