g-C_(3)N_(4)/Ag基二元复合光催化剂降解环境污染物的研究进展

Research Progress on g-C_(3)N_(4)/Ag-Based Binary Composite Photocatalysts for Degradation of Environmental Pollutants

光催化技术在太阳能资源利用方面呈现出良好的应用前景,已受到世界各国的广泛关注。g-C_(3)N_(4)是一种二维结构的非金属聚合物型半导体材料,具有合成简单、成本低、化学性质稳定、无毒等特点,在环境修复和能量转化方面应用潜力较大。但g-C_(3)N_(4)存在对可见光吸收能力差、比表面积小和光生载流子复合速率高等缺点,限制了其实际应用。构筑异质结光催化剂是提高光催化效率的有效途径之一。基于Ag基材料的特点,前人对g-C_(3)N_(4)/Ag基二元复合光催化剂进行了大量研究,并取得显著成果。本文总结了近年来AgX(X=Cl,Br,I)/g-C3N4、Ag3PO4/g-C3N4、Ag_(2) CO_(3)/g-C_(3)N_(4)、Ag3 VO4/g-C_(3)N_(4)、Ag_(2) CrO4/g-C_(3)N_(4)、Ag_(2) O/g-C_(3)N_(4)和Ag_(2) MoO4/g-C_(3)N_(4)复合光催化剂降解环境污染物的研究进展,并评述了g-C_(3)N_(4)/Ag基二元复合光催化剂目前面临的主要挑战,展望了其未来发展趋势。

Photocatalysis technology shows a good application prospect in the utilization of solar energy resource and has attracted worldwide attention.g-C_(3)N_(4) is a two-dimensional polymeric metal-free semiconductor material with the characteristics of facile synthesis,low cost,high chemical stability and non-toxicity,which has great potential in environmental remediation and energy conversion.However,g-C_(3)N_(4) has the drawbacks of poor visible light absorption capacity,low specific surface area and high recombination rate of photogenerated charge carriers,which limits its practical application.Constructing heterojunction photocatalyst has become one of effective pathways for boosting photocatalytic efficiency.Based on the inherent merits of Ag-based materials,a lot of researches have been carried out on g-C_(3)N_(4)/Ag-based binary photocatalysts and prominent results have been achieved.Recent advances on AgX(X=Cl,Br,I)/g-C3N4,Ag3PO4/g-C3N4,Ag_(2) CO_(3)/g-C_(3)N_(4),Ag3 VO4/g-C_(3)N_(4),Ag_(2) CrO4/g-C_(3)N_(4),Ag_(2) O/g-C_(3)N_(4) and Ag_(2) MoO4/g-C_(3)N_(4) composite photocatalysts for the degradation of environmental pollutants were summarized.The major challenges of g-C_(3)N_(4)/Ag-based binary composite photocatalysts were reviewed and the future development trends were also forecast.