Li Shijie, Zhang Lisha, Wang Huanli, Chen Zhigang, Hu Junqing, Xu Kaibing, Liu Jianshe
College of Environmental Science and Engineering, Donghua University, Shanghai 201620, People's Republic of China.
State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai 201620, People's Republic of China.
Sci Rep. 2014 Feb 5;4:3978. doi: 10.1038/srep03978.
Traditional nanosized photocatalysts usually have high photocatalytic activity but can not be efficiently recycled. Film-shaped photocatalysts on the substrates can be easily recycled, but they have low surface area and/or high production cost. To solve these problems, we report on the design and preparation of efficient and easily recyclable macroscale photocatalysts with nanostructure by using Ta3N5 as a model semiconductor. Ta3N5-Pt nonwoven cloth has been prepared by an electrospinning-calcination-nitridation-wet impregnation method, and it is composed of Ta3N5 fibers with diameter of 150-200 nm and hierarchical pores. Furthermore, these fibers are constructed from Ta3N5 nanoparticles with diameter of ~25 nm which are decorated with Pt nanoparticles with diameter of ~2.5 nm. Importantly, Ta3N5-Pt cloth can be used as an efficient and easily recyclable macroscale photocatalyst with wide visible-light response, for the degradation of methylene blue and parachlorophenol, probably resulting in a very promising application as "photocatalyst dam" for the polluted river.
传统的纳米级光催化剂通常具有高光催化活性，但无法有效回收利用。负载在基底上的薄膜状光催化剂易于回收，但表面积小和/或生产成本高。为了解决这些问题，我们报道了以Ta3N5作为模型半导体，设计并制备具有纳米结构的高效且易于回收的宏观尺度光催化剂。通过静电纺丝-煅烧-氮化-湿浸渍法制备了Ta3N5-Pt无纺布，它由直径为150-200 nm且具有分级孔隙的Ta3N5纤维组成。此外，这些纤维由直径约为25 nm的Ta3N5纳米颗粒构成，其上装饰有直径约为2.5 nm的Pt纳米颗粒。重要的是，Ta3N5-Pt布可作为一种高效且易于回收的宏观尺度光催化剂，具有宽可见光响应，用于降解亚甲基蓝和对氯苯酚，有望作为受污染河流的“光催化剂坝”得到非常有前景的应用。
