Li Bicai, Yuan Donghai, Gao Caiyun, Zhang Hong, Li Zhicheng
School of Materials Science and Engineering, Central South University, Changsha, 410083, China.
School of Materials and Chemical Engineering, Hunan City University, Yiyang, 413000, China.
Environ Sci Pollut Res Int. 2022 Dec;29(56):85510-85524. doi: 10.1007/s11356-022-21758-x. Epub 2022 Jul 7.
In order to investigate the photocatalytic degradation of dissolved organic matter (DOM) in landfill leachate, TiO/ZnO heterostructural composite powders were fabricated combining with hydrothermal synthesis and solid-state reaction method. The prepared TiO/ZnO composite powders consist of anatase TiO nanoparticles distributing on the surface of wurtzite ZnO particles. The optical band gap of TiO/ZnO powder is less than that of pure ZnO or TiO powder. TiO/ZnO catalyzers show high ultraviolet-degradation efficiency for methylene blue and dissolved organic matter. The degradation rate of TiO/ZnO powder for fulvic acid-like substances in landfill leachate is 2.99 times that of pure ZnO powder, and is 1.30 times that of pure TiO powder. The degradation of fulvic acid-like substances by TiO/ZnO photocatalyst reduced some molecular weight of benzene ring structure substances in leachate. The effective separation of electron and hole in heterostructural TiO/ZnO photocatalyst is the main reason for its high photocatalytic degradation efficiency of DOM in landfill leachate.
为了研究垃圾渗滤液中溶解有机物（DOM）的光催化降解，采用水热合成法和固相反应法制备了TiO/ZnO异质结构复合粉末。制备的TiO/ZnO复合粉末由分布在纤锌矿型ZnO颗粒表面的锐钛矿型TiO纳米颗粒组成。TiO/ZnO粉末的光学带隙小于纯ZnO或TiO粉末。TiO/ZnO催化剂对亚甲基蓝和溶解有机物显示出高的紫外降解效率。TiO/ZnO粉末对垃圾渗滤液中类富里酸物质的降解率是纯ZnO粉末的2.99倍，是纯TiO粉末的1.30倍。TiO/ZnO光催化剂对类富里酸物质的降解降低了渗滤液中一些苯环结构物质的分子量。异质结构TiO/ZnO光催化剂中电子和空穴的有效分离是其对垃圾渗滤液中DOM具有高光催化降解效率的主要原因。
