多孔矿物载体对纳米TiO_2复合材料光催化脱色性能的影响

Effect of the Porous Minerals on Photodecoloration Property of the Nano Titanium Dioxide Composite Materials

以多孔矿物沸石、硅藻土、高岭石和坡缕石为载体,采用TiCl4水解法制备了纳米TiO2/多孔矿物复合光催化材料。采用XRD分析了材料的成分和结构,采用甲基橙染料废水评价并对比了材料的光催化性能。研究表明,复合材料中纳米TiO2均为锐钛矿结构,且矿物载体结构未被破坏。由于沸石、硅藻土和坡缕石具有很好的吸附性能,制备的材料在光照初期即对甲基橙染料废水表现出很好的脱色效果。高岭石由于吸附性能相对较弱,导致材料对甲基橙染料废水的脱色效果不佳。

Nano TiO2/porous mineral composite photocatalysts are prepared by TiCl4 hydrolysis method using carriers of zeolite, diatomite, kaolinite and palygorskite as raw materizals. The structure of the materials is researched by XRD. The photoeatalysis of the materials is estimated by the methyl orange（MO） wastewater. The results show that all the composite photocatalysts are composed of anatase phase with no rutile phase and the structure of the mineral is unspoilt. The decoloration rate of MO wastewater dealt by zeolite, diaomite and palygorskite loading nano TiO2 composite materials promptly rises in the beginning of illumination due to the excellent adsorption capability of the porous minerals. The decoloration rate of MO wastewater slowly decreases as the illumination time ascends because of the interaction of adsorption, desorption and photocatalysis between the composite photocatalyst and MO dye. The decoloration rate of MO wastewater rises as the ascending of the illumination time due to the poor absorption effect of kaolinite and the photocatalysis of nano TiO2.