蒙脱石基TiO2光催化材料制备表征及应用研究

Research on Preparation Characterization and Application of Photocatalytic Material of Nanometer TiO_2/Montmorillonite

蒙脱石作为基材,采用溶胶-凝胶法和改型、改性制备得到TiO2/钙基蒙脱石,TiO2/钠基蒙脱石及TiO2/有机蒙脱石3种复合光催化材料。采用XRD、FT-IR、AFM、SEM等测试技术对材料进行表征分析,结果表明:复合光催化材料中TiO2均以锐钛矿相存在,TiO2晶体平均粒径为12—27 nm。钙基蒙脱石表面纳米TiO2晶体以单体结晶状尖端突出向上发育;钠基蒙脱石表面纳米TiO2以连生体结晶状形成晶体薄膜;有机蒙脱石表面纳米TiO2晶体颗粒则以团聚状分布。当用于降解偶氮染料废水的条件为:废水浓度400 mg/L,催化剂浓度3 g/L,紫外光催化反应60 min时,3种光催化材料对偶氮染料废水的降解脱色率分别为95.87%,96.28%和71.07%。

Materials of composite photocatalyst were prepared which TiO2/Ca-montmorillonite,TiO2/Na-montmorillonite and TiO2/organic-montmorillonite by the sol-gel and modified of montmorillonite as a substrate.Test techniques of XRD,FT-IR、AFM、SEM were adopted to characterized the properties of the materials.The test results showed that TiO2 presented at all of anatase,particle size of crystal TiO2 was ranged from 12 nm to 27 nm.Nanometer TiO2 crystal on the surface of Ca-montmorillonite growing upward.At top end of mono-crystal;a crystal film formed on the surface of Na-montmorillonite which growth at multcrystal together;Nanometer TiO2 crystal on the surface of the organic montmorillonite distributed at reunite state.The rate of decolorization of photocatalysts for azo dye wastewater were respectively 95.87,96.28 and 71.07 percent as 400 mg/L for wastewater concentration,3 g/L dosages of photocatalyst,photocatalysis 60 min in UV-light.