研究论文
张星,吴平霄,吴锦华,党志.掺杂过渡金属的TiO2/累托石复合材料的制备及其光催化性能研究[J].环境科学学报,2014,34(3):612-619
掺杂过渡金属的TiO2/累托石复合材料的制备及其光催化性能研究
- Preparation and photocatalytic property of transition metal-doped TiO2/rectorite composite
- 基金项目：国家自然科学基金（No.41073058，40973075）；广东省自然科学基金团队项目（No.9351064101000001）；高等学校博士学科点专项科研基金（No.20100172110028）
- 作者
- 单位
- 张星
- 华南理工大学环境与能源学院, 工业聚集区污染控制与生态修复教育部重点实验室, 污染控制与生态修复广东省教育厅重点实验室, 广州 510006
- 吴平霄
- 华南理工大学环境与能源学院, 工业聚集区污染控制与生态修复教育部重点实验室, 污染控制与生态修复广东省教育厅重点实验室, 广州 510006
- 吴锦华
- 华南理工大学环境与能源学院, 工业聚集区污染控制与生态修复教育部重点实验室, 污染控制与生态修复广东省教育厅重点实验室, 广州 510006
- 党志
- 华南理工大学环境与能源学院, 工业聚集区污染控制与生态修复教育部重点实验室, 污染控制与生态修复广东省教育厅重点实验室, 广州 510006
- 摘要：以累托石为载体，钛酸四丁酯和硝酸铜为原料，采用溶胶-凝胶法制备出了掺杂过渡金属铜的TiO2/累托石复合光催化材料，并对其进行了X射线衍射（XRD）和红外光谱（FT-IR）的表征.同时考察了复合材料在紫外光照下对对氯苯酚的光催化活性，研究了铜掺杂量和煅烧温度等因素对复合材料光催化活性的影响，探讨了过渡金属掺杂改性TiO2的机理及对氯苯酚的光催化降解机理.实验结果表明：在制备复合材料的过程中，累托石的层状结构遭到一定程度的破坏；复合材料中的TiO2主要是以大部分的锐钛矿型和小部分的金红石型的混合形态存在；负载累托石后复合材料的吸附性能明显增加，掺杂铜的TiO2/累托石复合材料的光催化活性要高于未掺杂铜的TiO2/累托石复合材料，并且当掺铜量为0.5%（质量分数），煅烧温度为500 ℃时，复合材料对对氯苯酚的光催化去除率达到最大；苯醌类物质可能是对氯苯酚光降解的中间产物.
- Abstract：Transition metal Cu-doped TiO2/rectorite composite photocatalyst was prepared through sol-gel method by using rectorite as supporter, Ti(OBu)4 as titanium precursor and Cu(NO3)2 as copper precursor. Characterization of the prepared composite was done by X-ray diffraction (XRD) and Fourier transform infrared (FT-IR) spectroscopy. Photocatalytic activity of the prepared composite was evaluated by degradation of p-chlorophenol (4-CP) under UV light irradiation and the effects of Cu doping concentration and calcination temperature on its photocatalytic activity were studied. The mechanism of transition metal doped TiO2 was discussed as well as the mechanism of photocatalytic degradation of p-chlorophenol. The results indicated that the layered structure of rectorite was destroyed to a certain extent during the preparation process. TiO2 in the prepared composite existed in a mixed phase, including anatase and a small amount of rutile. The prepared composite with loading rectorite showed a stronger adsorption capability than that without loading rectorite. The prepared composite doped with Cu showed higher photocatalytic activities than that undoped with Cu. Moreover, when doping with 0.5% of Cu and calcinating at 500 ℃, the prepared composite photocatalyst exhibited the highest photocatalytic activity for removal of 4-CP in aqueous solution under UV light irradiation. Benzoquinone might be the intermediate product during the photocatalytic degradation of p-chlorophenol.
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