硫酸盐修饰的含钛高炉渣光催化还原Cr(Ⅵ)  

Photocatalytic Reduction of Cr(Ⅵ) by Sulfate Modified Titanium-Bearing Blast Furnace Slag

作　　者：薛向欣[1] 雷雪飞[1] 杨合[1] 段培宁[1] 

机构地区：[1]东北大学材料与冶金学院,辽宁沈阳110004

出　　处：《东北大学学报（自然科学版）》2009年第2期217-220,共4页Journal of Northeastern University(Natural Science)

基　　金：国家自然科学基金资助项目(50274025);教育部科学技术研究重大项目(307009);国家重点基础研究发展计划项目(2007CB613504)

摘　　要：采用高能球磨法,在300℃煅烧2 h合成了具有钙钛矿型的硫酸盐修饰的含钛高炉渣(sulfate-modified titanium-bearing blast furnace slag,STBBFS)催化剂.用X射线衍射、扫描电子显微镜和紫外-可见漫反射分析对硫酸盐修饰的含钛高炉渣催化剂进行了表征,确定其具有钙钛矿型;粉体的颗粒形态均为不规则形状,平均粒径为1.5μm左右;在紫外区域具有很强的光吸收能力.由六价铬的还原率来评价STBBFS催化剂的光催化活性,结果表明:与市售TiO2相比,钙钛矿型的STBBFS催化剂具有较高的光催化活性,500 W中压汞灯照射4 h,可将质量浓度为20 mg/L的六价铬废水完全降解.Perovskite-type STBBFS （sulfate-modified titanium-bearing blast furnace slag） photocatalyst was prepared by the high energy ball milling process and calcination at 300 ℃ for 2 h. The powdered catalyst was characterized by XRD, UV-vis absorption spectroscopy and SEM. It was found that the shapes of powder particles are irregular with an average particle size about 1.5 μm, and the catalyst has high light absorbability in UV range. Its photocatalytic activity was checked through the reduction rate of Cr （Ⅵ）. The results showed that the perovskite-type photocatalyst STBBFS presents a higher catalytic activity in comparison to the commercial TiO2 catalysts, which can fully degrade the waste water where the Cr （Ⅵ） concentration is up to 20 mg/L, under the 4 h irradiation by a 500 W MV mercury lamp.

关 键 词：硫酸盐修饰 含钛高炉渣 光催化剂 钙钛矿 六价铬 吸附 光催化还原 

分 类 号：TQ032.41[化学工程]