采用高能球磨法,添加不同比例硫酸,在400℃煅烧2h合成了具有钙铁矿型的硫酸掺杂的含钛高炉渣催化荆(sulfuric acid-modified titanium-bearingblast furnace slag,STBBFS).用X射线衍射(XRD)、傅里叶变换红外光谱(FTIR)、扫描电子显微镜(SEM)、紫外可见漫反射光谱(UV-vis)和热重(TG)分析对STBBFS催化剂进行了表征,确定其具有钙铁矿结构;粉体的颗粒形态均为不规则块状,400℃煅烧后出现了团聚现象;在紫外区域具有很强的光吸收能力.由Cr(Ⅵ)还原率来评价STBBFS催化剂的光催化活性,结果表明,硫酸掺杂量为2.5%时,ST-BBFS催化剂具有较高的光催化活性,500W中压汞灯照射6h,可将浓度为20mg/L的Cr(Ⅵ)废水完全降解.
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