表面改性对含钛炉渣光催化性能的影响

以攀钢含钛高炉废渣为原料,掺杂不同比例稀硫酸,采用高能球磨复合无机改性低温煅烧的方法,合成了具有钙钛矿型的表面改性含钛炉渣催化剂(SMTBBFS).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SMTBBFS催化剂进行了表征,确定其具有钙钛矿结构;煅烧后出现明显团聚现象,粉体的颗粒形态均为不规则块状;在紫外-可见区域具有较强的光吸收能力.由Cr(Ⅵ)的光催化还原率来评价稀硫酸不同掺杂比例对SMTBBFS催化剂光催化活性的影响.结果表明:硫酸掺杂比例为2.5%时,SMTBBFS催化剂由于存在较高的CaTiO3/TiO2晶相比、吸附容量以及适宜的表面酸性,而具有较高的光催化活性.

Effect of Surface Modification on Photocatalytic Effect of Titanium-Bearing Blast Furnace Slag

With the titanium-bearing BF slag as starting material, the feasibility to reduce Cr(VI) in aqueous solution with the surface modified titanium-bearing blast furnace slag (SMTBBFS) used as a photocatalyst was investigated. The photocatalyst was characterized by X-ray diffraction (XRD), UV-vis diffuse reflectance spectra, thermogravimetric analysis (TG), Fourier transform infrared spectroscopy (FTIR) and scanning electronic microscopy(SEM). The photocatalytic effects of different SMTBBFS catalysts were evaluated by the photocatalytic reduction of Cr(VI) under UV-vis light irradiation. For the photocatalytic reduction of Cr(VI), the photocatalytic effect of SMTBBFS catalyst is found to be strongly dependent on CaTiO3/TiO2 ratio, adsorption capacity and surface acidity, and the optimum H2SO4-doping proportion is 2.5%.