表面改性对含钛炉渣光催化性能的影响

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

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.

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%.