蒸发诱导自组装法合成介孔铝酸钴尖晶石

Synthesis of CoAl2O4 spinel with mesoporous structure by evaporation induced self-assembly method

采用嵌段聚合物F127为表面活性剂,以硝酸铝和硝酸钴为无机先驱物,通过蒸发诱导自组装的方法合成了介孔结构的铝酸钴尖晶石。X射线衍射(XRD)表明样品具有单一的尖晶石型结构。利用氮气吸附-脱附比表面测定仪测得不同焙烧温度样品的比表面积和孔径,发现650℃焙烧的样品比表面积最大,为89.1 m2/g,孔径为8.7 nm。通过紫外-可见光谱测定表明介孔铝酸钴样品为明亮的蓝色,在545、585、625 nm处有3重吸收峰。

Mesoporous CoAl2O4 spinel has been successfully synthesized by evaporation-induced self-assembly （EISA） method with aluminum nitrate and cobalt nitrate as inorganic precursors ,triblock copolymer pluronic F-127 as surface active agent. X-ray diffraction （XRD） pattern showed that the sample was single-phase cubic material with the spinehype struc- ture.Specific surface area and porous size of the samples sintered under different temperatures were determined by nitrogen adsorption-desorption measurement.It was found that the sample sintered under 650 ~C had the biggest surface area, and the surface area and pore size were 89.1 m2/g and 7.8 nm,respectively.The COA1204 spinel powders displayed bright blue color with a triple absorption peak around 545,585, and 625 nm by UV-visible spectrometer.