【摘要】 采用无机盐溶胶-凝胶法,由700℃热处理制备了纳米级尖晶石型CuAl2O4粉体。用X射线衍射和透射电子显微镜对材料的结构、形貌进行了分析和表征。结果表明:CuAl2O4为尖晶石型结构,呈现球型颗粒状,粒径大约为10～30nm。利用紫外-可见漫反射吸收光谱,得到吸收极限波长约为700nm,计算得到禁带宽度为1.77eV。在荧光汞灯(λ>400nm)照射下,纳米CuAl2O4粉体对甲基橙、酸性红B、活性艳红K-2G等有机物的2h脱色降解率均可达到97%。通过紫外光、荧光汞灯和太阳光等不同光照条件对甲基橙的光催化降解的比较表明:CuAl2O4光催化剂具有优异的可见光催化活性。更多还原

【Abstract】 Spinel copper aluminate (CuAl2O4) nanoparticles were prepared by the inorganic salt sol-gel method and heat-treatment at 700 ℃. The crystalline structure and morphology were characterized by powder X-ray diffraction and transmission electron micro- scope. The results indicate that the CuAl2O4 powder with particle sizes of 10-30 nm exhibit a spinel-type structure. The maximum wavelength of absorption is located at 700 nm in the ultraviolet-visible diffuse reflectance spectrum. The band gap was calculated as about 1.77 eV. The photocatalytic degradation was investigated by using methyl orange, acid red B and reactive red K-2G under the irradiation of mercury-vapor lamp (λ﹥400 nm). The degradation rates of these three organic compounds reach 97% in 2 h. Com- parison with the photocatalytic process using methyl orange under ultraviolet-light, mercury-vapor lamp and solar ray irradiation shows that spinel CuAl2O4 nanoparticles have excellent visible-light catalytic activity.更多还原