利用钛精矿湿化学法合成光催化纳米粉体

Synthesis of Photocatalytic Nanopowders Using Ilmenite Concentrate by a Wet Chemical Process

利用普通的钛精矿作为起始原料，联合使用浓盐酸浸出及柠檬酸凝胶燃烧法合成一种新型光催化纳米粉体。着重研究了锌离子含量和柠檬酸历肖酸摩尔比对射米粉体的微观结构及其光催化性能的影响。利用化学分析，X射线衍射，透射电子显微镜，紫外-可见漫反射吸收光谱，紫外-可见分光光度计对合成粉体的性能进行表征。通过光催化降解甲基橙溶液来评估合成粉体的光催化活性，在高压汞灯／纳米光催化粉体／双氧水体系中，光照60min后甲基橙染料的脱色率达到95％。

Using the general ilmenite concentrate as the starting materials, the new photocatalytic nanopowders were synthesized by concentrated hydrochloric acid extraction and citric acid-nitrates sol-gel combustion technique. Special attention was given to the influence of Zn^2＋ content and nitric acid/citric acid molar ratio on the microstructure and photocatalytic properties of nanopowders. Chemical analysis, X-ray diffraction, transmission electron microscope, UV-visible diffuse reflectance absorption spectra and UV-visible spectrophotometer were employed to characterize nanopowders samples. The photocatalytic activities were evaluated by photocatalytic degradation of methyl orange solutions, and at the system of UV/nanopowders/H2O2, the discolouration rate of methyl orange solutions is up to 95% after illuminating for 60min.