高活性rGO/Sm^(3+)-TiO_2光催化材料的制备及性能

Preparation and performance of high activity photocatalytic material rGO/Sm^(3+)-TiO_2

采用溶胶凝胶法,以氧化石墨烯(GO)、硝酸钐(Sm(NO_3)_3)为原料,钛酸四丁酯(TBT)为钛源,柠檬酸为水解抑制剂和表面活性剂制备了GO/Sm^(3+)-TiO_2复合材料,再通过硼氢化钠还原得到rGO/Sm^(3+)-TiO_2复合材料.通过X射线衍射(XRD)、透射电镜(TEM)、荧光光谱(PL)对样品进行分析表征;研究了GO的引入量及催化剂投入量对甲基橙降解效果的影响.结果表明:柠檬酸可有效抑制钛酸四丁酯的水解;rGO的引入可显著提高材料的分散性、延长光生载流子寿命和提升光催化效果;当GO质量分数为10%,GO/Sm^(3+)-TiO_2的加入量为0.10g时,甲基橙的降解率最高,可达到94.15%.

Taking the graphene oxide （GO） and samaric nitrate as raw materials, the tetrabutyl titanate （TBT） as titanium source, and the citric acid as hydrolysis inhibitor and surfactant, a composite of samari um doped graphene oxide/TiO2（rGO/Sm^3＋ TiO2） was prepared with sol gel method. Then its reduced photocata photocata ytic material rGO/Sm^3＋ TiO2 was obtained by means of sodium borohydride reduction. The yst sample was analyzed and characterized with X ray diffraction （XRD）, transmission electron microscopy （TEM） and photoluminescence （PL） spectroscopy and the effect of the amounts of GO addi tives and catalyst quantity on the degradation rate of methyl orange was investigated. The result showed that the hydrolysis of tetrabutyl titanate could be inhibited efficiently by means of citric acid. The intro duction of rGO could remarkably improve dispersity of TiO2 nanoparticles, prolong lifetime of photogener ated carrier and increase the photocatalytic performance of the composite. When the mass fraction of GO was 10% and the add on of photocatalysts was 0.10g, the composite would have the highest degradation rate of methyl orange, amounting to 94.15%.