摘要
采用无机盐溶胶凝胶法制备了LiMn2O4尖晶石亚微米粉体,探讨了工艺参数对LiMn2O4化合物形成的影响。采用XRD、SEM、TEM研究了样品的晶体结构及其表面形貌,以其作为光催化剂对水溶性染料(活性艳红K-2G)进行了光催化性能研究,通过吸光度法表征了样品的光催化活性,采用重铬酸钾法研究了降解后染料溶液的化学需氧量,并根据配位场理论探讨了光催化反应的机理。结果表明,800℃热处理的LiMn2O4样品已完全形成尖晶石型晶体结构,晶粒呈长约300-400nm,宽约1.0-200nm,厚约100nm的短柱状,在可见光辐射下对染料溶液的降解脱色率和总有机碳去除率分别为76.5%和53.3%,是一种新型具有可见光活性的催化材料。
The spinel style LiMn2O4 sub-micron powders were prepared by inorganic salts sol-gel method. The crystal structure of the sample was examined by XRD, SEM and TEM. The photodegradation of dye (Reactive brilliant red K-2G) were carried out in the suspension systems of LiMn2O4 acting as photocatalyst. The results showed that LiMn2O4 powders sintered at 800 ℃ have the ideal configuration of spinel and the well photocatalytic property. The particles of crystal are short rod shape with 300-400 nm in length, 100-200 nm in width and about 100 nm in thickness. The decolori- zing rate and the COD removal yield of dye is 76.5% and 53.3% respectively. The spinel LiMn2O4 compound is a novel catalyst with visible light activity.
出处
《大连工业大学学报》
CAS
2008年第2期144-148,共5页
Journal of Dalian Polytechnic University