摘要
利用壳聚糖与胶体TiO2的共混液通过流延成膜法制备了纳米TiO2/壳聚糖复合膜。用X-射线衍射仪和扫描电子显微镜表征了复合膜内TiO2的晶体结构和形貌,并研究了复合膜的力学性能、溶胀率、热稳定性及其在日光下对甲基橙水溶液的催化降解性能。结果表明,复合膜内TiO2为200-500 nm厚的层状晶体;在太阳光下照射60 min,交联复合膜对甲基橙水溶液的光催化降解率达70%;随着复合膜中TiO2的质量分数从1.96%增加到4.52%,复合膜的溶胀率从68.50%降低到62.21%,而拉伸强度达到最大值67.78 MPa;热分解温度为312℃。所制得的复合膜在日光下能快速降解甲基橙,可为利用太阳能处理染料废水提供一种新材料。
In this paper, nano TiO2/chitosan composite membrane was prepared by casting the mixture of chitosan and titanium dioxide colloidal. The crystal structure and morphology of TiO2 were characterized by X-ray and scanning electron micrograph, respectively. The mechanical properties, swelling degree and thermal stability of composite membranes were studied. The photodegradation performance for methyl orange of the composite membrane under sunlight was investigated. The results showed that there existed multilayer TiO2 crystal with 200-500 nm thickness in the membrane. Under sunlight, the photodegradation rate of methyl orange reached 70 % in 60 min catalyzed by cross-linked TiO2/chitosan composite membrane. With the mass fraction of TiO2 increased from 1.96% to 4. 52% , the swelling degree decreased from 68. 50% to 62.21% and the tensile strength increased to the optimal value of 67. 78 MPa. The decomposition temperature of composite membrane was 312 ℃. The obtained composite membrane could degrade methyl orange under sunlight swiftly, which might be a kind of novel material for the treatment of dye wastewater.
出处
《化学与生物工程》
CAS
2008年第5期13-15,19,共4页
Chemistry & Bioengineering
基金
武汉市科技局科技计划资助项目(200751699478-06)
江汉大学博士基金项目(2006-68)
关键词
壳聚糖
二氧化钛
复合膜
光催化
日光
chitosan
TiO2
composite membrane
photocatalysis
sunlight
