本文以壳聚糖为模板剂,用NaBH_4还原法制备了表面沉积Ag的纳米TiO_2粉体.采用透射电镜(TEM)、X射线粉末衍射(XRD)、傅立叶红外光谱(FT-IR)以及紫外-可见光谱(UV-Vis)等手段对产物进行了分析和表征.结果表明:壳聚糖的加入,使银的还原反应易于控制;Ag沉积纳米TiO_2粒子的UV-Vis光谱吸收阈值显著红移.所得产物在日光下对有机染料甲基橙有很好的光催化降解作用;无光照条件下,产物有很好的抗菌效果.
In the presence of the chitosan template, reduction with silver deposited TiO_2 nanoparticles were prepared via reduction with NaBH_4. The Ag/TiO_2 nanoparticles were characterized by TEM, XRD, FT-IR, and UV-Vis. The results showed that chitosan accession to the silver reduction reaction can be controlled easily;Nano-Ag/TiO_2 shaped in the square for most particles and the red-shift was observed clearly in the UV-Vis adsorption spectrum. The photocatalytic activity of the as-prepared Ag/TiO_2 nanopowders is satisfactory, which was confirmed by organic photodegradating tests under the sun light. In the absence of sunlight, the as-prepared Ag/TiO_2 has good anti-bacterial effect.
参考文献
| [1] | Guillard C;Bui T H;Felix C et al.Microbiological disinfection of water and air by photocatalysis[J].Comptes Rendus Chimie,2008,11:107-111. |
| [2] | Rincon A G;Pulgarin C .Bactericidal action of illuminated TiO_2 on pure escherichia coli and natural bacterial consortia:post-irradiation events in the dark and assessment of theeffective disinfection time[J].Applied Catalysis B:Environmental,2004,49:99-103. |
| [3] | FENGNA CHEN;XUDONG YANG;FENGFEI XU .Correlation of Photocatalytic Bactericidal Effect and Organic Matter Degradation of TiO2 Part I: Observation of Phenomena[J].Environmental Science & Technology: ES&T,2009(4):1180-1184. |
| [4] | 鞠剑峰,胡啸林.纳米Ag/TiO2复合材料的制备及性能研究[J].南通大学学报(自然科学版),2005(03):15-17,36. |
| [5] | Yang L P;Liu Z Y .Study on light intensity in the process of photocatalytic degradation of indoor gaseous formaldehyde for saving energy[J].Energy Conversion and Management,2007,48:882. |
| [6] | 刘曙光,魏伟.Ag+、Cu2+协同掺杂TiO2抗菌自洁粉体的制备、表征及应用[J].硅酸盐通报,2007(06):1136-1140. |
| [7] | 刘守新;刘鸿.光催化及光电催化基础与应用[M].北京:化学工业出版社,2006:74,77-78. |
| [8] | 刘曙光,魏伟.混晶结构纳米TiO2粉体的制备与性能表征[J].硅酸盐通报,2007(06):1089-1093. |
| [9] | 蒋挺大.壳聚糖[M].北京:化学工业出版社,2001:19-21. |
| [10] | 宋吉明,张胜义,史洪伟,金葆康,沈玉华.纳米银的软模板制备方法及形成机理研究[J].贵金属,2006(04):26-31. |
| [11] | Heinig J R .Method of treating water[P].US:USP 5352369 |
| [12] | Antelman .Divalent silver oxide bactericides[P].US:USP5098582 |
| [13] | Bae E;Choi W .Highly enhanced photoreductive of perchlorinated compounds on dye-sensitized metal/ TiO_2 under visible light[J].Environmental Science and Technology,2003,37(01):147-152. |
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