聚硅氧烷/钛溶胶光催化复合膜的光催化降解作用  

Photocatalysis of Polysiloxane / Titanium Sol Photocatalytic Composite Films

作　　者：戚栋明[1] 曹俊[1] 高玉洁[1] 曹志海[1] 

机构地区：[1]浙江理工大学生态染整技术教育部工程研究中心先进纺织材料与制备技术教育部重点实验室,杭州310018

出　　处：《高分子学报》2015年第1期1-7,共7页Acta Polymerica Sinica

基　　金：国家自然科学基金(基金号51273182);浙江理工大学521人才工程项目;浙江省科技成果转化推广工程项目(项目号2013T103)资助

摘　　要：以锐钛型的钛溶胶和粉体Ti O2为光催化材料,以聚硅氧烷(PDMS)和聚丙烯酸酯(PA)为黏合剂,制得相应的光催化复合膜.通过X-射线衍射分析、粒度分析、电镜观察等手段比较2种Ti O2颗粒的晶型及其在有机介质和复合膜中的分散状态,通过光学显微观察、载体降解失重评估、染液吸光度测定等方式考察Ti O2对两类黏合剂和酸性品红6B染料分子的光催化降解作用.发现溶胶-凝胶法可制得结晶程度较高的锐钛型钛溶胶,且所制颗粒晶粒更小、与有机介质和黏合剂的相容性更好,在复合膜中分散更均匀,因而更易光催化降解接近复合膜的染料分子,但同时也更易老化降解以低键能C—C键为主链的常规碳链黏合剂.而聚硅氧烷以高键能的Si—O键为主链,其抵御光催化所产高能自由基的氧化-还原作用的能力更强,是一种理想的光催化有机载体.通过聚硅氧烷与钛溶胶的有效复合,可在保证复合膜稳定性的同时赋予其更强的光催化降解作用.A series of photocatalytic composite films were prepared by using anatase titanium sol or P25 type TiO2 powders as photocatalytic materials, and polysiloxane （PDMS） or polyaerylate （PA） as binders. The crystalline phase and dispersion of the two TiO2 particles in organic media （toluene and polymeric matrixes） and photocatalytic degradation of organic matrixes by TiO2 particles were characterized by X-ray diffraction analysis, particle size analysis, field emission scanning electron microscopy, transmission electron microscopy, 3D optical microscopy,weight loss evaluation and UV-Vis spectroscopy,respectively. In addition,photocatalytic activity of PMDS/TiO2 composite films was evaluated by photocatalytic degradation of acid fuchsine 6B under UV irradiation. Titanium sol prepared via sol-gel process was composed of small crystalline grains with a size of about 3 nm, and indeed displayed a higher crystallinity. In comparison to P25 type TiO2, the titanium sol revealed a better compatibility with organic media. They could be uniformly dispersed in organic media without aggregation. Therefore, compared with the composite film with P25 type TiO2 , the C-C based polymeric matrix was degraded more seriously in the composite films with titanium sol due to their better photocatalytic ability and better dispersion. In contrast, the Si-O bonds in the main chain of polysiloxane could resist the strong oxidation of high-energy radicals derived from photoeatalytie titaniumsol. Thus,polysiloxane can be used as an ideal photocatalytic organic matrix to load titanium sol, photocatalytic activity and high stability can be obtained. and a kind of composite films with a strong

关 键 词：聚硅氧烷 钛溶胶 复合膜 光催化 

分 类 号：O643.32[理学—物理化学]