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首页> 外文期刊>ACS applied materials & interfaces >Effect of Surface Fluorination of TiO2 Particles on Photocatalitytic Activity of a Hybrid Multilayer Coating Obtained by Sol-Gel Method
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Effect of Surface Fluorination of TiO2 Particles on Photocatalitytic Activity of a Hybrid Multilayer Coating Obtained by Sol-Gel Method

机译：TiO2颗粒的表面氟化对溶胶-凝胶法获得的多层杂化涂层光催化活性的影响

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摘要

A multilayer photoactive coating containing surface fluorinated TiO2 nanoparticles and hybrid matrices by sol gel approach based on renewable chitosan was applied on poly(lactic acid) (PLA) film by a step wise spin-coating method. The upper photoactive layer contains nano-sized functionalized TiO2 particles dispersed in a siloxane based matrix. For the purpose of improving TiO2 dispersion at theair interface coating surface, TiO2 nanoparticles were modified by silane coupling agent 1H,1H,2H,2H-perfluorooctyltriethox-ysilane (FTS) wth fluoro-organic side chains. An additional hybrid material consisting of chitosan (CS) cross-linked with 3-glycidyloxypropyl trimethoxy silane (GOTMS) was applied as interlayer between the PLA substrate and the upper photoactive coating to increase the adhesion and reciprocal affinity. The multilayer TiO2/CS-GOTMS coatings on PLA films showed a thickness of ～4-6 μm and resulted highly transparent. Their structure was exhaustively characterized by SEM, optical microscope, UV-vis spectroscopy and contact angle measurements. The photocatalytic activity of the multilayer coatings were investigated using methyl orange (MeO) as a target pollutant; the results showed that PLA films coated with surface fluorinated particles exhibit higher activity than films with neat particles, because of a better dispersion of TiO2 particles. The mechanical properties of PLA and films coated with fluorinated particles, irradiated by UV light were also investigated; the results showed that the degradation of PLA substrate was markedly suppressed because of the UV adsorptive action of the multilayer coating.
机译：通过逐步旋涂法，在聚乳酸（PLA）薄膜上涂覆了基于可再生脱乙酰壳多糖的包含表面氟化TiO2纳米粒子和杂化基质的多层光敏涂层，该涂层通过溶胶凝胶法形成。上部光敏层包含分散在硅氧烷基基质中的纳米级功能化TiO2颗粒。为了改善TiO 2在空气界面涂层表面的分散性，TiO 2纳米粒子通过硅烷偶联剂1H，1H，2H，2H-全氟辛基三乙氧基-硅烷（FTS）和氟有机侧链进行了改性。将由与3-环氧丙氧基丙基三甲氧基硅烷（GOTMS）交联的壳聚糖（CS）组成的其他杂化材料用作PLA基材和上层光敏涂层之间的中间层，以增加粘附力和相互亲和力。 PLA膜上的多层TiO2 / CS-GOTMS涂层的厚度约为〜4-6μm，并具有高度透明性。通过SEM，光学显微镜，紫外可见光谱和接触角测量对它们的结构进行了详尽的表征。以甲基橙（MeO）为目标污染物，研究了多层涂层的光催化活性。结果表明，由于TiO2颗粒的分散性好，表面氟化颗粒涂覆的PLA膜比纯净颗粒的膜具有更高的活性。还研究了PLA和涂有氟化颗粒的薄膜在紫外光照射下的力学性能。结果表明，由于多层涂层的紫外线吸收作用，PLA基材的降解得到了显着抑制。

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