等离子体强化PVC光催化降解的FT-IR和XPS分析

The Analysis of FT-IR and XPS on Plasma-Enhanced Solid-Phase Photocatalysis with TiO_2

纳米锐钛矿TiO2光催化剂用于室温下固相光催化降解等离子体改性聚氯乙烯(PVC)薄膜的研究。对薄膜进行了扫描电子显微镜(SEM)、傅立叶红外光谱(FI-IR)、X光电子能谱(XPS)分析。结果表明,400 W紫外光辐射60 h后,PVC质量损失为1.393%;等离子体改性PVC-TiO2质量损失为1.966%,这表明TiO2加速了高分子碳链的断裂和光氧化。在等离子体改性PVC-TiO2表面形成大量的裂纹,XPS显示光催化降解后在等离子体改性PVC-TiO2的表面的C和Cl的原子浓度分别为83.15%和0.89%,达到最小值。等离子体改性的PVC的降解机理是等离子体改性PVC后,在PVC表面生成的自由基诱发了TiO2的光催化氧化的.OH自由基反应。

A nano-size anatase TiO2 was used to degrade the PVC films treated by plasma under UV irradiation. The results show that the mass loss rate of PVC is 1. 393 %, while the mass loss of PVC films treated by plasma amounts to 1. 966 % with anatase TiO2 with the intensity of 400 W for 60 h. This indicates that TiO2 speeds up the photocatalytic degradation of PVC chains. The SEM of the PVC film treated by plasma with TiO2 shows a lot of crack on the film surface. The XPS indicates that the C and （21 atom concentration which reaches minimums is 83.15 % and 0.89 % on the surface of plasma-treated PVC-TiO2, respectively. The degradation mechanism of plasma-treated PVC-TiO2 is possibly that the radicals on the surface of plasma-treated PVC induce radical reaction of ·OH.