Semi-volatile organic compounds (SVOCs) are ubiquitous contaminants in indoor environments that may have significant adverse effects on human health. This study investigated photocatalytic reaction behavior of Di-2-ethylhexyl phthalate (DEHP), a kind of typical semi-volatile organic compounds (SVOCs) with high boiling point (386.9 °C) and high molecular weight (390.56), over the surface platinized TiO₂. The oxidation state of platinum (Pt) was found to be the most important factor in determining the photocatalytic activity of DEHP. Platinized titania with oxidized Pt species (PtO_x/TiO₂) showed significantly higher photocatalytic activity than titania platinized with metallic Pt (Pt⁰/TiO₂). 1 wt% PtO_x /TiO₂ illustrated superior photocatalytic activity among the group of PtO_x/TiO₂ when substrate concentration reached at 1 %wt. Photocatalysis coupled with thermal catalysis could further strongly promote the degradation of DEHP. The Time-resolved PL indicated that photoexcited charge carrier lifetimes are longer for the PtO_x/TiO₂ compared with Pt/TiO₂, highlighting the beneficial effects of Pt oxide, especially PtO, in promoting the separation efficiency of photo generated carriers and further improving the photocatalytic oxidation of DEHP. This work provides a facile methodology to investigate the photocatalytic reaction of SVOCs over photocatalyst which proved the validation of photocatalytic oxidation as a possible strategy to remove SVOCs from indoor atmosphere.

半挥发性有机化合物 (SVOC) 是室内环境中普遍存在的污染物，可能对人类健康产生重大不利影响。本研究研究了邻苯二甲酸二乙基己酯 (DEHP) 的光催化反应行为，DEHP 是一种典型的高沸点 (386.9 °C) 和高分子量 (390.56) 半挥发性有机化合物 (SVOCs)，在镀铂表面上的光催化反应行为。 TiO ₂。发现铂 (Pt) 的氧化态是决定 DEHP 光催化活性的最重要因素。具有氧化 Pt 物质 (PtO _x /TiO ₂ ) 的镀铂二氧化钛显示出比使用金属 Pt (Pt ⁰ /TiO ₂ )镀铂的二氧化钛显着更高的光催化活性。1 重量％铂_X /二氧化钛₂所示优良的光催化的组的PtO中活性_X /二氧化钛₂时的底物浓度为1％（重量）达到。光催化结合热催化可以进一步强烈促进DEHP的降解。时间分辨 PL 表明，与 Pt/TiO ₂相比，PtO _x /TiO _{2 的}光激发电荷载流子寿命更长，突出了 Pt 氧化物，尤其是 PtO 在提高光生载流子分离效率和进一步改善 DEHP 光催化氧化方面的有益作用。这项工作为研究 SVOCs 在光催化剂上的光催化反应提供了一种简便的方法，证明了光催化氧化作为从室内大气中去除 SVOCs 的可能策略的验证。