Commercial titania sample (P25) was homogenized first (HomoP25), and then crystalline phases (anatase and rutile) were isolated from it by chemical dissolution methods followed by samples’ purification by washing and annealing. The photocatalytic activities were tested for anaerobic methanol dehydrogenation in two reaction systems: (1) under UV/vis polychromatic irradiation with in situ platinum (Pt) deposition, and (2) under UV/vis monochromatic irradiation (action spectra) for ex situ platinum deposition. The properties of bare and modified titania samples were investigated by XRD, DRS, STEM, BET and zeta potential measurements. It was found that platinized rutile was more active than platinized anatase and platinized HomoP25, due to ability of photoabsorption of more photons (narrower band gap). Moreover, in HomoP25 sample, rutile was platinized first, probably due to positively charged surface allowing favorable adsorption of chloroplatinate ions. More than 10 times lower content of Pt (<0.1 wt%) deposited on annealed samples (forming aggregates with an increased interface between titania NPs) than that on HomoP25 (2 wt%) resulted in similar level of photocatalytic activity, suggesting an interparticle electron transfer (IPET) between titania NPs inside one aggregates (one Pt NP was sufficient for one aggregate).

首先将商品二氧化钛样品（P25）均质化（HomoP25），然后通过化学溶解方法从其中分离出结晶相（锐钛矿和金红石），然后通过洗涤和退火纯化样品。在两个反应系统中测试了厌氧甲醇脱氢的光催化活性：（1）在原位沉积铂（Pt）的UV / vis多色辐射下，和（2）在原位沉积的UV / vis单色辐射（作用谱）下沉积。通过XRD，DRS，STEM，BET和Zeta电位测量研究了裸露的和改性的二氧化钛样品的性能。已发现，由于更多光子的光吸收能力（较窄的带隙），铂金红石棉比铂锐钛矿和铂HomoP25具有更高的活性。此外，在HomoP25样本中，金红石首先被镀铂，这可能是由于带正电的表面允许氯铂酸根离子的良好吸附。与HomoP25（2 wt％）相比，沉积在退火样品上的Pt（<0.1 wt％）含量（形成二氧化钛NPs之间的界面增加）的Pt含量低10倍以上，导致相似程度的光催化活性，表明粒子间电子一种聚集体中二氧化钛NP之间的碳转移（IPET）（一个聚集体中一个Pt NP就足够了）。