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Bicrystalline TiO2 heterojunction for enhanced organic photodegradation: engineering and exploring surface chemistry

机译：双晶TiO 2 异质结用于增强有机光降解：工程和探索表面化学

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Bicrystalline TiO2 anatase/rutile (TiAR) and anatase/brookite (TiAB) have been extensively studied for photocatalysis, but the differences in their surface chemistry (defect and non-defect) are still not well understood. Here we integrated treatment effect and phase heterojunction effect to engineer the surface chemistry of TiAR and TiAB. TiAR and TiAB were either reduced by H2 or oxidized by H2O2. TiAR consisted of nanoparticle (anatase) patched nanobricks (rutile), while TiAB was predominated with nanorods. After treatment, both of them retained their morphologies, crystal structure, and porosities. We found that untreated TiAB demonstrated a twice higher activity than TiAR in methylene orange (MO) degradation, mainly because of the more facilitated charge transfer between the anatase and brookite interface, exposure of surface Ti3+/O2? radicals, and the positively charged surface in TiAB. Interestingly, H2-reduced TiAR and TiAB showed a decrease in activity compared to their counterparts, while H2O2-treated TiO2 went through different mechanisms. H2O2 treatment induced a gradual decrease in the activity of TiAB(H2O2), depending on the treatment temperature. By contrast, TiAR(H2O2) showed three times enhancement in activity that was comparable to the most active TiAB. The findings in this work provided new insights that rather than crystallinity, particle size, surface area, and band gap, the photocatalytic performance of TiO2 is closely associated with the phase junction, surface charge and defect sites (Ti3+/vacancy).
机译：已经广泛研究了双晶TiO 2 锐钛矿/金红石（TiAR）和锐钛矿/板钛矿（TiAB）的光催化作用，但是它们的表面化学差异（缺陷和无缺陷） ）仍不太清楚。在这里，我们综合了处理效果和相异质结效果，以设计TiAR和TiAB的表面化学。 TiAR和TiAB被H 2 还原或被H 2 O 2氧化 。 TiAR由修补了纳米颗粒（锐钛矿）的纳米砖（金红石）组成，而TiAB则主要由纳米棒组成。处理后，它们都保留了其形态，晶体结构和孔隙率。我们发现未处理的TiAB在亚甲基橙（MO）降解中的活性比TiAR高两倍，这主要是由于锐钛矿和板钛矿界面之间的电荷转移更加容易，表面Ti 3 + / O 2 ？ 自由基，以及TiAB中带正电的表面。有趣的是，与H 2 相比，H 2 还原的TiAR和TiAB的活性降低。 O 2 处理的TiO 2 处理的机理不同。 H 2 O 2 处理导致TiAB（H 2 O 2 ），具体取决于处理温度。相比之下，TiAR（H 2 O 2 ）表现出三倍的活性增强，与大多数活性TiAB。这项工作的发现提供了新的见解，即TiO 2 的光催化性能与其结晶度，粒径，表面积和带隙无关，而与相结密切相关。 ，表面电荷和缺陷部位（Ti 3 + /空位）。

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