Song Liang, Zhao Xueyuan, Cao Lixin, Moon Ji-Won, Gu Baohua, Wang Wei
Key Laboratory of Biofuel, Chinese Academy of Sciences, Qingdao Institute of Bioenergy and Bioprocess Technology, Qingdao, Shandong 266101, P.R. China.
Nanoscale. 2015 Oct 28;7(40):16695-703. doi: 10.1039/c5nr03537f.
A two-step process is developed to synthesize rare earth doped titania nanorods (RE-TiO2 NRs) as photocatalysts for efficient degradation of lignin under simulated sunlight irradiation. In this approach, protonated titanate nanotubes with layered structures were first prepared by a hydrothermal approach, and rare earth metal ions were subsequently bound to the negatively charged surface of the synthesized titanate via electrostatic incorporation. The as-synthesized RE-TiO2 NRs after calcination generally showed much higher photocatalytic efficiencies than those of undoped TiO2 NRs or the commercial P25 TiO2 photocatalyst. Using methyl orange (MO) as a probing molecule, we demonstrate that Eu-TiO2 NRs are among the best for degrading MO, with an observed rate constant of 4.2 × 10(-3) s(-1). The La(3+), Sm(3+), Eu(3+) and Er(3+) doped TiO2 NRs also showed higher photocatalytic efficiencies in degrading MO than the commercial P25 TiO2. We further demonstrate that lignin can be photodegraded effectively and rapidly at room temperature under simulated sunlight through two reaction routes, which could be important in controlling ways of lignin depolymerization or the formation of reaction products.
开发了一种两步法来合成稀土掺杂的二氧化钛纳米棒（RE-TiO₂ NRs）作为光催化剂，用于在模拟太阳光照射下高效降解木质素。在这种方法中，首先通过水热法制备具有层状结构的质子化钛酸纳米管，随后稀土金属离子通过静电结合与合成的钛酸盐带负电的表面结合。煅烧后合成的RE-TiO₂ NRs通常比未掺杂的TiO₂ NRs或商业P25 TiO₂光催化剂表现出更高的光催化效率。使用甲基橙（MO）作为探测分子，我们证明Eu-TiO₂ NRs是降解MO的最佳材料之一，观察到的速率常数为4.2×10⁻³ s⁻¹。La³⁺、Sm³⁺、Eu³⁺和Er³⁺掺杂的TiO₂ NRs在降解MO方面也比商业P25 TiO₂表现出更高的光催化效率。我们进一步证明，在模拟太阳光下，木质素可以在室温下通过两条反应途径有效地快速光降解，这对于控制木质素解聚方式或反应产物的形成可能很重要。
