Zhao Guixia, Sun Yubing, Zhao Yukun, Wen Tao, Wang Xiangxue, Chen Zhongshan, Sheng Guodong, Chen Chuncheng, Wang Xiangke
College of Environmental Science and Engineering , North China Electric Power University , Beijing 102206 , P. R. China.
Key Laboratory of Photochemistry, Beijing National Laboratory for Molecular Sciences, Institute of Chemistry , Chinese Academy of Sciences , Beijing 100190 , P. R. China.
Langmuir. 2019 Jan 8;35(1):276-283. doi: 10.1021/acs.langmuir.8b03214. Epub 2018 Dec 24.
To enhance the electron-hole separation and boost the practical performance of commercial titania (Degussa P25) under natural solar light, in this work, P25 was modified with Co(II) species (CoP25) through post-treatment with decomposition of Co-ethylenediaminetetraacetic acid precursors in a wet chemical anchoring process. With appropriate Co(II) loading amount as molecular cocatalyst, the resulted CoP25-4 showed significantly improved photocatalytic performance for Cr(VI) reduction and bisphenol A (BPA) oxidation under UV-light irradiation. The coexistence of Cr(VI) and BPA promoted mutually the degradation of both pollutants. Under simulated solar light (AM 1.5G) illumination, the Cr(VI) reduction rate over CoP25-4 was 8.5 times enhanced compared with that over P25, whereas the simultaneous degradation rate of BPA over CoP25-4 was 8 times higher than that over P25. Further investigations indicated that the covalent atomic Co(II) anchoring on P25 significantly promoted the photogenerated electron-hole separation and facilitated Cr(VI) reduction via the formation of a Co(I) intermediate and simultaneously boosted BPA oxidation. Our results demonstrated a facile strategy to modify P25 with remarkably improved performance for the practical application in environmental pollution management under natural light excitation.
为了增强电子 - 空穴分离并提高商用二氧化钛（德固赛P25）在自然太阳光下的实际性能，在本工作中，通过在湿化学锚定过程中用乙二胺四乙酸钴前体分解进行后处理，用钴（II）物种（CoP25）对P25进行了改性。以适当的钴（II）负载量作为分子助催化剂，所得的CoP25 - 4在紫外光照射下对Cr（VI）还原和双酚A（BPA）氧化表现出显著提高的光催化性能。Cr（VI）和BPA的共存相互促进了两种污染物的降解。在模拟太阳光（AM 1.5G）照射下，CoP25 - 4上的Cr（VI）还原速率比P25上的提高了8.5倍，而CoP25 - 4上BPA的同时降解速率比P25上的高8倍。进一步的研究表明，共价原子钴（II）锚定在P25上显著促进了光生电子 - 空穴分离，并通过形成Co（I）中间体促进了Cr（VI）还原，同时提高了BPA氧化。我们的结果展示了一种简便的策略来改性P25，其在自然光激发下在环境污染治理的实际应用中具有显著改善的性能。
