Sayed Murtaza, Shah Luqman Ali, Khan Javed Ali, Shah Noor S, Nisar Jan, Khan Hasan M, Zhang Pengyi, Khan Abdur Rahman
State Key Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University , Beijing, 10084, China.
Department of Chemistry, COMSATS Institute of Information Technology , Abbottabad, 22060, Pakistan.
J Phys Chem A. 2016 Dec 22;120(50):9916-9931. doi: 10.1021/acs.jpca.6b09719. Epub 2016 Dec 13.
In this study, a novel immobilized TiO/Ti film with exposed {001} facets was prepared via a facile one-pot hydrothermal route for the degradation of norfloxacin from aqueous media. The effects of various hydrothermal conditions (i.e., solution pH, hydrothermal time (H) and HF concentration) on the growth of {001} faceted TiO/Ti film were investigated. The maximum photocatalytic performance of {001} faceted TiO/Ti film was observed when prepared at pH 2.62, H of 3 h and at HF concentration of 0.02 M. The as-prepared {001} faceted TiO/Ti films were fully characterized by field-emission scanning electron microscope (FE-SEM), X-ray diffraction (XRD), high resolution transmission electron microscope (HR-TEM), and X-ray photoelectron spectroscopy (XPS). More importantly, the as-prepared {001} faceted TiO/Ti film exhibited excellent photocatalytic performance toward degradation of norfloxacin in various water matrices (Milli-Q water, tap water, river water and synthetic wastewater). The individual influence of various anions (SO, HCO, NO, Cl) and cations (K, Ca, Mg, Cu, Na, Fe) usually present in the real water samples on the photocatalytic performance of as-prepared TiO/Ti film with exposed {001} facet was investigated. The mechanistic studies revealed that OH is mainly involved in the photocatalytic degradation of norfloxacin by {001} faceted TiO/Ti film. In addition, norfloxacin degradation byproducts were investigated, on the basis of which degradation schemes were proposed.
在本研究中，通过简便的一锅水热法制备了一种具有暴露{001}晶面的新型固定化TiO/Ti薄膜，用于从水介质中降解诺氟沙星。研究了各种水热条件（即溶液pH值、水热时间（H）和HF浓度）对{001}晶面TiO/Ti薄膜生长的影响。当在pH值为2.62、H为3小时且HF浓度为0.02 M的条件下制备时，观察到{001}晶面TiO/Ti薄膜具有最大的光催化性能。通过场发射扫描电子显微镜（FE-SEM）、X射线衍射（XRD）、高分辨率透射电子显微镜（HR-TEM）和X射线光电子能谱（XPS）对所制备的{001}晶面TiO/Ti薄膜进行了全面表征。更重要的是，所制备的{001}晶面TiO/Ti薄膜在各种水基质（超纯水、自来水、河水和合成废水）中对诺氟沙星的降解表现出优异的光催化性能。研究了实际水样中通常存在的各种阴离子（SO、HCO、NO、Cl）和阳离子（K、Ca、Mg、Cu、Na、Fe）对所制备的具有暴露{001}晶面的TiO/Ti薄膜光催化性能的单独影响。机理研究表明，OH主要参与{001}晶面TiO/Ti薄膜对诺氟沙星的光催化降解。此外，对诺氟沙星降解副产物进行了研究，并在此基础上提出了降解方案。
