Nanjing Hydraulic Research Institute, Nanjing 210029, China; Nanjing R&D High Technology Co. Ltd, Nanjing 210024, China; Research Center on New Materials in Hydraulic Structures, Ministry of Water Resources, Nanjing 210024, China.
Nanjing Hydraulic Research Institute, Nanjing 210029, China; Nanjing R&D High Technology Co. Ltd, Nanjing 210024, China; Research Center on New Materials in Hydraulic Structures, Ministry of Water Resources, Nanjing 210024, China.
J Colloid Interface Sci. 2019 Jan 1;533:344-357. doi: 10.1016/j.jcis.2018.08.089. Epub 2018 Aug 27.
To improve the visible light utilization and adsorption capacity for combined pollutants (Tetracycline and Cu), novel flower-like BiVO/BiTiO/FeO composite has been successfully synthesized for the first time via a simple two-step process, surfactant-free hydrothermal route and solvothermal method. The crystal structures, chemical compositions, morphologies, optical and photocatalytic properties of the as-prepared samples were characterized by the techniques of XRD, XPS, SEM, HRTEM, BET, UV-vis DRS, and Photocurrent tests (PT). The synthetic sample with 4:1:20 (S5) mass ratio of BiVO/BiTiO/FeO possessed the highest adsorption capacity and photocatalytic performance simultaneously in all of the as-prepared composites. Adsorption experiment (model 1 and model 2) suggested that there was not only competitive adsorption but also synergistic adsorption mechanisms between Cu and TC. Compared to pure BiVO, and BiVO/BiTiO, BiVO/BiTiO/FeO displayed more superior photodegradation efficiency with 97.22% removal of TC (10 mg/L) in 60 min, where the optimal conditions were catalyst dosage 1.00 g/L and initial pH at 6.0. In addition, radical trapping experiments revealed that the photo-induced active species superoxide radical (O) and holes (h) were the predominant active species in the photocatalytic system. These features demonstrate that the BiVO/BiTiO/FeO has great application potential for combined pollutants' removal from water.
为了提高可见光利用率和对复合污染物（四环素和 Cu）的吸附能力，首次通过无表面活性剂水热法和溶剂热法成功合成了新型花状 BiVO/BiTiO/FeO 复合材料。采用 XRD、XPS、SEM、HRTEM、BET、UV-vis DRS 和光电流测试（PT）等技术对所制备样品的晶体结构、化学组成、形貌、光学和光催化性能进行了表征。在所制备的复合材料中，具有 4:1:20（S5）质量比的 BiVO/BiTiO/FeO 合成样品同时具有最高的吸附容量和光催化性能。吸附实验（模型 1 和模型 2）表明，Cu 和 TC 之间不仅存在竞争吸附，还存在协同吸附机制。与纯 BiVO 和 BiVO/BiTiO 相比，BiVO/BiTiO/FeO 在 60 分钟内对 TC（10 mg/L）的去除率达到了 97.22%，显示出更优越的光降解效率，其中最佳条件是催化剂用量为 1.00 g/L，初始 pH 值为 6.0。此外，自由基捕获实验表明，光诱导的活性物质超氧自由基（O）和空穴（h）是光催化体系中的主要活性物质。这些特点表明，BiVO/BiTiO/FeO 具有从水中去除复合污染物的巨大应用潜力。
