Department of Chemistry, Federal University of Technology, PMB. 65, Minna, Niger State, Nigeria; Nanotechnology Research Group, Centre for Genetic Engineering and Biotechnology (CGEB), Federal University of Technology, P.M.B 65, Bosso, Minna, Niger State, Nigeria.
Department of Chemistry, Federal University of Technology, PMB. 65, Minna, Niger State, Nigeria; Nanotechnology Research Group, Centre for Genetic Engineering and Biotechnology (CGEB), Federal University of Technology, P.M.B 65, Bosso, Minna, Niger State, Nigeria.
J Environ Manage. 2019 Apr 15;236:519-533. doi: 10.1016/j.jenvman.2019.02.027. Epub 2019 Feb 13.
In the present work, one-step green synthesis of WO based on the interaction of ammonium paratungstate and Spondias mombin leaves extract is reported. Different concentrations of iodine and phosphorus in the range of (2%, 5% and 10%) were firstly incorporated into the prepared WO nanoparticles to obtain Iodine doped and Phosphorus doped WO nanoparticles respectively. Subsequently, iodine and phosphorus co-doped WO nanocomposites was prepared using a wet impregnation method followed by calcination at high temperature. The nanomaterials were characterized by HRSEM, HRTEM, BET, UV-Visible, EDS, XRD and XPS. The photo-oxidation of dyeing wastewater by the synthesized WO nanomaterials were tested and assessed using Total organic carbon (TOC) and Chemical oxygen demand (COD) as indicator parameters. XRD and HRSEM analysis demonstrated the formation of only monoclinic phase of WO irrespective of the dopants. The UV-Visible diffuse reflectance spectroscopy showed the band gap energy of 2.61 eV for undoped WO and 2.02 eV for I-P co-doped WO nanocomposites. The surface area of I-P co-doped WO (416.18 m/g) was higher than the undoped WO (352.49 m/g). The XPS demonstrated interstitial and substitution of oxygen (O) vacancies in WO by I and P and formed I-P-WO(). The I-P co-doped WO exhibited higher catalytic activities (93.4% TOC, 95.1% COD) than the undoped (54.9% TOC, 79.2% COD) due to the synergistic effects between the two dopants. The experimental data better fitted to pseudo-second order than first order and pseudo-first order model. This study demonstrated the enhanced photocatalytic performance of I-P co-doped WO nanocomposites under sunlight.
在本工作中，报道了一种基于仲钨酸铵与杧果叶提取物相互作用的 WO 的一步绿色合成方法。首先将不同浓度（2%、5%和 10%）的碘和磷掺入到制备的 WO 纳米粒子中，分别得到碘掺杂和磷掺杂 WO 纳米粒子。随后，采用湿浸渍法，再经高温煅烧，制备了碘磷共掺杂 WO 纳米复合材料。采用 HRSEM、HRTEM、BET、UV-Visible、EDS、XRD 和 XPS 对纳米材料进行了表征。采用总有机碳（TOC）和化学需氧量（COD）作为指标参数，测试和评估了合成的 WO 纳米材料对染料废水的光氧化性能。XRD 和 HRSEM 分析表明，无论掺杂与否，均只形成单斜相 WO。紫外可见漫反射光谱显示，未掺杂 WO 的带隙能为 2.61 eV，I-P 共掺杂 WO 纳米复合材料的带隙能为 2.02 eV。I-P 共掺杂 WO 的比表面积（416.18 m/g）高于未掺杂 WO（352.49 m/g）。XPS 表明 I 和 P 替代和占据了 WO 中的氧（O）空位，形成了 I-P-WO（）。由于两种掺杂剂之间的协同作用，I-P 共掺杂 WO 表现出更高的催化活性（93.4% TOC，95.1% COD），优于未掺杂的（54.9% TOC，79.2% COD）。实验数据更符合准二级动力学模型，而不是一级动力学和准一级动力学模型。本研究证明了 I-P 共掺杂 WO 纳米复合材料在阳光下具有增强的光催化性能。
