Ghanem Ahmed F, Badawy Abdelrahman A, Youssef Ahmed A, Yehia Naema S, Issa Farag A, Nofal Manal A
Packaging Materials Department, Chemical Industries Research Institute, National Research Centre, 33 El Behooth St., Dokki, Giza, Egypt.
Physical Chemistry Department, Advanced Materials Technology and Mineral Resources Research Institute, National Research Centre, Giza, 12622, Egypt.
Sci Rep. 2025 Apr 3;15(1):11423. doi: 10.1038/s41598-025-87432-7.
In this work, titanium dioxide nanowires were prepared hydrothermally in strong alkaline medium. In parallel, nanostructural biochar was obtained via carbonization of rice husk at relatively high temperature. Then, titanate nanowires were modified with the nanorods of biochar via in-situ and ex-situ approaches in order to determine the best way to produce the nanocomposites with improved properties. Polyvinyl alcohol was used as a commercial matrix to include the superlative nanocomposite obtained and casted as a free-standing nanocomposite film. The synthesized nanowires, nanorods, and their nanocomposites were intensively investigated with transmission electron microscope (TEM), scanning electron microscope (SEM), energy dispersive X-ray (EDX), Fourier transform infrared (FTIR), X-ray diffraction (XRD), and N gas sorption. The microscopic images confirmed successful preparation and modification of nanostructures. FTIR showed strong interactions between the surface functional groups of the obtained nanomaterials. XRD exhibited a reduction in the crystallite size upon the treatment step. Also, surface texture analysis of titanate nanowires displayed a significant enhancement, particularly in terms of surface area and total pore volume. These superior properties promote the obtained nanocomposites to be evaluated in the water treatment compared with the pristine. The results confirmed complete removal of methylene blue (20 ppm) from the synthetic wastewater within only 20 min. in dark either by using the nanocomposites as powders or even as films. Kinetics and isotherms indicated that the adsorption process obeyed Langmuir model and follows pseudo-second order. On the other hand, the prepared materials depicted a strong biocidal activity against pathogenic microorganisms. The obtained nanocomposites may open opportunities towards developed adsorbents with superior features and performance for applications in the field of water decontamination.
在本工作中，二氧化钛纳米线在强碱性介质中通过水热法制备。同时，通过稻壳在相对高温下碳化获得纳米结构生物炭。然后，通过原位和异位方法用生物炭纳米棒对钛酸盐纳米线进行改性，以确定制备具有改进性能的纳米复合材料的最佳方法。使用聚乙烯醇作为商业基质来包含所获得的最佳纳米复合材料，并浇铸成独立的纳米复合膜。利用透射电子显微镜（TEM）、扫描电子显微镜（SEM）、能量色散X射线（EDX）、傅里叶变换红外光谱（FTIR）、X射线衍射（XRD）和N2气体吸附对合成的纳米线、纳米棒及其纳米复合材料进行了深入研究。微观图像证实了纳米结构的成功制备和改性。FTIR显示了所获得的纳米材料表面官能团之间的强相互作用。XRD表明在处理步骤后微晶尺寸减小。此外，钛酸盐纳米线的表面纹理分析显示出显著增强，特别是在表面积和总孔体积方面。这些优异的性能促使所获得的纳米复合材料与原始材料相比在水处理中得到评估。结果证实，无论是使用纳米复合材料粉末还是薄膜，在黑暗中仅20分钟内就能从合成废水中完全去除亚甲基蓝（20 ppm）。动力学和等温线表明吸附过程符合朗缪尔模型并遵循准二级动力学。另一方面，所制备的材料对致病微生物表现出很强的杀菌活性。所获得的纳米复合材料可能为开发具有优异特性和性能的吸附剂开辟机会，用于水净化领域的应用。
