Institute of Applied Materials Science (IAMS)-Vietnam Academy of Science and Technology (VAST), 01A Thanh Loc 29 Street, Thanh Loc Ward, District 12, Ho Chi Minh City 700000, Vietnam.
Graduate University of Science and Technology-Vietnam Academy of Science and Technology (VAST), 18 Hoang Quoc Viet Street, Nghia Do Ward, Cau Giay District, Ha Noi 100000, Vietnam.
J Nanosci Nanotechnol. 2021 Mar 1;21(3):1507-1516. doi: 10.1166/jnn.2021.19076.
In this study, graphene oxide (GO) sheets were successfully synthesized using two routes: conventional Hummers' (HGO) and modified Hummers' (or Marcano's) (MGO) methods. GO sheets were then assembled with TiO₂ nanoparticles to form nanocomposites (i.e., HGO-TO and MGO-TO). The properties of HGO and MGO and their nanocomposites with TiO₂ were evaluated by Fouriertransform infrared (FTIR), Raman, ultraviolet-visible (UV-Vis) adsorption, and diffuse reflectance (DRS) spectroscopies, X-ray diffraction (XRD), and thermal gravimetric analysis (TGA). The specific surface area, pore volume, and pore size of MGO, determined by Brunauer-Emmett-Teller (BET) equation, were 565 m²g, 376 cm³ g, and 30 nm, respectively; all of these parameters decreased after MGO was combined with TiO₂. In addition, compared with HGO, MGO possessed higher oxidation level and more stable bonding with TiO₂ nanoparticles. The morphology of HGO and MGO, which were characterized by scanning electron (SEM) and transmission electron microscopies (TEM), together with energy-dispersive X-ray (EDX) spectroscopy and elemental mapping technique, was determined to consist of TiO₂ nanoparticle-assembled GO sheets. All GO-TiO₂ nanocomposite samples exhibited a very high activity (˜100%) toward rhodamine B (RhB) dye photodegradation under natural sunlight exposure within 60 min. The obtained results for the GO-TiO₂ nanocomposite showed the potential of its application in wastewater purification and other environmental aspects.
在这项研究中，使用两种方法成功合成了氧化石墨烯（GO）片：传统的 Hummers'（HGO）和改良的 Hummers'（或 Marcano's）（MGO）方法。然后，GO 片与 TiO₂ 纳米粒子组装形成纳米复合材料（即 HGO-TO 和 MGO-TO）。通过傅里叶变换红外（FTIR）、拉曼、紫外-可见（UV-Vis）吸附和漫反射（DRS）光谱、X 射线衍射（XRD）和热重分析（TGA）评估了 HGO 和 MGO 及其与 TiO₂ 的纳米复合材料的性质。通过 Brunauer-Emmett-Teller（BET）方程确定的 MGO 的比表面积、孔体积和孔径分别为 565 m²g、376 cm³ g 和 30 nm；这些参数在 MGO 与 TiO₂ 结合后均降低。此外，与 HGO 相比，MGO 具有更高的氧化水平和与 TiO₂ 纳米粒子更稳定的键合。通过扫描电子显微镜（SEM）和透射电子显微镜（TEM）以及能量色散 X 射线（EDX）光谱和元素映射技术对 HGO 和 MGO 的形态进行了表征，其特征是由 TiO₂ 纳米粒子组装的 GO 片。所有 GO-TiO₂ 纳米复合材料样品在 60 分钟内的自然光照射下对罗丹明 B（RhB）染料的光降解表现出非常高的活性（˜100%）。所得的 GO-TiO₂ 纳米复合材料的结果表明了其在废水净化和其他环境方面的应用潜力。
