Computationally guided synthesis of (2D/3D/2D) rGO/Fe2O3/g-C3N4 nanostructure with improved charge separation and transportation efficiency for degradation of pharmaceutical molecules
Computationally guided synthesis of (2D/3D/2D) rGO/Fe2O3/g-C3N4 nanostructure with improved charge separation and transportation efficiency for degradation of pharmaceutical molecules
复制标题
DOI：
10.1016/j.apcatb.2019.117758
复制
发表时间：
2019-10
期刊：
影响因子：
--
通讯作者：
S. Shanavas;S. Mohana Roopan;A. Priyadharsan;D. Devipriya;S. Jayapandi;Roberto Acevedo;P. M. Anbarasan-P.-M.-Anba
中科院分区：
文献类型：
--
作者：
S. Shanavas;S. Mohana Roopan;A. Priyadharsan;D. Devipriya;S. Jayapandi;Roberto Acevedo;P. M. Anbarasan-P.-M.-Anba
在本研究中，我们设计并成功地制备了全固态2D/3D/2D rGO/Fe_2O_3/g-C_3N_4纳米复合材料，方法是将3D-Fe_2O_3纳米颗粒包埋在2D-C_3N_4纳米片上，然后在响应面方法的支持下，通过简单的水热方法添加2D rGO纳米片。这种独特的2D/3D/2D异质结的形成导致在它们的界面接触处产生几个纳米通道，用于高速光致电荷转移。光致电荷传输和迁移效率的显著提高导致了新出现的药物报废在可见光驱动下的显著降解。通过在g-C3N4中加入不同浓度的Fe2O3对3D/2D Fe2O3/g-C3N4纳米复合材料进行了优化，然后对2D/3D/2D rGO/Fe2O3/g-C3N4纳米复合材料中的rGO浓度进行了优化，以获得最大的降解效率。我们观察到，在4%Fe_2O_3/g-C_3N_4纳米复合材料中，3%的rGO对四环素和环丙沙星的降解表现出较好的光催化活性，分别是g-C_3N_4纳米片的22倍和16倍。通过X射线衍射仪、傅里叶变换红外光谱、扫描电子能谱、高分辨透射电子显微镜、紫外可见光谱、荧光光谱、X射线光电子能谱、电子顺磁共振等表征手段，研究了2D/3D/2D g-rGO/Fe_2O_3/g-C_3N_4纳米复合材料之间的协同效应及其光催化机理。此外，2D/3D/2D rGO/Fe_2O_3/g-C_3N_4纳米复合材料具有良好的可回收性和稳定性，在环境修复方面具有广阔的应用前景。这项研究将为增强电荷迁移和分离的2D/3D/2D异质结纳米复合体系的广泛光催化性能提供一个值得注意的平台。
In this study, we designed and successfully prepared all solid state 2D/3D/2D rGO/Fe2O3/g-C3N4nanocomposite by embedding 3D Fe2O3nanoparticles on 2D g-C3N4nanosheets to for 3D/2D Fe2O3/g-C3N4followed by the addition of 2D rGO nanosheets via a simple hydrothermal technique with the support of response surface methodology for the first time. The formation of this unique 2D/3D/2D heterojunction leads to generate several nanochannels in their interfacial contact for high-speed photoinduced charge transfer. The considerable enhancement in photoinduced charge transportation and migration efficiency resulted in significant visible-light-driven degradation of emerging pharmaceutical condemnations. The 3D/2D Fe2O3/g-C3N4nanocomposite was optimized by various concentrations of Fe2O3in g-C3N4, followed by the optimization of rGO concentration in 2D/3D/2D rGO/Fe2O3/g-C3N4nanocomposite to obtain maximum degradation efficiency. We observed that the 3% of rGO in 4% Fe2O3/g-C3N4nanocomposite exhibited superior photocatalytic ability, nearly 22 times and 16 times higher than pristine g-C3N4nanosheets towards tetracycline and ciprofloxacin degradation, respectively. The synergistic effect between 2D/3D/2D g- rGO/Fe2O3/g-C3N4nanocomposites and the photocatalytic mechanism was well studied through various characterization techniques like XRD, FTIR, SEM-EDX-mapping, HR-TEM, UV–vis DRS, PL, XPS and EPR. In addition, the 2D/3D/2D rGO/Fe2O3/g-C3N4nanocomposite exhibits excellent recyclability and stability, establishing a promising application in environmental remediation. This research would provide a noteworthy platform for the extensive photocatalytic properties of 2D/3D/2D heterojunction nanocomposite system with enhanced charge migration and separation.