Sura Ankoor, Nain Sonia
Department of Chemistry, Deenbandhu Chhotu Ram University of Science and Technology Murthal-131039 Haryana India
RSC Adv. 2024 Nov 5;14(48):35336-35347. doi: 10.1039/d4ra06055e. eCollection 2024 Nov 4.
A sonication assisted method was employed to prepare a graphene oxide (GO)/sulfur doped carbon nitride (SCN) nanocomposite, demonstrating enhanced photocatalytic activity compared to GO and SCN. Extensive characterization confirmed the improved properties of the nanocomposite. X-ray Diffraction (XRD) results indicated that the SCN lattice remained intact upon GO addition while Fourier-transform infrared spectroscopy (FTIR) revealed chemical interaction between GO and SCN. X-ray photoelectron spectroscopy (XPS) confirmed sulfur incorporation into the graphitic carbon nitride (g-CN) lattice. Scanning electron microscopy (SEM) and Transmission Electron Microscopy (TEM) highlighted the distinct morphological features of GO, SCN, and GO/SCN nanocomposites, with SCN showing flat, thin nanosheets and GO displaying flake-like layers, both contributing to a high surface area and mechanical strength. In the GO/SCN nanocomposite, these structures were intermixed, enhancing surface area, mechanical stability, and electron mobility, which contributed to the improved catalytic performance. Ultraviolet-visible diffuse reflectance spectroscopy (UV-DRS) showed a reduction in band gap energy from 2.62 eV for SCN to 2.52 eV for the GO/SCN composite, leading to enhanced visible light absorption. Under visible light irradiation, low density polyethene (LDPE) films experienced significant degradation, evidenced by a 21% weight loss after 10 days, supported by SEM analyses showcasing surface changes on the LDPE films. The degradation was further confirmed by an increase in the carbonyl index (C.I.) from 0.37 to 1.24, measured through FTIR analyses, indicating oxidation corroborating the degradation process. Furthermore, BPA degradation reached 89.5% within 60 minutes under visible light irradiation. Radical trapping experiments confirmed hydroxyl radicals (˙OH) as the active oxygen species involved in the degradation of BPA.
采用超声辅助法制备了氧化石墨烯（GO）/硫掺杂氮化碳（SCN）纳米复合材料，与GO和SCN相比，其光催化活性增强。广泛的表征证实了该纳米复合材料性能的改善。X射线衍射（XRD）结果表明，添加GO后SCN晶格保持完整，而傅里叶变换红外光谱（FTIR）显示GO和SCN之间存在化学相互作用。X射线光电子能谱（XPS）证实硫掺入了石墨氮化碳（g-CN）晶格中。扫描电子显微镜（SEM）和透射电子显微镜（TEM）突出了GO、SCN和GO/SCN纳米复合材料独特的形态特征，SCN呈现出扁平、薄的纳米片，GO呈现出片状层，两者都有助于提高表面积和机械强度。在GO/SCN纳米复合材料中，这些结构相互混合，提高了表面积、机械稳定性和电子迁移率，这有助于提高催化性能。紫外-可见漫反射光谱（UV-DRS）显示带隙能量从SCN的2.62 eV降低到GO/SCN复合材料的2.52 eV，导致可见光吸收增强。在可见光照射下，低密度聚乙烯（LDPE）薄膜发生了显著降解，10天后重量损失21%证明了这一点，SEM分析显示LDPE薄膜表面发生了变化，进一步证实了降解。通过FTIR分析测量，羰基指数（C.I.）从0.37增加到1.24，进一步证实了降解，表明氧化证实了降解过程。此外，在可见光照射下，双酚A（BPA）在60分钟内的降解率达到89.5%。自由基捕获实验证实羟基自由基（˙OH）是参与BPA降解的活性氧物种。
