Jamila Ghulam Sughra, Sajjad Shamaila, Leghari Sajjad Ahmed Khan, Long Mingce
International Islamic University, H-10 Islamabad, Pakistan.
International Islamic University, H-10 Islamabad, Pakistan.
J Hazard Mater. 2020 Jan 15;382:121087. doi: 10.1016/j.jhazmat.2019.121087. Epub 2019 Aug 23.
Nitrogen doped carbon quantum dots (NCQDs) based highly efficient ternary photocatalyst are fabricated by modifying surface of GO incorporated WO nano-sheets. XRD confirmed the formation of monoclinicWO nano-sheets. All the characteristic peaks of WO, GO and NCQDs are obvious in XRD patterns of WO/GO/NCQDs ternary photocatalysts confirming successful fabrication of the photocatalysts. SEM images showed that WO host matrix is distorted after incorporation of GO and NCQDs owing to lower interfacial tension. The surface of WO nano-sheets is modified with morphological defects making more active sites available. UV-vis spectra exhibited extended visible light absorption and remarkable reduction of WO band gap energy. The photoluminescence spectra confirmed the efficient charge separation in NCQDs modified ternary photocatalyst. The synthesized composites were applied for the photocatalytic degradation of harmful organic dye i.e. methyl orange (MO). The ternary composites represented the excellent photocatalytic activity as compared to binary and pure WO photocatalysts. This enhanced photocatalytic activity is attributed to the availability of active sites, extended light absorption in visible region and enhanced charge separation efficiency.
通过修饰掺有氧化石墨烯（GO）的钨（WO）纳米片表面，制备了基于氮掺杂碳量子点（NCQDs）的高效三元光催化剂。X射线衍射（XRD）证实形成了单斜晶系的WO纳米片。在WO/GO/NCQDs三元光催化剂的XRD图谱中，WO、GO和NCQDs的所有特征峰都很明显，证实了光催化剂的成功制备。扫描电子显微镜（SEM）图像显示，由于界面张力较低，掺入GO和NCQDs后，WO主体基质发生了变形。WO纳米片的表面因形态缺陷而被修饰，从而提供了更多的活性位点。紫外可见光谱显示可见光吸收范围扩大，且WO带隙能量显著降低。光致发光光谱证实了NCQDs修饰的三元光催化剂中有效的电荷分离。合成的复合材料用于光催化降解有害有机染料，即甲基橙（MO）。与二元和纯WO光催化剂相比，三元复合材料表现出优异的光催化活性。这种增强的光催化活性归因于活性位点的存在、可见光区域光吸收范围的扩大以及电荷分离效率的提高。
