Veisi Hojat, Abassi Parasto, Mohammadi Pourya, Tamoradi Taiebeh, Karmakar Bikash
Department of Chemistry, Payame Noor University, 19395-4697, Tehran, Iran.
Department of Chemistry, Gobardanga Hindu College, 24-Parganas (North), India.
Sci Rep. 2021 Feb 2;11(1):2734. doi: 10.1038/s41598-021-82242-z.
This current study involves the novel synthesis of Au nanoparticles (Au NPs) decorated biguanidine modified mesoporous silica KIT-5 following post-functionalization approach. The tiny Au NPs were being stabilized over the in situ prepared biguanidine ligand. The high surface area material was characterized using analytical techniques like Fourier Transformed infrared (FT-IR) spectroscopy, N-adsorption-desorption isotherm, Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM), Energy Dispersive X-ray Spectroscopy (EDS), and X-ray Diffraction study (XRD). Our material was found to be an efficient catalyst in the reductive degradation of harmful water contaminating organic dyes like Methylene blue (MB), Methyl Orange (MO) and Rhodamin B (RhB) in presence of NaBH at room temperature. The whole procedure was followed up with the help of time dependant UV-Vis spectroscopy. All the reactions followed pseudo-unimolecular kinetics and corresponding rate constant were determined. The reduction rate becomes high in presence of higher load of catalysts.
本研究采用后功能化方法，涉及新型合成金纳米颗粒（Au NPs）修饰的双胍改性介孔二氧化硅KIT-5。微小的Au NPs通过原位制备的双胍配体得以稳定。使用傅里叶变换红外（FT-IR）光谱、N吸附-脱附等温线、扫描电子显微镜（SEM）、透射电子显微镜（TEM）、能量色散X射线光谱（EDS）和X射线衍射研究（XRD）等分析技术对这种高比表面积材料进行了表征。我们发现该材料在室温下，于硼氢化钠存在的情况下，对有害水污染有机染料如亚甲基蓝（MB）、甲基橙（MO）和罗丹明B（RhB）的还原降解是一种高效催化剂。整个过程借助时间相关的紫外-可见光谱进行跟踪。所有反应均遵循准单分子动力学，并测定了相应的速率常数。在较高负载的催化剂存在下，还原速率会变高。
