Preparation Of Bismuth Based Nanomaterials And The Research Of Their Catalytic Performance

In recent years,water pollution has aroused wide concern because of its harmful to people.There are many kinds of pollutants in water,especially the organic pollutants,such as p-nitrophenol and dyes,which are highly toxic and harmful.The common methods to deal with these pollutants are catalytic hydrogenation,photodegradation,etc.But these methods require catalysts.It is an important work for researchers to search for nanomaterials with high catalytic activity.In this work,a facile one-step hydrothermal method has been developed for the fabrication of bismuth nanoparticles embedded carbon nanocomposites?Bi@Cs?with porous network structure.In this approach,natural polysaccharide alginate acts as both carbon source and reducing agent that can reduce Bi³⁺to form Bi nanoparticls.The composition and morphology of Bi@Cs were characterized by X-ray diffraction,transmission electronic microscopy,energy dispersive X-ray spectrum,Fourier transforminfraredspectroscopy,thermogravimetricanalysis,and Brunauer-Emmett-Teller analysis.The catalytic activity of Bi@Cs was investigated by catalytic reduction of 4-nitrophenol as template,and the reaction process was monitored by UV–visible absorption spectroscopy.The result shows that the catalyst has high activity in the 4-nitrophenol reduction.At the same time,the catalytic degradation of organic dyes were also studied.We prepared Bi/Bi₂₅FeO₄₀0 magnetic nanocomposites by hydrothermal method,using X-ray diffraction,transmission electronic microscopy,Fourier transform infrared spectroscopy,thermogravimetric analysis,X-ray photoelectron spectroscopy to study the composition and morphology of Bi/Bi₂₅FeO₄₀.We used the reduction of4-nitrophenol to evaluate the catalytic activity.Bismuth carbon?Bi/C?nanomaterials were obtained through a mild one-step hydrothermal process by using ammonium bismuth citrate as the bismuth source and sodium alginate as reduction agent and carbon source.The Bi/C nanomaterials were characterized by X-ray diffraction,transmission electronic microscopy,Fourier transform infrared spectroscopy and thermogravimetric analysis.We investigated the catalytic performance of the catalyst for the catalytic reduction of p-nitrophenol and the photocatalytic degradation of rhodamine B.