一步合成铁氮掺杂碳纳米粒子及其可见光催化

One Step Synthesis of Fe/N Co-Doped Carbon Nanoparticles for Photocatalysis

使用柠檬酸、草酸铵作为碳源物质,三氯化铁为铁源,直接热分解法一步合成铁氮掺杂碳纳米粒子。所得的铁氮掺杂碳纳米粒子溶液在365 nm的紫外辐射下发射蓝色荧光。对铁氮掺杂碳纳米粒子进行了XRD、TEM、FTIR、FL、XPS表征。合成的铁氮掺杂碳纳米粒子分散均匀,直径大约3-5 nm。荧光光谱表明：粒子荧光性能优良,发射光谱依赖激发波长变化,具有多色性。此外,合成的掺杂碳纳米粒子溶液在长波长的可见光和红外光激发下有较好的荧光辐射,具有上转换功能。将其应用于可见光光降解亚甲基蓝MB,在MB起始浓度为20 mg·L-1,不使用氧化剂时,15 h可以使褪色率达到90%;使用过氧化氢为氧化剂,15min可以达到97%,其光催化性能优良。对其氧化还原反应机理进行了电化学评估,评估结果与理论吻合。

A one step method of synthesis of iron-nitrogen doped carbon nanopartieles （Fe/NCNPs） is developedby pyrolysis using citric acid and ammonium oxalate as carbon source and FeC13 as iron source. The solution ofas-prepared Fe/NCNPs emits blue fluorescent under 365 nm UV. As-prepared Fe/NCNPs are investigated byXRD, TEM, FTIR, FL and XPS. The result indicates that as-prepared Fe/NCNPs are well- dispersed with anaverage diameter of about 3-5 nm. Its fluorescence spectra show that the particles have excellent fluorescenceperformance, and with increasing excitation wavelength, the fluorescence spectra shift to longer wavelengths,which is multicolor. In addition, the solution of as-prepared Fe/NCNPs has good short wavelength optical emissionwith long wavelength visible and infrared light excitation, which is the up-converting function. When as-preparedFe/NCNPs are applied to photocatalytic degradation of methylene blue （20 mg· L-1） irradiated by visible light,when the H202 is absent, the decolorization rate is over 90% in 15 hours; when H202 is present as oxidant, thedecolorization rate is over 97% in 15 min, revealing excellent photocatalytic activity. The redox reactionmechanism of the photocatalytic degradation is evaluatedwith the theory.by electrochemical method, and the result is consistent