Studies On The Synthesis Of Fe-doped Mesoporous Carbon And Its Application In Adsorption, Electrochemistry, Catalysis

Ordered mesoporous carbon material is a new type of non-silicon-based mesoporous materials, which has been widely applied in the adsorption and separation, electrochemistry, catalysis and energy storage due to its large specific surface area and pore volume, uniform tunable pore size, good mechanical and chemical stability, and good electrical conductivity. Ordered mesoporous carbon can combine the metat particles by different functional modification, which has very important application prospect and research value for the performance improvement. In this paper, we selected ordered mesoporous carbon as the research object and studied the doping with iron. Our research is mainly focused on the modification of mesoporous carbon and its application in adsorption and separation, electrochemical detection and industrial catalysis.Based on the fundamental literature review, ordered mesoporous carbon materials with good magnetism, high graphitization degree and strong catalytic activity have been successfully synthesized by different methods and different carbon sources, respectively. The whole paper consists of three parts,(I) the synthesis of magnetic ordered mesoporous carbon from hard templates and its application in wastewater adsorption treatment (Chapter2);(Ⅱ) the synthesis of graphitic ordered mesoporous carbon and its application in electrochemical detection (Chapter3);(Ⅲ) the synthesis of Fe-based ordered mesoporous carbon and its application in catalytic ammonia decomposition (Chapter4).Fe3O4/ordered mesoporous carbon material was synthesized by hard-template method. We used two steps to synthesize magnetic ordered mesoporous carbon with SBA-15as hard template, sucrose as carbon source and ferric nitrate as the source of iron, which has high specific surface area, regular channel structure and good magnetism. The composite material was used in adsorbing red pigment of traditional chinese medicine. We found that the adsorption material can be quickly separated from a solution under the condition of the additional magnetic field, and the adsorption material shows better adsorption-desorption ability than industrial activated carbon. The saturated adsorption amount is as high as8700mg(safflower)/g.We used short rod-like SBA-15as a template, ionic liquid (1-butylb3-methyl imidazole six fluoride phosphate) as carbon source to synthesize graphitic ordered mesoporous carbon (GMC), which has high specific surface area, the regular channel structure and high graphitic degree. A homogeneous BM1MPF6/GMC composite film was modified on the surface of glassy carbon electrode for simultaneously detection of the catechol (CC) and hydroquinone (HQ). The cyclic voltammetry (CV) of modified electrode showed two couple of independently well-defined quasi-reversibleredox peaks. Compared with GMC/GC modified electrode, the peak current value of GMC/BMIMPF6/GC modified electrode for detecting catechol and hydroquinone increased about three times. DPV showed that the peak current value of cathode was linear with the concentration of HQ in the range of1x10-7to5.0×10-5mol/L in the presence of5×10-5mol/L CC and with the concentration of CC in the range of1x10-7to5.0x10-5mol/L in the presence of5x10-5mol/L HQ with detectionlimits (S/N=3) of5×10-8mol/L(HQ) and6×10-8mol/L (CC), respectively.We used one-step method to synthesize Fe/OMC under the condition without alkali by F127as the template with the adding of1,3,5-trimethylbenzene, resorcinol, hexamine and ferric citrate. We studied the influence of different proportions of TMB/F127on the pore structure and found that ordered mesoporous carbon has the best channel structure when TMB/F127is about0.2. The Fe/OMC composites with different amounts of iron which all exhibite regular channel structure and high graphitic degree. Fe/OMC was used to catalyze the ammonia decomposition conversion. Fe/OMC-0.2has the highest ammonia decomposition activity and the ammonia decomposition conversion rate can reach100%. Fe/OMC-0.2also has good high temperature stability under the condition of0.1g catalyst, ammonia flow rate of36000ml/gcat·min at650℃.