Preparation And Properties Of Mesoporous Carbon

This study aims to synthesize mesoporous carbon materials by soft template method and modifying mesoporous carbon materials. In order to improve the performance of mesoporous carbon materials, such as conductivity and invasion, experiments are divided into the following three parts:(1) Preparation and electrochemical performance of Ni/N modifying mesoporous carbon with super high specific surface area: three block copolymer(F127) as template agent, resole resin as carbon source, tetraethyl orthosilicate(TEOS) as a structural enhancer, nickel chloride and urea as additives, mesoporous carbon materials with high specific surface area and good electrical conductivity were prepared by evaporation induced self-assembly(EISA). Transmission electron microscopy(TEM), small angle x-ray diffraction(XRD) and nitrogen adsorption were used to characterize structure performance of prepared materials. The results show that mesoporous carbon materials maintained good pore structure after modifying: two-dimensional hexagonal mesoscopic structures with uniform pore size(about 5.3 nm), large pore volume(about 3.80 cm3/g) and high specific surface area(up to 2800 m2/g). The BET specific surface area was contributed by mesoporous structures. Wide-angle XRD and Raman spectrum characterizations prove that the degree of graphite is distinctly improved. The results of wide-angle XRD and atomic absorption spectra show the existence and content of nickel. The electrochemical properties were tested by electrochemical workstation in alkaline electrolyte solution. The results show that CV curve presents a roughly rectangular by different scanning rate, and the maximum specific capacitance up to 210 F/g in alkaline electrolyte solution. Cycle performance was tested, and the material maintained a high capacitance, after 200 times of circular charge and discharge.(2) Preparation and adsorption properties on methyl orange of Fe/N modifying mesoporous carbon: resole phenolic resin as carbon source, three block copolymer(F127) as template agent, ferric nitrate and urea as additives and TEOS structure enhancer. Fe/N modifying mesoporous carbon was prepared by EISA. TEM, nitrogen adsorption and small angle XRD were used to characterize structure performance of prepared materials. The results show that: ordered mesoporous carbon remained better 2D hexagonal structure(p6mm), and invasive can be significantly improved after iron was added. The prepared sample has a larger specific surface area. And the specific surface area could be as high as 1483 m2/g, and both specific surface area and the degree of order decreased with the increase of doping amount of iron. In the experimental adsorption of organic dye methyl orange, the Fe/N modified ordered mesoporous carbon can be 196.76 mg/g of absorbed methyl orange, and the maximum adsorption rate can reach 98.5 %. And the adsorption kinetics and the adsorption equilibrium performance were studied.(3)Study on adsorption capacity of Ni/N modifying ordered mesoporous carbon materials on safflower wastewater solution: the results show that the immersion of ordered mesoporous carbon material was improved after Ni/N modifying. And on the safflower wastewater solution, ordered mesoporous carbon exhibits good adsorption properties. Comparing to the sample of N-OMC, 0.3 Ni-N-OMC has larger adsorption capacity and higher adsorption on safflower wastewater solution and the removal rate, and the maximum adsorption on safflower wastewater solution were 608.7 mg/g and 556.8 mg/g, and the removal rates were 93.8 % and 86.3 %, respectively. Two groups of samples were analyzed by adsorption kinetics of quasi first and quasi second dynamic fitting. The results show that the adsorption process of Ni/N modifying ordered mesoporous carbon material of safflower wastewater was corresponding to adsorption kinetics of first-order kinetic equation. The results of fitting Langmuir and Freundlich adsorption isotherm show that Ni/N modified ordered mesoporous carbon materials adsorbed on safflower wastewater solution fit with the fitting results of Freundlich adsorption isotherm equation. The regeneration experiments indicate that Ni/N modified mesoporous carbon materials on safflower wastewater solution have good performance reuse.