Preparation And Modification Of Porous Carbon For Adsorption

Due to the controllable pore structure and surface chemical properties, porous carbonmaterials are widely used in adsorption, catalysis, electrochemistry and sensor et al.Doping and modification can be effective ways to improve the performance of porouscarbon materials. Nitrogen doping generally could alter the electronic and crystallinestructures of the carbon materials, enhancing the surface polarity and introducing basicactive sites. In this paper, a serious of mesoporous carbon materials was successfullyprepared by using template methods including hard template and soft template. The workis an attempt to explore the synthesis pathways and reaction mechanism in regulating ofthe framework structure, modifying surface and controlling morphology of mesoporouscarbon materials. The acid gas adsorption and methyl orange molecular adsorption on theN-doped or modified mesoporous carbon materials were investigated.Firstly, Ionic liquids/silicon composite materials were obtained by employingtraditional ionic liquids as carbon source, one-pot introducing into the SBA-15precursor.Highly porous N-doped carbon monoliths have been successfully prepared by using[C16Mim]Br as addition, followed by solvent evaporation, thermal polymerization,carbonization and silica etching. The N-doped carbon monoliths displayed a greatpotential to be used for catalyst, adsorption and electrochemical energy storageapplication.We have described a convenient approach to synthesize nitrogen-doped carbonnanospheres by using a soluble urea-phenol-formaldehyde （UPF） resin as the precursorand triblock copolymer F127as a soft template. UPF precursors contained plenty ofhydroxyl groups being hydrophilic to interact and assemble with copolymers, forming aspherical N-containing resol-F127polymer under the low-concentration aqueous solutionconditions. We proposed a low-concentration growth and hydrothermal reactionmechanism to explain the formation of N-doped mesoporous carbon nanospheres. Theobtained carbon spheres were used as adsorbents for acid gas adsorption. The adsorbentsexhibited good capture performances for static CO₂adsorption and dynamic SO₂adsorption.The improvement and designment of the pore structure of WMC, making transportmore convenient and effective is significant. Herein, in this paper, we describe thewormhole-like silica as hard template, copolymer F127as a soft template and TEOS as additive by evaporation-induced organic-organic assembly approach. Adding PluronicF127was favor for generation new mesoporous and introducing thetraethylorthosilicate（TEOS） to creat additional microporous enhancing surface area. Obtained hierarchicalstructure carbon spheres provided rapid mass transport for MO adsorption. The effect ofthe morphology, pore structure and the BET area of WMCs on adsorption were furtherinvestigated. In addition, adsorption isotherm equation and adsorption kinetics modelswere carried out to reveal the adsorption mechanism of MO onto the hierarchical porouscarbon spheres.