改性介孔碳和活性炭在废水吸附实验中的对比研究

Comparative research on modified mesoporous carbon and activated carbon in wastewater adsorption experiments

采用软模板法合成介孔碳(MC)并对其N改性合成氮改性介孔碳(NMC),进行了N2吸-脱附和FTIR表征分析,考察MC和NMC对废水中双酚A(BPA)的吸-脱附性能并与活性炭(AC)进行对比。结果:MC与NMC的比表面积分别为687.8m^2/g和579.6m^2/g;一定条件下,平衡吸附量与BPA初始浓度呈正相关,与吸附剂的量呈负相关,pH值为3~8时有利于对BPA的吸附,相同条件下NMC平衡吸附量高于MC;吸附动力学模型以准二级动力学为主,Freundlich模型更能有效反映吸附行为,以低温有利自发进行的物理吸附为主;与活性炭(AC)相比,NMC和MC吸附效果及循环再生稳定性更好。

By using the soft template method,mesoporous carbon（MC）is synthetized and its N is modified to synthetize the nitrogen modified mesoporous carbon（NMC）.The analysis is carried out on the characterization of the N2 adsorption from FT-IR.The adsorption properties of bisphenol A（BPA）from wastewater by MC and NMC are investigated and compared with the activated carbon（AC）.The results show that the specific surface area of MC and NMC are 687.8 m^2/g and 579.6 m^2/g.Under a certain condition,the equilibrium adsorption capacity is positively correlated with the initial concentration,and negatively correlated with the amount of the adsorbent.The pH value of 3-8 is conducive to the adsorption of BPA on MC and NMC.However,the equilibrium adsorption capacity of NMC under the same conditions is higher than that of MC.Pseudo-second order kinetic model and Freundlich model can reflect adsorption behavior more effectively with lower temperature facilitating spontaneous physical adsorption.Compared with activated carbon（AC）,MC and NMC show a higher adsorption effect and more stable recycling performance.