Adsorption law and influencing mechanism of Cu2+by columnar activated carbon prepared from high-sulfur anthracite
high-sulfur anthracite generates a large amount of sulfur oxides during combustion,causing serious damage to the atmospheric environment.It is necessary to seek a path for its development from traditional fuel to high-end materials with increasingly strict environ-mental requirements.Due to the lack of technical indicators for the preparation and application of activated carbon in specific fields,the preparation goals are unclear,and the targeted preparation of activated carbon is an urgent issue to be addressed.In this study,two types of activated carbon with specific surface areas of 1 066.42 m2/g(AC-1)and 1 568.79 m2/g(AC-2)were obtained by using high-sulfur smokeless coal from Jincheng area,prepared by physical activation and phosphoric acid impregnation.Characterization was performed using FTIR,XPS,SEM,and other methods.The results show that the mesopore volume of AC-1 is 1.688 nm,while that of AC-2 is 0.718 nm,indicating that the former has a more developed mesoporous structure.The adsorption performance of two activated carbons using Cu2+as the adsorbate was studied.The results indicate that the adsorption performance of AC-1 is significantly superior to that of AC-2,and the adsorption behavior is jointly determined by pore size distribution and surface functional group content.The optimal adsorp-tion conditions are found to be pH=4,temperature at 35℃ ,activated carbon dosage of 0.30 g,and adsorption time of 2 hours.Kinetic studies reveal that the adsorption process of both activated carbons for Cu2+is chemisorption rather than intraparticle diffusion-controlled.The fitting results of the adsorption isotherms indicate that the Langmuir isotherm model is not applicable to AC-2,possibly due to its pre-dominance of physical adsorption.In this study,the influence of pore distribution and surface functional group content on the adsorption performance was discussed,providing guidance for the targeted preparation of activated carbon with good water-phase heavy metal ion re-moval capability from high-sulfur smokeless coal.
high sulfur anthracitecoal-based activated carbonpore distributioncopper ion purificationadsorption mechanism
万方数据
