接枝内酯基活性炭增强苯乙烯吸附性能研究
Enhanced Styrene Adsorption by Grafted Lactone-based Activated Carbon
吴光宇 1舒松 1张洪伟 1李建军2
作者信息
- 1. 四川大学 建筑与环境学院, 成都 610000;国家烟气脱硫工程技术研究中心, 成都 610000
- 2. 四川大学 建筑与环境学院, 成都 610000;四川大学 碳中和未来技术学院, 成都 610000
- 折叠
摘要
活性炭以其丰富的孔道结构和高比表面积而在吸附苯乙烯废气上具有巨大的应用潜力,然而含氧官能团对弱极性苯乙烯的吸附作用机理尚未明晰.本研究通过酸浸渍法制备改性活性炭AC-S和AC-N,探究改性活性炭孔径结构、比表面积和含氧官能团的演变规律及其对苯乙烯吸附性能的影响.结果表明,酸改性可以明显提高活性炭对苯乙烯的吸附量.通过吸附动力学、吸附等温拟合发现,活性炭改性前后均受物理吸附与化学吸附的复合作用影响,改性后活性炭更倾向于单层吸附.HNO3 改性活性炭(AC-N)的孔隙结构在苯乙烯有效吸附孔径范围内没有显著改变,表面含氧官能团含量增加提高了AC-N对苯乙烯的吸附性能.表面含氧官能团分析表明,内酯基是提高改性活性炭对苯乙烯吸附量的关键因素.密度泛函理论(DFT)计算表明,AC-N上的内酯基官能团与苯乙烯的乙烯基产生强相互作用,增强了苯乙烯在改性活性炭上的吸附.
Abstract
Activated carbon's porous nature and high specific surface area make it an effective tool for adsobing waste gas containing styrene.However,the mechanism by which oxygen-containing functional groups adsorb weak-polar styrene remains unclear.This study described the preparation of the modified activated carbon materials AC-S and AC-N using the acid leaching method.The pore structure and specific surface area of modified activated carbon,the evolution of oxygen-containing functional groups,and their impact on the styrene-adsorbing performance were investigated.The results demonstrated that acid modification significantly improved the styrene-adsorbing capacity of activated carbon.Physical and chemical adsorption impacted both modified and unmodified activated carbon materials,as determined by the adsorption kinetics studies and isotherm fitting analyses.Monolayer adsorption was more likely to occur on modified activated carbon.HNO3-modified activated carbon(AC-N)maintained its effective styrene adsorption pore size range.The increasing number of oxygen-containing functional groups on the surface improved the styrene adsorption performance of AC-N.Study of oxygen-containing functional groups on the surface revealed that lactone group was a key factor in improving the modified activated carbon's ability to adsorb styrene.Density functional theory(DFT)calculations showed that lactone group on AC-N strongly interacted with the vinyl group in styrene,thereby enhancing the styrene adsorption performance of modified activated carbon.
关键词
活性炭/吸附/苯乙烯/含氧官能团/密度泛函理论(DFT)Key words
activated carbon/adsorption/styrene/oxygen-containing functional group/density functional theory(DFT)引用本文复制引用
基金项目
四川省重点研发计划(2023YFS0354)
出版年
2024
国家科技期刊平台
NSTL
万方数据