疏水活性炭的制备及其在高湿环境下的甲苯吸附性能  

Preparation of hydrophobic activated carbon and its adsorption properties to toluene under high humidity environment

作　　者：张馨 郭冀峰[1] 王雯娟[2] 李继香[2,3] ZHANG Xin;GUO Jifeng;WANG Wenjuan;LI Jixiang(Key Laboratory of Subsurface Hydrology and Ecological Effect in Arid Region,Ministry of Education,School of Water and Environment,Chang’an University,Xi’an 710054,China;Shanghai Advanced Research Institute,Chinese Academy of Sciences,Shanghai 201210,China;University of Chinese Academy of Sciences,Beijing,100049,China)

机构地区：[1]长安大学水利与环境学院,旱区地下水文与生态效应教育部重点实验室,陕西西安710054 [2]中国科学院上海高等研究院,上海201210 [3]中国科学院大学,北京100049

出　　处：《化工环保》2021年第5期630-635,共6页Environmental Protection of Chemical Industry

基　　金：国家重点研发计划项目(2017YFE0116300);国家自然科学基金项目(51878646);中国科学院青年创新促进会会员项目(2017353);陕西省自然科学基础研究计划项目(2019JM-429)。

摘　　要：以三甲基氯硅烷(TMCS)为改性剂,采用液相浸渍和热处理相结合的方式对活性炭进行疏水改性,并采用动态吸附法结合表征技术探究了其在高湿环境下对甲苯的吸附性能和机理。液相浸渍TMCS可有效提高活性炭的疏水性,但会严重堵塞孔道,通过热处理进一步提高疏水性的同时可有效恢复堵塞孔道。改性前后活性炭的甲苯穿透曲线均符合Yoon-Neslon模型。活性炭的疏水改性增强了甲苯与活性炭疏水表面的化学键合作用力,有效提高了对甲苯的吸附选择性。化学吸附是高湿环境下甲苯吸附性能显著提升的主要机制。Activated carbon(AC)was hydrophobically modified by a combination of liquid phase impregnation and heat treatment using trimethylchlorosilane(TMCS)as modifier.Its adsorption performance and mechanism to toluene under high humidity environment were investigated by dynamic adsorption experiments and characterization technologies.The results show that TMCS liquid phase impregnation modification can effectively enhance the hydrophobicity of AC,but will seriously block the pores of AC.The heat treatment can further enhance the hydrophobicity of AC and restore the blocked pores.The toluene penetration curves of AC before and after modification are consistent with Yoon-Neslon model.Hydrophobic modification strengthens the chemical bonding force between toluene and the hydrophobic surface of AC,and effectively improves the adsorption selectivity to toluene.Chemical adsorption is the main mechanism of toluene adsorption significantly improved under a high humidity environment.

关 键 词：活性炭 疏水改性 高湿环境 甲苯 化学吸附 

分 类 号：X701[环境科学与工程—环境工程]