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.
作者
张馨
郭冀峰
王雯娟
李继香
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)
出处
《化工环保》
CAS
CSCD
北大核心
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)。
关键词
活性炭
疏水改性
高湿环境
甲苯
化学吸附
activated carbon
hydrophobic modification
high humidity environment
toluene
chemical adsorption
