摘要
通过超声辅助表面活性剂法,以N-氨乙基-γ-氨丙基三甲氧基硅烷为改性剂,制备了氨基改性层状双氢氧化物(MgAl LDHs)。结合XRD、SEM、TG、EA和XPS等表征手段,探讨了制备过程中不同超声强度对氨基改性LDHs表面形貌等结构的影响,进一步分析了此氨基改性LDHs材料的CO2吸附动力学过程。结果表明,超声辅助处理明显改善了氨基改性LDHs的表面形貌,有效提高了氨基改性LDHs的CO2吸附容量;在30℃,0.1 MPa纯CO2环境下,经195 W超声辅助材料的CO2吸附容量达1.65 mmol·g^-1,比未经超声处理的氨基改性LDHs的CO2吸附容量提高了50%,适度超声辅助处理能有效增强LDHs化学吸附性能。根据双指数动力学模型分析,氨基改性LDHs的CO2吸附受物理吸附和化学吸附两种机理控制,随着超声强度的提高,氨基改性LDHs化学吸附先得到增强,随后是物理吸附,当超声强度过大时,化学吸附受到抑制。
Amine modified layered double hydroxide(LDHs)was prepared by ultrasound assistance using N-aminoethyl-γ-aminopropyltrimethoxysilane as a grafting agent.The materials were characterized by XRD,SEM,TG,EA and XPS.The effects of ultrasonic intensity on the surface morphology of amino-modified LDHs were investigated,and the kinetics of CO2 adsorption was further analyzed.The results indicate that ultrasonic treatment significantly improves the surface morphology of LDHs and increases CO2 adsorption capacity.The CO2 adsorption capacity of the 195 W ultrasonic-assisted material was 1.65 mmol·g^-1 at 30℃and 0.1 MPa,which was 50%higher than that without ultrasonic treatment.Proper ultrasonic intensity can effectively enhance chemical adsorption performance of LDHs.The kinetic model confirms that CO2 adsorption is controlled by both physical and chemical adsorption.With the increase of ultrasonic intensity,chemical adsorption of LDHs was first enhanced by physical adsorption.Chemical adsorption was suppressed when the ultrasonic intensity was too high.
作者
刘秋平
赵雨
王家炜
艾宁
LIU Qiu-ping;ZHAO Yu;WANG Jia-wei;AI Ning(College of Chemical Engineering,Zhejiang University of Technology,Hangzhou 310014,China;Zhejiang Province Key Laboratory of Biomass Fuel,Hangzhou 310014,China;Biodiesel Laboratory of China Petroleum and Chemical Industry Federation,Hangzhou 310014,China;MB124a,Chemical Engineering and Applied Chemistry,Aston University,Aston Triangle,Birmingham B47ET,UK)
出处
《高校化学工程学报》
EI
CAS
CSCD
北大核心
2020年第2期479-486,共8页
Journal of Chemical Engineering of Chinese Universities
基金
浙江省自然科学基金(LY16B060014)
化学工程联合国家重点实验室开放课题(SKL-ChE-11A02)。
关键词
层状双氢氧化物
氨基改性
超声辅助
CO2
吸附
layered double hydroxide
amine modification
ultrasound assist
carbon dioxide
capture
