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超快吸附过程太赫兹时间分辨光谱表征与评价

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挥发性有机物(VOCs)污染防治是国家环境保护和人群健康防护的迫切需求,吸附法被认为是最有效的VOCs处理方法之一.当前吸附机理认知存在局限性,阻碍了其工业应用,探明微观吸附机理是实现高效处理VOCs急需解决的关键问题.现有常规微观吸附特征表征方法无法直接实时监测超快吸附现象,需要不断发展新理论、新技术.近年来,太赫兹波在表征吸附过程方面展现出巨大潜力:吸附过程中弱相互作用(范德华力、氢键)的振动模式均在太赫兹波段,化学键断裂与生成引起的表界面移动载流子变化随浓度不同太赫兹响应特征不同,利用太赫兹波谱光学参量(吸收峰、幅值、波形等)在表征吸附特征方面取得了重要进展.吸附过程中化学键的断裂、生成均在皮秒量级,太赫兹波因时间分辨率局限性无法直接获取亚飞秒时间尺度下的有效信息.太赫兹时间分辨光谱在超快过程监测领域的不断突破,在时间尺度上满足了探究超快吸附过程的需求,为揭示微观吸附机理奠定了基础.详细介绍了吸附特征太赫兹波谱表征与评价的研究进展,总结了近几年太赫兹时间分辨光谱在表征超快过程方面的突破性研究,最后提出了太赫兹时间分辨光谱在超快吸附领域的发展方向和面临的主要挑战.
Evaluating Ultrafast Adsorption Process With Terahertz Time-Resolved Spectroscopy
Volatile organic compounds(VOCs)pollution prevention is an urgent demand for national environmental protection and public health.Adsorption is one of the most effective methods to control VOC pollution.Current understanding of the adsorption mechanism is limited,which hinders its industrial application.Identifying the microscopic adsorption mechanism is a key issue that needs to be urgently addressed for the efficient treatment of VOCs.Existing conventional methods to characterize microscopic adsorption cannot directly monitor ultrafast adsorption in real-time.New theories and techniques need to be constantly developed.In recent years,terahertz waves have shown great potential in characterizing adsorption processes.Weak interactions in the adsorption process include van der Waals forces and hydrogen bonds,whose vibrational modes are in the THz band.The surface interface mobility carrier changes due to bond breaking and formation have different THz response characteristics for different concentrations.Optical parameters of THz spectra,such as absorption peaks,amplitudes,and waveforms,have been used to characterize adsorption properties.The breaking and formation of chemical bonds in the adsorption process is on the order of picoseconds.Effective information on the femtosecond timescale is not directly available due to the limitation of the THz time resolution.Continued breakthroughs in terahertz time-resolved spectroscopy in ultrafast process monitoring satisfy the need to explore ultrafast adsorption processes on time scales and lay the foundation for uncovering microscopic adsorption mechanisms.This paper reviewed adsorption law studied by terahertz waves,and ultrafast processes were researched using terahertz time-resolved spectroscopy in recent years.Finally,the development directions and major challenges of terahertz time-resolved spectroscopy in ultrafast adsorption are proposed.

Volatile organic compoundsAdsorptionTerahertz time-resolved spectroscopyMicroscopic mechanism

史昕哲、祝静、刘晓飞、王帅、祝连庆

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北京信息科技大学光电测试技术及仪器教育部重点实验室,北京 100192

北京信息科技大学光纤传感与系统北京实验室,北京 100016

北京信息科技大学光电测量技术北京市重点实验室,北京 100192

广州南沙紫溪智能感知研究院,广州南沙 511462

合肥工业大学仪器科学与光电工程学院,安徽合肥 230009

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挥发性有机物 吸附 太赫兹时间分辨光谱 微观机理

北京市教育委员会科学研究计划项目北京市教育委员会科学研究计划项目北京市教育委员会科学研究计划项目第八届青托工程项目国家自然科学基金青年科学基金项目国家自然科学基金青年科学基金项目

KM202211232017KM202211232001KM2022112320182022QNRC0016210503662105038

2024

10.3964/j.issn.1000-0593(2024)09-2401-11

光谱学与光谱分析
中国光学学会

光谱学与光谱分析

CSTPCD北大核心
影响因子：0.897
ISSN：1000-0593
年,卷(期)：2024.44(9)