CN107764857A - 一种微热量仪和原位荧光光谱在线联用系统 - Google Patents

一种微热量仪和原位荧光光谱在线联用系统 Download PDF

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CN107764857A
CN107764857A CN201710014300.9A CN201710014300A CN107764857A CN 107764857 A CN107764857 A CN 107764857A CN 201710014300 A CN201710014300 A CN 201710014300A CN 107764857 A CN107764857 A CN 107764857A
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黄在银
李星星
邱江源
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Guangxi University for Nationalities
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N25/00Investigating or analyzing materials by the use of thermal means
    • G01N25/20Investigating or analyzing materials by the use of thermal means by investigating the development of heat, i.e. calorimetry, e.g. by measuring specific heat, by measuring thermal conductivity
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/25Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
    • G01N21/31Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
    • G01N21/314Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry with comparison of measurements at specific and non-specific wavelengths
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/62Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
    • G01N21/63Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light optically excited
    • G01N21/64Fluorescence; Phosphorescence
    • G01N21/645Specially adapted constructive features of fluorimeters
    • G01N21/6456Spatial resolved fluorescence measurements; Imaging
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/25Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
    • G01N21/31Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
    • G01N21/314Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry with comparison of measurements at specific and non-specific wavelengths
    • G01N2021/3155Measuring in two spectral ranges, e.g. UV and visible

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Abstract

本发明涉及一种微热量仪和原位荧光光谱联用系统的研制。整个联用系统由微热量仪、光源、光纤、微型光纤光谱仪和计算机组成。系统工作时,光源产生的光经光纤引入到微热量仪的样品池和参比池,再在样品池通道加载采集入射光与反应体系作用后产生的荧光,并传输至微型光谱仪中进行检测,热信息和光谱信息同时由计算机记录。该系统是一种新的联用系统,适合于光诱导及光引发的化学及物理过程的检测,特别是对化学发光和光化学反应过程的原位热力学、动力学和原位光谱信息的同步测定,将过程热力学、过程动力学和过程光谱之间的相互关联,探索光谱学与热力学的本质联系,推动微量热技术在光谱科学和光化学科学的发展,该技术有望在光化学、光物理、光生物、医药及高分子材料科学中有广泛地应用前景。

Description

一种微热量仪和原位荧光光谱在线联用系统
技术领域
本发明涉及一种微热量仪和原位荧光光谱联用系统的研制。整个联用系统由微量热仪、光源、光纤、微型光纤光谱仪和计算机组成。系统工作时,光源产生的光经光纤引入到微量热仪的样品池和参比池,再在样品池通道加载采集入射光与反应体系作用后产生的荧光,并传输至微型光谱仪中进行检测,热信息和光谱信息同时由计算机记录。该系统是一种新的联用系统,适合于光诱导及光引发的化学及物理过程的检测,特别是对化学发光和光化学反应过程的原位热力学、动力学和原位光谱信息的同步测定,将过程热力学、过程动力学和过程光谱之间的相互关联,探索光谱学与热力学的本质联系,推动微量热技术在光谱科学和光化学科学的发展,该技术有望在光化学、光物理、光生物、医药及高分子材料科学中有广泛地应用前景。
背景技术
在过去几十年以二氧化钛为代表的多种光催化剂相继被开发,但对其催化机理和催化理论的研究相对滞后,难以清晰地认识催化本质等基本科学问题,该复杂的催化过程常被比喻为一个无从打开的黑盒子。因此,发展新的技术手段原位同步研究化学的热力学、动力学和在分子水平变化的机理问题,是破解这个黑盒子最行之有效的途径。近年来,为了实时、在线地示踪趋近催化反应位置和催化反应发生时刻反应体系的微观机制,原位表征催化过程的先进技术取得很大进展,如原位拉曼光谱、原位红外光谱、原位电镜和原位X射线粉末衍射技术等;
基于光源系统和微热量仪的光化学-微热量系统(光量热仪,Photocalorimetry)无疑提供了研究光化学反应原位过程的新科学方法,该方法实时、无损伤且直观地获取其热动力学精细信息[a) 李星星, 范高超, 马昭, 谭学才, 黄在银. 可见光驱动Ag@AgCl催化反应的原位微量热研究[J]. 中国科学: 化学, 2014(10): 1576-1584. b)X. X. Li, Z. Y.Huang, Z. J. Liu, K. S. Diao, G. C. Fan, Z. Huang, X. C. Tan. In situphotocalorimetry: An alternative approach to study photocatalysis by tracingheat changes and kinetics[J]. Applied Catalysis B: Environmental, 2016, 181,79 ]。光化学-微热量系统可以获取光催化反应中的热谱曲线,从而示踪催化过程的原位热力学信息和动力学信息,同步地将反应的原位过程、降解速率与原位热力学关联;
尽管用于液体体系的光量热计很早就被报道,但近年来由于受限于加工技术一直未得到真正的发展,而有关光化学-微热量系统与其他研究技术的联用更为罕见报道。因此,以光化学-微热量系统研究光化学及光物理等的热力学和原位光谱获取微观动力学构建联用系统意义重大。该联用系统旨在提供一种耦合热力学和光谱学认识光化学微观机制的原位联用技术,将过程热力学、过程动力学和过程光谱之间的相互关联,探索光谱学与热力学的本质联系,推动微量热技术在光谱科学和光化学科学的发展,该技术有望在光化学、光物理、光生物、医药及高分子材料科学中有广泛地应用前景。
发明内容
本发明的目的是提供一种微热量仪和原位荧光在线联用的仪器系统,其各项性能指标符合定量分析要求。
本发明是通过下述方案实现的。它包括光源(1)、光纤(2)、微热量仪(3)、微型光纤光谱仪(9)和计算机(11)。其连接方式是:光源(1)产生的光分别连接至微热量仪(3)中的样品池(4)和参比池(5),样品池(4)的光纤(8)连接光纤光谱仪(9)的入射接口,微量热仪(3)和光纤光谱仪(9)同时与计算机(11)连接。样品池通道(6)由两根直径1 cm 光纤束组成,其中各含50根直径为10 um、长1.5 m的玻璃光纤;一个光纤束用于引入光源(1)产生的入射光,另一根光纤(7)用于收集样品池(4)产生的光谱信息至光纤光谱仪(9)。参比池通道(7)由一根直径1 cm 光纤束组成,其中含50根直径为10 um、长1.5 m的玻璃光纤,用于将光源(1)产生的光引入至参比池(5)。
本发明的优点是设计新颖,连接巧妙,检测灵敏度高,检测限底,控温精确,同时获取光化学及光催化过程原位热力学、动力学和反应体系物质转化的光谱信息,即以光化学-微热量系统研究光化学及光物理等的热力学和原位光谱获取微观动力学,旨在提供一种耦合热力学和光谱学认识光化学微观机制的原位联用技术。同时可用于研究温度、光强和入射光波长等对光化学过程的原位热力学、动力学及机理的影响;程序升温,确定体系最佳反应温度;测定不同单色光)的光催化量子效率;同时获取该光催化过程的三维荧光和原位热力学、动力学精细信息,分析讨论催化机理。
附图说明
附图为微热量仪和原位荧光在线联用的仪器系统
具体实施方式
现结合附图对本发明的技术特征进行详细描述。本发明主要包括它包括光源(1)、光纤(2)、微热量仪(3)、微型光纤光谱仪(9)和计算机(11)。系统工作时,样品池中加入2 mL(V1) 0.006 M的草酸铁钾([Fe(C2O4)3]3-)溶液,参比池中加入2 mL去离子水。然后在25℃条件下,设置参数并在基线平稳后打开光源,光源(1)产生的光分别连接至微热量仪(3)中的样品池(4)和参比池(5),样品池(4)的光纤(8)连接光纤光谱仪(9)的入射接口,通过测定草酸铁钾在可见光的光解焓对仪器性能指标进行评定。
光照一定时间后,1 mL(V2)光照溶液注入10 mL(V3)容量瓶中,再加入0.5 mL HAc-NaAc缓冲溶液和4 mL 1,10-邻菲咯啉(0.1%)混合溶液,并用去离子水稀释至刻度线。避光放置至少30 min形成配合物。对于光照时间为25 min时,考虑到朗伯-比尔定律的适用条件,避免浓度过大导致紫外可见光吸收光谱不符合朗伯-比尔定律,取0.5 mL(V2)光照溶液注入10 mL(V3)容量瓶中,在加入0.25 mL HAc-NaAc缓冲溶液和2 mL 1,10-邻菲咯啉(0.1%)混合溶液,并用去离子水稀释至刻度线,避光放置至少30 min充分配位显色。参比池中在不光照条件下重复上述操作。生成的Fe2+摩尔量可以计算如下:
,
其中A:样品池和参比池中配合物在510nm的吸光度之差;ε为亚铁离子络合物在510nm处的吸收常数(11100 L·mol-1·cm-1);b为光程,即紫外可见光光度计的透光厚度(1.0cm)。
在25℃下,草酸铁钾([Fe(C2O4)3]3-)光解时的标准摩尔反应焓的计算如下式:
其中Q为LED光量计中显示出的草酸铁钾([Fe(C2O4)3]3-)光解热;n(Fe2+)为Fe2+物质的量。
根据草酸铁钾光催化反应的热流曲线和紫外可见光谱吸收图可得其标准摩尔反应焓,标准摩尔反应焓为(-57.7316±3.062) kJ·mol-1,与文献[Adamson, A. W.,Vogler, A., Kunkely, H. Photocalorimetry enthalpies of photolysis of trans-azobenzene, ferrioxalate and cobaltioxalate ions, chromium hexacarbonyl, anddirhenium decarbonyl. Journal of The American Chemical Society, 1978, 100(4):1298-1300]中的(-53.5808±2.9300) kJ·mol-1相近,说明联用系统的是科学性和合理性。
25℃草酸铁钾光分解的标准摩尔反应焓

Claims (3)

1.一种微热量仪和原位荧光光谱在线联用系统,其特征在于:它包括光源(1)、光纤(2)、微热量仪(3)、微型光纤光谱仪(9)和计算机(11);其连接方式是:光源(1)产生的光分别连接至微热量仪(3)中的样品池(4)和参比池(5),样品池(4)的光纤(8)连接光纤光谱仪(9)的入射接口,微量热仪(3)和光纤光谱仪(9)同时与计算机(11)连接。
2. 按照权利1所述的微热量仪和荧光光谱在线联用系统,其特征在于:样品池通道(6)由两根直径1 cm 光纤束组成,其中各含50根直径为10 um、长1.5 m的玻璃光纤;一个光纤束用于引入光源(1)产生的入射光,另一根光纤(7)用于收集样品池(4)产生的光谱信息至光纤光谱仪(9)。
3. 按照权利1所述的微热量仪和荧光光谱在线联用系统,其特征在于:参比池通道(7)由一根直径1 cm 光纤束组成,其中含50根直径为10 um、长1.5 m的玻璃光纤,用于将光源(1)产生的光引入至参比池(5)。
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JPS6080748A (ja) * 1983-10-08 1985-05-08 Shinku Riko Kk 熱容量変化及び熱重量変化の同時測定装置
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