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Time-resolved in situ monitoring of photocatalytic reactions by probe electrospray ionization mass spectrometry.
Analyst ( IF 3.6 ) Pub Date : 2020-03-20 , DOI: 10.1039/d0an00305k
Zhongbao Han 1 , Xiaoyu Gu , Shirong Wang , Liyan Liu , Ying Wang , Zhen Zhao , Zhan Yu
Affiliation  

Probe electrospray ionization mass spectrometry (PESI-MS) has been demonstrated to be a useful in situ and online analytical technique for monitoring of various reactions. In this work, PESI-MS with a surface-modified probe was adopted and applied to in situ monitoring of photocatalytic reactions. Typical reactions of semiconductor photocatalysts, namely TiO2, SnO2, WO3, SiC and ZnS catalyzed methylene blue (MB) and brilliant green (BG) degradation, were selected to demonstrate the potential of PESI-MS to monitor heterogeneous photocatalytic reactions occurring in suspensions. Surface modification of the probe ensures increased wettability during the whole monitoring process. PESI-MS could provide continuous sampling and real-time MS results without time-consuming and cumbersome sample pretreatments. This method has other merits including good reproducibility and stability (time scale > 60 min), convenience of operation, low sample consumption, high time resolution and high tolerance to suspended photocatalyst particles. Time-resolved mass spectra and ion chromatograms of every chemical species e.g. the substrate and reactive intermediates could be obtained, which is helpful for a better understanding of the photocatalytic reaction process. Thus, PESI-MS could be a versatile analytical technique for in situ photocatalytic reaction analysis and could be an alternative means for the evaluation of photocatalyst performance.

中文翻译:

通过探针电喷雾电离质谱技术在时间上就地监测光催化反应。

探针电喷雾电离质谱(PESI-MS)已被证明是一种用于监测各种反应的现场和在线分析技术。在这项工作中,采用具有表面修饰探针的PESI-MS并将其应用于光催化反应的原位监测。选择了半导体光催化剂的典型反应,即TiO2,SnO2,WO3,SiC和ZnS催化的亚甲基蓝(MB)和亮绿色(BG)降解,以证明PESI-MS监测悬浮液中发生的异质光催化反应的潜力。探头的表面改性可确保在整个监测过程中提高润湿性。PESI-MS可以提供​​连续的采样和实时的MS结果,而无需耗时且麻烦的样品预处理。该方法还有其他优点,包括良好的重现性和稳定性(时标> 60分钟),操作方便,样品消耗少,时间分辨率高以及对悬浮的光催化剂颗粒具有较高的耐受性。可以获得每种化学物质(例如底物和反应性中间体)的时间分辨质谱和离子色谱图,这有助于更好地了解光催化反应过程。因此,PESI-MS可能是用于原位光催化反应分析的通用分析技术,并且可能是评估光催化剂性能的另一种方法。可以获得每种化学物质(例如底物和反应性中间体)的时间分辨质谱和离子色谱图,这有助于更好地了解光催化反应过程。因此,PESI-MS可能是一种用于原位光催化反应分析的通用分析技术,并且可能是评估光催化剂性能的另一种方法。可以获得每种化学物质(例如底物和反应性中间体)的时间分辨质谱和离子色谱图,这有助于更好地了解光催化反应过程。因此,PESI-MS可能是一种用于原位光催化反应分析的通用分析技术,并且可能是评估光催化剂性能的另一种方法。
更新日期:2020-03-12
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