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On-surface photocatalytic degradation of methylene blue: In situ monitoring by paper spray ionization mass spectrometry
- Source :
- International Journal of Mass Spectrometry. 418:107-111
- Publication Year :
- 2017
- Publisher :
- Elsevier BV, 2017.
-
Abstract
- On-surface photocatalytic degradation of Methylene Blue was conducted on a paper surface and the process continuously monitored using paper spray ionization mass spectrometry. Firstly, the photocatalyst (TiO2) was immobilized on the paper surface, which was later cut in a triangle shape. A small amount of an aqueous solution of the dye Methylene Blue, used as a prototype target, was then added to the paper and the system exposed to UV-C radiation. Control experiments (photolysis) were also conducted, in which the paper surface contained no TiO2. All the processes were analyzed by paper spray mass spectrometry using lidocaine as internal standard, which was added to the paper just before analyzes. By measuring the intensities of the ions of m/z 284 (cationic Methylene Blue) and m/z 235 (protonated lidocaine) the performance of both processes (on-surface photocatalysis and photolysis) were compared. Photocatalysis showed a remarkable superior performance to degrade Methylene Blue in comparison to photolysis. The absorption of UV-C radiation by TiO2 probably generated reactive species on the paper surface that caused faster dye degradation. In conclusion, paper spray ionization mass spectrometry proved to be a convenient platform where on-surface reactions can be promptly investigated.
- Subjects :
- Aqueous solution
Photodissociation
Analytical chemistry
Cationic polymerization
02 engineering and technology
010402 general chemistry
021001 nanoscience & nanotechnology
Condensed Matter Physics
Mass spectrometry
Photochemistry
01 natural sciences
0104 chemical sciences
chemistry.chemical_compound
chemistry
Photocatalysis
Degradation (geology)
Physical and Theoretical Chemistry
Absorption (chemistry)
0210 nano-technology
Instrumentation
Spectroscopy
Methylene blue
Subjects
Details
- ISSN :
- 13873806
- Volume :
- 418
- Database :
- OpenAIRE
- Journal :
- International Journal of Mass Spectrometry
- Accession number :
- edsair.doi...........c9bd40c3dbf13258d88aed53890aad5e