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Pt/TiO2-ZnO in a circuit Photo-electro-catalytically removed HCHO for outstanding indoor air purification
- Source :
- Separation and Purification Technology. 206:316-323
- Publication Year :
- 2018
- Publisher :
- Elsevier BV, 2018.
-
Abstract
- HCHO removal from indoor air was usually slow and inefficient due to the low concentration but persistent release, inadequate oxidation and less efficient catalysts at room temperature. PEC (photo-electro-catalysis) can better remove pollutant than PC (photocatalysis) or EC (electro-catalysis), but was rarely used directly in indoor air purification, because often aqueous electrolyte was not considered in indoor air purification reactor. Theoretically, removing HCHO in indoor air by PEC is possible, the question is how to integrate gas phase reaction with electric field and electrolyte. In this article, using copper anode in a thin film liquid electrolyte and high activity Pt/TiO2-ZnO cathode, efficient HCHO removal was realized by photo-electro-catalytic oxidation. The nano catalyst was prepared by sol-gel method and loaded on stainless steel mesh as cathode. Its structure, morphology and photocatalytic properties were characterized. The effect of Pt loading and/or external resistances on the removal efficiencies were investigated. Within 120 min of reaction time, 74% HCHO (0.16 mg/m3, in 5.56 10−3 m3 air volume) was removed using 36 cm2 cathode loaded with 4.16 10−3 mg/cm2 catalyst, while only 42% and 53% was removed respectively in PC and EC using the same catalyst and reactor.
- Subjects :
- Pollutant
Materials science
Indoor air
Filtration and Separation
02 engineering and technology
Electrolyte
010402 general chemistry
021001 nanoscience & nanotechnology
01 natural sciences
Cathode
0104 chemical sciences
Analytical Chemistry
law.invention
Catalysis
Chemical engineering
law
Electric field
Photocatalysis
Thin film
0210 nano-technology
Subjects
Details
- ISSN :
- 13835866
- Volume :
- 206
- Database :
- OpenAIRE
- Journal :
- Separation and Purification Technology
- Accession number :
- edsair.doi...........d61053a8da32a435204c0d94f16b04a5