DOI: 10.1016/j.atmosenv.2014.09.078
Scopus记录号: 2-s2.0-84908012605
论文题名: Partially-irreversible sorption of formaldehyde in five polymers
作者: Ye W ; , Cox S ; S ; , Zhao X ; , Frazier C ; E ; , Little J ; C
刊名: Atmospheric Environment
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2014
卷: 99 起始页码: 288
结束页码: 297
语种: 英语
英文关键词: ATR-FTIR
; Chemisorption
; Extraction
; Physisorption
; Polycarbonate
; Statistical physics
Scopus关键词: Extraction
; Physisorption
; Polycarbonates
; ATR FTIR
; Statistical physics
; Chemisorption
; aliphatic carboxylic acid
; formaldehyde
; paraformaldehyde
; poly(methyl methacrylate)
; polycarbonate
; polyethylene derivative
; polypropylene
; polystyrene
; air quality
; FTIR spectroscopy
; indoor air
; mass transfer
; polymer
; reaction kinetics
; sorption
; statistical analysis
; air
; Article
; attenuated total reflectance Fourier transform infrared spectroscopy
; chemical procedures
; desorption
; exposure
; extraction
; film
; fluorometry
; Fourier transform infrared photoacoustic spectroscopy
; high temperature
; mass
; molecular mechanics
; oxidation
; physical phenomena
; polymerization
; sorption
; sorption desorption test
; surface property
Scopus学科分类: Environmental Science: Water Science and Technology
; Earth and Planetary Sciences: Earth-Surface Processes
; Environmental Science: Environmental Chemistry
英文摘要: Due to its environmental ubiquity and concern over its potential toxicity, the mass-transfer characteristics of formaldehyde are of critical importance to indoor air quality research. Previous studies have suggested that formaldehyde mass transfer in polymer is partially irreversible. In this study, mechanisms that could cause the observed irreversibility were investigated. Polycarbonate and four other polymeric matrices were selected and subjected to formaldehyde sorption/desorption cycles. Mass transfer of formaldehyde was partially irreversible in all cases, and three potential mechanisms were evaluated. First, attenuated total reflectance Fourier transform infrared spectroscopy (ATR-FTIR) analysis was used to investigate possible formaldehyde polymerization on polymer surfaces. ATR-FTIR showed no detectable paraformaldehyde or formaldehyde on the film surfaces that had been exposed to formaldehyde and air. ATR-FTIR did detect aliphatic acids suggesting oxidation had occurred on film surfaces as a result of exposure to formaldehyde. However, additional study suggested that air is not the primary cause for irreversibility. Second, statistical physics theory was tested as a possible explanation. According to this theory, reversible and irreversible sorption could be taking place simultaneously. The irreversible fraction should be constant during sorption and the fraction could be determined by performing a complete sorption/desorption test. The sorption/desorption data was consistent with this theory. Third, chemisorption was considered as another possible cause for irreversibility. Extraction/fluorimetry testing of post-sorption and post-desorption polymer films showed measurable quantities of formaldehyde suggesting that some of the chemisorbed formaldehyde was reversible at the higher extraction temperature. Further quantitative study on chemical reaction products is needed. © 2014 Elsevier Ltd.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/80605
Appears in Collections: 气候变化事实与影响
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作者单位: Department of Civil and Environmental Engineering, Virginia Tech, Blacksburg, VA, United States; School of Mechanical Engineering, Tongji University, Shanghai, China; Department of Sustainable Biomaterials, Virginia Tech, Blacksburg, VA, United States
Recommended Citation:
Ye W,, Cox S,S,et al. Partially-irreversible sorption of formaldehyde in five polymers[J]. Atmospheric Environment,2014-01-01,99