Effects of air relative humidity and temperature on photodegradation processes in beech and spruce Wood

L. Tolvaj, Carmen Mihaela Popescu, Zsolt Molnar, Edina Preklet

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

Spruce and beech samples were irradiated by UV light in humid (100% air humidity) and dry conditions to clarify the effects of vapor on photodegradation. UV-irradiated samples were also soaked in distilled water for comparison. The color change and the IR absorption spectra were measured. The wet condition generated considerably greater discoloration than did the dry condition. The intensity of the color change was higher at elevated temperature (53 °C) than at 32 °C. The results showed that the presence of water as vapor increased the degradation of lignin. The nonconjugated carbonyl groups absorbing around 1760 cm-1 were found not to be stable, and the number of these chemical groups decreased in the presence of vapor when compared against the dry condition. The rising temperature amplified this degradation effect.

Original languageEnglish
Pages (from-to)296-305
Number of pages10
JournalBioResources
Volume11
Issue number1
DOIs
Publication statusPublished - 2016

Fingerprint

Photodegradation
photodegradation
relative humidity
Atmospheric humidity
Wood
Vapors
degradation
air
absorption spectrum
Air
lignin
Color
Degradation
Discoloration
humidity
Water
Lignin
temperature
Ultraviolet radiation
water

Keywords

  • Air humidity
  • Color change
  • Photodegradation
  • Wood

ASJC Scopus subject areas

  • Waste Management and Disposal
  • Environmental Engineering
  • Bioengineering

Cite this

Effects of air relative humidity and temperature on photodegradation processes in beech and spruce Wood. / Tolvaj, L.; Popescu, Carmen Mihaela; Molnar, Zsolt; Preklet, Edina.

In: BioResources, Vol. 11, No. 1, 2016, p. 296-305.

Research output: Contribution to journalArticle

Tolvaj, L. ; Popescu, Carmen Mihaela ; Molnar, Zsolt ; Preklet, Edina. / Effects of air relative humidity and temperature on photodegradation processes in beech and spruce Wood. In: BioResources. 2016 ; Vol. 11, No. 1. pp. 296-305.
@article{10186b2237514b3982dd186702234ff6,
title = "Effects of air relative humidity and temperature on photodegradation processes in beech and spruce Wood",
abstract = "Spruce and beech samples were irradiated by UV light in humid (100{\%} air humidity) and dry conditions to clarify the effects of vapor on photodegradation. UV-irradiated samples were also soaked in distilled water for comparison. The color change and the IR absorption spectra were measured. The wet condition generated considerably greater discoloration than did the dry condition. The intensity of the color change was higher at elevated temperature (53 °C) than at 32 °C. The results showed that the presence of water as vapor increased the degradation of lignin. The nonconjugated carbonyl groups absorbing around 1760 cm-1 were found not to be stable, and the number of these chemical groups decreased in the presence of vapor when compared against the dry condition. The rising temperature amplified this degradation effect.",
keywords = "Air humidity, Color change, Photodegradation, Wood",
author = "L. Tolvaj and Popescu, {Carmen Mihaela} and Zsolt Molnar and Edina Preklet",
year = "2016",
doi = "10.15376/biores.11.1.296-305",
language = "English",
volume = "11",
pages = "296--305",
journal = "BioResources",
issn = "1930-2126",
publisher = "North Carolina University",
number = "1",

}

TY - JOUR

T1 - Effects of air relative humidity and temperature on photodegradation processes in beech and spruce Wood

AU - Tolvaj, L.

AU - Popescu, Carmen Mihaela

AU - Molnar, Zsolt

AU - Preklet, Edina

PY - 2016

Y1 - 2016

N2 - Spruce and beech samples were irradiated by UV light in humid (100% air humidity) and dry conditions to clarify the effects of vapor on photodegradation. UV-irradiated samples were also soaked in distilled water for comparison. The color change and the IR absorption spectra were measured. The wet condition generated considerably greater discoloration than did the dry condition. The intensity of the color change was higher at elevated temperature (53 °C) than at 32 °C. The results showed that the presence of water as vapor increased the degradation of lignin. The nonconjugated carbonyl groups absorbing around 1760 cm-1 were found not to be stable, and the number of these chemical groups decreased in the presence of vapor when compared against the dry condition. The rising temperature amplified this degradation effect.

AB - Spruce and beech samples were irradiated by UV light in humid (100% air humidity) and dry conditions to clarify the effects of vapor on photodegradation. UV-irradiated samples were also soaked in distilled water for comparison. The color change and the IR absorption spectra were measured. The wet condition generated considerably greater discoloration than did the dry condition. The intensity of the color change was higher at elevated temperature (53 °C) than at 32 °C. The results showed that the presence of water as vapor increased the degradation of lignin. The nonconjugated carbonyl groups absorbing around 1760 cm-1 were found not to be stable, and the number of these chemical groups decreased in the presence of vapor when compared against the dry condition. The rising temperature amplified this degradation effect.

KW - Air humidity

KW - Color change

KW - Photodegradation

KW - Wood

UR - http://www.scopus.com/inward/record.url?scp=84949871001&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84949871001&partnerID=8YFLogxK

U2 - 10.15376/biores.11.1.296-305

DO - 10.15376/biores.11.1.296-305

M3 - Article

VL - 11

SP - 296

EP - 305

JO - BioResources

JF - BioResources

SN - 1930-2126

IS - 1

ER -