4.8 Article

Formaldehyde emission from wood promoted by lignin in the presence of iron residues

Journal

GREEN CHEMISTRY
Volume 24, Issue 17, Pages 6631-6638

Publisher

ROYAL SOC CHEMISTRY
DOI: 10.1039/d2gc02632e

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Funding

  1. Microbiology department at University of Massachusetts Amherst, USA [S1075 - MAS00503]
  2. Mechanical Engineering Department, University of North Texas, Denton, TX, USA
  3. National Institute of Food and Agriculture, U.S. Department of Agriculture
  4. Center for Agriculture, Food and the Environment at University of Massachusetts Amherst, USA [S1075 - MAS00503]

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This study presents the lignin-mediated Fenton reaction as a newly described mechanism for the generation of formaldehyde from wood. Low levels of iron and lignin in wood were found to promote the generation of formaldehyde.
It is known that wood releases low levels of formaldehyde under natural conditions, but the mechanism for this release has not been well explored. This paper presents the lignin-mediated Fenton (LMF) reaction as a newly described mechanism for the generation of formaldehyde from wood lignin in the presence of iron. Traditional desiccator methods with Nash reagent and fluorescence spectrophotometry, and a commercial electrochemical-based formaldehyde sensor were used to examine the effects of important components in the LMF reaction i.e., iron reductant, hydrogen peroxide and lignin, on the wood formaldehyde emission in the presence of iron. The results showed that low levels of iron, especially in its reduced ferrous oxidation state, promoted the generation of formaldehyde in the presence of lignin in wood. Experiments were also conducted with additional iron reductants and hydrogen peroxide, which demonstrated additional formaldehyde generation in the presence of ferric iron and lignin, suggesting active generation of formaldehyde from wood by the LMF reaction.

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