Cargando…
Effects of Ultrasound Pretreatment on Eucalyptus Thermal Decomposition Characteristics As Determined by Thermogravimetric, Differential Scanning Calorimetry, and Fourier Transform Infrared Analysis
[Image: see text] Samples were pretreated by ultrasound at 300 W and 28 kHz in three different solutions. The thermal degradation characteristics of the samples were then characterized via thermogravimetric, differential scanning calorimetry, and Fourier transform infrared analysis in a nitrogen env...
Autores principales: | , , , , |
---|---|
Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
American Chemical Society
2018
|
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6044828/ https://www.ncbi.nlm.nih.gov/pubmed/30023954 http://dx.doi.org/10.1021/acsomega.8b00382 |
_version_ | 1783339551834505216 |
---|---|
author | He, Zhengbin Qian, Jing Wang, Zhenyu Yi, Songlin Mu, Jun |
author_facet | He, Zhengbin Qian, Jing Wang, Zhenyu Yi, Songlin Mu, Jun |
author_sort | He, Zhengbin |
collection | PubMed |
description | [Image: see text] Samples were pretreated by ultrasound at 300 W and 28 kHz in three different solutions. The thermal degradation characteristics of the samples were then characterized via thermogravimetric, differential scanning calorimetry, and Fourier transform infrared analysis in a nitrogen environment. The characteristic of gas product release, the formation mechanisms of the main products, and the mechanistic basis for the effects of ultrasound on wood components were studied. The results showed that the gaseous products are the same with ultrasound pretreatment but the amounts are changed. The gaseous products mainly constitute of CO, H(2)O, CO(2), CH(4), and CH(3)COOH, and more gaseous products were produced at 361 °C than at 308 °C. The reaction rates for specimens pretreated in aqueous soda solution proceeded faster than specimens pretreated in aqueous acetic acid solution and distilled water. Moreover, the maximum FTIR spectra absorbance appeared around 341 °C for specimens pretreated in aqueous soda solution but appeared around 369 °C for the control sample and samples pretreated in distilled water or acetic acid solution. The heat flows for specimens pretreated in aqueous soda solution, compared to control group, was much lower. Additionally, hydroxyl and hydroperoxy radicals provided by ultrasound cavitation in alkaline conditions act to intensify the overall rates of reactions. |
format | Online Article Text |
id | pubmed-6044828 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2018 |
publisher | American Chemical Society |
record_format | MEDLINE/PubMed |
spelling | pubmed-60448282018-07-16 Effects of Ultrasound Pretreatment on Eucalyptus Thermal Decomposition Characteristics As Determined by Thermogravimetric, Differential Scanning Calorimetry, and Fourier Transform Infrared Analysis He, Zhengbin Qian, Jing Wang, Zhenyu Yi, Songlin Mu, Jun ACS Omega [Image: see text] Samples were pretreated by ultrasound at 300 W and 28 kHz in three different solutions. The thermal degradation characteristics of the samples were then characterized via thermogravimetric, differential scanning calorimetry, and Fourier transform infrared analysis in a nitrogen environment. The characteristic of gas product release, the formation mechanisms of the main products, and the mechanistic basis for the effects of ultrasound on wood components were studied. The results showed that the gaseous products are the same with ultrasound pretreatment but the amounts are changed. The gaseous products mainly constitute of CO, H(2)O, CO(2), CH(4), and CH(3)COOH, and more gaseous products were produced at 361 °C than at 308 °C. The reaction rates for specimens pretreated in aqueous soda solution proceeded faster than specimens pretreated in aqueous acetic acid solution and distilled water. Moreover, the maximum FTIR spectra absorbance appeared around 341 °C for specimens pretreated in aqueous soda solution but appeared around 369 °C for the control sample and samples pretreated in distilled water or acetic acid solution. The heat flows for specimens pretreated in aqueous soda solution, compared to control group, was much lower. Additionally, hydroxyl and hydroperoxy radicals provided by ultrasound cavitation in alkaline conditions act to intensify the overall rates of reactions. American Chemical Society 2018-06-20 /pmc/articles/PMC6044828/ /pubmed/30023954 http://dx.doi.org/10.1021/acsomega.8b00382 Text en Copyright © 2018 American Chemical Society This is an open access article published under an ACS AuthorChoice License (http://pubs.acs.org/page/policy/authorchoice_termsofuse.html) , which permits copying and redistribution of the article or any adaptations for non-commercial purposes. |
spellingShingle | He, Zhengbin Qian, Jing Wang, Zhenyu Yi, Songlin Mu, Jun Effects of Ultrasound Pretreatment on Eucalyptus Thermal Decomposition Characteristics As Determined by Thermogravimetric, Differential Scanning Calorimetry, and Fourier Transform Infrared Analysis |
title | Effects of Ultrasound Pretreatment on Eucalyptus Thermal
Decomposition Characteristics As Determined by Thermogravimetric,
Differential Scanning Calorimetry, and Fourier Transform Infrared
Analysis |
title_full | Effects of Ultrasound Pretreatment on Eucalyptus Thermal
Decomposition Characteristics As Determined by Thermogravimetric,
Differential Scanning Calorimetry, and Fourier Transform Infrared
Analysis |
title_fullStr | Effects of Ultrasound Pretreatment on Eucalyptus Thermal
Decomposition Characteristics As Determined by Thermogravimetric,
Differential Scanning Calorimetry, and Fourier Transform Infrared
Analysis |
title_full_unstemmed | Effects of Ultrasound Pretreatment on Eucalyptus Thermal
Decomposition Characteristics As Determined by Thermogravimetric,
Differential Scanning Calorimetry, and Fourier Transform Infrared
Analysis |
title_short | Effects of Ultrasound Pretreatment on Eucalyptus Thermal
Decomposition Characteristics As Determined by Thermogravimetric,
Differential Scanning Calorimetry, and Fourier Transform Infrared
Analysis |
title_sort | effects of ultrasound pretreatment on eucalyptus thermal
decomposition characteristics as determined by thermogravimetric,
differential scanning calorimetry, and fourier transform infrared
analysis |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6044828/ https://www.ncbi.nlm.nih.gov/pubmed/30023954 http://dx.doi.org/10.1021/acsomega.8b00382 |
work_keys_str_mv | AT hezhengbin effectsofultrasoundpretreatmentoneucalyptusthermaldecompositioncharacteristicsasdeterminedbythermogravimetricdifferentialscanningcalorimetryandfouriertransforminfraredanalysis AT qianjing effectsofultrasoundpretreatmentoneucalyptusthermaldecompositioncharacteristicsasdeterminedbythermogravimetricdifferentialscanningcalorimetryandfouriertransforminfraredanalysis AT wangzhenyu effectsofultrasoundpretreatmentoneucalyptusthermaldecompositioncharacteristicsasdeterminedbythermogravimetricdifferentialscanningcalorimetryandfouriertransforminfraredanalysis AT yisonglin effectsofultrasoundpretreatmentoneucalyptusthermaldecompositioncharacteristicsasdeterminedbythermogravimetricdifferentialscanningcalorimetryandfouriertransforminfraredanalysis AT mujun effectsofultrasoundpretreatmentoneucalyptusthermaldecompositioncharacteristicsasdeterminedbythermogravimetricdifferentialscanningcalorimetryandfouriertransforminfraredanalysis |