Changes in Chemical and Thermal Properties of Bamboo after Delignification Treatment
Bamboo delignification is a common method for studying its functional value-added applications. In this study, bamboo samples were delignified by treatment with sodium chlorite. The effects of this treatment on the bamboo’s microstructure, surface chemical composition, and pyrolysis behaviour were e...
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| Format: | Article |
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MDPI AG
2022-06-01
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| Series: | Polymers |
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| Online Access: | https://www.mdpi.com/2073-4360/14/13/2573 |
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| author | Huiling Yu Chengsheng Gui Yaohui Ji Xiaoyan Li Fei Rao Weiwei Huan Luming Li |
| author_facet | Huiling Yu Chengsheng Gui Yaohui Ji Xiaoyan Li Fei Rao Weiwei Huan Luming Li |
| author_sort | Huiling Yu |
| collection | DOAJ |
| description | Bamboo delignification is a common method for studying its functional value-added applications. In this study, bamboo samples were delignified by treatment with sodium chlorite. The effects of this treatment on the bamboo’s microstructure, surface chemical composition, and pyrolysis behaviour were evaluated. Field-emission scanning electron microscopy (FE-SEM), Fourier-transform infrared (FTIR) spectroscopy, X-ray photoelectron spectroscopy (XPS), and X-ray diffraction (XRD) were conducted to evaluate these parameters. The FTIR results demonstrated that the lignin peak decreased or disappeared, and some hemicellulose peaks decreased, indicating that sodium chlorite treatment effectively removed lignin and partly decomposed hemicellulose, although cellulose was less affected. The XPS results showed that, after treatment, the oxygen-to-carbon atomic ratio of delignified bamboo increased from 0.34 to 0.45, indicating a lack of lignin. XRD revealed increased crystallinity in delignified bamboo. Further pyrolysis analysis of treated and untreated bamboo showed that, although the pyrolysis stage of the delignified bamboo did not change, the maximum thermal degradation rate (R<sub>max</sub>) and its corresponding temperature (from 353.78 to 315.62 °C) decreased significantly, indicating that the pyrolysis intensity of the bamboo was weakened after delignification. Overall, this study showed that delignified bamboo develops loose surfaces, increased pores, and noticeable fibres, indicating that alkali-treated bamboo has promising application potential due to its novel and specific functionalities. |
| first_indexed | 2024-03-09T12:38:48Z |
| format | Article |
| id | doaj.art-593785337d044016adcdb9a43c321054 |
| institution | Directory Open Access Journal |
| issn | 2073-4360 |
| language | English |
| last_indexed | 2024-03-09T12:38:48Z |
| publishDate | 2022-06-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Polymers |
| spelling | doaj.art-593785337d044016adcdb9a43c3210542023-11-30T22:20:50ZengMDPI AGPolymers2073-43602022-06-011413257310.3390/polym14132573Changes in Chemical and Thermal Properties of Bamboo after Delignification TreatmentHuiling Yu0Chengsheng Gui1Yaohui Ji2Xiaoyan Li3Fei Rao4Weiwei Huan5Luming Li6College of Engineering, Yantai Nanshan University, Yantai 265713, ChinaZhejiang Shenghua Yunfeng New Material Co., Ltd., Huzhou 313200, ChinaResearch Institute of Wood Industry, Chinese Academy of Forestry, Beijing 100091, ChinaChina National Bamboo Research Center, Department of Efficient Utilization of Bamboo and Wood, Wenyi Road 310, Hangzhou 310012, ChinaSchool of Art and Design, Zhejiang Sci-Tech University, Hangzhou 310018, ChinaCollege of Chemistry and Materials Engineering, Zhejiang A&F University, Hangzhou 311300, ChinaCollege of Chemistry and Materials Engineering, Zhejiang A&F University, Hangzhou 311300, ChinaBamboo delignification is a common method for studying its functional value-added applications. In this study, bamboo samples were delignified by treatment with sodium chlorite. The effects of this treatment on the bamboo’s microstructure, surface chemical composition, and pyrolysis behaviour were evaluated. Field-emission scanning electron microscopy (FE-SEM), Fourier-transform infrared (FTIR) spectroscopy, X-ray photoelectron spectroscopy (XPS), and X-ray diffraction (XRD) were conducted to evaluate these parameters. The FTIR results demonstrated that the lignin peak decreased or disappeared, and some hemicellulose peaks decreased, indicating that sodium chlorite treatment effectively removed lignin and partly decomposed hemicellulose, although cellulose was less affected. The XPS results showed that, after treatment, the oxygen-to-carbon atomic ratio of delignified bamboo increased from 0.34 to 0.45, indicating a lack of lignin. XRD revealed increased crystallinity in delignified bamboo. Further pyrolysis analysis of treated and untreated bamboo showed that, although the pyrolysis stage of the delignified bamboo did not change, the maximum thermal degradation rate (R<sub>max</sub>) and its corresponding temperature (from 353.78 to 315.62 °C) decreased significantly, indicating that the pyrolysis intensity of the bamboo was weakened after delignification. Overall, this study showed that delignified bamboo develops loose surfaces, increased pores, and noticeable fibres, indicating that alkali-treated bamboo has promising application potential due to its novel and specific functionalities.https://www.mdpi.com/2073-4360/14/13/2573chemical changethermal propertybamboodelignificationpyrolysisbamboo microstructure |
| spellingShingle | Huiling Yu Chengsheng Gui Yaohui Ji Xiaoyan Li Fei Rao Weiwei Huan Luming Li Changes in Chemical and Thermal Properties of Bamboo after Delignification Treatment Polymers chemical change thermal property bamboo delignification pyrolysis bamboo microstructure |
| title | Changes in Chemical and Thermal Properties of Bamboo after Delignification Treatment |
| title_full | Changes in Chemical and Thermal Properties of Bamboo after Delignification Treatment |
| title_fullStr | Changes in Chemical and Thermal Properties of Bamboo after Delignification Treatment |
| title_full_unstemmed | Changes in Chemical and Thermal Properties of Bamboo after Delignification Treatment |
| title_short | Changes in Chemical and Thermal Properties of Bamboo after Delignification Treatment |
| title_sort | changes in chemical and thermal properties of bamboo after delignification treatment |
| topic | chemical change thermal property bamboo delignification pyrolysis bamboo microstructure |
| url | https://www.mdpi.com/2073-4360/14/13/2573 |
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