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Article

Rice Husk Hydrolytic Lignin Transformation in Carbonization Process

by
Svetlana Yefremova
1,*,
Abdurassul Zharmenov
1,
Yurij Sukharnikov
1,
Lara Bunchuk
1,
Askhat Kablanbekov
1,
Kuanish Anarbekov
1,
Tetiana Kulik
2,
Alina Nikolaichuk
2 and
Borys Palianytsia
2
1
National Center on Complex Processing of Mineral Raw Material of the Republic of Kazakhstan RSE, Almaty 050036, Kazakhstan
2
Chuiko Institute of Surface Chemistry National Academy of Sciences of Ukraine, Kiyv 03164, Ukraine
*
Author to whom correspondence should be addressed.
Molecules 2019, 24(17), 3075; https://doi.org/10.3390/molecules24173075
Submission received: 28 June 2019 / Revised: 13 August 2019 / Accepted: 18 August 2019 / Published: 24 August 2019
(This article belongs to the Special Issue Lignin—Chemistry and Materials: Past, Present and Future)
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Abstract

Lignin processing products have an extensive using range. Because products properties depend on lignin precursor quality it was interesting to study lignin isolated from rice husk being a large tonnage waste of rice production and its structural transformations during carbonization. Lignin isolated by the thermal hydrolysis method with H2SO4 1 wt % solution and its carbonized products prepared under different carbonization conditions were characterized using elemental analysis, IR, TPD-MS, XRD, TEM, and EPR. It was shown lignin degradation takes place over the wide (220–520 °C) temperature range. Silica presenting in lignin affects the thermal destruction of this polymer. Due to the strong chemical bond with phenolic hydroxylic group it decreases an evaporation of volatile compounds and as a result increases the temperature range of the lignin degradation. Rice husk hydrolytic lignin transformations during carbonization occur with generation of free radicals. Their concentration is decreased after condensation of aromatic rings with carbon polycycles formation, i.e., the graphite-like structure. Quantity and X-ray diffraction characteristics of the graphite-like phase depend on carbonization conditions. Morphology of the lignin-based carbonized products is represented by carbon fibers, carbon and silica nanoparticles, and together with another structure characteristics provides prospective performance properties of lignin-based end products.
Keywords: hydrolytic lignin; rice husk; pyrolysis; carbonization; carbon structure; IR; TPD-MS; XRD; TEM; EPR hydrolytic lignin; rice husk; pyrolysis; carbonization; carbon structure; IR; TPD-MS; XRD; TEM; EPR

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MDPI and ACS Style

Yefremova, S.; Zharmenov, A.; Sukharnikov, Y.; Bunchuk, L.; Kablanbekov, A.; Anarbekov, K.; Kulik, T.; Nikolaichuk, A.; Palianytsia, B. Rice Husk Hydrolytic Lignin Transformation in Carbonization Process. Molecules 2019, 24, 3075. https://doi.org/10.3390/molecules24173075

AMA Style

Yefremova S, Zharmenov A, Sukharnikov Y, Bunchuk L, Kablanbekov A, Anarbekov K, Kulik T, Nikolaichuk A, Palianytsia B. Rice Husk Hydrolytic Lignin Transformation in Carbonization Process. Molecules. 2019; 24(17):3075. https://doi.org/10.3390/molecules24173075

Chicago/Turabian Style

Yefremova, Svetlana, Abdurassul Zharmenov, Yurij Sukharnikov, Lara Bunchuk, Askhat Kablanbekov, Kuanish Anarbekov, Tetiana Kulik, Alina Nikolaichuk, and Borys Palianytsia. 2019. "Rice Husk Hydrolytic Lignin Transformation in Carbonization Process" Molecules 24, no. 17: 3075. https://doi.org/10.3390/molecules24173075

APA Style

Yefremova, S., Zharmenov, A., Sukharnikov, Y., Bunchuk, L., Kablanbekov, A., Anarbekov, K., Kulik, T., Nikolaichuk, A., & Palianytsia, B. (2019). Rice Husk Hydrolytic Lignin Transformation in Carbonization Process. Molecules, 24(17), 3075. https://doi.org/10.3390/molecules24173075

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