Multi-step pre-treatment of rice husk for fractionation of components including silica
IntroductionRice husk, a widely available agricultural by-product lignocellulosic biomass, is a promising and sustainable feedstock for organic and inorganic chemicals due to the rich silica content. However, its current application is largely limited, with most being incinerated as waste. This stud...
Saved in:
| Main Authors: | , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Frontiers Media S.A.
2025-01-01
|
| Series: | Frontiers in Chemistry |
| Subjects: | |
| Online Access: | https://www.frontiersin.org/articles/10.3389/fchem.2025.1538797/full |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1832590908951887872 |
|---|---|
| author | Shinnosuke Ishida Shinji Kudo Shinji Kudo Shusaku Asano Shusaku Asano Jun-ichiro Hayashi Jun-ichiro Hayashi |
| author_facet | Shinnosuke Ishida Shinji Kudo Shinji Kudo Shusaku Asano Shusaku Asano Jun-ichiro Hayashi Jun-ichiro Hayashi |
| author_sort | Shinnosuke Ishida |
| collection | DOAJ |
| description | IntroductionRice husk, a widely available agricultural by-product lignocellulosic biomass, is a promising and sustainable feedstock for organic and inorganic chemicals due to the rich silica content. However, its current application is largely limited, with most being incinerated as waste. This study introduces a novel multi-step pre-treatment process to fractionate these components efficiently, enabling their comprehensive valorization.MethodsThe process begins with hydrothermal treatment, selectively extracting hemicellulose while preserving the structural integrity of other components. This is followed by an organosolv treatment using ethanol/water mixture, optimized to dissolve and extract organosolv lignin effectively. Subsequently, alkaline aqueous solution treatment under nitrogen atmosphere facilitates the recovery of silica as sodium silicate, a valuable industrial precursor. To ensure high-purity cellulose recovery, the final step employs alkaline hydrothermal processing under oxygen, achieving effective lignin depolymerization and removal.Results and discussionEach step was carefully optimized, considering parameters such as temperature, solvent composition, and reaction time, to enhance selectivity and yield. Notably, this method reduces environmental negative impact by avoiding the use of acids while utilizing renewable solvents. The sequential application of these treatments resulted in separation exceeding 97% for hemicellulose, lignin, and silica, leaving high-purity cellulose with the loss of 22.8 wt%. Hemicellulose, organosolv lignin, and silica in the removed fractions were 66.5, 78.1, and 77.5 wt% at the first, second, and third treatments, respectively. |
| format | Article |
| id | doaj-art-bb2f952bfab94b1fa5aebc5c608e147e |
| institution | Kabale University |
| issn | 2296-2646 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Chemistry |
| spelling | doaj-art-bb2f952bfab94b1fa5aebc5c608e147e2025-01-23T06:56:16ZengFrontiers Media S.A.Frontiers in Chemistry2296-26462025-01-011310.3389/fchem.2025.15387971538797Multi-step pre-treatment of rice husk for fractionation of components including silicaShinnosuke Ishida0Shinji Kudo1Shinji Kudo2Shusaku Asano3Shusaku Asano4Jun-ichiro Hayashi5Jun-ichiro Hayashi6Interdisciplinary Graduate School of Engineering Sciences, Kyushu University, Kasuga, JapanInterdisciplinary Graduate School of Engineering Sciences, Kyushu University, Kasuga, JapanInstitute for Materials Chemistry and Engineering, Kyushu University, Kasuga, JapanInterdisciplinary Graduate School of Engineering Sciences, Kyushu University, Kasuga, JapanInstitute for Materials Chemistry and Engineering, Kyushu University, Kasuga, JapanInterdisciplinary Graduate School of Engineering Sciences, Kyushu University, Kasuga, JapanInstitute for Materials Chemistry and Engineering, Kyushu University, Kasuga, JapanIntroductionRice husk, a widely available agricultural by-product lignocellulosic biomass, is a promising and sustainable feedstock for organic and inorganic chemicals due to the rich silica content. However, its current application is largely limited, with most being incinerated as waste. This study introduces a novel multi-step pre-treatment process to fractionate these components efficiently, enabling their comprehensive valorization.MethodsThe process begins with hydrothermal treatment, selectively extracting hemicellulose while preserving the structural integrity of other components. This is followed by an organosolv treatment using ethanol/water mixture, optimized to dissolve and extract organosolv lignin effectively. Subsequently, alkaline aqueous solution treatment under nitrogen atmosphere facilitates the recovery of silica as sodium silicate, a valuable industrial precursor. To ensure high-purity cellulose recovery, the final step employs alkaline hydrothermal processing under oxygen, achieving effective lignin depolymerization and removal.Results and discussionEach step was carefully optimized, considering parameters such as temperature, solvent composition, and reaction time, to enhance selectivity and yield. Notably, this method reduces environmental negative impact by avoiding the use of acids while utilizing renewable solvents. The sequential application of these treatments resulted in separation exceeding 97% for hemicellulose, lignin, and silica, leaving high-purity cellulose with the loss of 22.8 wt%. Hemicellulose, organosolv lignin, and silica in the removed fractions were 66.5, 78.1, and 77.5 wt% at the first, second, and third treatments, respectively.https://www.frontiersin.org/articles/10.3389/fchem.2025.1538797/fullbiomassrice huskfractionationpre-treatmentsilica |
| spellingShingle | Shinnosuke Ishida Shinji Kudo Shinji Kudo Shusaku Asano Shusaku Asano Jun-ichiro Hayashi Jun-ichiro Hayashi Multi-step pre-treatment of rice husk for fractionation of components including silica Frontiers in Chemistry biomass rice husk fractionation pre-treatment silica |
| title | Multi-step pre-treatment of rice husk for fractionation of components including silica |
| title_full | Multi-step pre-treatment of rice husk for fractionation of components including silica |
| title_fullStr | Multi-step pre-treatment of rice husk for fractionation of components including silica |
| title_full_unstemmed | Multi-step pre-treatment of rice husk for fractionation of components including silica |
| title_short | Multi-step pre-treatment of rice husk for fractionation of components including silica |
| title_sort | multi step pre treatment of rice husk for fractionation of components including silica |
| topic | biomass rice husk fractionation pre-treatment silica |
| url | https://www.frontiersin.org/articles/10.3389/fchem.2025.1538797/full |
| work_keys_str_mv | AT shinnosukeishida multisteppretreatmentofricehuskforfractionationofcomponentsincludingsilica AT shinjikudo multisteppretreatmentofricehuskforfractionationofcomponentsincludingsilica AT shinjikudo multisteppretreatmentofricehuskforfractionationofcomponentsincludingsilica AT shusakuasano multisteppretreatmentofricehuskforfractionationofcomponentsincludingsilica AT shusakuasano multisteppretreatmentofricehuskforfractionationofcomponentsincludingsilica AT junichirohayashi multisteppretreatmentofricehuskforfractionationofcomponentsincludingsilica AT junichirohayashi multisteppretreatmentofricehuskforfractionationofcomponentsincludingsilica |