A comparative study of ionothermal treatment of rice straw using triflate and acetate-based ionic liquids
Ionic liquids (ILs) have found applications in the pretreatment of waste lignocellulosic biomass by interacting with the carbohydrate molecules present in the biomass materials. Pretreatment is essential before biomass conversion into valuable chemicals, fuels, and many other value-added products. T...
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| Format: | Article |
| Language: | English |
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Elsevier
2022-12-01
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| Series: | Journal of Ionic Liquids |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2772422022000210 |
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| author | K.J. Jisha Sunita Rajamani Dharmendra Singh Gyanendra Sharma Ramesh L. Gardas |
| author_facet | K.J. Jisha Sunita Rajamani Dharmendra Singh Gyanendra Sharma Ramesh L. Gardas |
| author_sort | K.J. Jisha |
| collection | DOAJ |
| description | Ionic liquids (ILs) have found applications in the pretreatment of waste lignocellulosic biomass by interacting with the carbohydrate molecules present in the biomass materials. Pretreatment is essential before biomass conversion into valuable chemicals, fuels, and many other value-added products. This comparative study mainly focused on the pretreatment ability of four ILs having acetate or triflate as a common anion with different cations. Among various studied ILs, diazabicyclo[5.4.0]undec-7-ene (DBU)-based acidic ionic liquid when used as a dual solvocatalyst showed significant structural modifications of the rice straw (RS) sample, through C6-O bond breakage assisted by the tertiary nitrogen in DBU cation. Structural modifications due to the pretreatment were confirmed through SEM, PXRD, and FTIR analysis. The elemental analysis confirmed that carbon content in original RS is reduced to 29% and 20% upon ionothermal treatment of RS with IL at 90 °C and 120 °C, respectively. Additionally, TGA indicated that further pyrolysis could be easier with the pretreated rice straw yielding biochar up to 9% thereby reducing wastes. Conversion of RS was found to be 60% which reduced marginally to 50% after three cycles of recycling the IL. The findings of this work provide the proof of concept that studied IL with high thermal stability and recyclability should act as a potential solvocatalyst in sustainable pretreatment and other biomass applications. |
| first_indexed | 2024-04-11T06:24:52Z |
| format | Article |
| id | doaj.art-372cb3160278471cb0cb19af7a18963f |
| institution | Directory Open Access Journal |
| issn | 2772-4220 |
| language | English |
| last_indexed | 2024-04-11T06:24:52Z |
| publishDate | 2022-12-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Ionic Liquids |
| spelling | doaj.art-372cb3160278471cb0cb19af7a18963f2022-12-22T04:40:24ZengElsevierJournal of Ionic Liquids2772-42202022-12-0122100037A comparative study of ionothermal treatment of rice straw using triflate and acetate-based ionic liquidsK.J. Jisha0Sunita Rajamani1Dharmendra Singh2Gyanendra Sharma3Ramesh L. Gardas4Department of Chemistry, Indian Institute of Technology Madras, Chennai 600036, IndiaDepartment of Chemistry, Indian Institute of Technology Madras, Chennai 600036, India; Department of Chemistry, St. Joseph's College (Autonomous), Langford Road, Bengaluru, Karnataka 560027, IndiaDepartment of Chemistry, Indian Institute of Technology Madras, Chennai 600036, India; Department of Applied Science & Humanities, Institute of Engineering & Technology, Dr. Ram Manohar Lohia Avadh University, Ayodhya, U. P. 224001, IndiaDepartment of Chemistry, Indian Institute of Technology Madras, Chennai 600036, India; Faculty of Biological Science and Technology, Institute of Science and Engineering, Kanazawa University, Kakuma-machi, Kanazawa 920-1192, JapanDepartment of Chemistry, Indian Institute of Technology Madras, Chennai 600036, India; Corresponding author.Ionic liquids (ILs) have found applications in the pretreatment of waste lignocellulosic biomass by interacting with the carbohydrate molecules present in the biomass materials. Pretreatment is essential before biomass conversion into valuable chemicals, fuels, and many other value-added products. This comparative study mainly focused on the pretreatment ability of four ILs having acetate or triflate as a common anion with different cations. Among various studied ILs, diazabicyclo[5.4.0]undec-7-ene (DBU)-based acidic ionic liquid when used as a dual solvocatalyst showed significant structural modifications of the rice straw (RS) sample, through C6-O bond breakage assisted by the tertiary nitrogen in DBU cation. Structural modifications due to the pretreatment were confirmed through SEM, PXRD, and FTIR analysis. The elemental analysis confirmed that carbon content in original RS is reduced to 29% and 20% upon ionothermal treatment of RS with IL at 90 °C and 120 °C, respectively. Additionally, TGA indicated that further pyrolysis could be easier with the pretreated rice straw yielding biochar up to 9% thereby reducing wastes. Conversion of RS was found to be 60% which reduced marginally to 50% after three cycles of recycling the IL. The findings of this work provide the proof of concept that studied IL with high thermal stability and recyclability should act as a potential solvocatalyst in sustainable pretreatment and other biomass applications.http://www.sciencedirect.com/science/article/pii/S2772422022000210Lignocellulosic biomassPretreatmentRice strawDBU based ionic liquid: Ionothermal processMorphological changes |
| spellingShingle | K.J. Jisha Sunita Rajamani Dharmendra Singh Gyanendra Sharma Ramesh L. Gardas A comparative study of ionothermal treatment of rice straw using triflate and acetate-based ionic liquids Journal of Ionic Liquids Lignocellulosic biomass Pretreatment Rice straw DBU based ionic liquid: Ionothermal process Morphological changes |
| title | A comparative study of ionothermal treatment of rice straw using triflate and acetate-based ionic liquids |
| title_full | A comparative study of ionothermal treatment of rice straw using triflate and acetate-based ionic liquids |
| title_fullStr | A comparative study of ionothermal treatment of rice straw using triflate and acetate-based ionic liquids |
| title_full_unstemmed | A comparative study of ionothermal treatment of rice straw using triflate and acetate-based ionic liquids |
| title_short | A comparative study of ionothermal treatment of rice straw using triflate and acetate-based ionic liquids |
| title_sort | comparative study of ionothermal treatment of rice straw using triflate and acetate based ionic liquids |
| topic | Lignocellulosic biomass Pretreatment Rice straw DBU based ionic liquid: Ionothermal process Morphological changes |
| url | http://www.sciencedirect.com/science/article/pii/S2772422022000210 |
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