Article
Agriculture, Multidisciplinary
Dingkai Wang, Mingyu Cui, Wei Zhao, Yanjun Li, Shangshang Ma, Zhijie Jiang, Xutang Liu, Chong Liang, Rujuan Li, Long Ma, Yanmin Song, Xian-Yong Wei
Summary: In this study, a novel method was developed to oxidatively degrade lignin into value-added four-carbon esters, particularly diethyl maleate (DEM), using a cooperative catalyst. Under optimized conditions, the lignin aromatic ring was effectively cleaved by oxidation to form DEM with a yield of 15.85% and a selectivity of 44.25%. This study provides a promising alternative method for the production of traditional petroleum-based chemicals.
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
(2023)
Article
Chemistry, Multidisciplinary
Shivam Rawat, Adarsh Kumar, Thallada Bhaskar
Summary: Ionic liquids are nonvolatile and thermally stable solvents that can be used for biomass valorization at different stages. They can effectively separate biomass components in high purity by selectively dissolving carbohydrates or lignin. The tunable properties of ionic liquids have led to successful transformation of lignin into high value-added chemicals. This review discusses the role of various factors and interactions between ionic liquids and feedstock during lignin isolation and depolymerization, and summarizes their properties for vanillin production and isolation.
CURRENT OPINION IN GREEN AND SUSTAINABLE CHEMISTRY
(2022)
Article
Agricultural Engineering
Hailian Gao, Jiebin Wang, Meixuan Liu, Shunxin Wang, Wenbo Li, Qingda An, Kunlan Li, Ligang Wei, Chi Han, Shangru Zhai
Summary: The aerobic oxidation of lignin model 2-phenoxyacetophenone (2-PAP) in cooperative ionic liquid mixtures (CoILs) with [C(2)C(1)im]OAc and [B(Z)C(1)im]NTf2 was investigated. The CoILs showed higher conversion and product yields compared to pure ILs, indicating the cooperative effects of the two ILs. [C(2)C(1)im]OAc promoted the catalytic cleavage of aryl-ether bonds and solvation, while [B(Z)C(1)im]NTf2 induced the formation of alkyl radicals and enhanced the product selectivity.
BIORESOURCE TECHNOLOGY
(2022)
Article
Chemistry, Physical
Tao Zhang, Dan Wang, Lianzheng Zhang, Dongmei Xu, Jun Gao, Yixin Ma, Yinglong Wang
Summary: Three N-alkyl-2-pyrrolidone based bronsted acidic ionic liquids were used as denitrogenation agents to remove quinoline from coal-based product model mixtures. The denitrogenation performance and the interactions between the ionic liquids and quinoline were evaluated.
JOURNAL OF MOLECULAR LIQUIDS
(2022)
Article
Chemistry, Physical
Qingqin Sun, Xu Fu, Peiru Wang, Kunlan Li, Ligang Wei, Shangru Zhai, Qingda An
Summary: The oxidative depolymerization of alkali lignin (AL) was catalyzed by copper-containing imidazolium-based ionic liquids ([C4C1im]CuCl3) in CH3OH-H2O solvent. [C4C1im]CuCl3 showed remarkable catalytic capacity due to the cooperative effects of [C4C1im]+ and CuCl3. The molar concentration of [C4C1im]CuCl3 greatly influenced AL conversion and product selectivity. The molecular interactions and microenvironment of [C4C1im]CuCl3-solvent system were investigated and the optimal catalytic capacity was obtained at a specific molar concentration of [C4C1im]CuCl3.
JOURNAL OF MOLECULAR LIQUIDS
(2023)
Editorial Material
Chemistry, Physical
D. Bradley G. Williams, Iurii Bodachivskyi
Summary: This comment points out misinterpreted data related to the reported synthesis of Bronsted acidic ionic liquids for the dissolution of chitosan. Through various analyses, it is demonstrated that such ionic liquids are unlikely to be produced.
JOURNAL OF MOLECULAR LIQUIDS
(2021)
Article
Chemistry, Physical
Guangyong Liu, Yumiao Lu, Junfeng Lu, Yanlei Wang, Shijing Liang, Hongyan He, Lilong Jiang
Summary: In this study, a robust trimetallic PdNiBi electrocatalyst was reported for reductive C-O bond cleavage of lignin, with excellent yields and operational stability in the presence of an ionic liquid electrolyte. Experimental investigations and DFT calculations revealed the outstanding performance of the catalyst resulting from the synergistic effect of the metal elements.
Article
Biochemistry & Molecular Biology
Wenbo Li, Yilin Wang, Dongchen Li, Jiachi Jiang, Kunlan Li, Kaili Zhang, Qingda An, Shangru Zhai, Ligang Wei
Summary: The oxidative depolymerization of alkali lignin in the [C(2)C(1)im]OAc system under mild conditions was successful, with the addition of water further improving reaction efficiency. The system allowed for the breakdown of specific inter-unit linkages of lignin, resulting in residual lignin with low molecular weight and narrow polydispersity index. The [C(2)C(1)im]OAc-based system proved to be a simple and efficient catalytic system for lignin oxidative depolymerization.
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
(2021)
Review
Biochemistry & Molecular Biology
Xin Wang, Wenbiao Xu, Dan Zhang, Xiangyu Li, Junyou Shi
Summary: Developing renewable biomass resources is urgent to mitigate climate change. Lignin, the only renewable aromatic feedstock found in nature, has gained global interest for its conversion and utilization. However, the complex structure of lignin, uncertain linkages, stability of side chains, and recondensation of reaction fragments make lignin depolymerization into biofuels or platform chemicals a challenging task. Therefore, understanding the structural characteristics and reactivity relationships is crucial for the high-value utilization of lignin. This review summarizes the key achievements in lignin conversion and discusses the influence of beta-O-4 content, S/G ratio, lignin sources, and an ideal lignin-catechyl lignin on the formation of lignin monomer products, as well as provides insights into the future direction of lignin depolymerization.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2023)
Article
Agricultural Engineering
B. M. Majeke, F. -X. Collard, L. Tyhoda, J. F. Gorgens
Summary: The study found that the combined use of quinone reductase and lignin peroxidase can effectively reduce the molecular weight of lignin, limit the re-polymerization of lignin, and improve the degradation efficiency of lignin and the value of degradation products.
BIORESOURCE TECHNOLOGY
(2021)
Article
Forestry
Ahmet Emre CelIk, Ahmet Can
Summary: This study investigated the improvement of accelerated weathering performance of Scots pine wood using deep eutectic solvents (DESs). The results showed that the lignin ratio decreased significantly in the wood samples subjected to 2-hour pretreatment at 150 degrees C. The use of DESs also resulted in stable gloss values and increased surface roughness with prolonged weathering exposure.
EUROPEAN JOURNAL OF WOOD AND WOOD PRODUCTS
(2023)
Article
Chemistry, Multidisciplinary
Ana Rita C. Morais, Jian Zhang, Hui Dong, William G. Otto, Thapelo Mokomele, David Hodge, Venkatesh Balan, Bruce E. Dale, Rafal M. Lukasik, Leonardo da Costa Sousa
Summary: A novel ammonia-based pretreatment method called COBRA was developed to reduce ammonia usage and integrate with biomass logistics. The pretreatment allowed high conversion of carbohydrates into soluble sugars using industrially relevant enzymatic hydrolysis conditions. The technoeconomic analysis showed that biorefineries based on COBRA-LE pretreatment had the lowest ethanol selling price. COBRA pretreatment was also successful in perennial grasses and hardwoods.
Article
Agricultural Engineering
Ying Xia, Qiying Liu, Xiaohong Hu, Xu Li, Yongwang Huang, Wenzhi Li, Longlong Ma
Summary: Hydrogen peroxide pretreatment combined with saturated calcium hydroxide solution effectively removed lignin and induced hemicellulose solubility in ferrous sulfate solution, facilitating subsequent cellulose conversion. This study demonstrates that oxidative pretreatment is an effective method for refining lignocellulose and enhancing cellulose conversion.
INDUSTRIAL CROPS AND PRODUCTS
(2022)
Article
Biochemistry & Molecular Biology
Fabricia Farias de Menezes, Damaris Batistao Martim, Liu Yi Ling, Aline Tieppo Nogueira Mulato, Elaine Crespim, Juliana Velasco de Castro Oliveira, Carlos Eduardo Driemeier, Priscila Oliveira de Giuseppe, George Jackson de Moraes Rocha
Summary: In this study, the hydrothermal depolymerization of beta-O-4'-rich lignin extracted from sugarcane bagasse was evaluated, showing that the bio-oils produced under different reaction conditions had varying physicochemical properties, with the light bio-oil rich in aromatic monomers promoting bacterial growth.
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
(2022)
Review
Energy & Fuels
Zhen Wu, Yetao Jiang, Xiaoyu Wang, Jiaxing Xu, Lei Hu
Summary: This review comprehensively summarizes various separation methods for lignin derivatives and discusses the research progress of lignin depolymerized products separation, as well as proposes several feasible ideas for future separation of lignin depolymerized products.
BIOMASS CONVERSION AND BIOREFINERY
(2022)
Review
Biochemistry & Molecular Biology
Sandip K. Singh
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
(2019)
Article
Engineering, Chemical
Sandip K. Singh, Paresh L. Dhepe
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2019)
Review
Chemistry, Physical
Sandip K. Singh, Anthony W. Savoy
JOURNAL OF MOLECULAR LIQUIDS
(2020)
Article
Environmental Sciences
Sandip K. Singh, Paresh L. Dhepe
WASTE AND BIOMASS VALORIZATION
(2020)
Article
Agricultural Engineering
Brian K. Saulnier, Thanaphong Phongpreecha, Sandip K. Singh, David B. Hodge
BIORESOURCE TECHNOLOGY
(2020)
Review
Green & Sustainable Science & Technology
Sandip K. Singh
Summary: Plant biomass is a promising candidate for mitigating greenhouse gas emissions. Pretreatment plays a crucial role in separating cellulose, hemicellulose and lignin, removing inhibitors and enhancing enzyme activity. Biological treatment methods are eco-friendly, easy to operate and operate at mild conditions, making them advantageous for biomass processing.
JOURNAL OF CLEANER PRODUCTION
(2021)
Article
Chemistry, Multidisciplinary
Zhaoyang Yuan, Grace E. Klinger, Saeid Nikafshar, Yanbin Cui, Zhen Fang, Manar Alherech, Shannon Goes, Colin Anson, Sandip K. Singh, Bryan Bals, David B. Hodge, Mojgan Nejad, Shannon S. Stahl, Eric L. Hegg
Summary: The study demonstrates that using both oxygen and hydrogen peroxide as co-oxidants during alkaline-oxidative pretreatment can significantly improve biomass fractionation and increase enzymatic digestibility. The addition of O-2 has a significant impact on delignification, while the presence of hydrogen peroxide is equally crucial.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2021)
Article
Materials Science, Multidisciplinary
Xu-Jing Liu, Ming-Fei Li, Sandip K. Singh
Summary: The study successfully prepared an adsorbent from lignin-derived biochar modified with MnO2, which showed significantly enhanced adsorption capacity for methylene blue dye. The modified biochar exhibited higher efficiency and decolorization rate in removing methylene blue, demonstrating potential application in reducing environmental pollution.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2021)
Article
Environmental Sciences
Sandip K. Singh, Paresh L. Dhepe
Summary: Investigations on the composition analysis and properties of lignocellulosic materials are important in understanding the effects of recovery methods and substrate dependency. This study analyzed three rice husks samples and quantified the alpha-, beta-, and gamma-cellulose, pentosan, and silica content. The correlations between biomass source, lignin recovery, properties, and depolymerization were studied using various analytical techniques. The recovered lignin was found to be free of polysaccharides and associated with specific moieties, with varying intensities.
WASTE AND BIOMASS VALORIZATION
(2022)
Article
Energy & Fuels
Sandip K. Singh, Babasaheb M. Matsagar, Paresh L. Dhepe
Summary: For the development of an effective lignocellulosic biomass conversion technology, it is important to characterize the composition and properties of the biomass. This study developed a simple method to quantitatively analyze the cellulose, hemicellulose, lignin, and silica content of wheat straw and bagasse samples. The results showed that the bagasse samples contained higher proportions of structural biopolymers. Lignin recovery using acid hydrolysis showed significant differences in properties, and depolymerization of the lignin samples using different catalysts yielded high product yields.
BIOMASS CONVERSION AND BIOREFINERY
(2022)
Article
Agriculture, Multidisciplinary
Brian K. Saulnier, Mohsen Siahkamari, Sandip K. Singh, Mojgan Nejad, David B. Hodge
Summary: This study evaluated the impact of pretreatment conditions on lignin extractability, properties, and utility in wood phenol-formaldehyde (PF) adhesives by subjecting corn stover to dilute sulfuric acid pretreatment. The findings showed that both formic acid and NaOH could extract and recover a significant amount of lignin after pretreatment and enzymatic hydrolysis, while still achieving reasonable enzymatic hydrolysis yields. The availability of reaction sites for lignin incorporation into the PF polymer matrix was strongly influenced by the pretreatment time and recovery. Additionally, a lignin-based wood adhesive was developed by replacing phenol with formic-acid-extracted lignin, which exhibited superior dry shear strength compared to conventional PF adhesives.
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
(2022)
Article
Chemistry, Multidisciplinary
Sandip K. Singh, Kolja Ostendorf, Markus Euring, Kai Zhang
Summary: This paper introduces a novel lignin-based adhesive synthesized through the synergistic reaction between lignin, dimethylformamide, and acrylic acid under a basic environment. The characterized adhesive shows excellent adhesive performance on various substrates and exhibits good physical-mechanical strength under neutral, acidic, or basic media. It is a versatile and universally applicable adhesive.
Article
Agricultural Engineering
Thanaphong Phongpreecha, Kendall F. Christy, Sandip K. Singh, Pengchao Hao, David B. Hodge
BIORESOURCE TECHNOLOGY
(2020)
Meeting Abstract
Chemistry, Multidisciplinary
Sandip Kumar Singh, Anthony Savoy, Zhaoyang Yuan, Bryan Bals, Eric Hegg, David Hodge
ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY
(2019)
Article
Chemistry, Multidisciplinary
Ajeet Singh, Yury Torubaev, Shagufi N. Ansari, Sandip K. Singh, Shaikh M. Mobin, Pradeep Mathur
