@article {LIAO2024129677, title = {Eco-friendly regeneration of lignin with acidic deep eutectic solvent for adsorption of pollutant dyes for water cleanup}, journal = {International Journal of Biological Macromolecules}, volume = {260}, year = {2024}, pages = {129677}, abstract = {In this study, a simple and eco-friendly method was used to treat alkaline lignin with an acidic deep eutectic solvent (DES) to obtain regenerated lignin for the efficient adsorption of pollutant dyes from aqueous environment. Based on the yield and adsorption capacity of the sorbent for these dyes, conditions such as the type and concentration of DES component, solid-to-liquid ratio, reaction time, and temperature were optimized. By characterizing and comparing alkali lignin with regenerated lignin, a series of reactions were demonstrated to occur during the DES treatment process. The performance and mechanism of methylene blue and rhodamine B adsorption on regenerated lignin were studied systematically, and the maximum adsorbed amounts were 348.29 and 551.05~mg/g at 323~K, respectively. This study provides a new strategy for the green preparation of functionalized lignin and its use in the water pollutant treatment.}, keywords = {Deep eutectic solvent, Green regeneration of lignin, LIGNIN, Pollutant adsorption}, issn = {0141-8130}, doi = {https://doi.org/10.1016/j.ijbiomac.2024.129677}, url = {https://www.sciencedirect.com/science/article/pii/S014181302400480X}, author = {Yuqing Liao and Wuxia Ge and Min Liu and Wentao Bi and Can Jin and David Da Yong Chen} } @article {ZHANG2023127394, title = {Preparation of carbon-rich material from Dendrobium officinale polysaccharide in deep eutectic system}, journal = {International Journal of Biological Macromolecules}, volume = {253}, year = {2023}, pages = {127394}, abstract = {

A carbon-rich material (DESysChar) was prepared from polysaccharide within a deep eutectic system (DESys) containing oxalic acid, and systematically characterized using various analytical techniques. The investigation of reaction mechanism revealed concurrent dehydration and etherification processes. This study commenced with the extraction of plant polysaccharide using the DESys-based mechanochemical extraction method from Dendrobium officinale. Subsequently, the DESys method was used to carbonize the extracted Dendrobium officinale polysaccharide and produce DESysChar. DESysChar was then used for the adsorption and determination of pollutants in water. This study represents a significant advancement in eco-friendly material synthesis, enabling the low-temperature (120\ \°C) carbonization of plant-derived polysaccharides, thereby reducing energy consumption and environmental impact. The effective adsorption of methylene blue by DESysChar underscores its potential in environmental remediation. This study presents a more responsible and efficient approach to polysaccharide extraction and carbonization, addressing environmental concerns. Embracing the 4S workflow (involving Sustainable raw materials converted into Sustainable degradable products, by using Sustainable technology throughout the process to create a Sustainable environment) promotes sustainability in material development, laying the foundation for future eco-friendly practices in various industries. In summary, this study propels sustainable polysaccharide development for widespread use.

}, keywords = {Carbon-rich material, Deep eutectic solvent, Deep eutectic system, Pollutant adsorption, POLYSACCHARIDE}, issn = {0141-8130}, doi = {https://doi.org/10.1016/j.ijbiomac.2023.127394}, url = {https://www.sciencedirect.com/science/article/pii/S0141813023042915}, author = {Yuan Zhang and Lu Yu and Wuxia Ge and Wentao Bi and David D. Y. Chen} } @article {CAO2022100680, title = {Adsorption behavior of anthraquinones in deep eutectic solvent on polyester fiber and its application}, journal = {Sustainable Chemistry and Pharmacy}, volume = {27}, year = {2022}, pages = {100680}, abstract = {

Deep eutectic solvents (DESs can be used to facilitate the adsorption of anthraquinone dyes into polyester fabrics (PETFs) in facile conditions. The adsorption mechanism was investigated through a systematic characterisation study using methods including 1H nuclear magnetic resonance spectroscopy, ultraviolet\–visible spectroscopy, scanning electron microscopy, Fourier transform infrared spectroscopy, thermogravimetric analysis, water contact angle analysis, and tensile strength tests. It was found that anthraquinone dyes have different types of interactions with DESs, and that the adsorption and dyeing of PETF can be achieved only when the interactions between PETF and anthraquinones were stronger than those between the PETF and DESs. Additionally, the type of DES, hydrogen bond acceptor\–hydrogen bond donor ratio, dye concentration, dyeing temperature, and dyeing time affect the adsorption and dyeing efficiency. In summary, PETF was successfully dyed with DES as a solvent, and the presence of DES did not destroy the PETF or significantly change its properties. Meanwhile, anthraquinone dyes affect the properties of PETF by forming non-covalent interactions. This study provides insights into problems encountered with adsorption and separation of target compounds in DESs, and provides the textile industry with a potentially much greener alternative that can reduce energy consumption and pollutant emissions, and avoid using toxic solvents for dyeing fabrics using DESs.

}, keywords = {ADSORPTION, Deep eutectic solvent, Dispersive dye, Polyester fabric}, issn = {2352-5541}, doi = {https://doi.org/10.1016/j.scp.2022.100680}, url = {https://www.sciencedirect.com/science/article/pii/S2352554122000845}, author = {Dan Cao and Min Liu and Yung-Chih Su and Zehui Yang and Wentao Bi and David D. Y. Chen} } @article {CAO2022100222, title = {Direct carboxylation of cellulose in deep eutectic solvent and its adsorption behavior of methylene blue}, journal = {Carbohydrate Polymer Technologies and Applications}, year = {2022}, pages = {100222}, abstract = {

The surface of cellulose particles was carboxylated (2.44 mmol/g) in a deep eutectic solvent containing carboxylic acid. Based on the carboxyl content, the effects of key factors on cellulose carboxylation was systematically investigated. In addition, the reaction mechanism was studied by using liquid chromatography-mass spectrometry, and the influence of deep eutectic solvent containing carboxylic acid on the structure and physicochemical properties of cellulose during carboxylation was examined using different characterization techniques. The results showed that the type of carboxylic acid, cellulose particle size, and pretreatment methods significantly affect the carboxylation efficiency, degradation, and carbonization of cellulose. The internal crystal structure of cellulose did not change after the carboxylation reaction, while the surface crystal structure was destroyed by carboxylation, which greatly improved the dispersion and hydrophilicity properties of the product. The kinetics and thermodynamics of carboxyl cellulose adsorption were studied as well. Potential application of carboxyl cellulose in the adsorption of pollutants was demonstrated. This study provides a new method for the direct modification of cellulose in deep eutectic solvents, as well as a new sustainable strategy for modifying other materials.

}, keywords = {Adsorption of pollutant, Carboxylation, Carboxylic acid, Cellulose particles, Deep eutectic solvent}, issn = {2666-8939}, doi = {https://doi.org/10.1016/j.carpta.2022.100222}, url = {https://www.sciencedirect.com/science/article/pii/S2666893922000408}, author = {Xiwang Cao and Min Liu and Wentao Bi and Jun Lin and David D. Y. Chen} }