Key Laboratory of Industrial Biotechnology of MOE, School of Biotechnology, Jiangnan University, Wuxi 214122, China.
School of Chemistry and Chemical Engineering, Chongqing University of Technology, Chongqing 400054, China.
Bioresour Technol. 2022 Oct;362:127861. doi: 10.1016/j.biortech.2022.127861. Epub 2022 Aug 28.
This study proposed a mild chlorination-sulfonation approach to synthesize magnetic carbon acid bearing with catalytic SOH and adsorption Cl bifunctional sites on polydopamine coating. The catalysts exerted good textural structure and surface chemical properties (i.e., porosity, high specific surface area of >70 m/g, high catalytic activity with 0.86-1.1 mmol/g of SOH sites and 0.8%-1.9% of Cl sites, and abundant hydrophilic functional groups), rendering a maximum cellobiose adsorption efficiency of ∼40% within 6 h. Moreover, the catalysts had strong fracture characteristics on different α-/β-glycosidic bonds with 85.4%-93.9% of disaccharide conversion, while selectively fractionating hemicellulose from wheat straw with 64.3% of xylose yield and 93.4% of cellulose retention. Due to the stable interaction between parent polydopamine support with Fe core and functional groups, the catalysts efficiently recovered by simple magnetic separation had good reusability with minimal losses in catalytic activity.
本研究提出了一种温和的氯化-磺化方法，合成了具有催化 SOH 和吸附 Cl 双功能位的磁性碳酸，担载在聚多巴胺涂层上。该催化剂具有良好的织构结构和表面化学性质（即，孔隙率高，比表面积>70 m/g，SOH 位的催化活性高，为 0.86-1.1 mmol/g，Cl 位为 0.8%-1.9%，以及丰富的亲水官能团），在 6 小时内实现了约 40%的纤维二糖吸附效率。此外，该催化剂对不同的 α-/β-糖苷键具有很强的断裂特性，二糖转化率为 85.4%-93.9%，同时从麦草中选择性分离半纤维素，木糖收率为 64.3%，纤维素保留率为 93.4%。由于母体聚多巴胺载体与 Fe 核和官能团之间的稳定相互作用，催化剂可以通过简单的磁分离有效回收，且具有良好的可重复使用性，催化活性损失极小。
