Key Laboratory of Hubei Province for Coal Conversion and New Carbon Materials, School of Chemistry and Chemical Engineering, Wuhan University of Science and Technology, Wuhan 430081, China.
Key Laboratory of Hubei Province for Coal Conversion and New Carbon Materials, School of Chemistry and Chemical Engineering, Wuhan University of Science and Technology, Wuhan 430081, China.
J Hazard Mater. 2022 Aug 5;435:129072. doi: 10.1016/j.jhazmat.2022.129072. Epub 2022 May 4.
The rationally-designed lignocellulose valorization that promotes a novel "waste-treats-pollutant" standpoint is highly desired yet still challenging for the spread of biomass industry. At this point, a cascade technique with the assistance of deep eutectic solvent (DES) fractionation is tailored to dually valorize wheat straw into fluorescent lignin carbon dots (LCDs) and bimetallic Mg-Fe oxide-decorated biochar (MBC) via solvothermal engineering and co-precipitation/pyrolysis respectively. Benefitting from the abundance of β-aryl ether and hydroxyl groups in DES-extracted lignin, the photoluminescence LCDs emit blue color in a wide excitation span, which can be adopted to selectively detect ferric ions (Fe) in a broad dosage scale with a highly linear correlation of 10-50 μM. Taking advantages of the MBC-aided persulfate activation, we propose the efficient arbidol removal system with a universal concentration of 20-200 ppm in the scalable pH ranging from 3 to 11. The dominate migration pathways involving with active oxygen species and surface electron transfer are comprehensively studied via electron paramagnetic resonance, radical-quenching experiments, and theoretical arithmetic. With the endeavor of biorefineries, this full-scale platform ignites the dazzling wildfire from dual lignocellulose valorization that will also seek its accurate position in the kingdoms of functional materials and wastewater restoration.
理性设计的木质纤维素增值转化，提倡一种新颖的“废物处理-污染物”观点，这对于生物质产业的推广是非常需要的，但仍然具有挑战性。在这一点上，我们采用级联技术，在深共晶溶剂（DES）分馏的辅助下，通过溶剂热工程和共沉淀/热解，分别将小麦秸秆双重增值为荧光木质素碳点（LCDs）和双金属 Mg-Fe 氧化物修饰生物炭（MBC）。得益于 DES 提取木质素中丰富的β-芳基醚和羟基，光致发光 LCDs 在宽激发范围内发出蓝色光，可以采用该方法在广泛的剂量范围内选择性检测铁离子（Fe），线性相关度高达 10-50 μM。利用 MBC 辅助过硫酸盐的活化作用，我们提出了一种高效的利巴韦林去除体系，在可扩展的 pH 值范围 3-11 内，其通用浓度为 20-200 ppm。通过电子顺磁共振、自由基猝灭实验和理论算法，全面研究了涉及活性氧物种和表面电子转移的主导迁移途径。通过生物炼制的努力，这个全面的平台点燃了从双重木质纤维素增值转化中产生的耀眼野火，它也将在功能材料和废水修复领域中找到自己的准确位置。
