Zn-free MOFs like MIL-53(Al) and MIL-125(Ti) for the preparation of defect-rich, ultrafine ZnO nanosheets with high photocatalytic performance

Facile synthesis of carbon quantum dots with high fluorescence and excellent biocompatibility A cost efficient synergistic strategy combining mild alkaline pretreatment (0.5-5% NaOH at 70 C for 60 min) and bovine serum albumin (BSA) blocking of lignin was evaluated for effective conversion of poplar. The highest glucose yield of 69.2% was obtained for 5% alkaline pretreated sample, which was 4.4 times that of untreated sample. The enhanced enzymatic hydrolysis was attributed to significant hemicelluloses removal with limited delignification. Delignification mainly occurred in secondary wall, leading to more open cell wall structure, thus facilitating better transport of enzyme. Hemicelluloses removal helped split adjacent microfibrils, thus increased the specific sites for cellulase binding.

高荧光与优异生物相容性碳量子点（carbon quantum dots）的简易合成
本研究评估了一种兼具成本效益的协同策略：将温和碱预处理（70℃下采用0.5%~5%氢氧化钠溶液处理60分钟）与牛血清白蛋白（bovine serum albumin, BSA）封闭木质素相结合，以实现杨木的高效转化。采用5%碱液预处理的样品可获得最高69.2%的葡萄糖得率，为未处理样品的4.4倍。酶水解效率的提升可归因于：该预处理在实现有限脱木质素的同时，可显著去除半纤维素。脱木质化主要发生在细胞次生壁中，使细胞壁结构更为疏松，从而促进酶分子的有效传输。半纤维素的去除有助于拆分相邻的微纤丝，进而增加了可与纤维素酶结合的特异性位点。