Pyruvaldehyde as a carbon source is synthesized together with boric acid to produce a carbon-based solid catalyst with in situ bifunctional groups of adsorptive boron hydroxyls and carboxyls in a single-step hydrothermal carbonization process, which is mainly utilized to induce the hydrolysis of cellulose to sugar in pure water. The obtained catalyst exhibits a strong adsorption capacity of 532 mg g−1 with cotton cellulose and possesses good water dispersibility. It can effectively break the aggregated structure of cellulose through the strong interfacial adsorption interaction to induce the hydrolysis of cellulose to sugar with high efficiency in the pure aqueous system. The cellulose conversion and the glucose yield reach 97.3% and 40.0%, respectively. Additionally, the catalyst demonstrates excellent hydrothermal stability and reusability. As a result, a high-yield, acid-free, green, and environmentally friendly hydrolytic process of cellulose to sugar in pure water is successfully established.
Yucui Shen,Ye Feng,Shengjie Liang,Chunyong Liang,Baoe Li,Donghui Wang,Jianwei Sun
Developing a microenvironment-responsive drug delivery system (DDS) for the gastrointestinal system is of great interest to enhance drug efficiency and minimize side effects. Unfortunately, the rapid-flowing digestive juice in the gastrointestinal tract and the continuous contraction and peristalsis of the gastrointestinal tract muscle accelerate the elimination of drug carriers. In this study, a boric hydroxyl-modified mesoporous Mg(OH)2 drug carrier is prepared to prolong the drug retention time. Results show that the newly designed DDS presents high biocompatibility and can immediately turn the free polyhydric alcohol molecules into a gelation form. The in situ-formed gelation network presents high viscosity and can prevent the drug carriers from being washed away by the digestive juice in the gastrointestinal tract.
Oxidative dehydrogenation of propane is a promising technology for the preparation of propene. Boron-based nonmetal catalysts exhibit remarkable selectivity toward propene and limit the generation of CO x byproducts due to unique radical-mediated C–H activation. However, due to the high barrier of O-H bond cleavage in the presence of O 2 , the radical initialization of the B-based materials requires a high temperature to proceed, which decreases the thermodynamic advantages of the oxidative dehydrogenation reaction. Here, we report that the boron oxide overlayer formed in situ over metallic Ni nanoparticles exhibits extraordinarily low-temperature activity and selectivity for the ODHP reaction. With the assistance of subsurface Ni, the surface specific activity of the BO x overlayer reaches 93 times higher than that of bare boron nitride. A mechanistic study reveals that the strong affinity of the subsurface Ni to the oxygen atoms reduces the barrier of radical initiation and thereby balances the rates of the BO-H cleavage and the regeneration of boron hydroxyl groups, accounting for the excellent low-temperature performance of Ni@BO x /BN catalysts.
危险品化学品经营许可证（带存储）