Degumming is the most critical step for the silk textile industry and the process of silk-based advanced materials . However, current common degumming techniques are largely limited because of insufficient efficiency, obvious hydrolysis damage and difficulty in long-term storage. Here, deep eutectic solvent (DES) constituted of choline chloride (ChCl) and urea was explored to Bombyx mori silk fibers degumming without combining any further treatment. Compared to traditional alkali methods, DES could quickly remove about 26.5 % of sericin in just 40 min, and its degumming efficiency hardly decrease after seven cycles. Owing to the “tear off” degumming mechanism of DES molecules with "large volume", the resulted sericin has a large molecular weight of 250 kDa. In addition, because of antibacterial activity and stabilizing effect, no aggregation occurred and strong bacterial growth inhibition was triggered in the obtained sericin/DES solution. Furthermore, thanks to the good retention of crystalline region and slight swelling of amorphous area, the sericin-free fibroin showed significant increases in moisture absorption and dye uptake, while maintaining good mechanical properties . Featured with high efficiency, reduction in water pollution, easy storage of sericin as well as high quality fibers, this approach is of great potential for silk wet processing.
Developing highly efficient, inexpensive, and stable electrocatalysts for hydrogen evolution reaction (HER) is indispensable to building a sustainable and large-scale hydrogen conversion system. In this work, we designed a ternary NiVFe layered double hydroxide nanosheet on porous nickel foam via hydrothermal method to prepare a self-supporting electrocatalyst and co-doped with boron and phosphorus which control the electronic structure of the nanosheets. Simultaneous, the B-P co-doping formation numerous defects and amorphous regions on the nanosheet, which guarantees efficient active sites and enhanced active surface area. As expected, the electrochemical test of HER results shows that the NiVFe-B-P LDHs@NF requires an overpotentials of 117 mV at a current density of 10 mA·cm −2 in the 1.0 M KOH electrolyte without iR compensation, as well as exhibits excellent stability of 24 h at current densities of 10 mA·cm −2 and 50 mA·cm −2 , respectively. Moreover, evaluation of wettability shows that the electrocatalyst has excellent superhydrophilicity and superaerophobicity. We expect the results of this work provides a fresh perspective for double-nonmetal co-doping electrocatalysts with efficient hydrogen generation.
危险品化学品经营许可证（带存储）