CO2-assisted synthesis of silk fibroin hydrogels and aerogels

Biocompatible and biodegradable porous materials based on silk fibroin (SF), a natural protein derived from the Bombyx mori silkworm, are being extensively investigated for use in biomedical applications including mammalian cell bioprocessing, tissue engineering and drug delivery applications. In this work, low-pressure, gaseous CO₂ is used as an acidifying agent to fabricate SF hydrogels. This low-pressure CO₂ acidification method is compared to an acidification method using high-pressure CO₂ to demonstrate the effect of CO₂ mass transfer and pressure on SF sol–gel kinetics. The effect of SF molecular weight on the sol–gel kinetics is determined using the low-pressure CO₂ method. The results from these studies demonstrate that low-pressure CO₂ processing proves to be a facile method for synthesizing 3-D SF hydrogels.     

石墨烯气凝胶对水中放射性元素钍的吸附特性研究

目的 研究石墨烯气凝胶（GO-A）对钍的吸附特性。方法 采用水热还原组装法制备GO-A，并用扫描电镜（SEM）和傅里叶红外光谱（FT-IR）进行表征，考察其对放射性废水中钍的吸附效果，包括溶液pH、吸附时间、钍初始浓度和温度等影响因素。结果 在pH为3.0、GO-A的用量为20 mg、溶液体积25 ml、25℃振荡4 h的实验条件下，GO-A对钍的最大吸附量为85.8 mg/g。结论 GO-A制备方法简单，环境友好，固液分离方便，对钍具有较高的吸附净化能力，将为含钍放射性废水处理以及环境监测的样品前处理提供新方法和新技术。