摘要
展示了一种以乙酰丙酸基质子型离子液体(Lev-PILs)为溶剂制备纤维素/丝素蛋白复合水凝胶(CSH)的新工艺。并利用水凝胶在负载贵金属纳米粒子上的优势,实现了在CSH中原位负载Au纳米粒子,最终得到3种不同比例的CSH@Au复合材料。通过扫描电子显微镜(SEM)、透射电子显微镜(TEM)、能量色散X射线光谱(EDX)、X射线衍射(XRD)和电感耦合等离子体发射光谱(ICP-OES)等一系列手段对复合材料的性质进行了研究,结果表明CSH对金纳米粒子具有良好的固定能力和选择性吸附能力。将制备的CSH@Au复合材料用来催化水中污染物——对硝基苯酚(4-Np)的还原反应。结果显示,CSH@Au复合材料具有优异的催化性能和循环使用性能。此外,对该反应的动力学进行了深入的研究,最终活化参数通过计算可得E_(a)=20.71 kJ/mol,ΔH^(#)=17.84 kJ/mol和ΔS^(#)=-268.0 J/(mol·K)。丝素蛋白在水凝胶中的存在被证明是稳定金纳米颗粒的关键因素,这是由于金属和载体之间的相互作用,利用这种方法可以扩展到制备其他不同用途的纳米颗粒。
A new process for the preparation of cellulose/silk fibroin composite hydrogels(CSH)using levulinate-based protic ionic liquids(Lev PILs)as solvent was demonstrated.Taking advantage of hydrogel in loading noble metal nanoparticles,three different ratios of CSH@Au composites were obtained by in-situ loading of Au nanoparticles in CSH.The properties of the composites were investigated by scanning electron microscopy(SEM),transmission electron microscopy(TEM),energy dispersive X-ray spectroscopy(EDX),X-ray diffraction(XRD)and inductively coupled plasma-atomic emission spectroscopy(ICP-OES).The results showed that CSH had good immobilization and selective adsorption ability for gold nanoparticles.The prepared CSH@Au composites were used to catalyze the reduction reaction of 4-nitrophenol(4-NP),a pollutant in water.Moreover,the prepared composites had excellent catalytic performance and recycling performance.And the kinetics of the reaction were studied in depth,where the activation parameters were calculated to be E_(a)=20.71 kJ/mol,ΔH^(#)=17.84 kJ/mol,and ΔS^(#)=-268.0 J/(mol·K).The presence of silk fibroin in the hydrogel had been proved to be a key factor in stabilizing gold nanoparticles due to the interaction between the metal and the carrier.This method can be extended to the preparation of nanoparticles for other different purposes.
作者
薛新新
邹光龙
XUE Xin-xin;ZOU Guang-long(School of Chemical Engineering,Guizhou Minzu University,Guiyang 550025,China)
出处
《化学试剂》
CAS
北大核心
2022年第12期1738-1746,共9页
Chemical Reagents
基金
国家自然科学基金资助项目(21363004)
贵州民族大学自然科学基金项目(GZMUZK[2021]YB04)。
