纤维素/丝素蛋白复合水凝胶作为金纳米粒子的选择性载体:合成和催化应用研究  

Cellulose/silk Fibroin Composite Hydrogels as Selective Support Carriers of Gold Nanoparticles:Synthesis and Catalytic Application Research

作　　者：薛新新 邹光龙[1] XUE Xin-xin;ZOU Guang-long(School of Chemical Engineering,Guizhou Minzu University,Guiyang 550025,China)

机构地区：[1]贵州民族大学化学工程学院,贵州贵阳550025

出　　处：《化学试剂》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)。

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.

关 键 词：纤维素 丝素蛋白 水凝胶 金纳米粒子 催化过程 4-硝基苯酚 

分 类 号：O643.3[理学—物理化学]