Journal of Colloid and Interface Science ( IF 9.9 ) Pub Date : 2020-11-30 , DOI: 10.1016/j.jcis.2020.11.097 Shunling Li 1 , Lei Li 2 , Xinwei Wen 1 , Xiaoqiang Yang 1 , Xiaoling Shi 2 , Qing Qu 1
Although bio-inspired designs for ultrasmall metal nanoparticles (NPs) are likely to play an important role in exploring future heterogeneous catalysis materials, synthesizing these structures while retaining surface activity and avoiding aggregation is challenging. Inspired by the Morchella with the spatially and well-organized porous structures, we proposed a biological strategy to yield NPs with ultrasmall and highly dispersed while maintaining high catalytic activity through surfactin self-assembly. Here, multifunctional Morchella-like biological pores (MBP) nanomaterials (~28 nm) with reduction and encapsulation has been synthesized by surfactin self-assembly, then, ultrasmall PtPd (~2.90 nm) and Pd NPs (~2.87 nm) with coordinated sizes and well-dispersed have been successfully reduced and encapsulated inside the MBP. Notably, the synthesis possesses distinct advantages such as mild reaction conditions, strong controllability, good biological compatibility, low-toxicity and environmental friendliness. The as-prepared MBP-encapsulated ultrasmall PtPd and Pd NPs (M@MBP NPs) exhibited excellent catalytic activity and toxicity resistance for the ethanol oxidation reaction (EOR) in KOH, due to the synergistic effect of MBP and ultrasmall metal NPs. The current density of PtPd@MBP and Pd@MBP NPs were 3.35 and 2.72 A mg−1, respectively. Such MBP synthesized and encapsulated nanoparticles open a new frontier for the design and preparation of NPs for various applications, such as catalysis, bioremediation and drug delivery.
中文翻译:
超小Pd和PtPd纳米颗粒,可通过预先设计的Morchella启发的包封进行高效催化
尽管针对超小金属纳米颗粒(NPs)的生物启发设计可能在探索未来的多相催化材料中发挥重要作用,但是在保留表面活性和避免聚集的同时合成这些结构是具有挑战性的。受具有空间和组织良好的多孔结构的羊肚菌的启发,我们提出了一种生物学策略,以生产具有超小且高度分散的NP,同时通过表面活性素自组装保持高催化活性。在这里,多功能羊肚菌表面活性剂自组装合成了具有还原和包封作用的类生物孔(MBP)纳米材料(〜28 nm),然后合成了尺寸一致且分散良好的超小PtPd(〜2.90 nm)和Pd NP(〜2.87 nm)已成功减少并封装在MBP内。值得注意的是,该合成具有明显的优点,例如反应条件温和,可控性强,生物相容性好,低毒性和环境友好。由于MBP和超小型金属NPs的协同作用,所制备的MBP封装的超小型PtPd和Pd NPs(M @ MBP NPs)在KOH中对乙醇氧化反应(EOR)表现出优异的催化活性和抗毒性。PtPd @ MBP和Pd @ MBP NP的电流密度分别为3.35和2.72 A mg -1, 分别。此类MBP合成和封装的纳米颗粒为NPs的设计和制备提供了新的领域,这些NPs用于各种应用,例如催化,生物修复和药物递送。