Polyacrylonitrile-based electrospun nanofibers carrying gold nanoparticles in situ formed by photochemical assembly
Polyacrylonitrile-based electrospun nanofibers carrying gold nanoparticles in situ formed by photochemical assembly
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DOI：
10.1007/s10853-014-8161-z
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发表时间：
2014-03
影响因子：
4.5
通讯作者：
Koichi Sawada;S. Sakai;M. Taya
中科院分区：
文献类型：
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作者：
Koichi Sawada;S. Sakai;M. Taya
通过静电纺丝含有 HAuCl4 的 PAN 溶液和紫外线 (UV) 照射诱导原位金形成相结合，制备了负载金纳米粒子 (AuNP) 的聚丙烯腈 (PAN) 纳米纤维织物。首先研究了控制 AuNPs 直径的因素，然后提出了它们在使用所获得的纤维进行催化反应中的适用性。 Au 的初始含量范围为 3 至 21 wt%，对 PAN 纤维中/上形成的 AuNP 的尺寸没有产生显着影响，在 5 天的紫外线照射下，其直径为 4.7–5.4 nm。另一方面，随着紫外线照射时间从 5 天到 1 天的变化，形成的 AuNP 的尺寸从 5.2 nm 变化到 2.7 nm。在以 AuNPs 为催化剂的纤维体积一定的情况下，随着 Au 含量从 3、13 wt% 增加到 21 wt%，4-硝基苯酚还原的一级速率常数从 1.1 × 10−3、3.5 × 10−3 增加到 4.0 × 10−3s−1。通过 1 天的紫外线照射获得的 AuNP 尺寸减小的 PAN 催化剂具有 2.7 × 10−2s−1 的较高速率常数。本研究中获得的每 Au 含量的最高速率常数和周转频率分别为 8.3 × 10−2s−1μmol-Au−1 和 71 h−1。
Polyacrylonitrile (PAN) nanofibrous fabrics carrying gold nanoparticles (AuNPs) were prepared via the combination of electrospinning of PAN solution containing HAuCl4and in situ gold formation induced by ultraviolet (UV) irradiation. The factors to control the diameter of AuNPs were first investigated, and then their applicability to catalytic reaction using the obtained fibers was presented. The initial contents of Au ranging from 3 to 21 wt% did not exert a significant effect on the size of AuNPs formed in/on the PAN fibers, giving 4.7–5.4 nm in diameter, for 5 days of UV irradiation. On the other hand, the sizes of formed AuNPs were found to change from 5.2 to 2.7 nm with varying UV irradiation time from 5 to 1 day. The first-order rate constants obtained for the reduction of 4-nitrophenol increased from 1.1 × 10−3, 3.5 × 10−3to 4.0 × 10−3s−1, under a fixed volume of the fibers with AuNPs as catalysts, with increasing content of Au from 3, 13 to 21 wt%. The PAN catalysts with decreased size of AuNPs obtained through 1 day of UV irradiation gave a higher rate constant of 2.7 × 10−2s−1. The highest rate constant per Au content and turnover frequency obtained in this study were 8.3 × 10−2s−1μmol-Au−1and 71 h−1, respectively.