Ohkubo Yuji, Aoki Tomonori, Seino Satoshi, Mori Osamu, Ito Issaku, Endo Katsuyoshi, Yamamura Kazuya
Graduate School of Engineering, Osaka University, Suita, Osaka 565-0871, Japan.
Menicon Co., Ltd., Kasugai, Aichi 487-0032, Japan.
Nanomaterials (Basel). 2019 Mar 3;9(3):342. doi: 10.3390/nano9030342.
In a previous study, Pt nanoparticles were supported on a substrate of acrylonitrile⁻butadiene⁻styrene copolymer (ABS) to give the ABS surface catalytic activity for H₂O₂ decomposition during contact lens cleaning. Although the Pt-particle/ABS catalysts exhibited considerably high specific catalytic activity for H₂O₂ decomposition, the catalytic activity decreased with increasing numbers of repeated usage, which meant the durability of the catalytic activity was low. Therefore, to improve the catalytic durability in this study, we proposed two types of pretreatments, as well as a combination of these treatments before supporting Pt nanoparticles on the ABS substrate. In the first method, the ABS substrate was etched, and in the second method, the surface charge of the ABS substrate was controlled. A combination of etching and surface charge control was also applied as a third method. The effects of these pretreatments on the surface morphology, surface chemical composition, deposition behavior of Pt particles, and Pt loading weight were investigated by scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), cross-sectional SEM, and inductively coupled plasma atomic emission spectroscopy (ICP-AES), respectively. Both etching and controlling the surface charge effectively improved the catalytic durability for H₂O₂ decomposition. In addition, the combination treatment was the most effective.
在先前的一项研究中，将铂纳米颗粒负载在丙烯腈-丁二烯-苯乙烯共聚物（ABS）基材上，以使ABS表面在隐形眼镜清洁过程中具有催化过氧化氢分解的活性。尽管铂颗粒/ABS催化剂对过氧化氢分解表现出相当高的比催化活性，但随着重复使用次数的增加，催化活性会降低，这意味着催化活性的耐久性较低。因此，为了提高本研究中的催化耐久性，我们提出了两种预处理方法，以及在将铂纳米颗粒负载到ABS基材之前将这些处理方法进行组合。在第一种方法中，对ABS基材进行蚀刻，在第二种方法中，控制ABS基材的表面电荷。还应用蚀刻和表面电荷控制的组合作为第三种方法。分别通过扫描电子显微镜（SEM）、X射线光电子能谱（XPS）、截面SEM和电感耦合等离子体原子发射光谱（ICP-AES）研究了这些预处理对表面形态、表面化学成分、铂颗粒的沉积行为和铂负载量的影响。蚀刻和控制表面电荷均有效地提高了过氧化氢分解的催化耐久性。此外，组合处理最为有效。
