Polymer particles armored with cobalt oxide nanosheets for the catalytic degradation of bisphenol A
Polymer particles armored with cobalt oxide nanosheets for the catalytic degradation of bisphenol A
复制标题
氧化钴纳米片包裹的聚合物颗粒用于催化降解双酚 A
DOI：
10.1039/d1ma00832c
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发表时间：
2022
影响因子：
5
通讯作者：
Pentzer, Emily
中科院分区：
文献类型：
--
作者：
Escamilla, Maria;Pachuta, Kevin;Huang, Kuan;Klingseisen, Michael;Cao, Huaixuan;Zhang, Huichun;Sehirlioglu, Alp;Pentzer, Emily
2D颗粒表面活性剂对于形成高度稳定的乳液和用作模板以制备具有取决于组成的性能特性的复合结构是有吸引力的。钴氧化物纳米片（CON）是一类相对未得到充分研究的2D颗粒表面活性剂，可以通过锂钴氧化物的化学剥离产生，锂钴氧化物是一种过渡金属氧化物，以优异的气敏、催化和电化学性能而闻名。在这里，我们报告了一种简单的方法来获得CON稳定的水包油Pickering乳液，并使用这些作为模板来制备具有聚合物核和CON壳的颗粒。苯乙烯）在水中稳定至少24小时，悬浮自由基聚合用于生产CON-装甲颗粒。通过X射线光电子能谱（XPS），扫描电子显微镜（SEM）和热重分析（TGA）的表征证实了聚合物核表面上存在CON。然后，我们证明了CON-装甲聚合物颗粒可以激活氧化剂过一硫酸盐（PMS）降解双酚A（BPA）。新鲜制备的和人工老化的CON-装甲颗粒在不到一小时内显示出BPA的完全降解，并且在两次使用后没有观察到活性降低。CON-铠装颗粒联合收割机结合了纳米片的高表面积和颗粒的易回收性。
2D particle surfactants are attractive for the formation of highly stable emulsions and use as templates to prepare composite structures with performance properties dependent on the composition. Cobalt oxide nanosheets (CONs) are a relatively understudied class of 2D particle surfactants that can be produced by the chemical exfoliation of lithium cobalt oxide, a transition metal oxide known for excellent gas-sensing, catalytic, and electrochemical properties. Here, we report a simple method to access CONs stabilized oil-in-water Pickering emulsions and use these as templates to prepare particles with a core of polymer and shell of CONs. Salt-flocculated CONs produce emulsions with droplets of hydrophobic monomer (e.g., styrene) in water that are stable for at least 24 hours, and suspension free radical polymerization is used to produce CON-armored particles. Characterization by X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), and thermal gravimetric analysis (TGA) confirmed the presence of CONs on the surface of the polymer core. We then demonstrated the CON-armored polymer particles can activate the oxidant peroxymonosulfate (PMS) for the degradation of bisphenol A (BPA). Freshly prepared and artificially aged CON-armored particles showed full degradation of BPA in less than an hour and no decrease in activity was observed after two uses. CON-armored particles combine high surface area of the nanosheets with the ease of recoverability of the particles.