Thermoresponsive polymer brush photocatalytic substrates for wastewater remediation
Thermoresponsive polymer brush photocatalytic substrates for wastewater remediation
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DOI：
10.1039/d3py00248a
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发表时间：
2023-05-15
影响因子：
4.6
通讯作者：
Pester，Christian W.
中科院分区：
文献类型：
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作者：
Bell，Kirsten;Guo，Yiwen;Pester，Christian W.
介绍了一种多响应型微米级多相催化剂的合成和表征。温度敏感型单体N-异丙基丙烯酰胺(NIPAAm)通过表面引发的可逆加成-断裂链转移(SI-RAFT)聚合与光活性染料荧光素o-丙烯酸酯(FLA)在不同的厚度(即相对分子质量)下共聚。由此得到的聚(FLA-co-NIPAAm)共聚物刷在24℃到26℃之间经历了快速的结构变化，这显著改变了所掺入的荧光素的光催化行为。通过一个废水处理实例，研究了温度与膜厚之间的关系。值得注意的是，提高反应温度高于较低的临界溶液温度(LCST)提高了对四环素盐酸盐(TC)的降解性能，最厚的光催化剂聚合物刷子表现出最明显的温度响应。
Synthesis and characterization of a multi-responsive micron-scale heterogeneous catalyst are described. The temperature-responsive monomer N-isopropylacrylamide (NIPAAm) is copolymerized with the photo-active dye fluorescein o-acrylate (FlA) via surface-initiated reversible addition–fragmentation chain transfer (SI-RAFT) polymerization at varying thicknesses (i.e., molecular weights). The resulting poly(FlA-co-NIPAAm) copolymer brushes were found to undergo a rapid structural change between 24 and 26 °C, which significantly alters the photocatalytic behavior of the incorporated fluorescein. A wastewater treatment application was implemented to study the effect between temperature and film thickness. Notably, increasing the reaction temperature above the lower critical solution temperature (LCST) increased the performance in the degradation of tetracycline hydrochloride (TC) with the thickest of the photocatalyst polymer brushes showing the most pronounced temperature response.