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首页> 外文期刊>RSC Advances >Packed hybrid silica nanoparticles as sorbents with thermo-switchable surface chemistry and pore size for fast extraction of environmental pollutants
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Packed hybrid silica nanoparticles as sorbents with thermo-switchable surface chemistry and pore size for fast extraction of environmental pollutants

机译：填料杂化二氧化硅纳米颗粒作为吸附剂，具有可热切换的表面化学性质和孔径，可快速提取环境污染物

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Thermoresponsive poly(N-isopropylacrylamide)-grafted silica nanoparticles (SiNPs) have been synthesized and fully characterized by ATR-FTIR, TGA, HRTEM, BET and DLS analysis. Hybrid solid phase extraction (SPE) beds with tuneable pore size and switchable surface chemistry were prepared by packing the polymer-grafted nanoparticles inside SPE cartridges. The cartridges were tested by checking the thermo-regulated elution of model compounds, namely methylene blue, caffeine and amoxicillin. Extraction of the analytes and regeneration of the interaction sites on the sorbent surface was carried out entirely in water solution by changing the external temperature below and above the lower critical solution temperature (LCST) of the polymer. The results demonstrate that the elution of model compounds depends on the temperature-regulated size of the inter-particle voids and on the change of surface properties of the PNIPAM-grafted nanoparticles from hydrophilic to hydrophobic.
机译：合成了热响应性聚（ N -异丙基丙烯酰胺）接枝的二氧化硅纳米粒子（SiNPs），并通过ATR-FTIR，TGA，HRTEM，BET和DLS分析对其进行了全面表征。通过将聚合物接枝的纳米颗粒填充在SPE弹药筒中，可以制备具有可调孔径和可切换表面化学性质的混合固相萃取（SPE）床。通过检查模型化合物（即亚甲基蓝，咖啡因和阿莫西林）的温度调节洗脱来测试墨盒。通过在聚合物的下临界溶液温度（LCST）以下和以下改变外部温度，可以完全在水溶液中进行分析物的提取和吸附剂表面上相互作用位点的再生。结果表明，模型化合物的洗脱取决于温度调节颗粒间空隙的大小以及PNIPAM接枝纳米颗粒从亲水性到疏水性的表面性质的变化。

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