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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：用热可切换表面化学和孔径填充杂种二氧化硅纳米粒子，用于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：热响应性聚（N-异丙基丙烯酰胺） - 草草纳米颗粒（SINP）已合成，并通过ATR-FTIR，TGA，HRTEM，BET和DLS分析完全表征。 通过将聚合物接枝的纳米颗粒包装在SPE盒内填充来制备具有可调谐孔径和可切换表面化学的杂化固相萃取（SPE）床。 通过检查模型化合物的热调节，即亚甲基蓝，咖啡因和阿莫西林来测试盒式磁带。 通过改变低于聚合物的低临界溶液温度（LCST），完全在水溶液中进行分析物和吸附剂表面上的相互作用位点的分析物和再生。 结果表明，模型化合物的洗脱取决于颗粒间空隙的温度调节尺寸和泊普 - 接枝纳米颗粒的表面性质从亲水性疏水的变化。

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