Packed hybrid silica nanoparticles as sorbents with thermo-switchable surface chemistry and pore size for fast extraction of environmental pollutants.
Packed hybrid silica nanoparticles as sorbents with thermo-switchable surface chemistry and pore size for fast extraction of environmental pollutants.
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DOI：
10.1039/c7ra11869d
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发表时间：
2018-01-02
期刊：
影响因子：
3.9
通讯作者：
Scalarone, Dominique
中科院分区：
文献类型：
--
作者：
Jadhav, Sushilkumar A.;Nistico, Roberto;Magnacca, Giuliana;Scalarone, Dominique
合成了聚（N-异丙基丙烯酰胺）接枝的温敏二氧化硅纳米粒子（SiNPs），并通过ATR-FTIR、TGA、HRTEM、BET和DLS等手段对其进行了表征。通过将聚合物接枝的纳米颗粒填充到固相萃取柱中，制备了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，对笔芯进行检测。通过改变低于和高于聚合物的低临界溶解温度（LCST）的外部温度，完全在水溶液中进行分析物的提取和吸附剂表面上的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的颗粒间空隙的大小和PNIPAM接枝的纳米颗粒的表面性质从亲水性到疏水性的变化。合成了具有温敏性的聚（N-异丙基丙烯酰胺）接枝二氧化硅纳米粒子，并将其用于制备具有可切换孔径和表面化学性质的固相萃取吸附剂，用于水污染物的温控萃取。
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. Thermoresponsive poly(N-isopropylacrylamide)-grafted silica nanoparticles were synthesized and used to prepare solid phase extraction sorbents with switchable pore size and surface chemistry for temperature-regulated extraction of water pollutants.
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