Easy Synthesis of Surface-Tunable Carbon-Encapsulated Magnetic Nanoparticles: Adsorbents for Selective Isolation and Preconcentration of Organic Pollutants
Easy Synthesis of Surface-Tunable Carbon-Encapsulated Magnetic Nanoparticles: Adsorbents for Selective Isolation and Preconcentration of Organic Pollutants
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轻松合成表面可调碳包封磁性纳米颗粒：用于选择性分离和预富集有机污染物的吸附剂
DOI：
10.1021/am201336n
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发表时间：
2012-01-01
影响因子：
9.5
通讯作者：
Cai, Yaqi
中科院分区：
文献类型：
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作者：
Niu, Hongyun;Wang, Yixuan;Cai, Yaqi
以无机盐和葡萄糖溶液为前驱体，用简单的方法制备了核/壳结构碳包封磁性纳米粒子（CMNPs）。合成过程不需要使用有机溶剂。我们利用x射线光电子能谱、红外能谱、x射线衍射和拉曼分析对不同温度下制备的CMNPs的表面性质进行了研究。随着热处理温度的升高，碳纳米管碳壳的比表面积、磁化强度和石墨化碳含量均增加。所得CMNPs用于吸附或预浓缩水样中的双酚A （BPA）、4-n-壬基苯酚（4-NP）、4-叔辛基苯酚（4-OP）、邻苯二甲酸二乙酯（DEP）、邻苯二甲酸二丙酯（DPP）、邻苯二甲酸二丁酯（DBP）、邻苯二甲酸二环己酯（DCHP）、邻苯二甲酸二辛酯（DOP）、磺胺、四环素类和喹诺酮类抗生素有机化合物。分析物的吸附主要基于pi-pi堆叠相互作用、疏水相互作用和分析物与石墨碳之间的氢键。因此，CMNPs对被分析物的吸附或萃取行为受其碳壳上含氧物质和石墨化碳含量的控制。在200℃条件下制备的CMNPs表面含有丰富的含氧物质（80%），有利于喹诺酮类抗生素的吸附和提取。在300-500℃下加热，碳壳石墨化效率低于50%的cmpps对BPA、4-NP、4-OP、DBP、DCHP、DOP、四环素和喹诺酮类抗生素具有良好的预富集性能。850℃下制备的CMNPs石墨化程度高（80%），对所有模型分析物都有很强的吸附亲和力；然而，由于其他模型分析物的硬解吸，它们只能定量提取高极性磺胺类抗生素和中极性DEP、DPP。我们认为，通过这种技术，只需调整加热温度，无需任何后处理，就可以获得适当的有机污染物吸附剂。
We have prepared core/shell structured carbon-encapsulated magnetic nanoparticles (CMNPs) with a simple method by using inorganic iron salt and glucose solution as precursor substance. The synthetic procedure does not require the use of organic solvents. We have utilized X-ray photoelectron spectroscopy, infrared spectroscopy, X-ray diffraction, and Raman analysis to examine the surface properties of CMNPs prepared at different temperature. The specific surface areas, magnetization and contents of graphitized carbon on carbon shell of CMNPs increase with heat treatment temperature. The obtained CMNPs are used to adsorb or preconcentrate bisphenol A (BPA), 4-n-nonylphenol (4-NP), 4-tert-octylphenol (4-OP), diethyl phthalate (DEP), dipropyl phthalate (DPP), dibutyl phthalate (DBP) dicyclohexyl phthalate (DCHP), dioctyl phthalate (DOP), sulfonamide, tetracyclines, and quinolones antibiotics organic compounds from water samples. The adsorption of analytes is mainly based on pi-pi stacking interaction, hydrophobic interaction and hydrogen bonds between analytes and graphitic carbon. As a result, the adsorption or extraction behaviors of CMNPs to analytes are controlled by the content of oxygen-containing species and graphitized carbon on carbon shell of CMNPs. CMNPs prepared at 200 degrees C have ample oxygen-containing species (80%) on surface and favor the adsorption and extraction of quinolones antibiotics. CMNPs heated at 300-500 degrees C with the graphitization efficiency of carbon shell lower than 50% exhibit great preconcentration performance to BPA, 4-NP, 4-OP, DBP, DCHP, DOP, tetracyclines, and quinolones antibiotics. CMNPs prepared at 850 degrees C are highly graphitized (80%) and have strong adsorption affinity to all model analytes; however, they can quantitatively extract only highly polar sulfonamide antibiotics and moderately polar DEP, DPP because of hard desorption of other model analytes. We suggest that the appropriate adsorbent to certain organic contaminants can be obtained with this technique just by tuning the heat temperature without any post-treatment.