Improvement of oil adsorption performance by a sponge-like natural vermiculite-carbon nanotube hybrid
Improvement of oil adsorption performance by a sponge-like natural vermiculite-carbon nanotube hybrid
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海绵状天然蛭石-碳纳米管混合物改善油吸附性能
DOI：
10.1016/j.clay.2011.04.003
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发表时间：
2011-07
影响因子：
5.6
通讯作者：
Zhang, Qiang
中科院分区：
文献类型：
--
作者：
Luo, Wei-Liang;Huang, Jia-Qi;Zhao, Meng-Qiang;Wei, Fei;Zhang, Qiang
将碳纳米管（CNT）阵列插入天然蛭石层间，制备了不同CNT含量的膨胀蛭石（EV）/CNT海绵状杂化材料。通过扫描电镜和透射电镜对碳纳米管阵列在EV/CNT杂化材料EV层间的插层生长进行了表征。空气气氛下的热重分析表明，碳纳米管的含量变化的杂交体从11.4%到94.8%，为不同的增长时间。原位汞渗透法测得的孔径分布表明，插入碳纳米管阵列后，杂化材料中形成了大量的孔。N2吸附实验结果表明，与原EV颗粒相比，杂化物的比表面积均得到了显著提高。在烘箱中对一类有机溶剂和油类进行了吸油试验，并在注射器中进行了回收过程。结果发现，由于定向CNT的插层生长产生的大量孔，与原始EV颗粒相比，所获得的海绵状EV/CNT杂化物的吸油能力显著提高。当碳纳米管含量为91.0%时，复合材料对柴油的吸附量最大，达到26.7g/g，且具有良好的循环性能。此外，通过高速剪切将EV/CNT杂化物转化为蓬松的EV/CNT棉，可以将对柴油的吸附容量进一步提高到70.6g/g。
Sponge-like exfoliated vermiculite (EV)/carbon nanotube (CNT) hybrids with different CNT content were prepared by intercalating aligned CNT arrays into natural vermiculite layers for oil adsorption. The intercalated growth of CNT arrays among EV layers of the EV/CNT hybrids was characterized by scanning electron microscopy and transmission electron microscopy. Thermogravimetric analysis under air atmosphere showed that CNT contents of the hybrids varied from 11.4% to 94.8% for different growth duration. Pore size distributions measured by anex-situHg penetration method showed that large amount of pores can be formed in the hybrids after the intercalation of CNT arrays. N2adsorption results showed that the specific surface areas of all hybrids were significantly improved compared with original EV particles. Oil adsorption tests were conducted on a class of organic solvents and oils in baker and the recovery process was carried out in a syringe. It was found that the oil adsorption capacities of the as-obtained sponge-like EV/CNT hybrids were significantly improved compared with original EV particles due to the large quantity of pores produced by the intercalated growth of aligned CNT. The highest adsorption capacity of the EV/CNT hybrids was 26.7 g/g for diesel oil when the CNT content reached 91.0%, which also exhibited good recycling performance. Furthermore, the adsorption capacity for diesel oil can be further increased to 70.6 g/g by transforming the EV/CNT hybrids into fluffy EV/CNT cotton through high-speed shearing.
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