Preparation of kapok-polyacrylonitrile core-shell composite microtube and its application as gold nanoparticles carrier
Preparation of kapok-polyacrylonitrile core-shell composite microtube and its application as gold nanoparticles carrier
复制标题
木棉-聚丙烯腈核壳复合微管的制备及其作为金纳米颗粒载体的应用
DOI：
10.1016/j.apsusc.2011.10.151
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发表时间：
2012-01-15
影响因子：
6.7
通讯作者：
Xu, Jian
中科院分区：
文献类型：
--
作者：
Fan, Haosen;Yu, Xiaolan;Xu, Jian
以天然木棉纤维为原料，制备了一种新型催化剂载体木棉-聚丙烯腈(PAN)复合微管。采用十六烷基三甲基溴化铵(CTAB)辅助自组装法制备了木棉-聚丙烯腈核壳复合微管。提出了木棉的形成机理，考察了丙烯腈(AN)单体和CTAB浓度对木棉形态的影响。聚丙烯腈纳米粒子聚集体形成的聚丙烯腈包覆层提高了木棉微管的亲水性和比表面积。用硼氢化钠(NaBH4)原位还原氯金酸(HAuCl4)，将金纳米粒子(Au NPs)固定在木棉-PAn微管表面。所制得的Au纳米粒子平均粒径为3.1 nm，分散良好，无团聚现象。此外，木棉-PAN-Au复合材料表现出良好的催化活性，在不明显降低活性的情况下易于回收，通过NaBH4将4-硝基苯酚还原为4-氨基苯酚证明了这一点。木棉-聚丙烯腈复合微管有望成为开发低成本、高效率的金属纳米粒子催化剂载体的载体材料之一。(C)2011爱思唯尔B.V.保留所有权利。
In this article, a new catalyst carrier kapok-polyacrylonitrile (PAN) composite microtube was fabricated based on the natural kapok fiber. Kapok-PAN core-shell composite microtubes were prepared by a cetyltrimethylammonium bromide (CTAB) assisted self-assembly method. The formation mechanism was proposed and the influence of the concentration of acrylonitrile (AN) monomer and CTAB on the morphology of kapok-PAN was investigated. The hydrophilicity and specific surface area of kapok microtubes were improved because of the outside PAN coating constructed by the PAN nanoparticles aggregation. Gold nanoparticles (Au NPs) were immobilized on the surface of kapok-PAN microtubes via in situ reduction of chloroauric acid (HAuCl4) by sodium borohydride (NaBH4). The obtained Au NPs with mean diameter of 3.1 nm were well dispersed without any aggregation. In addition, kapok-PAN-Au composites exhibited excellent catalytic activity and could be recovered easily without apparent decrease of activity, as demonstrated via the reduction of 4-nitrophenol to 4-aminophenol by NaBH4. The kapok-PAN composite microtubes may be one of the promising supporting materials in developing low-cost, high-efficiency catalyst carriers for metal NPs. (C) 2011 Elsevier B.V. All rights reserved.