磁性聚乙二醇/纳米钯复合材料的制备及催化性能  

Preparation and Catalytic Performance of Magnetic Poly( Ethylene Glycol) / Pd Nanocomposite

作　　者：苏松[1,2] 赵鹏翔[2] 周元林[1] 赖新春[1,2] 岳国宗 黄德顺[2] 杨桂英[1,2] 

机构地区：[1]西南科技大学四川省非金属复合与功能材料重点实验室,四川绵阳621010 [2]表面物理与化学重点实验室,四川绵阳621907

出　　处：《高分子材料科学与工程》2015年第12期147-152,158,共7页Polymer Materials Science & Engineering

基　　金：中国工程物理研究院发展基金(2103B0302047);表面物理与化学重点实验室学科发展基金(XK201305)

摘　　要：建立了一种以Fe_3O_4纳米颗粒为磁性中心,通过亲水性聚乙二醇衍生物4-[4-聚乙二醇单甲醚-[1,2,3]三唑-1-基]-苯甲酸(PTBC)对Fe_3O_4表面改性,以PTBC改性后的Fe_3O_4纳米颗粒为载体,原位还原四氯钯酸钠(Na2Pd Cl4)而得到的一种磁性聚乙二醇/纳米钯复合材料Fe_3O_4/PTBC/Pd。并将其用于催化4-硝基苯酚的还原,分别考察相对分子质量为350,500,1000,1900不同链长的聚乙二醇单甲醚(m PEG)对其催化活性的影响。结果表明,Fe_3O_4/PTBC/Pd对4-硝基苯酚(4-NP)的还原表现出高的催化活性,且当m PEG的相对分子质量为500时,催化活性最佳,其催化4-NP还原反应速率常数k=3.8×10-2s^(-1)。此外,该催化剂可通过外加磁场快速分离回收,循环利用6次后催化活性无显著下降。In this work,a magnetic center of Fe3O4nanoparticles（ NPs） was prepared and modified with the hydrophilic polymer 4-[4-polyethylene glycol monomethylether-[1,2,3]triazole-1-yl]-benzoic acid（ PTBC）. Then,this nanoparticle was used as support for Pd NPs to yield the Fe3O4/ PTBC / Pd nanocomposite by reduction of sodium tetrachloropalladate（ II） in situ. Subsequently,the nanocomposite with different methoxypolyethylene glycols（ m PEG）（ m PEG-350,500,1000 and 1900） was investigated in the reduction of 4-nitrophenol,and the results indicate that all these catalysts exhibit an excellent catalytic activity towards 4-nitrophenol reduction,particularly,the Fe3O4/ PTBC / Pd with m PEG-500 show the best capacity among them（ the rate constant is 3. 8 × 10^-2s^-1）. Finally,this catalyst could be easily recycled with an external magnetic field and reused for at least 6 times with no significant decline in activity.

关 键 词：聚乙二醇单甲醚 纳米钯 纳米复合材料 催化活性 循环利用 

分 类 号：TB383[一般工业技术—材料科学与工程]