红外光谱研究Fenton试剂对多壁碳纳米管表面的影响  

FTIR Study on Effect of Fenton’s Reagents on the Surface of Multi-walled Carbon Nanotubes

作　　者：李伟[1] 成荣明[1] 徐学诚[1] 陈奕卫[1] 孙明礼[1] 何为凡[1] 

机构地区：[1]华东师范大学纳米功能材料和器件应用研究中心,上海200062

出　　处：《Chinese Journal of Chemical Physics》2005年第3期416-420,共5页化学物理学报（英文）

基　　金：ProjectsupportedbytheShanghaiNanotechnologyPromotionCenter(0252nm011).

摘　　要：碳纳米管经焙烧和稀硝酸纯化处理后,在不同实验条件下采用Fenton试剂对多壁碳纳米管进行化学改性,红外光谱(FTIR)结果表明,Fenton试剂化学处理后能够在碳纳米管表面引入羟基和羰基,且羰基峰的吸收强度随着反应时间的增加而增加;碳纳米管的化学处理条件即过氧化氢与亚铁离子物质的量之比、pH值和反应时间等因素能够影响碳纳米管的改性效果;过氧化氢与亚铁离子物质的量之比控制在10左右,pH保持在3,反应10h即能在碳纳米管表面产生较多的羰基.此外,根据Fenton试剂产生羟基自由基的机理和碳纳米管改性前后的FTIR变化,初步分析了Fenton试剂与碳纳米管作用的可能机理.机理分析表明,羟基和羰基的产生是由亲电性的HO·对碳纳米管上的不饱和键进行加成氧化引起的.After purification pretreatment by heating in air and dilute HNO3, multi-walled carbon nanotubes (MWNTs) were treated with Fenton's reagents under different experimental conditions. The results of FTIR spectra confirmed that hydroxyl groups and carbonyl groups could be brought into the MWNTs after Fenton chemical treatment. Moreover, the absorption intensity of carbonyl groups become increasingly stronger along with prolonged time. When MWNTs were treated with Fenton's reagents, the following factors, molar ratio of H2O2 and Fe2+, pH value and reaction time, could affect the modification outcome of MWNTs. Experimental results indicated that when molar ratio of H2O2 and Fe2+ was maintained at 10 and pH value at 3 under acidic condition, more carbonyl groups could be produced on the MWNTs after the treatment was carried out for 10 h. In addition, according to formation mechanism of hydroxyl radical and FTIR spectral changes before and after treatment, the possible mechanism of reaction between Fenton's reagents and MWNTs was discussed. The possible mechanism showed that existence of hydroxyl groups and carbonyl groups could be viewed as the outcome of addition and oxidation reaction of electrophilic hydroxyl radical on unsaturated bonds on the sidewalls of MWNTs.

关 键 词：多壁碳纳米管 FENTON试剂 羟基自由基 机理 

分 类 号：O613.71[理学—无机化学]