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碳纳米管经焙烧和稀硝酸纯化处理后,在相同的实验条件下,采用Fenton试剂产生的·OH分别对CVD法合成的两种制备条件不同的多壁碳纳米管进行氧化改性处理。红外光谱(FT IR)表明,改性后的两种碳管结构中都引入了羟基、羰基和羧基等含氧官能团。此外,由于制备条件不同,导致它们的石墨化程度、缺陷含量和抗氧化能力等性质也不同,因此CVD法制备条件能够对碳管Fenton氧化改性结果产生重要影响。机理分析表明,这些含氧官能团可以看作是具有强亲电性和强氧化性的·OH对碳管上缺陷位置和不饱和键进行攻击的结果。
After the carbon nanotubes were roasted and purified by dilute nitric acid purification, the two kinds of multiwalled carbon nanotubes with different preparation conditions synthesized by the CVD method were oxidized and modified by · OH produced by the Fenton reagent under the same experimental conditions. Infrared spectroscopy (FT-IR) showed that oxygen-containing functional groups such as hydroxyl, carbonyl and carboxyl groups were introduced into the modified carbon nanotubes. In addition, due to different preparation conditions, their graphitization degree, defect content and antioxidant capacity are also different. Therefore, the preparation conditions of CVD method can have a significant impact on the results of the Fenton oxidation of carbon nanotubes. The mechanism analysis shows that these oxygen-containing functional groups can be regarded as the result of attacking the defect positions and unsaturated bonds on the carbon nanotubes by · OH with strong electrophilicity and strong oxidation.