碱处理和掺氮耦合改性对活性炭纤维吸附甲醛性能的影响
Effect of alkali treatment and nitrogen doping on formaldehyde adsorption on activated carbon fibers
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摘要: 甲醛作为一种常见的挥发有机化合物（VOC），对人体健康构成长期危害。为提高活性炭纤维（ACF）对甲醛等有害气体的吸附去除能力，采用不同浓度的碱处理和不同温度的氮修饰对ACF进行耦合改性，对共同改性后的ACF进行SEM、BET和XPS等分析测试，获得相关物理化学参数，并评价其吸附去除甲醛气体的性能。研究结果表明：碱处理后的ACF获得了发达的微孔结构和较高的比表面积。氮修饰后，ACF表面含氮官能团数量明显提高。改性后的ACF去除甲醛的性能得到了明显的提升，对初始浓度为4 mg·m-3的甲醛去除率高达98%。吸附去除甲醛性能的提高应该归因于比表面积的大幅度提升和表面含氮官能团数量增加的共同作用。Abstract: Formaldehyde, as a common harmful volatile organic compound（VOC）, is chronically harmful to human health. In order to improve the adsorption and removal of formaldehyde or other harmful gas by activated carbon fiber（ACF），ACF was coupling modified by alkali treatment with different concentrations and nitrogen doping at different temperatures in this study. The modified ACF samples were characterized by SEM，XPS and BET，and their performance on formaldehyde removal were also tested. The results show that modified ACF has obtained the advanced microporous structure and high specific surface area under the alkali treatment. After nitrogen doping, the number of surface nitrogen functional group of modified ACF increased. For the modified ACF, its performance on formaldehyde removal has been significantly strengthened, and the removal rate for formaldehyde at initial concentration of 4 mg·m-3 was up to 98%. The enhanced performance on formaldehyde removal should be contributed to the combined functions of a large increase in specific surface area and an increase in the number of nitrogen functional groups on the surface.
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