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
-
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.
-
-
[1] LAHAYE J Q.The chemistry of carbon surface[J].Fuel,1998,77(6):543-547 10.1016/S0016-2361(97)00099-9 [2] 蒋昕楠, 孔振凯, 王际童, 等. 高锰酸钾改性球形中孔炭的甲醛吸附性能[J]. 环境工程学报,2018,12(6):1676-1682 10.12030/j.cjee.201712079 [3] 唐运雪. 有机废气处理技术及前景展望[J]. 湖南有色金属,2005,21(5):31-35 [4] 徐秋健. 室内VOC净化材料吸附与反应机理、特性及评价研究[D]. 北京：清华大学,2011 [5] 刘勇军，王维竹，巩梦丹. 氮表面修饰活性炭纤维的脱硫性能[J]. 四川大学学报（工程科学版）,2014,46(6):173-176 [6] 柴春玲，孙艺飞，张建军，等. 活性碳纤维吸附废气中的丙烯酸和甲苯[J]. 化工环保,2010,30(5):383-386 [7] 商红岩，吴明铂.KOH活化制备高比表面积窄孔径分布的活性炭纤维的研究[J]. 碳素材料,1999(5):9-13 [8] 李坤权，李烨，郑正. 高比表面积生物质炭的制备、表征及吸附性能[J]. 环境科学,2013,34(1):238-335 [9] 李开喜，凌立成，刘朗，等. 含氮沥青基活性炭纤维的制备[J]. 炭素技术,1998(4):4-8 [10] 陆安慧，郑经堂，王茂章. 高比表面积PAN-ACF的吸附与孔结构解析[J]. 高分子材料科学与工程,2001(5):62-66 [11] SINGH K P, MOHAN D, TANDON G S.Vapor-phase adsorption of hexane and benzene on activated carbon fabric cloth: Equilibria and rate studies[J].Industrial & Engineering Chemistry Research,2002,41(10):2480-2486 10.1021/ie0105674 [12] 孙康，蒋剑春，卢辛成，等. 表面掺氮活性炭的制备及其甲醛吸附性能研究[J]. 林产化学与工业,2014,34(4):77-82 [13] NIWA H, KOBAYASHI M, HORIBA K, et al.X-ray photoemission spectroscopy analysis of N-containing carbon-based cathode catalysts for polymer electrolyte fuel cells[J].Journal of Sources,2011,196(3):1006-1011 10.1016/j.jpowsour.2010.08.054 [14] FIGUEIREDOJ L, PEREIRA M F R, FREITAS M M A.Modification of the surface chemistry of activated carbons[J].Carbon,1999,37(9):1379-1389 10.1016/S0008-6223(98)00333-9 [15] 张文彬，左宋林，王宜望. 氨气改性活性炭表面含氮官能团的形成与演变[J]. 林产化学与工业,2017,37(2):35-41 [16] DARMSTADT H, ROY C.Surface spectroscopic study of basic sites on carbon blacks[J].Carbon,2003,41(13):2662-2665 10.1016/S0008-6223(03)00325-7 -
点击查看大图
计量
- 文章访问数: 2231
- HTML全文浏览数: 2087
- PDF下载数: 199
- 施引文献: 0
下载:
