低温等离子体改性活性炭纤维对不同极性苯系物的吸附

发布时间：2018-01-09 14:23

本文关键词：低温等离子体改性活性炭纤维对不同极性苯系物的吸附　出处：《环境工程学报》2016年11期 　论文类型：期刊论文

【摘要】：探究了不同改性时间下的活性炭纤维孔结构和表面化学性质的变化,并进一步研究了改性后的活性炭纤维对不同极性苯系物的吸附。通过BET比表面积、Boehm滴定分析、FTIR红外光谱对改性前后的活性炭纤维进行表征。结果表明,功率150 W,改性时间为30、60和90 min时,活性炭纤维烧失率随着改性时间延长而升高,分别达到16.5%、27.8%、45.5%。改性过程中,活性炭纤维比表面积和微孔孔容显著增加,有助于改善活性炭纤维吸附性能。在物理吸附和化学吸附作用下,改性活性炭纤维对邻二甲苯、间二甲苯和对二甲苯吸附性能有所提高,其中,改性90 min活性炭纤维对其吸附量分别增加了0.58、0.55和0.44 mg·mg-1。酸性含氧基团由原来的0.973 mmol·g-1增加到1.675 mmol·g-1,改性后酸性含氧官能团的增加使活性炭纤维表面极性增大,有利于对极性有机物邻、间二甲苯吸附量增加率的提高。
[Abstract]:To explore the changes of time of the activated carbon fiber pore structure and surface chemical properties of different changes, and further study of the adsorption of different polarity of benzene on activated carbon fiber modified by BET surface area, Boehm titration analysis, the modified activated carbon fiber before and after FTIR were characterized with infrared spectrum. The results show that the power of 150 W, the modified time is 30,60 and 90 min, activated carbon fiber loss rate increased with the modification time, reached 16.5% and 27.8% respectively, 45.5%. modified process of activated carbon fiber specific surface area and pore volume increased significantly, helps to improve the adsorption performance the activated carbon fiber. The physical adsorption and chemical adsorption, modified activated carbon fiber of o-xylene, m-xylene and p-xylene adsorption increased, among them, 90 min modified activated carbon fiber on the adsorption capacity were increased by 0.58,0.55 and 0.44 mg mg- 1., the acidic oxygen containing group increased from 0.973 mmol to g-1 1.675 mmol g-1. The surface polarity of activated carbon fiber increased with the increase of acidic oxygen functional group, which was beneficial to the increase of the adsorption rate of polar organic matter o-xylene.

【作者单位】：污染控制与资源化研究国家重点实验室南京大学环境学院;
【基金】：国家水体污染控制与治理科技重大专项(2014ZX07204-008)
【分类号】：TQ424.1;X505
【正文快照】： 活性炭纤维(activated carbon fiber,ACF)是一种新型的多孔吸附材料,其微孔均匀分布于纤维表面。与活性炭相比,活性炭纤维微孔孔径小而均匀,结构简单,对于吸附小分子物质吸附速率快,吸附速度高,容易解吸附[1]。与被吸附物的接触面积大,且可以均匀接触与吸附,使吸附材料得以充

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