玉米芯基氮掺杂活性炭的制备及吸附性能研究

摘要以玉米芯为原料,KOH为活化剂,尿素为氮源来制备氮掺杂活性炭,采用77 K氮气吸附、XRD、XPS、红外、元素分析等来表征活性炭样品,主要考察了尿素添加量和添加阶段对活性炭性能的影响。结果表明,在适宜条件下,氮掺杂活性炭的比表面积可以达到3 000 m²·g^-1以上。在不同阶段添加尿素,所得活性炭具有相近的孔径分布,但由于比表面积和氮含量的不同,使得其对N₂、CH₄和CO₂的吸附性能存在较大差异。尿素的添加可以提高样品中吡咯氮的含量,进而提高活性炭对CO₂的吸附选择性。样品ACNA2在268 K下对CO₂/N₂和CO₂/CH₄的分离系数分别为10.30和3.74,与未进行氮掺杂的活性炭样品AC相比,分离因子分别提高了87.6％和59.8%。

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	刘雨春
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	陈雷

关键词：玉米芯尿素氮掺杂活性炭吸附

Abstract： N-doped activated carbon was prepared from corncob with KOH-activation and urea used as N-doping agent. 77 K nitrogen adsorption isotherm was measured to determine the specific surface area and the pore size distribution. The surface and morphous were analyzed by XRD, XPS, and FT-IR. The effect of urea adding amount and adding stage on the properties of activated carbon was investigated. It was showed that the specific surface area of nitrogen-doped activated carbon can reach higher than 3 000 m²·g^-1. Nitrogen-doped activated carbon with urea added at different stages had similar pore size distribution, when the adsorption performance of N₂, CH₄ and CO₂ was distinct due to the difference in specific surface area and nitrogen content. The addition of urea was beneficial to enhance the adsorption selectivity of activated carbon for CO₂ by increasing the content of pyrrolic nitrogen. The ACNA2 presented the best CO₂ adsorption and separation performance at 268 K. Comparing with the sample AC without adding urea, the separation factor of CO₂/N₂ and CO₂/CH₄ were 10.30 and 3.74, increased by 87.6% and 59.8% respectively.

Keywords： corncob urea nitrogen-doped activated carbon adsorption

Received 2021-12-13;

Corresponding Authors: 苏伟,副教授,E-mail:suweihb@tju.edu.cn。 Email: suweihb@tju.edu.cn

About author: 刘雨春(1997-),女,硕士研究生,现从事生物质氮掺杂活性炭方面的研究。

引用本文:

刘雨春, 苏伟, 孙艳, 赵宇, 朱荣娇, 陈雷.玉米芯基氮掺杂活性炭的制备及吸附性能研究[J]. 化学工业与工程, 2023,40(5): 135-143

LIU Yuchun, SU Wei, SUN Yan, ZHAO Yu, ZHU Rongjiao, CHEN Lei.Preparation of nitrogen-doped activated carbon derived from corncob and adsorption property[J]. Chemcial Industry and Engineering, 2023,40(5): 135-143

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