化工进展 ›› 2025, Vol. 44 ›› Issue (7): 4223-4232.DOI: 10.16085/j.issn.1000-6613.2024-0925

• 资源与环境化工 • 上一篇    

氮自掺杂蓝藻生物质基活性炭的制备及其CO2吸附性能

秘一芳1(), 王保国1, 王文强1, 孙国金2, 曹志海1()   

  1. 1.浙江理工大学先进纺织材料与制备技术教育部重点实验室,浙江 杭州 310018
    2.浙江水利水电学院水利与环境工程学院,浙江 杭州 310018
  • 收稿日期:2024-06-06 修回日期:2024-07-08 出版日期:2025-07-25 发布日期:2025-08-04
  • 通讯作者: 曹志海
  • 作者简介:秘一芳(1990—),女,副研究员,研究方向为功能微纳材料。E-mail:myf@zstu.edu.cn
  • 基金资助:
    国家重点研发计划(2022YFE0128600)

Preparation of nitrogen self-doped cyanobacterial biomass-based activated carbon for CO2 adsorption

MI Yifang1(), WANG Baoguo1, WANG Wenqiang1, SUN Guojin2, CAO Zhihai1()   

  1. 1.Key Laboratory of Advanced Textile Materials and Manufacturing Technology, Ministry of Education, Zhejiang Sci-Tech University, Hangzhou 310018, Zhejiang, China
    2.School of Water Conservancy & Environment Engineering, Zhejiang University of Water Resources and Electric Power, Hangzhou 310018, Zhejiang, China
  • Received:2024-06-06 Revised:2024-07-08 Online:2025-07-25 Published:2025-08-04
  • Contact: CAO Zhihai

摘要:

碳捕集、利用与封存(carbon capture, utilization and storage,CCUS)是解决二氧化碳过度排放的有效方法。本文以蓝藻(cyanobacteria,CB)为前体,氯化锌(zinc chloride,ZnCl2)为活化剂,通过热解活化法制备N自掺杂CB基活性炭(AC-X),用于CO2的高效吸附。探讨了活化温度对AC-X比表面积、孔结构、氮(N)原子分数及含N官能团种类的影响,研究了AC-X在0℃和25℃下对CO2的吸附能力。结果表明,在锌炭比为1.5、活化温度为700℃时,AC-7有最佳的孔隙结构,比表面积为1112.28m2/g,孔体积和微孔体积可达0.82cm3/g和0.52cm3/g。0℃时AC-7对CO2的吸附效果最佳,为140.45mg/g;当CO2吸附温度为25℃时,活化温度为600℃所得的AC-6对CO2的吸附效果最佳,为95.74mg/g,优于AC-7(90.17mg/g)。25℃时AC-6表现出更好的CO2吸附能力,这得益于AC-6高吡咯N和吡啶N原子分数。通过相关性研究表明,比表面积、微孔体积以及吡咯N和吡啶N的原子分数共同决定了AC-X的CO2吸附性能。本研究不仅为CB生物质资源化利用提供了一种有效方法,而且设计的N自掺杂CB基活性炭可高效捕集CO2,助力双碳目标的实现。

关键词: 蓝藻, 活性炭, 二氧化碳捕集, 吸附, 生物质

Abstract:

Carbon capture, utilization, and storage (CCUS) technology is an effective solution to address excessive carbon dioxide (CO2) emissions. Cyanobacteria (CB) is a widely distributed, accessible, and nitrogen (N)-enriched biomass resource. In this work, nitrogen (N) self-doped activated carbons (AC-X) were prepared via pyrolysis of CB with the aid of zinc chloride (ZnCl2). The effects of specific surface area, pore structure, N content, types of N-containing functional groups, and adsorption temperatures on the adsorption capacity of AC-X for CO2 were investigated. The results showed that AC-7 possessed a large specific surface area (1112.28m2/g), the highest pore volume (0.82cm3/g) and micropore volume (0.52cm3/g) when the mass ratio of ZnCl2/activated carbon was 1.5 and the activation temperature was 700℃. The optimal CO2 sorption capacity of AC-7 at 0℃ was 140.45mg/g. At 25℃, the CO2 sorption capacity of AC-6 was 95.74mg/g, superior to that of AC-7 (90.17mg/g), which was beneficial from the high content of pyrrole N and pyridine N in AC-6. The correlation study showed that the specific surface area, the micropore volume, and the content of pyrrole N and pyridine N collectively determined the CO2 adsorption performance of AC-X. This study not only provided an effective method for the resource utilization of CB biomass but also provided N self-doped CB-based activated carbons which could efficiently capture CO2.

Key words: cyanobacteria, activated carbon, CO2 capture, adsorption, biomass

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