高等学校化学学报 ›› 2018, Vol. 39 ›› Issue (2): 284.doi: 10.7503/cjcu20170480

• 物理化学 • 上一篇    下一篇

改性蓝藻基活性炭的制备及常压下对CO2的捕集性能

高俊, 胡辉(), 刘雪岩   

  1. 华中科技大学环境科学与工程学院, 武汉 430074
  • 收稿日期:2017-07-19 出版日期:2018-02-10 发布日期:2018-01-11
  • 作者简介:联系人简介: 胡 辉, 男, 博士, 教授, 主要从事大气污染控制、 环境功能材料等方面的研究. E-mail: huhhust@163.com
  • 基金资助:
    教育部高等学校博士学科点基金(批准号: 20110142110065)资助

Preparation and Evaluation of Modified Cyanobacteria-derived Activated Carbon for CO2 Adsorption

GAO Jun, HU Hui*(), LIU Xueyan   

  1. School of Environmental Science & Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
  • Received:2017-07-19 Online:2018-02-10 Published:2018-01-11
  • Contact: HU Hui E-mail:huhhust@163.com

摘要:

以蓝藻为前驱体, 采用KOH活化法制备了一系列蓝藻基活性炭; 探讨了活化时间、 活化温度以及碱炭比等活化参数对其孔结构的影响; 进一步分别用HNO3, HPO4和NH3·H2O进行二次改性, 制备了N或P原子掺杂的改性蓝藻基活性炭, 研究了不同改性活性炭在25 ℃和1.01×105 Pa条件下对CO2的吸附捕集性能. 结果表明, KOH活化的最佳活化时间为2 h, 活化温度800 ℃, 碱炭比为2. 样品ACK-2-8在该条件下对CO2的吸附量达到3.85 mmol/g. 二次改性后的样品ACK-2-8-1, ACK-2-8-2和ACK-2-8-3对CO2的吸附量分别高达4.41, 3.97和4.63 mmol/g. N的掺杂有利于CO2的吸附捕集. 多批次重复再生实验结果表明, 本材料对CO2吸附再生具有较稳定的重复利用性.

关键词: 蓝藻基活性炭, KOH活化, CO2的吸附, N掺杂

Abstract:

A series of porous carbon sorbents obtained through carbonization and KOH activation of the abundant waste materials cyanobacteria or further modified by HNO3, HPO4or NH3·H2O was utilized for CO2 adsorption. During the optimal activation parameters experiments, the activation time, activation temperature and the KOH/C mass ratio were 2 h, 800 ℃ and 2, respectively. Sample ACK-2-8 was capable of uptake CO2 capacities near 3.85 mmol/g at 25 ℃ and 1.01×105 Pa. At the same time, the secondary modification samples of ACK-2-8-1, ACK-2-8-2 and ACK-2-8-3 exhibited CO2 uptake capacities up to 4.41, 3.97 and 4.63 mmol/g in turn. It was notable that the N-doping enhanced CO2 uptake from samples ACK-2-8-1 or ACK-2-8-3. It could be reused for five batches of continuous operation without a significant loss of CO2 uptake capacity and thus has a great potential of real-world applications.

Key words: Cyanobacteria-derived activated carbon, KOH activation, CO2 uptake, N-Doping

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