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纳米零价铁改性氨基生物炭的制备及对Cd (Ⅱ)的吸附和解吸特性

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马天行, 杨琛, 江鲜英, 党志, 李筱琴. 纳米零价铁改性氨基生物炭的制备及对Cd (Ⅱ)的吸附和解吸特性[J]. 环境工程学报, 2016, 10(10): 5433-5439. doi: 10.12030/j.cjee.201603178
引用本文: 马天行, 杨琛, 江鲜英, 党志, 李筱琴. 纳米零价铁改性氨基生物炭的制备及对Cd (Ⅱ)的吸附和解吸特性[J]. 环境工程学报, 2016, 10(10): 5433-5439. doi: 10.12030/j.cjee.201603178
shu
MA Tianxing, YANG Chen, JIANG Xianying, DANG Zhi, LI Xiaoqin. Adsorption and desorption of Cd(Ⅱ) on amino biochar modified by nano zero valent iron[J]. Chinese Journal of Environmental Engineering, 2016, 10(10): 5433-5439. doi: 10.12030/j.cjee.201603178
Citation: MA Tianxing, YANG Chen, JIANG Xianying, DANG Zhi, LI Xiaoqin. Adsorption and desorption of Cd(Ⅱ) on amino biochar modified by nano zero valent iron[J]. Chinese Journal of Environmental Engineering, 2016, 10(10): 5433-5439. doi: 10.12030/j.cjee.201603178
shu

纳米零价铁改性氨基生物炭的制备及对Cd (Ⅱ)的吸附和解吸特性

  • 1.

    华南理工大学环境与能源学院, 广州 510006

  • 2.

    工业聚集区污染控制与生态修复教育部重点实验室, 广州 510006

  • 3.

    固体废物处理与资源化广东省环境保护重点实验室, 广州 510006

  • 基金项目:

    国家高技术研究发展计划（863）项目（2013AA06A209）

  • 中图分类号: X703

Adsorption and desorption of Cd(Ⅱ) on amino biochar modified by nano zero valent iron

  • 1.

    School of Environment and Energy, South China University of Technology, Guangzhou 510006, China

  • 2.

    Key Laboratory of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, Guangzhou 510006, China

  • 3.

    Guangdong Environmental Protection Key Laboratory of Solid Waste Treatment and Recycling, Guangzhou 510006, China

  • Fund Project:

摘要

  • 摘要: 通过化学负载方法成功制得纳米零价铁改性氨基生物炭复合材料（ABC/NZVI），对其进行表征和研究了其对重金属Cd（Ⅱ）的吸附和解吸特性。结果表明，改性后，ABC/NZVI具有氨基官能团并且表面负载了纳米零价铁，比表面积为244 m2·g-1，在水溶液中稳定悬浮的平均粒径是845 nm。ABC/NZVI对Cd（Ⅱ）的吸附大约在457 min内即可达到吸附平衡，吸附动力学可用伪二级动力学模型较好地拟合（R2≥0.990）；对Cd（Ⅱ）表现出优良的吸附性能，饱和吸附容量为12.4 mg·g-1，吸附/解吸等温线均呈现出明显的非线性，可用Langmuir模型较好地拟合（R2≥0.960），而且出现明显的解吸滞后现象，滞后系数（HI）为0.536。因此，ABC/NZVI对Cd（Ⅱ）的吸附可能为单分子层的化学吸附，主要的吸附机理可能涉及配合和沉淀两种作用。
    Abstract: Amino biochar modified by nano zero-valent iron (ABC/NZVI) was prepared using chemical-modification methods.The characterization results revealed that the amino groups formed chemical bonds with the nano zero-valent iron (NZVI),which was successfully loaded onto the surface of the materials.The specific surface area of ABC/NZVI was about 244 m2·g-1,and the average particle size that could be stably suspended in aqueous solution was 845 nm.The results of adsorption kinetic experiments revealed that the adsorption achieved equilibrium within 457 min,and the data conformed with a pseudo-second order model.The adsorption/desorption was obviously non-linear,the experimental data obtained at 298 K was better fitted with the Langmuir isotherm (R2≥0.960),and the calculated maximum adsorption capacity of Cd(Ⅱ) was 12.4 mg·g-1.Significant desorption hysteresis (HI=0.536) was also observed.The adsorption of Cd(Ⅱ) on ABC/NZVI might be monolayer chemisorption,and the adsorption process might be related with complexation and precipitation.
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  • 收稿日期:  2016-04-22
  • 刊出日期:  2016-10-20
马天行, 杨琛, 江鲜英, 党志, 李筱琴. 纳米零价铁改性氨基生物炭的制备及对Cd (Ⅱ)的吸附和解吸特性[J]. 环境工程学报, 2016, 10(10): 5433-5439. doi: 10.12030/j.cjee.201603178
引用本文: 马天行, 杨琛, 江鲜英, 党志, 李筱琴. 纳米零价铁改性氨基生物炭的制备及对Cd (Ⅱ)的吸附和解吸特性[J]. 环境工程学报, 2016, 10(10): 5433-5439. doi: 10.12030/j.cjee.201603178
shu
MA Tianxing, YANG Chen, JIANG Xianying, DANG Zhi, LI Xiaoqin. Adsorption and desorption of Cd(Ⅱ) on amino biochar modified by nano zero valent iron[J]. Chinese Journal of Environmental Engineering, 2016, 10(10): 5433-5439. doi: 10.12030/j.cjee.201603178
Citation: MA Tianxing, YANG Chen, JIANG Xianying, DANG Zhi, LI Xiaoqin. Adsorption and desorption of Cd(Ⅱ) on amino biochar modified by nano zero valent iron[J]. Chinese Journal of Environmental Engineering, 2016, 10(10): 5433-5439. doi: 10.12030/j.cjee.201603178
shu

纳米零价铁改性氨基生物炭的制备及对Cd (Ⅱ)的吸附和解吸特性

  • 1.  华南理工大学环境与能源学院, 广州 510006
  • 2.  工业聚集区污染控制与生态修复教育部重点实验室, 广州 510006
  • 3.  固体废物处理与资源化广东省环境保护重点实验室, 广州 510006
  • 收稿日期:  2016-04-22
基金项目:

国家高技术研究发展计划（863）项目（2013AA06A209）

摘要: 通过化学负载方法成功制得纳米零价铁改性氨基生物炭复合材料（ABC/NZVI），对其进行表征和研究了其对重金属Cd（Ⅱ）的吸附和解吸特性。结果表明，改性后，ABC/NZVI具有氨基官能团并且表面负载了纳米零价铁，比表面积为244 m2·g-1，在水溶液中稳定悬浮的平均粒径是845 nm。ABC/NZVI对Cd（Ⅱ）的吸附大约在457 min内即可达到吸附平衡，吸附动力学可用伪二级动力学模型较好地拟合（R2≥0.990）；对Cd（Ⅱ）表现出优良的吸附性能，饱和吸附容量为12.4 mg·g-1，吸附/解吸等温线均呈现出明显的非线性，可用Langmuir模型较好地拟合（R2≥0.960），而且出现明显的解吸滞后现象，滞后系数（HI）为0.536。因此，ABC/NZVI对Cd（Ⅱ）的吸附可能为单分子层的化学吸附，主要的吸附机理可能涉及配合和沉淀两种作用。

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