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马铃薯秸秆生物炭对黄土吸附Cd(Ⅱ)的影响

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王璐, 赵保卫, 马锋锋, 许仁智, 李烨炜. 马铃薯秸秆生物炭对黄土吸附Cd(Ⅱ)的影响[J]. 环境化学, 2016, 35(7): 1422-1430. doi: 10.7524/j.issn.0254-6108.2016.07.2015121103
引用本文: 王璐, 赵保卫, 马锋锋, 许仁智, 李烨炜. 马铃薯秸秆生物炭对黄土吸附Cd(Ⅱ)的影响[J]. 环境化学, 2016, 35(7): 1422-1430. doi: 10.7524/j.issn.0254-6108.2016.07.2015121103
shu
WANG Lu, ZHAO Baowei, MA Fengfeng, XU Renzhi, LI Yewei. Effects of biochar derived from potato straw on adsorption of Cd(Ⅱ) onto loess[J]. Environmental Chemistry, 2016, 35(7): 1422-1430. doi: 10.7524/j.issn.0254-6108.2016.07.2015121103
Citation: WANG Lu, ZHAO Baowei, MA Fengfeng, XU Renzhi, LI Yewei. Effects of biochar derived from potato straw on adsorption of Cd(Ⅱ) onto loess[J]. Environmental Chemistry, 2016, 35(7): 1422-1430. doi: 10.7524/j.issn.0254-6108.2016.07.2015121103
shu

马铃薯秸秆生物炭对黄土吸附Cd(Ⅱ)的影响

  • 1.

    兰州交通大学环境与市政工程学院, 兰州, 730070

  • 基金项目:

    国家自然科学基金（21167007，41261077），高等学校博士学科点专项科研基金（20136204110003），兰州交通大学青年科学基金（2013015）资助.

Effects of biochar derived from potato straw on adsorption of Cd(Ⅱ) onto loess

  • 1.

    School of Environmental and Municipal Engineering, Lanzhou Jiaotong University, Lanzhou, 730070, China

  • Fund Project: Supported by the National Natural Science Foundation of China(21167007, 41261077)and the Specialized Research Fund for the Doctoral Program of Higher Education of China(20136204110003)and the Youth Scientific Funds of Lanzhou Jiaotong University(2013015).

  • 摘要: 为了探究来源于本地农业废弃物的生物炭对区域重金属污染黄土吸附固定化修复的可行性，本文采用批量平衡实验法，研究了马铃薯秸秆生物炭、黄土和生物炭与黄土混合物（加炭黄土）吸附重金属Cd（Ⅱ）的性能，考察了吸附时间、初始Cd（Ⅱ）浓度和溶液pH值对吸附过程的影响，并利用红外光谱、X-射线衍射分析等方法对吸附前后的生物炭和黄土分别进行表征.结果表明，生物炭、黄土、加炭黄土对Cd（Ⅱ）的吸附等温模式符合Langmuir模型，在25℃下的最大吸附量分别为15.60、7.87、12.40 mg·g-1，吸附动力学数据满足准二级动力学方程，溶液初始pH值对Cd（Ⅱ）的吸附过程影响较大，2 < pH < 4和6 < pH < 8时，吸附量增加速率很快，而4 < pH < 6时，吸附量平缓上升.表征结果说明离子交换和阳离子-π作用为生物炭对Cd（Ⅱ）的主要吸附机制，而黄土对Cd（Ⅱ）的吸附主要归因于石英、高岭石等黏土矿物以及有机质中的羧基基团.对比动力学和等温吸附数据可得，在实验研究范围内，生物炭的添加使黄土对Cd（Ⅱ）的吸附能力分别提高了41.50%和49.94%.因此，在一定条件下，生物炭的输入可有效提高黄土对Cd（Ⅱ）的吸附固定化能力.
    Abstract: In order to investigate the feasibility of adsorption-immobilization remediation for heavy metal-contaminated loess soils using biochars originated from the local agricultural wastes, the adsorption of Cd(Ⅱ) onto the biochar derived from potato straw, loess and loess with the biochar was investigated. The biochar and loess before and after adsorption were characterized by X-ray diffraction(XRD) and FTIR spectra. The influences of contact time, pH value of solution and initial Cd(Ⅱ) concentration on the adsorption were studied by batch adsorption experiment. The results indicated that the adsorption isotherms for all three adsorbents were well fitted with Langmuir model and the maximum adsorption capacities were 15.60, 7.87, 12.40 mg·g-1 at 25℃, respectively. The adsorption kinetics were well described by pseudo-second kinetic model. The solution pH exhibited a significant impact on adsorption. The adsorption capacity increased rapidly when the pH increased from 2 to 4 and from 6 to 8. When the pH values increosed from 4 to 6, the adsorption capacity increased gradually. The characterization results indicated that ion exchange and cation-π interaction were the main adsorption mechanisms of Cd(Ⅱ) onto biochar. The adsorption of Cd(Ⅱ) onto loess could be attributed to the clay minerals including quartz, kaolinite and the carboxyl groups in organic matter. According to the data from kinetics and isotherms, the adsorption capacity of Cd(Ⅱ) onto loess increased by 41.50% and 49.94% respectively when the loess was mixed with biochar within the experimental study, which showed that the amendment of biochar could effectively improve the adsorption capacity of loess to Cd(Ⅱ) under above conditions.
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  • 收稿日期:  2015-12-11
  • 刊出日期:  2016-07-15
王璐, 赵保卫, 马锋锋, 许仁智, 李烨炜. 马铃薯秸秆生物炭对黄土吸附Cd(Ⅱ)的影响[J]. 环境化学, 2016, 35(7): 1422-1430. doi: 10.7524/j.issn.0254-6108.2016.07.2015121103
引用本文: 王璐, 赵保卫, 马锋锋, 许仁智, 李烨炜. 马铃薯秸秆生物炭对黄土吸附Cd(Ⅱ)的影响[J]. 环境化学, 2016, 35(7): 1422-1430. doi: 10.7524/j.issn.0254-6108.2016.07.2015121103
shu
WANG Lu, ZHAO Baowei, MA Fengfeng, XU Renzhi, LI Yewei. Effects of biochar derived from potato straw on adsorption of Cd(Ⅱ) onto loess[J]. Environmental Chemistry, 2016, 35(7): 1422-1430. doi: 10.7524/j.issn.0254-6108.2016.07.2015121103
Citation: WANG Lu, ZHAO Baowei, MA Fengfeng, XU Renzhi, LI Yewei. Effects of biochar derived from potato straw on adsorption of Cd(Ⅱ) onto loess[J]. Environmental Chemistry, 2016, 35(7): 1422-1430. doi: 10.7524/j.issn.0254-6108.2016.07.2015121103
shu

马铃薯秸秆生物炭对黄土吸附Cd(Ⅱ)的影响

  • 1. 兰州交通大学环境与市政工程学院, 兰州, 730070
  • 收稿日期:  2015-12-11
基金项目:

国家自然科学基金（21167007，41261077），高等学校博士学科点专项科研基金（20136204110003），兰州交通大学青年科学基金（2013015）资助.

摘要: 为了探究来源于本地农业废弃物的生物炭对区域重金属污染黄土吸附固定化修复的可行性，本文采用批量平衡实验法，研究了马铃薯秸秆生物炭、黄土和生物炭与黄土混合物（加炭黄土）吸附重金属Cd（Ⅱ）的性能，考察了吸附时间、初始Cd（Ⅱ）浓度和溶液pH值对吸附过程的影响，并利用红外光谱、X-射线衍射分析等方法对吸附前后的生物炭和黄土分别进行表征.结果表明，生物炭、黄土、加炭黄土对Cd（Ⅱ）的吸附等温模式符合Langmuir模型，在25℃下的最大吸附量分别为15.60、7.87、12.40 mg·g-1，吸附动力学数据满足准二级动力学方程，溶液初始pH值对Cd（Ⅱ）的吸附过程影响较大，2 < pH < 4和6 < pH < 8时，吸附量增加速率很快，而4 < pH < 6时，吸附量平缓上升.表征结果说明离子交换和阳离子-π作用为生物炭对Cd（Ⅱ）的主要吸附机制，而黄土对Cd（Ⅱ）的吸附主要归因于石英、高岭石等黏土矿物以及有机质中的羧基基团.对比动力学和等温吸附数据可得，在实验研究范围内，生物炭的添加使黄土对Cd（Ⅱ）的吸附能力分别提高了41.50%和49.94%.因此，在一定条件下，生物炭的输入可有效提高黄土对Cd（Ⅱ）的吸附固定化能力.

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