中国农业科技导报 ›› 2021, Vol. 23 ›› Issue (2): 150-158.DOI: 10.13304/j.nykjdb.2019.0719

• 生物制造 资源生态 • 上一篇    下一篇

温度对生物炭吸附重金属特性的影响研究

王鑫宇1,2,张曦2,孟海波2,沈玉君2,解恒燕1*,周海宾2,程红胜2,宋立秋2   

  1. 1.黑龙江八一农垦大学工程学院, 黑龙江 大庆 163319; 
    2.农业农村部规划设计研究院农村能源与环保研究所, 农业农村部资源循环利用技术与模式重点实验室, 北京 100125
  • 收稿日期:2019-09-02 出版日期:2021-02-15 发布日期:2019-10-22
  • 通讯作者: 解恒燕 E-mail: xiehy555@163.com
  • 作者简介:王鑫宇 E-mail:254684545@qq.com
  • 基金资助:
    国家重点研发计划项目（2016YFD0800603）；
    公益性行业（农业）科研专项（201503135）

Impact of Temperature on Adsorption Characteristics of Biochar on Heavy Metals

WANG Xinyu1,2, ZHANG Xi2, MENG Haibo2, SHEN Yujun2, XIE Hengyan1*, ZHOU Haibin2, CHENG Hongsheng2, SONG Liqiu2   

  1. 1.College of Engineering, Heilongjiang Bayi Agricultural University, Heilongjiang Daqing 163319, China;
    2.Key Laboratory of Technology and Model for Cyclic Utilization from Agricultural Resources, Ministry of Agriculture and Rural Affairs; Institute of Energy and Environmental Protection, Academy of Agricultural Planning and Engineering, Ministry of Agriculture and Rural Affairs, Beijing 100125, China
  • Received:2019-09-02 Online:2021-02-15 Published:2019-10-22

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摘要：

为探究温度条件对生物炭吸附重金属离子特性的影响，采用吸附试验研究25、45和65 ℃ 3种温度条件下生物炭对单一重金属离子溶液和多种重金属离子混合溶液的吸附能力变化。结果表明：生物炭对4种重金属的吸附均可采用Langmuir和Freundlich方程进行描述；温度是影响生物炭吸附重金属的重要因素，生物炭对Cu的吸附能力随温度的升高而减小，在25 ℃时吸附量最大，为5.27 mg·g-1，去除率达到36.17%；生物炭对Zn的吸附能力随温度的升高而增加，在65 ℃时吸附量最大，为4.94 mg·g-1，去除率达到45.36%；生物炭对Cd的吸附能力随温度的升高呈现先增加后降低的趋势，在45 ℃时吸附量最大，为5.82 mg·g-1，去除率达到53.85%；生物炭对Pb的吸附能力随温度的升高而增加，在65 ℃时吸附量最大，为21.35 mg·g-1，去除率达到98.61%。混合溶液中，生物炭对4种重金属的吸附强弱顺序为：Pb>Cu>Zn>Cd。温度升高能促进竞争吸附中生物炭对各重金属离子的吸附，对混合重金属离子的总吸附量也增大。

关键词: 温度, 重金属, 生物炭, 吸附性能, 竞争吸附

Abstract:

In order to explore the effect of temperature on adsorption ability of biochar on heavy metals, this paper conducted the equilibrium adsorption experiments of biochar on single and multiple heavy metals at 25, 45 and 65 ℃, respectively. The results indicated that: the adsorption characteristics of heavy metals (Cd, Pb, Cu, Zn) by biochar could be fitted by Langmuir and Freundlich equation. Temperature was an important factor affecting the adsorption of heavy metals by biochar. The adsorption capacities of biochar on Cu decreased with temperature increasing, the maximum adsorption capacity was 5.27 mg·g-1 at 25 ℃, and the removal rate reached 36.17%; the adsorption capacities of biochar on Zn increased with temperature increasing, and the maximum adsorption capacity was 4.94 mg·g-1 at 65 ℃, and the removal rate reached 45.36%; the adsorption capacity of biochar of on Cd increased first followed by a decline with temperature increasing, and the maximum adsorption capacity was 5.82 mg·g-1 at 45 ℃, and the removal rate reached 53.85%; the adsorption capacities of biochar on Pb were increased with temperature increasing, and the maximum adsorption capacity was 21.35 mg·g-1 at 65 ℃, and the removal rate was reached 98.61%. In
multiple heavy metals solution, the adsorption capacity of biochar was Pb>Cu>Zn>Cd. The adsorption of heavy metals were enhanced by the increase of the temperature, and the total adsorption amounts of biochar on heavy metals increased.

Key words: temperature, heavy metals, biochar, adsorption performance, competitive adsorption

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