Adsorption of Glyphosate by Soil and Biochar

WANG Lin; ZOU Ming; LIU Xiaodong; YU Yuanchun

doi:10.13870/j.cnki.stbcxb.2019.03.054

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Adsorption of Glyphosate by Soil and Biochar

更新时间：2025-03-12

- Adsorption of Glyphosate by Soil and Biochar
- Vol. 33, Issue 3, Pages: 372-377(2019)
- 作者机构：
  
  南京林业大学南方现代林业协同创新中心, 南京林业大学生物与环境学院,南京,210037
- 作者简介：
- 基金信息：
- DOI：10.13870/j.cnki.stbcxb.2019.03.054
  CLC：
- Published：2019
- 稿件说明：
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WANG Lin, ZOU Ming, LIU Xiaodong, et al. Adsorption of Glyphosate by Soil and Biochar[J]. 2019, 33(3): 372-377.
DOI：

WANG Lin, ZOU Ming, LIU Xiaodong, et al. Adsorption of Glyphosate by Soil and Biochar[J]. 2019, 33(3): 372-377. DOI： 10.13870/j.cnki.stbcxb.2019.03.054.

摘要

为了确定生物炭修复草甘膦污染土壤的可行性，通过添加不同比例和种类的生物炭到土壤中，研究土壤对草甘膦的吸附效果。采用吸附动力学拟合、等温吸附分析、红外光谱测定分析方法。结果表明：草甘膦能强烈地吸附在红壤及稻壳炭、竹炭、竹柳炭中，相比于红壤，3种生物炭达到吸附平衡时间短。吸附动力学符合准二级动力学方程，等温吸附符合Freundlich吸附等温方程。Freundlich吸附等温方程中1/n数值均<1，表明红壤和3种生物炭对草甘膦的吸附方式是非线性吸附，且非线性程度大小为竹柳炭 > 竹炭 > 红壤 > 稻壳炭。生物炭添加到红壤中，可以提高红壤吸附草甘膦的量，生物炭添加比例越高，土壤吸附草甘膦的量也越高。土壤中添加生物炭比例相同时，竹炭使土壤吸附草甘膦的量最高，竹柳炭次之、稻壳炭最低。3种生物炭吸附草甘膦前后的红外光谱分析阐明了酚、胺、芳香烃、羧酸、羧酸盐、脂肪醚等在吸附过程中起重要作用。

Abstract

In order to determine the feasibility of biochar to repair glyphosate-contaminated soil

the adsorption effect of soil on glyphosate was studied by adding different proportions and types of biochar to the soil. After adsorption kinetics fitting

isothermal adsorption analysis and infrared spectroscopy were used. The results showed that glyphosate was strongly adsorbed in soil

rice husk carbon

bamboo charcoal and bamboo fillet carbon. Compared with soil

the other three biochars had the shorter adsorption equilibrium time. Adsorption kinetics conformed to the quasi-second-order kinetic equation

and isothermal adsorption conformed to the Freundlich adsorption isotherm equation. In the Freundlich adsorption isotherm equation

all 1/n values were < 1

which showed that the adsorption of glyphosate by soil and three biochars was non-linear

and the degree of non-linearity was bamboo fillet carbon > bamboo charcoal > red soil > rice husk carbon. Adding biochar to red soil could increase the adsorption of glyphosate in red soil. The higher the ratio of biochar addition

the higher the amount of glyphosate adsorbed by the soil. When the proportions of biochar added in soil were the same

bamboo charcoal was added to red soil to make the highest amount of glyphosate adsorbed on soil

followed by bamboo charcoal

and rice husk charcoal. The infrared spectra before and after the adsorption of glyphosate by three biochars demonstrated that phenol

amine

aromatic hydrocarbon

carboxylic acid

carboxylate and adipoether played the important role in the adsorption process.

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