Effects of Biochar Amendment on Adsorption and Desorption Characteristics of Cd<sup>2+</sup> in Red Paddy Soil

doi:10.13870/j.cnki.stbcxb.2020.02.051

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Effects of Biochar Amendment on Adsorption and Desorption Characteristics of Cd²⁺ in Red Paddy Soil

更新时间：2025-03-12

- Effects of Biochar Amendment on Adsorption and Desorption Characteristics of Cd²⁺ in Red Paddy Soil
- Vol. 34, Issue 2, Pages: 360-364(2020)
- 作者机构：
  
  南京农业大学资源与环境科学学院,南京,210095
- 作者简介：
- 基金信息：
- DOI：10.13870/j.cnki.stbcxb.2020.02.051
  CLC：
- Published：2020
- 稿件说明：
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Effects of Biochar Amendment on Adsorption and Desorption Characteristics of Cd²⁺ in Red Paddy Soil[J]. 2020, 34(2): 360-364.
DOI：

Effects of Biochar Amendment on Adsorption and Desorption Characteristics of Cd²⁺ in Red Paddy Soil[J]. 2020, 34(2): 360-364. DOI： 10.13870/j.cnki.stbcxb.2020.02.051.

摘要

为探讨生物质炭对红壤性水稻土中镉（Cd）元素吸附解吸特性的影响，采用一次平衡法研究添加生物质炭后Cd

在红壤性水稻土中的吸附动力学、等温吸附和解吸过程。结果表明：施用CK （0 t/hm

）、A10（10 t/hm

）、A20（20 t/hm

）、A30（30 t/hm

）和A40（40 t/hm

）生物质炭后，红壤性水稻土对Cd

的吸附过程是以化学吸附为主、非均匀的多表面吸附。施用CK （0 t/hm

）、A10（10 t/h

）、A20（20 t/hm

）、A30（30 t/hm

）和A40（40 t/hm

）生物质炭处理的最大吸附量和最大解吸量分别为2 933~3 346 mg/kg和171~192 mg/kg。添加生物质炭可以提高红壤性水稻土对Cd

的吸附固持能力，同时增强土壤对外源Cd

的缓冲能力。生物质炭添加量对红壤性水稻土的吸附解吸能力的改良效果具体表现为：A30

A40

A20

A10。高剂量的生物质炭处理使土壤吸附点位饱和，生物质炭吸附能力相对降低。因此，添加30 t/hm

生物质炭是一种有效预防和治理红壤性水稻土镉污染的措施。

Abstract

In order to investigate the effects of biochar on the adsorption and desorption characteristics of cadmium (Cd) elements

the adsorption kinetics

isothermal adsorption and desorption of Cd

in red soil paddy soils amended with biochar were studied by a primary equilibrium method. The results showed that after applying biochar of CK (0 t/hm

)

A10 (10 t/hm

)

A20 (20 t/hm

)

A30 (30 t/hm

) and A40 (40 t/hm

)

the adsorption of Cd

in red paddy

soil was dominated by chemical adsorption and heterogeneous multi-surface adsorption. The maximum contents of adsorption and desorption of each treatment were between 2 933~3 346 mg/kg and 171~192 mg/kg

respectively. The biochar enhanced the adsorption and fixation capacity for Cd

in red paddy soil and improved the buffer capacity for Cd

. The improvement of adsorption and desorption capacity in red paddy soil amended with biochar was shown as follows:A30

A40

A20

A10. High addition of biochar could saturate the soil adsorption point. Therefore

the adsorption capacity of biochar was relatively low. In conclusion

addition of 30 t/hm

biochar was the most reasonable measure.

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⁰

Effects of Biochar Amendment on Adsorption and Desorption Characteristics of Cd2+ in Red Paddy Soil

DOI：10.13870/j.cnki.stbcxb.2020.02.051

摘要

Abstract

关键词

Keywords

references

Effects of Biochar Amendment on Adsorption and Desorption Characteristics of Cd²⁺ in Red Paddy Soil