Effects of Cotton and Peanut Straw Biochar on Cu(Ⅱ) Migration in Brown Soil

JING Yande; GONG Chen; SUN Xiaoyin; WANG Shiliang; JU Wenliang

doi:10.13961/j.cnki.stbctb.2016.03.010

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Effects of Cotton and Peanut Straw Biochar on Cu(Ⅱ) Migration in Brown Soil

- Effects of Cotton and Peanut Straw Biochar on Cu(Ⅱ) Migration in Brown Soil
- Bulletin of Soiland Water Conservation Vol. 36, Issue 3, Pages: 50-55(2016)
- 作者机构：
  
  1. 山东省高校南四湖湿地生态与环境保护重点实验室,山东,济宁,273165
  2. 曲阜师范大学地理与旅游学院,山东,日照,276826
- 作者简介：
- 基金信息：
- DOI：10.13961/j.cnki.stbctb.2016.03.010
  CLC：
- Published：2016
- 稿件说明：
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JING Yande, GONG Chen, SUN Xiaoyin, et al. Effects of Cotton and Peanut Straw Biochar on Cu(Ⅱ) Migration in Brown Soil[J]. Bulletin of Soiland Water Conservation, 2016, 36(3): 50-55.
DOI：

JING Yande, GONG Chen, SUN Xiaoyin, et al. Effects of Cotton and Peanut Straw Biochar on Cu(Ⅱ) Migration in Brown Soil[J]. Bulletin of Soiland Water Conservation, 2016, 36(3): 50-55. DOI： 10.13961/j.cnki.stbctb.2016.03.010.

摘要

［目的］分析棉花、花生生物炭基本理化性质，模拟自然条件下降雨对土壤中Cu（Ⅱ）淋失量的影响，探讨生物炭修复Cu（Ⅱ）污染棕壤的可行性。［方法］以棉花、花生秸秆为原料，采用限氧热解法分别在350，500，650℃下制备生物炭，将生物炭按1%的炭土干重比施入铜污染棕壤［Cu（Ⅱ）的浓度200 mg/kg］，通过室内土柱淋溶试验分析添加不同生物炭对土壤缓冲性能和吸附能力的影响。［结果］两类生物炭的H/C及O/C的比值随着温度的升高逐渐降低，而生物炭的BET比表面积则随着制备温度的升高而逐渐增大；添加生物炭的土壤淋溶液pH值显著高于空白处理，花生生物炭的效果更为显著；随着淋溶次数的增加，添加生物炭的土壤中Cu（Ⅱ）的淋失量明显低于空白处理；添加花生生物炭提高了土壤中Cu（Ⅱ）的专性吸附，以650℃最为显著。［结论］两种生物炭能明显提高土壤的缓冲性能和对重金属的吸持能力，其中以花生生物炭的效果更为明显。

Abstract

[Objective] To analyze the physicochemical properties of the cotton and peanut biochar

and investigate the effects of rainfall on Cu(Ⅱ) leaching quantity under simulated rainfall in natural conditions in order to assess the feasibility of using straw biochars to remediate the Cu(Ⅱ) contaminated soil.[Methods] Cotton and peanut straw was selected as raw materials to produce biochar by using limited oxygen pyrolysis method under 350

500 and 650℃ conditions. A laboratory simulation test was used to analyze the effects of different biochar amendment on soil buffering capability and the retention capacity of heavy metals. Biochar with 1% carbon/soil dry weight ratio were supplied in Cu(Ⅱ) (200 mg/kg) contaminated brown soil.[Results] The ratio of O/C and H/C in two different kinds of biochar were decreased gradually with the increase of temperature

while the BET surface area of biochar was decreased with the increase of temperature. The pH value of soil leaching solution in biochar added soil was significantly higher than that of the control treatment

and the effect of peanut biochar was more significant. With the increase of leaching times

Cu(Ⅱ) leaching amount in biochar added soil was significantly lower than that in the control treatment. The peanut biochar addition could increase the specific adsorptions of Cu(Ⅱ) in soil

especially at 650℃ condition.[Conclusion] Both of the two straw biochar addition significantly improve the soil buffering capability and the retention capacity of heavy metals in soil

in which the effect of peanut biochar is more obvious.

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