| Effect of Crop-Straw Derived Biochars on Pb(Ⅱ) Adsorption in Two Variable Charge Soils |
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| 作者姓名： | JIANG Tian-yu XU Ren-kou GU Tian-xia JIANG Jun |
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| 作者单位： | [1]State Key Laboratory of Soil and Sustainable Agriculture/Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, P.R. China [2]College of Resource and Environment, Nanjing Agriculture University, Nanjing 210095, P.R.China [3]Wuhan Environmental Monitoring Center, Wuhan Environmental Protection Bureau, Wuhan 430015, P.R.China [4]Nanjing Foreign Language School, Nanjing 210008, P.R.China |
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| 基金项目： | This study was supported by the Key Technoligies R＆D Program of China during the 12th Five-Year Plan period （2012BAJ24B06） and the National Natural Science Foundation of China （41230855）. |
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| 摘 要： | Two variable charge soils were incubated with biochars derived from straws of peanut, soybean, canola, and rice to investigate the effect of the biochars on their chemical properties and Pb（II） adsorption using batch experiments. The results showed soil cation exchange capacity （CEC） and pH significantly increased after 30 d of incubation with the biochars added. The incorporation of the biochars markedly increased the adsorption of Pb（II）, and both the electrostatic and non-electrostatic adsorption mechanisms contributed to Pb（II） adsorption by the variable charge soils. Adsorption isotherms illustrated legume- straw derived biochars more greatly increased Pb（II） adsorption on soils through the non-electrostatic mechanism via the formation of surface complexes between Pb（II） and acid functional groups of the biochars than did non-legume straw biochars. The adsorption capacity of Pb（II） increased, while the desorption amount slightly decreased with the increasing suspension pH for the studied soils, especially in a high suspension pH, indicating that precipitation also plays an important role in immobilizing Pb（II） to the soils.
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| 关 键 词： | 可变电荷土壤 吸附效果 作物秸秆 Pb 衍生 阳离子交换容量 铅（Ⅱ） 吸附机制 |
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