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研究论文

Effect of corn cob biochar on the adsorption of 2,4-Dichlorophenoxyacetic acid in spiked soil

应博
1. 沈阳农业大学土地与环境学院, 土肥资源高效利用国家工程实验室, 辽宁省农业资源与环境重点实验室, 沈阳 110866;2. 辽宁省环境监测实验中心, 沈阳 110161

赵玉婷
1. 沈阳农业大学土地与环境学院, 土肥资源高效利用国家工程实验室, 辽宁省农业资源与环境重点实验室, 沈阳 110866;2. 辽宁省生物炭工程技术研究中心, 沈阳 110866

王建国
1. 沈阳农业大学土地与环境学院, 土肥资源高效利用国家工程实验室, 辽宁省农业资源与环境重点实验室, 沈阳 110866;2. 辽宁省生物炭工程技术研究中心, 沈阳 110866

摘要：研究了玉米芯生物炭剂对土壤中2,4-D的吸附性能,并探讨了影响吸附的因素和吸附机理.结果表明:生物炭可使土壤对2,4-D的吸附容量显著增大.吸附结果用Freundlich和Redlich-Peterson方程都可以较好地拟合(R² >0.95).60 h后,与对照土壤相比,添加质量分数为0.5%生物炭的土壤对2,4-D的最大吸附量从20.83 μg · g^-1升高到58.82 μg · g^-1.吸附动力学研究表明,伪二级动力学速率方程对土壤吸附2,4-D的过程拟合效果较好(R²> 0.99),优于一级动力学速率模型;pH和温度对土壤中2,4-D的吸附影响显著,pH接近3.1和40 ℃的水浴环境更利于添加生物炭的土壤对2,4-D的吸附.玉米芯生物炭可作为原位修复剂吸附土壤中的2,4-D,从而降低土壤中有机污染物的迁移性和生物有效性.

Abstract：This work investigates the adsorption of 2,4-Dichlorophenoxyacetic (2,4-D) in spiked soil with biochar derived from maize straw. The adsorption capacity of soil was enhanced by biochar application. According to equation linear fitting of Langmuir, Freundlich and Redlich-Peterson isotherms, when biochar weight was 0.5%, the theoretical uptake of 2,4-D reached 58.82 μg · g^-1 (initial 2,4-D concentration of 10 mg · L^-1) within 60 h. High correlation coefficients (R² >0.99) suggest that pseudo-second order kinetic model appropriately described the adsorption of 2,4-D onto biochar-added soil. Further analysis indicated that 2,4-D adsorption in soil is positively influenced by reaction condition such as pH value and temperature. A pH value of 3.1 and temperature of 40 ℃ suitably ensured the adsorption capacity of biochar-added soil. Results from this study suggest that biochar effectively remediates 2,4-D-contaminated soil in situ.