【摘要】 采用铁基非晶合金粉末Fe₇₈Si₉B₁₃固定化修复Cu污染土壤，探讨不同温度和pH值对Cu²⁺形态转变的影响。动力学分析结果表明，Fe₇₈Si₉B₁₃^AP与Cu²⁺的反应均符合准一级动力学方程描述的规律，土壤总Cu含量为600 mg/kg,温度为313 K,pH=6时，Fe₇₈Si₉B₁₃^AP化学反应速率k_obs=1.449 h^-1,活化能ΔE=15.94 kJ/mol。修复后土壤的三步浸提（BCR）结果显示，土壤中迁移态的Cu转变为可还原态和可氧化态，从而有效降低了土壤的环境风险。研究反应机理发现，Fe₇₈Si₉B₁₃^AP的开路电压比零价Fe（ZVI）低0.27 V,因此在与Cu²⁺的反应中具有更高的还原性。Fe₇₈Si₉B₁₃^AP的产物层中存在大量疏松的孔道结构，有利于Cu²⁺向反应界面的扩散从而保证反应的持续发生。更多还原

【Abstract】 Fe-based amorphous alloy powders(Fe₇₈Si₉B₁₃^AP) were adopted to immobilize and remediate copper-contaminated soil, and effects of temperatures and pH on morphological transformation of Cu²⁺ were investigated. The kinetic results indicate that the reaction of Fe₇₈Si₉B₁₃^AP and Cu²⁺are consistent with the description of quasi-first-order dynamic equation. With the content of total copper in soil of 600 mg/kg, the temperature of 313 K and pH=6, the chemical reaction rate k_obs of Fe₇₈Si₉B₁₃^AP is 1.449 h^-1, and the activation energy ΔE is 15.94 kJ/mol. The three-step leaching（BCR） results of soil after remediation reveal that the migratory copper in the soil is transformed into reducible and oxidizable states, thus effectively reducing the environmental risk of the soil. Reaction mechanism demonstrates that the open-circuit voltage of Fe₇₈Si₉B₁₃^AP is 0.27 V lower than ZVI, which exhibits higher reducibility in the reaction with Cu²⁺. There exists a large number of loose pore structures in the product layer of Fe₇₈Si₉B₁₃^AP, which is conducive to the diffusion of Cu²⁺ to the reaction interface, ensuring the continuous occurrence of the reaction.更多还原