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运用Boyd液膜扩散公式和范山鹰等提出的扩散模型,考察了碱性溶液中铜、锌氰配合物在离子交换纤维上的扩散行为;通过分析吸附前后纤维上官能团的位置变化以及解吸前后纤维上元素含量的变化,研究铜、锌氰配合物在纤维上的吸附机理。实验结果表明,离子交换纤维对铜、锌配合物的吸附在反应初期,以液膜扩散为主控制步骤,反应后期,以空隙扩散为主控制步骤。并运用离子交换纤维在水溶液中具有类似胶体型物质的双电层结构解释了不同控制阶段吸附速率不同的原因,虽然各阶段吸附速率有所不同,但纤维对铜、锌氰配合物的吸附均为离子交换机制。
The diffusion behavior of copper and zinc cyanide complexes in ion exchange fibers in alkaline solution was investigated by using the diffusion model proposed by Boyd liquid membrane and the diffusion model proposed by Fan Shanying. By analyzing the changes of the functional groups on the fibers before and after adsorption and on the fibers before and after desorption Elemental content of copper, zinc cyanide complexes on the adsorption mechanism of the fiber. The experimental results show that the adsorption of Cu and Zn complexes by ion exchange fiber is mainly controlled by the liquid film diffusion at the initial reaction stage, and the interspace diffusion is the main control step at the later stage of reaction. The reason of different adsorption rates in different control stages was explained by using the electric double layer structure of ion exchange fiber with colloid-like substance in aqueous solution. Although the adsorption rates were different in each stage, the adsorption of copper and zinc cyanide For ion exchange mechanism.