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磁场作用对磁性活性炭吸附性能的影响规律
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Abstract:
为了研究磁场作用对磁性吸附剂吸附性能的影响规律，实验合成了磁性活性炭Fe3O4@AC，并研究其在磁场作用下对亚甲基蓝染料(MB)的吸附行为。结果表明，在磁场作用下Fe3O4@AC对MB的吸附效率较无磁场作用下显著提高，但比吸附容量提升不明显。磁场的磁场强度显著影响Fe3O4@AC的吸附性能，Fe3O4@AC的吸附容量随着磁场强度增加先增加后减小，当磁场强度为50 mT时，比吸附容量最高，达162.3 mg/g，较无磁场时提高7.2%，但其到达吸附平衡时间减少了40%左右。同时，磁场作用可显著提升Fe3O4@AC对MB的吸附选择性。磁场下的吸附过程受初始pH值、MB初始浓度等因素的影响有限。通过等温吸附模型、吸附动力学、颗粒扩散模型理论拟合，发现Fe3O4@AC对MB的吸附以化学吸附为主，符合准二级动力学方程。磁场作用未对吸附动力过程产生显著影响，但可促进颗粒扩散模型中的内扩散过程。
In order to investigate the influence law of magnetic field action on the adsorption performance of magnetic adsorbents, magnetic activated carbon Fe3O4@AC was experimentally synthesized and its adsorption behavior on methylene blue dye (MB) under magnetic field action was investigated. The results showed that the adsorption efficiency of Fe3O4@AC on MB under the action of magnetic field was significantly improved compared with that without magnetic field, but the enhancement of specific adsorption capacity was not obvious. The magnetic field strength of the magnetic field significantly affected the adsorption performance of Fe3O4@AC, and the adsorption capacity of Fe3O4@AC increased and then decreased with the increase of the magnetic field strength, and the specific adsorption capacity was the highest when the magnetic field strength was 50 mT, which was 162.3 mg/g, and increased by 7.2% compared with that in the absence of the magnetic field, but the time for it to reach the adsorption equilibrium was reduced by about 40%. Meanwhile, the magnetic field effect can significantly enhance the adsorption selectivity of Fe3O4@AC on MB. The adsorption process under the magnetic field was limitedly influenced by factors such as initial pH and MB initial concentration. Theoretical fitting by isothermal adsorption model, adsorption kinetics, and particle diffusion model revealed that the adsorption of Fe3O4@AC on MB was dominated by chemisorption, which was consistent with the quasi-secondary kinetic equation. The magnetic field effect did not significantly affect the adsorption kinetic process, but could promote the internal diffusion process in the particle diffusion model.
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