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首页> 外文期刊>Journal of Materials Science >The influence of ZSM-5 structure on As(V) adsorption performance: pseudomorphic transformation and grafting of rare-earth Ce onto ZSM-5
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The influence of ZSM-5 structure on As(V) adsorption performance: pseudomorphic transformation and grafting of rare-earth Ce onto ZSM-5

机译：ZSM-5结构对（v）吸附性能的影响：假形态转化和稀土ce嫁接到ZSM-5

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摘要

ZSM-5 has been regarded as one of the potential materials for separating substances from the mixture; however, their micropore channel is not favorable to load new active sites and adsorbate species. Herein, the pseudomorphic transformation method was used to convert high-aluminum-content micropore ZSM-5 into mesoporous structure (ZSM-5K). The samples of ZSM-5 and ZSM-5K were modified by Ce-2(SO4)(3) via the same impregnation route, and the obtained samples were used to adsorb As(V) from aqueous solution. The As(V) removal percentage and the X-ray diffraction data indicate that Ce-2(SO4)(3) was the effective adsorption site due to the high affinity between As(V) species and Ce. The N-2 adsorption-desorption isotherms show that the linear connection between As(V) removal and BET surface of adsorbents was been obtained. The transmission electron microscopy results showed that mesoporous structure was more favorable to disperse the adsorption sites. In addition, the As(V) equilibrium adsorption data were fitted well by the Langmuir isotherm, and the maximum adsorption capacity was found as 31.63 mg/g, which was larger than that of the conventional alumina, carbon, iron oxide, etc. The adsorption kinetics under different initial concentration obeyed the pseudo-second-order model.
机译：ZSM-5已被认为是用于将物质与混合物分离的潜在材料之一;然而，它们的微孔通道不利地负载新的活性位点和吸附物种。在此，使用假形晶体转化方法将高铝含量微孔ZSM-5转化为中孔结构（ZSM-5K）。通过CE-2（SO 4）（3）通过相同的浸渍途径修饰ZSM-5和ZSM-5K的样品，并使用得到的样品吸附来自水溶液的（V）。 AS（v）去除率和X射线衍射数据表明CE-2（SO4）（3）是由于（v）种和Ce之间的高亲和力导致的有效吸附位点。 N-2吸附 - 解吸等温物表明，得到（v）去除和吸附剂的BES表面之间的线性连接。透射电子显微镜结果表明，中孔结构更有利地分散吸附位点。此外，AS（v）平衡吸附数据通过Langmuir等温线良好，并且最大吸附能力为31.63mg / g，比常规氧化铝，碳，氧化铁等大于那种不同初始浓度下的吸附动力学遵循伪二阶模型。

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