Abstract The Laponite (Lap) hydrogel capsule was prepared by adding the Lap solution dropwise to an aluminum salt solution. It showed good stability in pH 7–8 and salt solution. When screening with 6 different dyes, the Lap capsule showed a high affinity to cationic dyes, methylene blue (MEB) and crystal violet (CV), but a low affinity to anionic dyes. Further study revealed that adsorption capacities reached 405 mg/g for MEB and 506 mg/g for CV at C0 = 400 ppm, higher than the report of the silicates adsorbents in literature. Furthermore, they can be repeatedly used for dyes removal. The adsorption thermodynamic and kinetics were also investigated. Meanwhile, the capsules showed good selectivity to remove MEB and CV from their mixture with methyl orange. Finally, the Lap hydrogel was coated on a filter paper to prepare the Lap hydrogel membrane, which can be used to separate the oil-water emulsion solution. This preliminary investigation provides new knowledge to extend the application of Lap in wastewater purification and treatment.

中文翻译：

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用于选择性染料吸附和过滤分离的不同形状合成锂皂石水凝胶的制备

摘要 Laponite（Lap）水凝胶胶囊是通过将Lap溶液滴加到铝盐溶液中制备的。它在 pH 7-8 和盐溶液中表现出良好的稳定性。当用 6 种不同的染料进行筛选时，Lap 胶囊对阳离子染料、亚甲蓝 (MEB) 和结晶紫 (CV) 显示出高亲和力，但对阴离子染料的亲和力低。进一步研究表明，在 CO = 400 ppm 时，MEB 的吸附容量达到 405 mg/g，CV 的吸附容量达到 506 mg/g，高于文献中硅酸盐吸附剂的报道。此外，它们可以重复用于去除染料。还研究了吸附热力学和动力学。同时，胶囊显示出良好的选择性，可以从它们与甲基橙的混合物中去除 MEB 和 CV。最后，将Lap水凝胶涂覆在滤纸上制备Lap水凝胶膜，可用于分离油水乳化液。这项初步调查为扩大 Lap 在废水净化和处理中的应用提供了新的知识。