菠萝皮渣纤维素/皂土复合水凝胶的制备及其染料吸附性能
Preparation and dye adsorption properties of pineapple peel cellulose/bentonite composite hydrogels
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摘要: 以菠萝皮渣纤维素(PPC)为原料,通过碱/尿素体系溶解纤维素并掺入皂土,利用化学交联和原位嵌入磁性Fe3O4制备复合水凝胶,并对其结构和染料吸附性能进行研究。结果表明:皂土和Fe3O4在复合水凝胶中成功嵌入,皂土有效改善了水凝胶的交联多孔网络结构、热稳定性和溶胀性能。此外,添加皂土有利于提高水凝胶对亚甲基蓝的吸附性能,其饱和吸附量从28.09 mg/g提高到55.87 mg/g;吸附过程符合准二级动力学模型和Langmuir模型,属于化学吸附和单分子层吸附过程。Abstract: The pineapple peel cellulose(PPC) was used as raw material to dissolve in an alkali/urea solution with incorporation of bentonite, then further chemically cross-linked and in-situ embedded with magnetic Fe3O4 to form composite hydrogels. The structure and dye adsorption properties of hydrogels were studied. The results confirmed the successful intercalation of bentonite and Fe3O4 in the hydrogels. The bentonite effectively improved the cross-linked porous network structure, thermal stability and swelling properties of the hydrogel. The bentonite also enhanced the methylene blue adsorption performance of the hydrogels, showing an increased saturated adsorption capacity from 28.09 mg/g to 55.87 mg/g. The adsorption process conformed to the pseudo-second-order kinetic model and Langmuir model, belonging to chemical adsorption and monolayer adsorption.
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Key words:
- pineapple peel /
- cellulose /
- bentonite /
- composite hydrogel /
- dye /
- adsorption property
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