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为提高纤维素对Ni(II)的吸附效果，通过环氧氯丙烷交联和苹果酸羧基化改性，制备具有良好吸附性能的羧基改性纤维素气凝胶。采用扫描电子显微镜、傅里叶变换红外光谱仪和X射线衍射仪系统表征材料羧基化前后的变化，结果表明，改性过程实现了纤维素表面羟基与苹果酸中羧基的有效酯化，所得气凝胶呈现典型的三维蜂窝状多孔结构。通过条件优化实验发现，当苹果酸与纤维素质量比为1.75∶1、磷酸二氢钠用量为0.5 g/g、130℃反应210 min时，制备的改性纤维素气凝胶在pH为7.0、吸附时间为120 min条件下，对Ni(II)的去除率可达92.61%。动力学及热力学分析结果表明，苹果酸改性纤维素气凝胶对Ni(II)的吸附过程可由准二级动力学模型描述，符合Langmuir等温吸附模型，且为自发进行的吸热过程。
Abstract：To improve the adsorption effect of cellulose on Ni(II),carboxyl-modified cellulose aerogels with good adsorption properties were prepared by epichlorohydrin cross-linking and carboxylation modification of malate.Scanning electron microscopy, Fourier transform infrared spectroscopy and X-ray diffraction were used to characterize the changes before and after carboxylation.Through the condition optimization experiment, it was found that, when the mass ratio of malic acid to cellulose was 1.75∶1,the amount of sodium dihydrogen phosphate was 0.5 g/g, and the reaction was 130 ℃ for 210 min, the removal rate of Ni(II)in the prepared modified cellulose aerogel could reach 92.61% under the conditions of pH=7.0 and adsorption time of 120 min.The results of kinetic and thermodynamic analysis showed that the adsorption process of Ni(II)by malic acid-modified cellulose aerogel could be described by the quasi-second-order kinetic model, which was in line with the Langmuir isothermal adsorption model and was a spontaneous endothermic process.
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基本信息:
DOI：
中图分类号:TQ427.26;O647.3;X703
引用信息:
[1]陈梁心铭,张丽芳,宋颖韬等.羧基改性纤维素气凝胶对Ni(II)的去除研究[J].沈阳理工大学学报,2025,44(05):67-73.
基金信息:
辽宁省教育厅高等学校基本科研项目(JYTMS20230217)