亚硝酸根离子在P(DMAEMA/HEMA)水凝胶中的吸附和扩散性能
ADSORPTION AND DIFFUSION OF NITRITE IONS BY P(DMAEMA/HEMA)HYDROGELS
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摘要: 研究亚硝酸根离子在P(DMAEMA/HEMA)水凝胶中的吸附和扩散行为.结果表明,P(DMAEMA/HEMA)水凝胶可以有效地除去水溶液中的亚硝酸根离子,且在pH 4—6的范围内具有较高的选择性和吸附容量.阴离子和季胺基团之间的吸附反应符合Langmuir吸附等温线.使用Fick第二定律计算出亚硝酸根离子的扩散系数.在pH 4.0时,扩散初期和晚期的扩散系数范围为(2-4)×10-6cm2·s-1.并考察了单体浓度、温度、HEMA/DMAEMA比率及溶液浓度对扩散系数的影响.
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关键词:
- P(DMAEMA/HEMA)水凝胶 /
- 亚硝酸根离子 /
- 吸附 /
- 扩散系数
Abstract: In the article,the adsorption and diffusion behavior of nitrite ions into polycationic(P(DMAEMA/ HEMA))hydogels is analyzed.During pH 4-6,nitrite ions can be removed efficiently with high selectivity. The results of the adsorption studies showed that the interaction between anions and quaternized amine groups agree with the Langmuir-type isotherm.At the same time,the diffusional behavior of nitrite anions from hydro-gels was investigated.Fiek s second law is used here to evaluate the diffusion coefficient of the nitrite into the hydrogels.At pH 4.0,early-time and late-time diffusion coefficients ranged from 2�10-6cm2·s-1to 4�10-6cm2·s-1.The influence of different factors,such as monomer concentration,temperature,concentration of the solution,and the ratio of HEMA/DMAEMA were tested.-
Key words:
- P(DMAEMA/HEMA)hydrogel /
- nitrite /
- adsorption /
- diffusion coefficient
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