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| Comparative Study of Dialysis Membranes and Hydrogels for Extracting Bioavailable Cadmium |
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| KeyWord:hydrogel; dialysis membrane; diffusion coefficient; dissociation ability; diffusive boundary layer |
| Author Name | Affiliation | | LIN Fan | College of Resource and Environment, Sichuan Agricultural University, Chengdu 611130, China | | ZHAO Yu-jie | Agro-Environmental Protection Institute, Ministry of Agriculture, Tianjin 300191, China | | DENG Shi-huai | College of Resource and Environment, Sichuan Agricultural University, Chengdu 611130, China | | XIA Qing | Agro-Environmental Protection Institute, Ministry of Agriculture, Tianjin 300191, China | | LIU Xiao-wei | Agro-Environmental Protection Institute, Ministry of Agriculture, Tianjin 300191, China | | GAO Shang-bin | Agro-Environmental Protection Institute, Ministry of Agriculture, Tianjin 300191, China | | MU Li | Agro-Environmental Protection Institute, Ministry of Agriculture, Tianjin 300191, China |
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| Abstract: |
| In the present study, physical properties of dialysis membranes, D10000 and D15000, and hydrogels, effects of ionic strength and pH on diffusion coefficients, dissociation ability of metal complexes in two types of membranes, and diffusive boundary layer were studied. Dialysis membranes had advantages in application, storage and price, while hydrogels were more customization. At low ionic strength（less than 0.001 mol·L-1）, ionic strength had profound effects on both dialysis membranes and hydrogels. With increasing ionic strength，effects on diffusion coefficients of both membranes by the ionic strength were small. pH had little effects on diffusion coefficients of both membranes at pH 5~9. The time of Cd complexes to pass through D10000, D15000 and hydrogels was 97.65 s, 109.65 s and 652.25 s, respectively. Cadmium complexes were more prone to dissociate through hydrogels than through dialysis membranes. The thickness of diffusion boundary layer of D10000, D15000 and hydrogels were respectively 0.039 cm, 0.052 cm and 0.052 cm in the neutral static water at 0.1 mol·L-1 of ionic strength. Influence of diffusion boundary layer on dialysis membranes was greater than on hydrogels, which could not be neglected in the neutral static water. |
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