| 林 繁,赵玉杰,邓仕槐,夏 青,刘潇威,高尚宾,穆 莉.透析膜和凝胶膜生物有效态镉提取性能比较[J].农业环境科学学报,2014,33(8):1546-1552. |
| 透析膜和凝胶膜生物有效态镉提取性能比较 |
| Comparative Study of Dialysis Membranes and Hydrogels for Extracting Bioavailable Cadmium |
| |
| DOI：10.11654/jaes.2014.08.012 |
| 中文关键词: 凝胶膜 透析膜 扩散系数 解离能力 扩散边界层 |
| 英文关键词: hydrogel dialysis membrane diffusion coefficient dissociation ability diffusive boundary layer |
| 基金项目: |
|
| 摘要点击次数: 2779 |
| 全文下载次数: 2268 |
| 中文摘要: |
| 在实验研究的基础上，对透析膜D10000、D15000和凝胶膜的物理性能、离子强度和pH对扩散系数的影响、两种膜材料对有机结合态重金属的解离性能、扩散边界层进行了对比研究。结果表明，透析膜在使用、储存、价格等方面较凝胶膜有一定的优势，而凝胶膜则更具有定制性。在低离子强度下（小于0.001 mol·L-1），透析膜和凝胶膜受离子强度的影响较大，随着离子强度的升高，两种膜的扩散系数受离子强度的影响较小；pH（5~9）对两种膜的扩散系数影响不大。有机结合态镉通过D10000、D15000、凝胶膜的时间分别为97.65、109.65、652.25 s，有机结合态重金属通过凝胶膜更易解离。在离子强度为0.1 mol·L-1的中性静止水体中，D10000、D15000和凝胶膜的扩散边界层厚度分别为0.039、0.052 、0.052 cm，扩散边界层对透析膜的影响较对凝胶膜的影响大，并且在静止水体中不能忽略扩散边界层。 |
| 英文摘要: |
| 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. |
| HTML
查看全文
查看/发表评论 下载PDF阅读器 |
|
|
|
