| 纳滤去除水中内分泌干扰物双酚A和四溴双酚A的研究 |
| 摘要点击 1990 全文点击 1211 投稿时间：2009-08-07 修订日期：2010-01-07 |
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| 中文关键词 纳滤 双酚A 四溴双酚A 吸附 截留率 |
| 英文关键词 nanofiltration bisphenol A （BPA） tetrabromobisphenol A （TBBPA） adsorption rejection |
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| 中文摘要 |
| 用死端过滤法考察纳滤膜Desal 5 DK处理水中内分泌干扰物双酚A（BPA）和四溴双酚A（TBBPA）的效率，并研究吸附对纳滤截留有机分子的影响.结果表明，纳滤膜Desal 5 DK对BPA的表观截留率随累积吸附量的增加而降低，从初始的89%降至达到平衡状态时的47%，BPA累积吸附量相应达到约30 μg·m-2.较高压力时，吸附层较高的溶质浓度引起膜通量下降.虽然Desal 5 DK对TBBPA累积吸附量达到50 μg·m-2，但由于分子量较大和分子结构复杂，截留率较高（>95%）.5×105 Pa压力下解吸时TBBPA分子由于位阻效应几乎不能透过纳滤膜；而BPA则扩散通过纳滤膜，并且在流出30 mL时浓度达到峰值，流出的BPA总量约占总吸附量的30%. |
| 英文摘要 |
| The removal efficiency of BPA and TBBPA by nanofiltration membrane Desal 5 DK has been investigated with a lab-scale dead-end filtration module and the role of adsorption of two molecules on membrane was also explored to understand the filtration mechanism. The results showed that the Robs of BPA decreased from 89% to 47% as the accumulated adsorption quantity of BPA onto the membrane increased to 30 μg·m-2. The high BPA concentration in adsorption layer caused the water flux decline especially at high pressure. The high TBBPA rejection of over 95% by Desal 5 DK was obtained due to the molecular weight and molecular structure although the accumulated adsorption quantity of TBBPA reached 50 μg·m-2. The desorption test showed that the TBBPA could not pass through the membrane for its structure at the 5×105Pa, while BPA could diffuse through the membrane and the peak concentration was obtained after 30 mL filtration. The quantity of BPA released from the membrane contributed 30% of the total amount adsorbed by the membrane Desal 5 DK. |
