Zhang Yang, Hu Jin-Ying, Li Guang-Zhe, Causserand Christel, Aimar Pierre
College of Chemistry and Life Science, Shenyang Normal University, Shenyang 110034, China.
Huan Jing Ke Xue. 2010 Jun;31(6):1513-7.
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 R(obs) of BPA decreased from 89% to 47% as the accumulated adsorption quantity of BPA onto the membrane increased to 30 microg x 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 microg x m(-2). The desorption test showed that the TBBPA could not pass through the membrane for its structure at the 5 x 10(5) Pa, 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.
采用实验室规模的死端过滤模块研究了纳滤膜Desal 5 DK对双酚A（BPA）和四溴双酚A（TBBPA）的去除效率，并探讨了两种分子在膜上的吸附作用，以了解过滤机制。结果表明，随着BPA在膜上的累积吸附量增加到30 μg·m⁻²，BPA的表观截留率（R(obs)）从89%降至47%。吸附层中高浓度的BPA导致水通量下降，尤其是在高压下。尽管TBBPA的累积吸附量达到50 μg·m⁻²，但由于其分子量和分子结构，Desal 5 DK对TBBPA的截留率仍高达95%以上。解吸试验表明，在5×10⁵ Pa的压力下，TBBPA因其结构无法透过膜，而BPA可以扩散透过膜，并在过滤30 mL后达到峰值浓度。从膜上释放的BPA量占Desal 5 DK膜吸附总量的30%。
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