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Multi-functional tannic acid (TA)-Ferric complex coating for forward osmosis membrane with enhanced micropollutant removal and antifouling property
Journal of Membrane Science ( IF 9.5 ) Pub Date : 2021-02-16 , DOI: 10.1016/j.memsci.2021.119171
Su Liu , Xin Tong , Sihua Liu , Dong An , Junchen Yan , Yongsheng Chen , John Crittenden

A novel tannic acid - ferric (TA-Fe) complex coating was applied to commercially available cellulose triacetate (CTA) forward osmosis (FO) membrane to enhance membrane performance. Notably, the coated membrane attained a better water/salt selectivity than the control membrane and it had a mild water permeability loss of about 13.6%. Consequently, when the coated membrane is operated in the FO system, the reverse salt flux was smaller as compared to the uncoated commercially available membrane. Also, the rejection of three selected micropollutants improved and this is due to both increased membrane hydrophilicity and the decreased membrane effective pore size. In the membrane fouling tests, with the support layer facing the feed solution (PRO mode), the normalized water flux for the uncoated membrane decreased from 1 to about 0.4. For our membrane with a coating layer on the support layer side, the normalized water flux was higher than 0.5 after the test under the same conditions, confirming its improved antifouling property. The improvement was due to both the coated membrane's decreased surface roughness and the increased interaction energy barrier between the foulant and membrane. These test results represent a new contribution to wastewater treatment using FO based on the success of the authors' novel coating method and its potential to offer multiple performance improvements in osmotic pressure-driven membrane processes.



中文翻译:

用于正渗透膜的多功能单宁酸-铁复合涂层,具有增强的微污染物去除和防污性能

将一种新颖的单宁酸-铁(TA-Fe)复合涂层应用于市售的三乙酸纤维素(CTA)正渗透(FO)膜,以增强膜性能。值得注意的是,涂覆的膜比对照膜具有更好的水/盐选择性,并且其温和的水渗透性损失为约13.6%。因此,当涂覆的膜在FO系统中操作时,与未涂覆的市售膜相比,反向盐通量较小。同样,三种选定的微污染物的排斥也得到改善,这是由于膜亲水性增加和膜有效孔径减小所致。在膜污染测试中,支撑层面向进料溶液(PRO模式),未涂覆膜的归一化水通量从1降至约0.4。对于在支撑层侧具有涂层的膜,在相同条件下进行测试后,归一化水通量高于0.5,证实了其改善的防污性能。改善是由于涂层膜的表面粗糙度降低以及污垢物和膜之间的相互作用能垒增加。这些测试结果代表了基于FO的废水处理的新贡献,这是基于作者新颖的涂覆方法的成功及其在渗透压驱动膜工艺中提供多种性能改进的潜力。降低了表面粗糙度,增加了污垢和膜之间的相互作用能垒。这些测试结果代表了基于FO的废水处理的新贡献,这是基于作者新颖的涂覆方法的成功及其在渗透压驱动膜工艺中提供多种性能改进的潜力。降低了表面粗糙度,增加了污垢和膜之间的相互作用能垒。这些测试结果代表了基于FO的废水处理的新贡献,这是基于作者新颖的涂覆方法的成功及其在渗透压驱动膜工艺中提供多种性能改进的潜力。

更新日期:2021-02-23
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