Key Laboratory of Songliao Aquatic Environment, Ministry of Education, Jilin Jianzhu University, Changchun, 130000, China.
State Key Laboratory of Separation Membranes and Membrane Processes, School of Environmental Science and Engineering, Tiangong University, Tianjin, 300387, China.
Chemosphere. 2022 Dec;308(Pt 2):136367. doi: 10.1016/j.chemosphere.2022.136367. Epub 2022 Sep 8.
Forward osmosis (FO) membrane fouling is one of the main reasons that hinder the further application of FO technology in the treatment of dye wastewater. To alleviate membrane fouling, a conductive coal carbon-based substrate and polydopamine nanoparticles (PDA NPs) interlayer composite FO membrane (CPFO) was prepared by interfacial polymerization (IP). CPFO-10 membrane prepared by depositing 10 mL of PDA NPs solution exhibited an optimum performance with water flux of 7.56 L/(mh) for FO mode and 10.75 L/(mh) for pressure retarded osmosis (PRO) mode, respectively. For rhodamine B and chrome black T dye wastewater treatment, the water flux losses were reduced by 21.6%, and 14.5% under the voltages of +1.5 V, and -1.5 V, respectively, compared with no voltage applied after the device was operated for 8 h. The applied voltage had little effect on the fouling mitigation performance of the CPFO membrane for neutral charged cresol red. After the device was operated for 4 cycles, the rejection rates of dyes wastewater treated by the CPFO membranes with applied voltage were close to 100%. The flux decline rate and flux recovery rate of CPFO membrane for rhodamine B and chrome black T wastewater treatment under application of +1.5 V and -1.5 V voltage after 4 cycles were 11.6%, 99.2%, and 16.7%, 98.9%, respectively. Therefore, the voltage-applied CPFO membrane still maintained good rejection and antifouling performance in long-term operation. This study provides a new insight into the preparation of conductive FO membranes for dye wastewater treatment and membrane fouling control.
正向渗透（FO）膜污染是阻碍 FO 技术在染料废水处理中进一步应用的主要原因之一。为了减轻膜污染，通过界面聚合（IP）制备了一种导电煤基碳基底和聚多巴胺纳米粒子（PDA NPs）夹层复合 FO 膜（CPFO）。用 10 mL 的 PDA NPs 溶液沉积制备的 CPFO-10 膜在 FO 模式下的水通量为 7.56 L/（m h），在压力延迟渗透（PRO）模式下的水通量为 10.75 L/（m h），分别表现出最佳性能。对于罗丹明 B 和铬黑 T 染料废水处理，在施加 +1.5 V 和 -1.5 V 电压的情况下，与未施加电压相比，水通量损失分别降低了 21.6%和 14.5%，在装置运行 8 h 后。施加电压对 CPFO 膜对中性带电荷的甲酚红的污染缓解性能影响不大。在经过 4 个循环后，施加电压的 CPFO 膜处理的染料废水的截留率接近 100%。在施加+1.5 V 和-1.5 V 电压下，CPFO 膜对罗丹明 B 和铬黑 T 废水处理的通量下降率和通量恢复率分别为 11.6%、99.2%和 16.7%、98.9%。因此，在长期运行中，施加电压的 CPFO 膜仍保持良好的截留和抗污染性能。本研究为制备用于染料废水处理和膜污染控制的导电 FO 膜提供了新的思路。
