Tunable Graphene Oxide Nanofiltration Membrane for Effective Dye/Salt Separation and Desalination
Tunable Graphene Oxide Nanofiltration Membrane for Effective Dye/Salt Separation and Desalination
复制标题
可调谐氧化石墨烯纳滤膜，用于有效的染料/盐分离和脱盐。
DOI：
10.1021/acsami.1c16141
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发表时间：
2021-11-24
影响因子：
9.5
通讯作者：
Zhang, Shanqing
中科院分区：
文献类型：
--
作者：
Xing, Chao;Han, Jing;Zhang, Shanqing
有效的染料分离和脱盐是处理混合染料高盐度纺织废水的关键。在这项研究中，通过两级过滤，即染料/盐分离和淡化阶段，制备了层间距(D)可调的氧化石墨烯(GO)膜，以产生清洁的水。在第一阶段，在低压条件下(如0.3 Mpa)，d值约为7.60的膜适合于去除含盐废水中的染料。染料和盐(即Na2SO4)的截留率分别达到99%和6.5%，表明从高盐度染料废水中回收染料具有很大的潜力。在第二阶段，在较高的压力下(如0.8兆帕)，d值降低到约7.15ó，使膜具有淡化功能。从1.0g/L盐水(即Na2SO4)出发，单次过滤脱盐率可达51.8%。所制备的膜还具有优异的实用优势，包括超高的渗透率、显著的抗污染(对染料)性能和良好的稳定性。此外，随着多级过滤系统的堆叠，拟议的膜技术将能够再生染料和生产清洁的水。
Effective dye separation and desalination are critical for the treatment of highly saline textile wastewater with dye mixtures. In this study, a graphene oxide (GO) membrane with a tunable interlayer distance (d) was fabricated to generate clean water via two-stage filtration, namely, the dye/salt separation and desalination stages. In the first stage, under low pressure (e.g., 0.3 MPa), the membrane with a d value of ca. 7.60 Å was suitable for removing the dye from the saline wastewater. The dye and salt (i.e., Na2SO4) rejection rates of >99% and <6.5% were achieved, respectively, indicating the significant potential to recycle the dyes from the highly saline dye wastewater. In the second stage, under a higher pressure (e.g., 0.8 MPa), the d value was reduced to ca. 7.15 Å, bestowing the membrane with a desalination function. The desalination rate of a single filtration process could reach up to 51.8% from 1.0 g/L saline (i.e., Na2SO4) water. The as-prepared membrane also exhibited excellent practical advantages, including ultrahigh permeability, significant antifouling (against dye) performance, and excellent stability. Furthermore, with the stacking of multistage filtration systems, the proposed membrane technology will be capable of regenerating dye and producing clean water.