评估改性的具有纳米孔的氧化石墨烯的超滤膜及其在水净化中的性能。
Evaluations of holey graphene oxide modified ultrafiltration membrane and the performance for water purification.
机构信息
State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin, 150090, PR China.
State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin, 150090, PR China.
出版信息
Chemosphere. 2021 Dec;285:131459. doi: 10.1016/j.chemosphere.2021.131459. Epub 2021 Jul 7.
Membrane technology has been widely used in the fields of drinking water treatment with the advantages of pollutants separation. However, membrane fouling has become main obstacle in further application. Graphene oxide (GO) and its functionalized derivatives are considered to be ideal membrane modification materials of membrane fouling control. However, GO coated membranes were suffered from serious flux decline which raises challenges for GO modification. In this study, porous holey graphene oxide (HGO) was synthesized by hydrothermal etched GO to modify UF membranes. Water permeability of HGO membrane was more than twice that of GO membrane at the loading of 0.08 g/m. At the optimal loading of 0.08 g/m, the rejection rate of HGO coated membrane on natural organic matter (NOM) such as bovine serum albumin (BSA), sodium alginate (SA) and humic acid (HA) was increased from 55%, 29%, 58%-85%, 72%, 92%, and the contact angle was reduced from 71° to 35° with the HGO coating amount of 0.04 g/m. Finally, the membrane fouling resistance distribution of each HGO membrane was analyzed given HA as model pollutant, and the effects of HGO on mitigating the organic fouling of Polyethersulfone (PES) membranes were discussed. The total fouling resistance decreased from 3.45 to 1.73 with HGO coating, the irreversible fouling decreased by 62.86%-95.83%. Standard blocking was dominated during filtration. It was also found that increasing the loading of HGO could delay the conversion of pore blocking to the cake layer. Overall, HGO coating has an application prospect for membrane fouling control.
膜技术具有污染物分离的优势，已广泛应用于饮用水处理领域。然而，膜污染已成为进一步应用的主要障碍。氧化石墨烯（GO）及其功能化衍生物被认为是控制膜污染的理想膜改性材料。然而，GO 涂层膜的通量衰减严重，这给 GO 改性带来了挑战。在这项研究中，通过水热刻蚀 GO 合成了多孔石墨烯氧化物（HGO），用于修饰 UF 膜。在 0.08g/m 的负载下，HGO 膜的水透过率是 GO 膜的两倍多。在最佳负载 0.08g/m 时，HGO 涂层对牛血清白蛋白（BSA）、海藻酸钠（SA）和腐殖酸（HA）等天然有机物（NOM）的截留率从 55%、29%、58%-85%、72%、92%提高到 92%，接触角从 71°降低到 35°，HGO 涂层量为 0.04g/m。最后，以 HA 为模型污染物，分析了各 HGO 膜的膜污染阻力分布，讨论了 HGO 对减轻聚醚砜（PES）膜有机污染的作用。HGO 涂层后总污染阻力从 3.45 降至 1.73，不可逆污染阻力降低了 62.86%-95.83%。过滤过程中主要是标准堵塞。还发现增加 HGO 的负载量可以延迟孔堵塞向滤饼层的转化。总体而言，HGO 涂层在膜污染控制方面具有应用前景。
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