物理涂覆具有氧化石墨烯量子点的纳滤膜，可同时提高水的渗透性和盐/染料的去除率,Advanced Materials Interfaces

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物理涂覆具有氧化石墨烯量子点的纳滤膜，可同时提高水的渗透性和盐/染料的去除率
Advanced Materials Interfaces ( IF 4.3 ) Pub Date : 2019-01-24 , DOI: 10.1002/admi.201801742
Guoke Zhao ₁ , Ruirui Hu ₁ , Yijia He ₁ , Hongwei Zhu ₁

Affiliation

通过压力辅助过滤方法在薄膜复合聚酰胺纳米过滤（NF）膜上制备了物理结合的氧化石墨烯量子点（GO QD）涂层，以同时提高膜的透水性和盐/染料截留率。这是首次使用碳纳米颗粒作为表面涂层来提高水过滤膜的效率的尝试。通过水接触角和ζ电势测量研究了GO QDs涂层对膜的亲水性和表面电荷的影响。使用GO QDs涂层，膜的表面粗糙度和亲水性增加，并且膜表面带更多的负电荷。在模型盐/染料水溶液和带负电荷的甲基橙中，GO QD涂覆的NF膜的透水性和盐/染料排斥率同时提高。透水性的提高可以归因于膜表面亲水性的提高，而盐/染料排斥率的提高则归因于表面电负性的提高。在测试过程中，GO QD的分离可以忽略不计，这通过使用透射电子显微镜（TEM）表征进行的长期稳定性测试得到了证实。GO QD's和NF膜表面之间的相互作用足够强，因此涂层表现出良好的耐久性。而增加的盐/染料截留率可归因于改善的表面电负性。在测试过程中，GO QD的分离可以忽略不计，这通过使用透射电子显微镜（TEM）表征进行的长期稳定性测试得到了证实。GO QD's和NF膜表面之间的相互作用足够强，因此涂层表现出良好的耐久性。而增加的盐/染料截留率可归因于改善的表面电负性。在测试过程中，GO QD的分离可以忽略不计，这通过使用透射电子显微镜（TEM）表征进行的长期稳定性测试得到了证实。GO QD's和NF膜表面之间的相互作用足够强，因此涂层表现出良好的耐久性。

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Physically Coating Nanofiltration Membranes with Graphene Oxide Quantum Dots for Simultaneously Improved Water Permeability and Salt/Dye Rejection

A physically bound coating of graphene oxide quantum dots (GO QDs) on thin‐film composite polyamide nanofiltration (NF) membranes is prepared through a pressure‐assisted filtration method to simultaneously improve the membranes' water permeability and salt/dye rejection. It is the first attempt to use carbon‐based nanoparticles as surface coating to improve the efficiency of water filtration membranes. Influences of the GO QDs' coating on the hydrophilicity and surface charge of the membranes are investigated by water contact angle and zeta potential measurements. With the GO QDs' coating, the surface roughness and hydrophilicity of the membranes increase, and the membrane surface becomes more negatively charged. Water permeability and salt/dye rejection of GO QD–coated NF membranes increase simultaneously in model salt/dye aqueous solutions, and negatively charged methyl orange. The increased water permeability can be ascribed to the improved membrane surface hydrophilicity, while the increased salt/dye rejection can be attributed to the improved surface electronegativity. The detachment of GO QDs during testing is negligible, which is confirmed by a long‐time stability test with transmission electron microscopy (TEM) characterizations. The interactions between GO QDs' and NF membranes' surface are strong enough so that the coating exhibits good durability.

更新日期：2019-01-24

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