Abstract Composite-nanofiltration membranes based on polysulfone (PSU) and functionalized graphene oxide (f-GO) were prepared for dye removal from aqueous media. Graphene oxide (GO) was introduced to enhance the performance of these membranes. GO was functionalized using an aminated heterocyclic compound, namely 6-amino-4-(4-nitrophenyl)-3-methyl-4-phenyl-4,7-dihydro-1H-pyrazolo-[3,4-b]pyridine-5carbonitrile. The f-GO was incorporated into the PSU membrane matrix in different weight ratios (0.25, 0.5, 1, 2 and 4 wt %). Characterizing the produced membranes with scanning electron microscope, Fourier Transform Infrared - Attenuated Total Reflectance (FTIR-ATR) and X-ray diffraction indicated the well dispersion of f-GO in the membrane matrix. The obtained membranes were applied to remove Congo red and methylene blue, as typical anionic and cationic dyes respectively from water. The modified membranes showed superior efficiency in terms of water flux and dye rejection upon being compared with the control membrane. The composite membranes loaded with f-GO exhibited promising dye removal efficiency for both dyes.

中文翻译：

---

富含功能化氧化石墨烯的聚砜纳滤膜用于去除废水中的染料

摘要 制备了基于聚砜 (PSU) 和功能化氧化石墨烯 (f-GO) 的复合纳滤膜，用于从水性介质中去除染料。引入氧化石墨烯（GO）以提高这些膜的性能。GO 使用胺化杂环化合物功能化，即 6-amino-4-(4-nitrophenyl)-3-methyl-4-phenyl-4,7-dihydro-1H-pyrazolo-[3,4-b]pyridine-5carbonitrile . f-GO 以不同的重量比（0.25、0.5、1、2 和 4 重量％）掺入 PSU 膜基质中。用扫描电子显微镜表征生产的膜，傅里叶变换红外-衰减全反射 (FTIR-ATR) 和 X 射线衍射表明 f-GO 在膜基质中的良好分散。所得膜用于去除刚果红和亚甲蓝，作为典型的阴离子染料和阳离子染料，分别来自水中。与对照膜相比，改性膜在水通量和染料截留率方面表现出优异的效率。载有 f-GO 的复合膜对两种染料均表现出良好的染料去除效率。