Membrane Science and Separation Technology Division, CSIR-Central Salt and Marine Chemicals Research Institute (CSIR-CSMCRI), Council of Scientific & Industrial Research (CSIR), Bhavnagar, India.
Environ Technol. 2022 Jun;43(14):2155-2166. doi: 10.1080/09593330.2020.1869316. Epub 2021 Jan 18.
Post treatment is a very competent and scalable approach to develop the higher water-flux and salt-rejection membrane since it does not require any change in existing manufacturing process. The virgin Thin Film Composite Reverse Osmosis (TFC-RO) membrane was exposed to various concentrations of Poly (ethylene Glycol) diacrylate (PEGDA) and Ethylene glycol dimethacrylate (EGDMA) after activation with sodium hypochlorite for 1 h. Crosslinkers modified membranes were characterized for degree of wettability by contact angle analyses, surface morphology and surface roughness study by Scanning electron micrographs and Atomic force micrographs, chemical structural modifications by Attenuated total reflectance Fourier transform Infrared spectroscopy. These treatments resulted in improved membrane performance. 3500 mg/l PEGDA-treated membrane permeate flux increased by 48.7% and salt-rejection by 3.43%. 2000 mg/l EGDMA treated membrane demonstrated 46.13% increase in water-flux and 3.08% increase in salt-rejection as compared with virgin membrane. Organic fouling study indicated that fouling in PEGDA-treated membrane was significantly lower than virgin membrane. Heavy metal ion removal performances for Zinc and Chromium were also higher for modified membranes. Thus, the surface modification by crosslinkers led to increase in selectivity for certain metal ions and better antifouling performance as compared to virgin membrane.
后处理是一种非常有能力且可扩展的方法，可以开发出具有更高水通量和更高盐阻的膜，因为它不需要对现有制造工艺进行任何改变。原始的薄膜复合反渗透（TFC-RO）膜在经过次氯酸钠 1 小时的活化后，暴露于不同浓度的聚（乙二醇）二丙烯酸酯（PEGDA）和乙二醇二甲基丙烯酸酯（EGDMA）中。通过接触角分析、扫描电子显微镜和原子力显微镜的表面形貌和表面粗糙度研究、衰减全反射傅里叶变换红外光谱的化学结构修饰，对交联剂改性膜的润湿性进行了表征。这些处理导致了膜性能的提高。3500mg/L 的 PEGDA 处理膜的渗透通量增加了 48.7%，盐阻增加了 3.43%。2000mg/L 的 EGDMA 处理膜的水通量增加了 46.13%，盐阻增加了 3.08%，与原始膜相比。有机污染研究表明，PEGDA 处理膜的污染明显低于原始膜。改性膜对锌和铬的重金属离子去除性能也更高。因此，与原始膜相比，交联剂的表面改性导致对某些金属离子的选择性增加和更好的抗污染性能。
