Objective

In this article, monomers (tannic acid (TA) and m- phenylenediamine (MPD)) were used in the fabrication of a novel PES based thin-film composite nanofiltration (TFC-NF) membrane for the treatment of a common effluent treatment plant (CETP) of textile industrial wastewater.

Membrane synthesis

PES support sheets and TFC layers were fabricated via non-solvent induced phase inversion and in-situ interfacial polymerization (IP) process. The ultra-thin active layer was synthesized via the IP process with monomers such as tannic acid (TA) and m- phenylenediamine (MPD). T and M series membranes correspond to (PES/x wt% TA, x = 2, 4, 6) as T1, T2, T3 -TA and (PES/x wt% MPD, x = 2, 4, 6) as M1, M2, M3–MPD respectively. M0 corresponds to PES which is the virgin membrane.

Results

The chemical structure, surface morphology, surface roughness and surface properties were explored using fourier transform infrared (FTIR) spectroscopy, field emission scanning electron microscopy (FESEM), atomic force microscopy (AFM) and contact angle, respectively. The filtration performance of the thin-film composite nanofiltration (TFC-NF) membranes was investigated by various properties like pure water flux, salt rejection, porosity, mean pore radius and antifouling analysis.

Conclusion

T1-TA membrane showed better water permeability, high salt rejection and better industrial effluent rejection with 94.4% of TDS that are suitable for industrial reuse and agricultural irrigation. Moreover, for T1-TA membrane, the water flux, porosity, mean pore radius, salt rejection, surface roughness and contact angle of 43.5lm^− 2h^− 1, 47.1%, 16.7nm, 72.7%, 11.7nm and 41.48°was achieved respectively that was found to be higher than that of all the other fabricated membranes. Further, the rejection efficiency rate of textile effluent characteristics such as pH, turbidity, TDS, alkalinity, total hardness, BOD and COD were also achieved with maximum deduction in the T1-TA TFC-NF membrane compared to the M0-Virgin PES membrane. From the results, it can be confirmed that the T1-TA membrane significantly reduced the alkalinity, total hardness, BOD and COD rejections of 78%, 77.3%, 58.5% and 67.5% respectively, present in the effluent. Water flux recovery ratio (FRR) was improved from 74.6% for M0-Virgin PES membrane to 94.8% for T1-TA membrane. The modified TFC-NF membranes especially T1-TA, had better anti-fouling property and excellent hydrophilicity than the unmodified M0-Virgin PES membrane.

中文翻译：

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新型PES基纳滤薄膜复合膜制备中所涉及单体的影响及其在处理普通废水（CETP）纺织工业废水中的性能

客观的

在本文中，单体（单宁酸 (TA) 和间苯二胺 (MPD)）被用于制造一种新型 PES 基薄膜复合纳滤 (TFC-NF) 膜，用于处理普通污水处理厂（ CETP) 纺织工业废水。

膜合成

PES 支撑片和 TFC 层是通过非溶剂诱导相转化和原位界面聚合 (IP) 工艺制造的。超薄有源层是通过 IP 工艺用单宁酸 (TA) 和间苯二胺 (MPD) 等单体合成的。T 和 M 系列膜对应于 (PES/x wt% TA, x = 2, 4, 6) 作为 T1, T2, T3 -TA 和 (PES/x wt% MPD, x = 2, 4, 6) 作为 M1 , M2, M3–MPD 分别。M0 对应于原始膜 PES。

结果

分别使用傅里叶变换红外 (FTIR) 光谱、场发射扫描电子显微镜 (FESEM)、原子力显微镜 (AFM) 和接触角研究了化学结构、表面形态、表面粗糙度和表面性质。通过纯水通量、脱盐率、孔隙率、平均孔径和防污分析等各种特性研究了薄膜复合纳滤 (TFC-NF) 膜的过滤性能。

结论

T1-TA膜具有较好的透水性、较高的脱盐率和较好的工业废水脱除率，TDS达94.4%，适用于工业回用和农业灌溉。此外，对于 T1-TA 膜，水通量、孔隙率、平均孔径、脱盐率、表面粗糙度和接触角为 43.5lm ^{- 2} h ^{- 1}，分别达到 47.1%、16.7nm、72.7%、11.7nm 和 41.48°，发现高于所有其他制造的膜。此外，与 M0-Virgin PES 膜相比，T1-TA TFC-NF 膜的去除率也达到了纺织品流出物特性（如 pH 值、浊度、TDS、碱度、总硬度、BOD 和 COD）的截留率。结果表明，T1-TA膜显着降低了出水的碱度、总硬度、BOD和COD截留率，分别为78%、77.3%、58.5%和67.5%。水通量回收率 (FRR) 从 M0-Virgin PES 膜的 74.6% 提高到 T1-TA 膜的 94.8%。改性 TFC-NF 膜，尤其是 T1-TA，