Synthesis of New Membranes from a Physical Mixture of Two Polymers (PLA-PEI) for the Discoloration of Model Textile Effluents Using the Ultrafiltration Process
Aycha Essaadouni, Anissa El Absi, Mohamed Berradi, Omar Dagdag, Rachid Hsissou, Anouar El Magri, Mohammed Assouag, Hansang Kim, Rajesh Haldhar, Mustapha Tahaikt, Abderrahim El Bachiri, Mohamed Rafik
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Abstract
The objective of this study is to develop and evaluate innovative ultrafiltration (UF) composite membranes for water treatment applications, with a particular focus on decolorization. These composite membranes were created by physically combining polylactic acid (PLA) and polyetherimide (PEI) polymers in varying proportions. The resulting collodion was then affixed to a polyamide substrate, thereby endowing the membrane with mechanical strength. During the course of this study, three PEI concentrations were taken into consideration: 20%, 25%, and 30% by weight, corresponding to the membranes M20, M25, and M30, respectively. A series of hydrodynamic tests were conducted on the synthetic membranes, encompassing permeability and selectivity assessments. In addition to these hydrodynamic tests, a range of spectroscopic tests were performed, employing a variety of methodologies. These methodologies included Fourier Transform Infrared (FT-IR) spectroscopy, Nuclear Magnetic Resonance (NMR) spectroscopy, Scanning Electron Microscopy (SEM), Energy Dispersive X-ray (EDX) spectroscopy, and mechanical resistance testing. A series of ultrafiltration tests were conducted to assess the retention capabilities of the modified membranes. These tests utilized model textile effluents containing dyes such as methyl red (MR) and benzathren green (BG), with a transmembrane pressure of approximately 4 bar. Permeability studies revealed that the enhanced M20 membrane exhibited remarkable water permeability of over 340 L.m−2.bar−1, along with maximum dye rejection rates of 53.95% and 62.88% for MR and BG, respectively. The enhanced UF composite membrane's superior performance renders it a promising candidate for wastewater treatment and decolorization. The findings of this study demonstrate that the integration of polyamide support with PLA-PEI resulted in the development of an ultrafiltration membrane with exceptional performance.
本研究的目的是开发和评估用于水处理的新型超滤（UF）复合膜，特别关注脱色。这些复合膜是由不同比例的聚乳酸（PLA）和聚醚酰亚胺（PEI）聚合物物理结合而成的。然后将得到的胶体贴在聚酰胺衬底上，从而使膜具有机械强度。在本研究过程中，考虑了三种PEI浓度：20%，25%和30%重量，分别对应膜M20， M25和M30。对合成膜进行了一系列水动力测试，包括渗透性和选择性评估。除了这些水动力测试外，还进行了一系列光谱测试，采用了各种方法。这些方法包括傅里叶变换红外（FT-IR）光谱、核磁共振（NMR）光谱、扫描电子显微镜（SEM）、能量色散x射线（EDX）光谱和机械阻力测试。进行了一系列超滤试验，以评估改性膜的保留能力。这些试验利用含有甲基红（MR）和苯甲醚绿（BG）等染料的纺织品模型废水，跨膜压力约为4巴。透水性研究表明，增强后的M20膜具有显著的透水性，透水性超过340 l m−2。bar−1，MR和BG的最大染料去除率分别为53.95%和62.88%。增强型超滤复合膜的优越性能使其成为污水处理和脱色的理想选择。本研究的结果表明，聚酰胺载体与PLA-PEI的整合导致了一种性能优异的超滤膜的发展。图形抽象
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Water, Air, & Soil Pollution is an international, interdisciplinary journal on all aspects of pollution and solutions to pollution in the biosphere. This includes chemical, physical and biological processes affecting flora, fauna, water, air and soil in relation to environmental pollution. Because of its scope, the subject areas are diverse and include all aspects of pollution sources, transport, deposition, accumulation, acid precipitation, atmospheric pollution, metals, aquatic pollution including marine pollution and ground water, waste water, pesticides, soil pollution, sewage, sediment pollution, forestry pollution, effects of pollutants on humans, vegetation, fish, aquatic species, micro-organisms, and animals, environmental and molecular toxicology applied to pollution research, biosensors, global and climate change, ecological implications of pollution and pollution models. Water, Air, & Soil Pollution also publishes manuscripts on novel methods used in the study of environmental pollutants, environmental toxicology, environmental biology, novel environmental engineering related to pollution, biodiversity as influenced by pollution, novel environmental biotechnology as applied to pollution (e.g. bioremediation), environmental modelling and biorestoration of polluted environments.
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