Hasanuddin Norilyani Izzati, Mokhtar Wan Nur Aini Wan, Othaman Rizafizah, Anuar Farah Hannan
Department of Chemical Sciences, Faculty of Science and Technology, Universiti Kebangsaan Malaysia, Bangi 43600, Selangor, Malaysia.
Polymer Research Center (PORCE), Faculty of Science and Technology, Universiti Kebangsaan Malaysia, Bangi 43600, Selangor, Malaysia.
Membranes (Basel). 2022 Feb 9;12(2):198. doi: 10.3390/membranes12020198.
In this work, the effect of magnesium silicate (MgSiO) as a filler on poly(lactic acid)-poly(ethylene glycol) (PLA-PEG) membrane was investigated towards the enhancement of adsorption capacity for removal of cationic dye. The preparation and fabrication of membranes were performed through copolymerization and phase inversion techniques. Analysis of functional groups, tensile strength, morphology and surface wettability were employed in the characterization of the membranes. After the addition of MgSiO, it was found that the PLA-PEG/MgSiO membrane presented a higher hydrophilic property with improved mechanical strength. Next, the adsorption of methylene blue (MB) was optimized using response surface methodology (RSM) with the parameters mass of membrane and initial concentration of MB solution. The effects of pH and ionic strength were also examined to determine the mechanism involved during adsorption processes, which later were found to be electrostatic interaction and ion-exchange mechanism. From the isotherms and kinetics studies, the PLA-PEG/MgSiO membrane was well fitted by the Freundlich model and pseudo second order model, respectively. This membrane also demonstrated reusable character of up to six cycles.
在本研究中，考察了硅酸镁（MgSiO）作为填料对聚乳酸-聚乙二醇（PLA-PEG）膜吸附阳离子染料能力的增强效果。通过共聚和相转化技术制备和制造膜。采用官能团分析、拉伸强度、形态和表面润湿性对膜进行表征。添加MgSiO后，发现PLA-PEG/MgSiO膜具有更高的亲水性和改善的机械强度。接下来，使用响应面法（RSM）对亚甲基蓝（MB）的吸附进行优化，参数为膜的质量和MB溶液的初始浓度。还研究了pH值和离子强度的影响，以确定吸附过程中涉及的机制，结果发现其为静电相互作用和离子交换机制。通过等温线和动力学研究，PLA-PEG/MgSiO膜分别与Freundlich模型和伪二级模型拟合良好。该膜还表现出高达六个循环的可重复使用特性。
