Ramírez-Rodríguez Laura Cristina, Quintanilla-Carvajal María Ximena, Mendoza-Castillo Didilia Ileana, Bonilla-Petriciolet Adrián, Jiménez-Junca Carlos
Maestría en Diseño y Gestión de Procesos Facultad de Ingeniería, Campus Universitario Puente del Común, Universidad de la Sabana, Km. 7 Autopista Norte, Chia 25001, Colombia.
Agroindustrial Processes Research Group, Campus Universitario Puente del Común, Universidad de La Sabana, Km. 7 Autopista Norte, Chia 25001, Colombia.
Nanomaterials (Basel). 2022 Aug 10;12(16):2744. doi: 10.3390/nano12162744.
Chromium pollution represents a worldwide concern due to its high toxicity and bioaccumulation in organisms and ecosystems. An interesting material to remove metal ions from water is a whey-protein-based material elaborated by electrospinning, which is an emerging method to produce adsorbent membranes with diverse applications. The aim of this study was to prepare an adsorbent membrane of whey protein isolate (WPI) and polycaprolactone (PCL) by electrospinning to remove chromium ions from water. The adsorbent membrane was synthesized by a central composed design denaturing WPI using 2-Mercaptoethanol and mixing it with PCL to produce electrospun nanofibers. The adsorbent membrane was characterized by denaturation, Scanning Electron Microscope, Fourier-Transform Infrared Spectroscopy, Contact Angle, Thermogravimetric Analysis, and X-ray Photoelectron Spectrometry. The adsorption properties of this membrane were assessed in the removal of chromium. The removal performance of the membrane was enhanced by an increase in temperature showing an endothermic adsorption process. The adsorption process of chromium ions onto the nanofiber membrane followed the Sips adsorption isotherm, while the adsorption kinetics followed a pseudo-second kinetics where the maximum adsorption capacity was 31.0 mg/g at 30 °C and pH 2. This work provides a novel method to fabricate a hybrid membrane with amyloid-type fibrils of WPI and PCL, which is a promising adsorbent to remove heavy metal ions from water.
由于铬污染具有高毒性以及在生物体和生态系统中的生物累积性，它已成为一个全球性的问题。一种从水中去除金属离子的有趣材料是通过静电纺丝制备的基于乳清蛋白的材料，静电纺丝是一种新兴的制备具有多种应用的吸附膜的方法。本研究的目的是通过静电纺丝制备一种乳清蛋白分离物（WPI）和聚己内酯（PCL）的吸附膜，以从水中去除铬离子。该吸附膜是通过中心复合设计合成的，使用2-巯基乙醇使WPI变性，并将其与PCL混合以制备静电纺丝纳米纤维。通过变性、扫描电子显微镜、傅里叶变换红外光谱、接触角、热重分析和X射线光电子能谱对吸附膜进行了表征。评估了该膜在去除铬方面的吸附性能。温度升高增强了膜的去除性能，表明这是一个吸热吸附过程。铬离子在纳米纤维膜上的吸附过程遵循Sips吸附等温线，而吸附动力学遵循准二级动力学，在30°C和pH值为2时最大吸附容量为31.0 mg/g。这项工作提供了一种制备具有WPI和PCL淀粉样原纤维的混合膜的新方法，该混合膜是一种从水中去除重金属离子的有前景的吸附剂。
