Al-Arjan Wafa Shamsan
Department of Chemistry, College of Science, King Faisal University, P.O. Box 400, Hufof 31982, Al-Ahsa, Saudi Arabia.
Polymers (Basel). 2023 Jan 9;15(2):340. doi: 10.3390/polym15020340.
Water pollution has become a leading problem due to industrial development and the resulting waste, which causes water contamination. Different materials and techniques have been developed to treat wastewater. Due to their self-assembly and photocatalytic behavior, membranes based on graphene oxide (GO) are ideal composite materials for wastewater treatment. We fabricated composite membranes from polylactic acid (PLA) and carboxylic methyl cellulose (CMC)/carboxyl- graphene oxide (GO--COOH) using the electrospinning technique and the thermal method. Then, a nanofibrous membrane (PLA/CMC/GO--COOH@Ag) was produced by loading with silver nanoparticles (Ag-NPs) to study its photocatalytic behavior. These membranes were characterized using Fourier-transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM) in order to investigate the behavior of the fabricated membranes. The degradation kinetics studies were conducted using mathematical models, such as the pseudo first- and second-order models, by calculating their regression coefficients (R). These membranes exhibited exceptional dye degradation kinetics. The R values for pseudo first order were PCGC = 0.983581, PCGC@Ag = 0.992917, and the R values for pseudo second order were PCGC = 0.978329, PCGC@Ag = 0.989839 for methylene blue. The degradation kinetics of Rh-B showed R values of PCGC = 0.973594, PCGC@Ag = 0.989832 for pseudo first order and R values of PCGC = 0.994392, PCGC@Ag = 0.998738 for pseudo second order. The fabricated nanofibrous membranes exhibited a strong π-π electrostatic interaction, thus providing a large surface area, and demonstrated efficient photocatalytic behavior for treating organic dyes present in wastewater. The fabricated PLA/CMC/GO--COOH@Ag membrane presents exceptional photocatalytic properties for the catalytic degradation of methylene blue (MB) dye. Hence, the fabricated nanofibrous membrane would be an eco-friendly system for wastewater treatment under catalytic reaction.
由于工业发展及其产生的废弃物导致水污染，水污染已成为一个主要问题，这些废弃物会造成水体污染。人们已经开发出不同的材料和技术来处理废水。基于氧化石墨烯（GO）的膜由于其自组装和光催化性能，是用于废水处理的理想复合材料。我们采用静电纺丝技术和热法，由聚乳酸（PLA）和羧甲基纤维素（CMC）/羧基氧化石墨烯（GO-COOH）制备了复合膜。然后，通过负载银纳米颗粒（Ag-NPs）制备了纳米纤维膜（PLA/CMC/GO-COOH@Ag），以研究其光催化性能。使用傅里叶变换红外光谱（FTIR）、X射线衍射（XRD）、扫描电子显微镜（SEM）和透射电子显微镜（TEM）对这些膜进行表征，以研究制备膜的性能。通过计算其回归系数（R），使用数学模型（如伪一级和二级模型）进行降解动力学研究。这些膜表现出优异的染料降解动力学。亚甲基蓝的伪一级反应R值为PCGC = 0.983581，PCGC@Ag = 0.992917，伪二级反应R值为PCGC = 0.978329，PCGC@Ag = 0.989839。罗丹明B的降解动力学表明，伪一级反应R值为PCGC = 0.973594，PCGC@Ag = 0.989832，伪二级反应R值为PCGC = 0.994392，PCGC@Ag = 0.998738。制备的纳米纤维膜表现出强烈的π-π静电相互作用，因此提供了较大的表面积，并对废水中存在的有机染料表现出高效的光催化性能。制备的PLA/CMC/GO-COOH@Ag膜对亚甲基蓝（MB）染料的催化降解具有优异的光催化性能。因此，制备的纳米纤维膜将是催化反应下废水处理的环保系统。
