Elzahar Medhat M H, Bassyouni M
Department of Civil Engineering, Faculty of Engineering, Port Said University, Port Fouad, Port Said, 42526, Egypt.
Department of Chemical Engineering, Faculty of Engineering, Port Said University, Port Fouad, Port Said, 42526, Egypt.
Sci Rep. 2023 Sep 21;13(1):15750. doi: 10.1038/s41598-023-42960-y.
This study investigated the feasibility of employing neat chitosan powder, polyacrylamide, and chitosan micro-beads as adsorbents for the rapid and efficient removal of Direct Blue 78 dye from textile industrial wastewater. A series of batch experiments were conducted to examine the impact of adsorbent dose, contact time, and pH on the adsorption process. The physicochemical analysis, including FTIR, zeta potential analysis, and SEM were performed to identify the adsorption mechanism of chitosan powder and micro-beads. It was found that increasing the powder chitosan dose to 4.5 g/L and contact time up to 40 min resulted in achieving a significant increase in dye removal efficiency up to 94%. The highest removal efficiency of 94.2% was achieved at an initial dye concentration of 50 mg/L, a chitosan dosage of 4.5 g/L, and an optimized contact time of 60 min. Utilizing a polyacrylamide gel dose of 45 mL/L reduced the sedimentation time of chitosan from 8 h to 5 min. Equilibrium studies showed an initial L-shaped equilibrium curve, indicating that the adsorption process primarily arises from electrostatic interactions between dye molecules and adsorbent particles (physical forces). The Langmuir isothermal model demonstrated the best fit to the equilibrium data. Combining chitosan powder with polyacrylamide gel emerges as an economically viable choice for dye removal in industrial wastewater effluents, offering a cost-effective alternative to pricey commercial adsorbents. The results of the study revealed that the presence of polyacrylamide dye enhanced the removal efficiency and settling time of DB78 dye using chitosan.
本研究考察了使用纯壳聚糖粉末、聚丙烯酰胺和壳聚糖微珠作为吸附剂，从纺织工业废水中快速高效去除直接蓝78染料的可行性。进行了一系列批量实验，以研究吸附剂剂量、接触时间和pH值对吸附过程的影响。进行了包括傅里叶变换红外光谱（FTIR）、zeta电位分析和扫描电子显微镜（SEM）在内的物理化学分析，以确定壳聚糖粉末和微珠的吸附机制。结果发现，将壳聚糖粉末剂量增加到4.5 g/L，接触时间延长至40分钟，可使染料去除效率显著提高，最高可达94%。在初始染料浓度为50 mg/L、壳聚糖剂量为4.5 g/L以及优化接触时间为60分钟的条件下，实现了94.2%的最高去除效率。使用45 mL/L的聚丙烯酰胺凝胶剂量可将壳聚糖的沉降时间从8小时缩短至5分钟。平衡研究显示出初始的L形平衡曲线，表明吸附过程主要源于染料分子与吸附剂颗粒之间的静电相互作用（物理力）。朗缪尔等温模型对平衡数据的拟合效果最佳。将壳聚糖粉末与聚丙烯酰胺凝胶结合，成为工业废水排放中去除染料的经济可行选择，为昂贵的商业吸附剂提供了一种经济高效的替代方案。研究结果表明，聚丙烯酰胺染料的存在提高了壳聚糖对DB7染料的去除效率和沉降时间。
