Department of Chemistry, College of Science and Arts, Najran University, P.O. Box, 1988, Najran 11001, Saudi Arabia; Advanced Materials and Nano-Research Centre, Najran University, Najran 11001, Saudi Arabia.
Department of Chemistry, College of Science and Arts, Najran University, P.O. Box, 1988, Najran 11001, Saudi Arabia.
Int J Biol Macromol. 2024 Jan;254(Pt 1):127767. doi: 10.1016/j.ijbiomac.2023.127767. Epub 2023 Oct 30.
Water pollution by organic dyes is one of the most serious environmental problems worldwide. Malachite green (MG) is considered as one the serious organic dyes which is discharged in wastewater by leather and textile manufacturing plants. MG dye can cause severe hazards to the environment and human health. Therefore, the removal of MG dye from wastewater is very important and essential. This study aims to synthesize a new magnetic hydrochar grafted to chitosan (MWSHC@CS) for the removal of MG dye from the aqueous solutions. Transmission electron microscopy (TEM), Fourier-transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), Brunauer-Emmett-Teller (BET) surface area, and Zeta potential analysis were used to characterize the synthesized MWSHC@CS. Batch experiments were conducted to optimize MG dye adsorption conditions, including adsorbent mass, pH, temperature, initial concentration, and contact time. The results revealed that MWSHC@CS had an excellent removal efficiency (96.47 %) for MG dye at the optimum condition (at m: 20 mg, pH: 7.5, t: 420 min, and T: 298 K). Adsorption isotherms outcomes revealed the MG adsorption data were best fit by the Langmuir model with a maximum adsorption capacity (420.02 mg/g). Adsorption kinetics outcomes exhibited that the adsorption process of MG dye fitted well to the Elovich model. The thermodynamic results revealed that the adsorption process was physical, exothermic, and spontaneous. The adsorption mechanisms of MG onto MWSHC@CS were hydrogen bonding, electrostatic interaction, and π-π interactions. Furthermore, MWSHC@CS showed excellent reusability for the removal of MG over five cycles of adsorption-desorption (83.76 %). In conclusion, the study provides a new, low-cost, and effective magnetic nanocomposite based on chitosan as a promising adsorbent for the high-performance removal of MG dye from aqueous solutions.
水污染是全世界最严重的环境问题之一。孔雀石绿（MG）被认为是一种严重的有机染料，会被皮革和纺织制造厂排放到废水中。MG 染料会对环境和人类健康造成严重危害。因此，去除废水中的 MG 染料非常重要。本研究旨在合成一种新的磁性水凝胶接枝壳聚糖（MWSHC@CS），用于从水溶液中去除 MG 染料。透射电子显微镜（TEM）、傅里叶变换红外光谱（FTIR）、X 射线衍射（XRD）、BET 比表面积和 Zeta 电位分析用于表征合成的 MWSHC@CS。进行了批实验来优化 MG 染料吸附条件，包括吸附剂质量、pH、温度、初始浓度和接触时间。结果表明，MWSHC@CS 在最佳条件下（m：20mg、pH：7.5、t：420min、T：298K）对 MG 染料具有优异的去除效率（96.47%）。吸附等温线结果表明，MG 吸附数据最符合朗缪尔模型，最大吸附容量为 420.02mg/g。吸附动力学结果表明，MG 染料的吸附过程符合 Elovich 模型。热力学结果表明，吸附过程是物理的、放热的和自发的。MG 吸附到 MWSHC@CS 的吸附机制是氢键、静电相互作用和π-π相互作用。此外，MWSHC@CS 在五次吸附-解吸循环（83.76%）中表现出优异的可重复使用性，用于去除 MG。总之，本研究提供了一种基于壳聚糖的新型、低成本、高效的磁性纳米复合材料，作为一种有前途的吸附剂，可用于从水溶液中高效去除 MG 染料。
