Aziz Humera, Ashraf Munir, Rizwan Muhammad, Riaz Umair, Akram Saba, Raza Ali, Hong Yong Jean Wan
Department of Environmental Sciences, Government College University, Faisalabad, 38040, Pakistan.
School of Culture and Design, Clothing Technology, HTW Berlin -University of Applied Sciences for Technology and Economics Berlin, Berlin, Germany.
Sci Rep. 2024 Dec 23;14(1):30611. doi: 10.1038/s41598-024-82456-x.
The rapid development in agriculture and industrial sectors has raised some serious global issues like heavy metals pollution of water resources. Cadmium (Cd) is amongst the major water pollutants worldwide. In this study, two novel sorbents were prepared by using post-consumer textile waste (PCTW). The waste denim fabric was recycled with environmentally friendly HO and Ozone through oxidation under alkaline conditions to produce several functional groups at the surface (named as ODF@H0 and ODF@0 respectively) that could trap the heavy metal cations from contaminated water. The functionalized fabric sorbents were characterized by Fourier transform infrared spectroscopy (FT-IR), X-Ray diffraction (XRD), scanning electron microscopy (SEM), and energy dispersive X-Ray (EDX) that revealed the presence of carboxylic acid, hydroxyl, and amine functional groups on their surfaces. The sorption isotherm, sorption kinetics and sorption thermodynamics were carried out to unravel the sorption process mechanism. The ODF@H0 sorbent was proved more effective by giving maximum adsorption capacity of (238.09 mg g) compared to Ozone treatment (175.44 mg g) for Cd and achieved within just 20 min for both sorbents. Pseudo 2nd order and Langmuir models confirmed the chemosorption as dominant mechanism for the monolayer sorption of Cd ions onto ODF@H202 and ODF@0. The sorption thermodynamic revealed the sorption process as endothermic and spontaneous in nature. The results showed that both ODF@H0 and ODF@0 sorbents have an efficient potential for sorbing Cd from contaminated water. Furthermore, both ODF@H0 and ODF@0 sorbents were also tested in a regeneration study to investigate the reuse of these sorbents, and we achieved marvelous results. Both sorbents gave up to 90% of the sorption capacity even after 10 recycles. Conclusively, both sorbents can have their implications for the preparation of filters that can be used for the treatment of wastewater. This study has practical significance by tackling the two environmental problems i.e. heavy metal pollution and denim waste.
农业和工业部门的快速发展引发了一些严重的全球性问题，如水资源的重金属污染。镉（Cd）是全球主要的水污染物之一。在本研究中，利用消费后纺织废料（PCTW）制备了两种新型吸附剂。废弃牛仔布在碱性条件下通过环保的过氧化氢（H₂O₂）和臭氧氧化进行回收，在其表面产生多个官能团（分别命名为ODF@H₂O₂和ODF@O），这些官能团能够从受污染的水中捕获重金属阳离子。通过傅里叶变换红外光谱（FT-IR）、X射线衍射（XRD）、扫描电子显微镜（SEM）和能量色散X射线（EDX）对功能化织物吸附剂进行了表征，结果表明其表面存在羧酸、羟基和胺官能团。通过研究吸附等温线、吸附动力学和吸附热力学来揭示吸附过程的机理。结果表明，ODF@H₂O₂吸附剂对镉的最大吸附容量为238.09 mg/g，比臭氧处理（175.44 mg/g）更有效，且两种吸附剂均在20分钟内达到最大吸附量。准二级动力学模型和朗缪尔模型证实了化学吸附是Cd离子在ODF@H₂O₂和ODF@O上单层吸附的主要机制。吸附热力学表明吸附过程是吸热且自发的。结果表明，ODF@H₂O₂和ODF@O吸附剂都具有从受污染水中吸附镉的高效潜力。此外，还对ODF@H₂O₂和ODF@O吸附剂进行了再生研究，以考察这些吸附剂的重复使用情况，并取得了良好的效果。即使经过10次循环，两种吸附剂仍能保持高达90%的吸附容量。总之，这两种吸附剂在制备用于废水处理的过滤器方面具有应用潜力。本研究通过解决重金属污染和牛仔布废料这两个环境问题具有实际意义。
