Department of Environmental Science, School of Earth Sciences, Central University of Rajasthan, Ajmer-305817, Rajasthan, India.
Department of Botany, University of Delhi, Delhi 110007, India.
Environ Res. 2024 Mar 15;245:118041. doi: 10.1016/j.envres.2023.118041. Epub 2023 Dec 30.
In recent years, there has been a growing focus on treating textile wastewater due to its escalating threat to aquatic ecosystems and exposed communities. The present study investigates the adsorption efficacy of biopolymer functionalized nanoscale zero-valent iron (CS@nZVI) composite for the treatment of textile wastewater using the RSM-CCD model. The structure and morphology of CS@nZVI were characterized using XRD, FTIR, FESEM, and EDX. CS@nZVI was then evaluated for its adsorption potential in removing COD, color, and other physico-chemical parameters from textile wastewater. The results showed the high efficacy of CS@nZVI for COD and color removal from textile wastewater. Under optimal conditions (pH 6, contact time 60 min, and 1.84 g CS@nZVI), COD removal reached a maximum of 85.53%, and decolorization efficiency was found to be 89.73%. The coefficient of determination R (0.98) and AIC (269.75) values suggested quadratic model as the best-fitted model for optimizing the process parameters for COD removal. Additionally, the physico-chemical parameters were found to be within permissible limits after treatment with CS@nZVI. The influence of coexisting ions on COD removal followed the order PO > SO > Cl >Na > Ca. The kinetics data fitted well with the pseudo-first-order reaction, indicating physisorption as the primary mechanism. The thermodynamic study revealed the endothermic nature of the removal process. Reusability tests demonstrated that great regeneration capacity of spent CS@nZVIafter five consecutive cycles. Furthermore, toxicological studies showed reduced toxicity in treated samples, leading to improved growth of Vigna radiata L. These findings suggest that CS@nZVI bionanocomposites could serve as an efficient, cost-effective, and eco-friendly remediation agent for the treatment of textile effluents, presenting significant prospects for commercial applications.
近年来，由于纺织废水对水生生态系统和暴露社区的威胁不断加剧，人们越来越关注纺织废水的处理。本研究采用 RSM-CCD 模型，研究了生物聚合物功能化纳米零价铁（CS@nZVI）复合材料对纺织废水的吸附效果。采用 XRD、FTIR、FESEM 和 EDX 对 CS@nZVI 的结构和形态进行了表征。然后，评估了 CS@nZVI 对去除纺织废水中 COD、颜色和其他理化参数的吸附潜力。结果表明，CS@nZVI 对去除纺织废水中的 COD 和颜色具有很高的效果。在最佳条件（pH 6、接触时间 60 分钟和 1.84 g CS@nZVI）下，COD 去除率最高可达 85.53%，脱色效率为 89.73%。决定系数 R（0.98）和 AIC（269.75）值表明，二次模型是优化 COD 去除过程参数的最佳拟合模型。此外，用 CS@nZVI 处理后，理化参数均在允许范围内。共存离子对 COD 去除的影响顺序为 PO > SO > Cl > Na > Ca。动力学数据与伪一级反应拟合良好，表明主要是物理吸附机制。热力学研究表明，去除过程是吸热的。重复使用测试表明，经过五次连续循环后，CS@nZVI 的再生能力很强。此外，毒理学研究表明，处理后的样品毒性降低，导致 Vigna radiata L. 的生长得到改善。这些发现表明，CS@nZVI 生物纳米复合材料可以作为一种高效、经济实惠、环保的修复剂，用于处理纺织废水，具有显著的商业应用前景。
