Sevim Fatih, Laçin Ömer, Demir Fatih, Erkiliç Ömer Faruk
Engineering Faculty Department of Chemical Engineering Ataturk University Erzurum 25100 Turkey.
Glob Chall. 2025 Apr 10;9(5):2500024. doi: 10.1002/gch2.202500024. eCollection 2025 May.
The discharge of industrial wastewater containing toxic dyes has significantly increased, posing risks to human health and aquatic ecosystems. The growing demand for dyes in the textile industry has driven research into effective and economical removal methods. Adsorption is widely preferred due to its low cost, non-toxic by-products, and eco-friendly nature. This study investigates the removal of Reactive-Blue-160 textile azo dye using a local natural clay mineral. The effects of contact time, pH, adsorbent dosage, and temperature on adsorption are examined, along with adsorbent characterization. Optimal conditions (pH 5.70, adsorbent dosage 2.0 g L⁻¹, contact time 60 min, and dye concentration 150 mg L⁻¹) achieve 93.05% removal. Characterization reveals a heterogeneous clay surface dominated by smectite and chlorite. The adsorption data are evaluated using isotherm and kinetic models, with Freundlich and pseudo-second-order providing the best fit. Thermodynamic analysis indicates spontaneous and endothermic adsorption, with a negative Gibbs free energy and a positive enthalpy change of 15.71 kJ mol⁻¹, confirming physical adsorption. These findings highlight the potential of natural clay minerals for dye removal, offering a sustainable solution for industrial wastewater treatment.
含有有毒染料的工业废水排放量显著增加，对人类健康和水生生态系统构成风险。纺织工业对染料的需求不断增长，推动了对有效且经济的去除方法的研究。吸附因其成本低、副产物无毒且环保的特性而被广泛青睐。本研究考察了使用一种当地天然粘土矿物去除活性蓝160纺织偶氮染料的情况。研究了接触时间、pH值、吸附剂用量和温度对吸附的影响，并对吸附剂进行了表征。在最佳条件（pH值5.70、吸附剂用量2.0 g L⁻¹、接触时间60分钟和染料浓度150 mg L⁻¹）下，去除率达到93.05%。表征显示粘土表面不均匀，以蒙脱石和绿泥石为主。使用等温线和动力学模型对吸附数据进行评估，Freundlich模型和伪二级模型拟合效果最佳。热力学分析表明吸附是自发的且为吸热过程，吉布斯自由能为负，焓变正值为15.71 kJ mol⁻¹，证实为物理吸附。这些发现突出了天然粘土矿物在去除染料方面的潜力，为工业废水处理提供了一种可持续的解决方案。
