Yarik Samia, Barka Bouaifel Fatiha, Bezzi Nacer, Akkari Imane, Kessi Sofia, Bouaouina Kenza
Faculty of Exact Sciences, Materials Technology and Process Engineering Laboratory (LTMGP), University of Bejaia, Bejaia, 06000, Algeria.
Department of Chemistry, Faculty of Sciences, University of Ferhat ABBAS Setif 1, El Bez, 19000, Algeria.
Environ Monit Assess. 2025 Jun 19;197(7):768. doi: 10.1007/s10661-025-14223-y.
Wasted lemon verbena leaves have been repurposed as an eco-friendly, cost-effective, and sustainable biosorbent for the removal of Methylene Blue (MB), a hazardous dye, from aqueous environments. The structure of the produced biosorbent, functional groups, morphology and surface charge could all be clearly understood by XRD, FTIR, SEM, pH and Boehm titration analysis. Batch sorption studies were then used to look at the effects of pH (2-10), dosage of biosorbent (0.05 g to 0.15 g), agitation speed (0-300 rpm), time (0-120 min), beginning MB concentration (20-80 mg.L), as well as temperature (20-50°C) and ionic force (via NaCl). At a pH of 5.13, 0.15 g of biosorbent, an agitation speed of 200 rpm and 20°C, MB uptake was determined to be 37.16 mg.g, indicating a significant removal. The equilibrium data were best described by the Freundlich adsorption model (R: 0.953, Adj. R: 0.945 and χ: 2.988) and the kinetic studies were well-fitted to the pseudo-second order model (R > 0.992, Adj. R > 0.990 and χ < 1.221). Thermodynamic analysis revealed that the adsorption process is spontaneous (ΔG° < -3.536 kJ.mol), endothermic (ΔH°: 8.184 kJ.mol), and physical in nature (Ea: 12.12 kJ.mol). This study highlights the potential of waste lemon verbena leaves as an effective biosorbent for removing toxic dyes from wastewater, offering an environmentally friendly and economical alternative for water treatment.
废弃的柠檬马鞭草叶已被重新用作一种环保、经济高效且可持续的生物吸附剂，用于从水环境中去除有害染料亚甲基蓝（MB）。通过X射线衍射（XRD）、傅里叶变换红外光谱（FTIR）、扫描电子显微镜（SEM）、pH值和 Boehm 滴定分析，可以清楚地了解所制备生物吸附剂的结构、官能团、形态和表面电荷。然后通过批次吸附研究考察了pH值（2 - 10）、生物吸附剂用量（0.05 g至0.15 g）、搅拌速度（0 - 300 rpm）、时间（0 - 120分钟）、初始MB浓度（20 - 80 mg·L），以及温度（20 - 50°C）和离子强度（通过氯化钠）的影响。在pH值为5.13、生物吸附剂用量为0.15 g、搅拌速度为200 rpm和温度为20°C的条件下，MB的吸附量测定为37.16 mg·g，表明去除效果显著。平衡数据最适合用Freundlich吸附模型描述（R：0.953，调整后R：0.945，χ：2.988），动力学研究很好地拟合了准二级模型（R＞0.992，调整后R＞0.990，χ＜1.221）。热力学分析表明，吸附过程是自发的（ΔG°＜ - 3.536 kJ·mol）、吸热的（ΔH°：8.184 kJ·mol），本质上是物理吸附（Ea：12.12 kJ·mol）。本研究突出了废弃柠檬马鞭草叶作为从废水中去除有毒染料的有效生物吸附剂的潜力，为水处理提供了一种环境友好且经济的替代方案。
