Mosoarca Giannin, Vancea Cosmin, Popa Simona, Dan Mircea, Boran Sorina
Faculty of Industrial Chemistry and Environmental Engineering, Politehnica University Timisoara, Bd. V. Parvan No. 6, 300223 Timisoara, Romania.
Materials (Basel). 2023 Jun 8;16(12):4252. doi: 10.3390/ma16124252.
The present study aimed to investigate the potential of a new lignocellulosic biosorbent material derived from mature leaves of sour cherry ( L.) for removing methylene blue and crystal violet dyes from aqueous solutions. The material was first characterized using several specific techniques (SEM, FTIR, color analysis). Then, the adsorption process mechanism was investigated through studies related to adsorption equilibrium, kinetics, and thermodynamics. A desorption study was also performed. Results showed that the Sips isotherm provided the best fit for the adsorption process of both dyes, with a maximum adsorption capacity of 168.6 (mg g) for methylene blue and 524.1 (mg g) for crystal violet, outperforming the capacity of other similar adsorbents. The contact time needed to reach equilibrium was 40 min for both studied dyes. The Elovich equation is the most suitable model for describing the adsorption of methylene blue, while the general order model is better suited for the adsorption of crystal violet dye. Thermodynamic analyses revealed the adsorption process to be spontaneous, favorable, and exothermic, with physical adsorption involved as the primary mechanism. The obtained results suggest that sour cherry leaves powder can be a highly efficient, eco-friendly, and cost-effective adsorbent for removing methylene blue and crystal violet dyes from aqueous solutions.
本研究旨在探究一种源自酸樱桃（L.）成熟叶片的新型木质纤维素生物吸附材料从水溶液中去除亚甲基蓝和结晶紫染料的潜力。首先使用几种特定技术（扫描电子显微镜、傅里叶变换红外光谱、颜色分析）对该材料进行表征。然后，通过与吸附平衡、动力学和热力学相关的研究来探究吸附过程机制。还进行了脱附研究。结果表明，Sips等温线最适合两种染料的吸附过程，亚甲基蓝的最大吸附容量为168.6（mg/g），结晶紫为524.1（mg/g），优于其他类似吸附剂的容量。两种研究染料达到平衡所需的接触时间均为40分钟。Elovich方程最适合描述亚甲基蓝的吸附，而通用级数模型更适合结晶紫染料的吸附。热力学分析表明吸附过程是自发、有利且放热的，主要机制为物理吸附。所得结果表明，酸樱桃叶粉可成为从水溶液中去除亚甲基蓝和结晶紫染料的高效、环保且经济高效的吸附剂。
