Laboratory of Organic Synthesis Modeling and Optimization of Chemicals, Department of Process Engineering, Faculty of Technology, Badji Mokhtar-Annaba University, P.O. Box 12, Annaba 23000, Algeria.
Department of Process Engineering, Faculty of Technology, Badji Mokhtar-Annaba University, P.O. Box 12, Annaba 23000, Algeria.
Molecules. 2023 Apr 8;28(8):3313. doi: 10.3390/molecules28083313.
This study includes the characterization and exploitation of an abundant agricultural waste in Algeria, Alfa ( L.) leaf powder (ALP) as a biosorbent for the removal of hazardous triphenylmethane dyes, malachite green (basic green 4) and crystal violet (basic violet 3), from aqueous media under various operating conditions in batch mode. The effect of experimental parameters such as initial dye concentration (10-40 mg/L), contact time (0-300 min), biosorbent dose (2.5-5.5 g/L), initial pH (2-8), temperature (298-328 K), and ionic strength on dye sorption was investigated. The results of both dyes show that the increase in initial concentration, contact time, temperature, and initial pH of solution leads to an increase in biosorbed quantity, unlike the effect of ionic strength. The biosorption kinetics for triphenylmethane dyes on ALP was analyzed by pseudo-first-order, pseudo-second-order, Elovich, and intraparticle diffusion models proposed by the Weber-Morris equation. Equilibrium sorption data were analyzed by six isotherms, namely the Langmuir, Freundlich, Harkins-Jura, Flory-Huggins, Elovich, and Kiselev isotherms. The thermodynamic parameters were evaluated for both dyes. The thermodynamic results suggest that both dyes' biosorption is a typical physical process, spontaneous and endothermic in nature.
本研究包括对阿尔及利亚丰富的农业废弃物 Alfa（L.）叶粉（ALP）进行特性描述和利用，将其作为生物吸附剂，用于从水介质中去除危险的三苯甲烷染料孔雀石绿（碱性绿 4）和结晶紫（碱性紫 3），采用间歇模式在各种操作条件下进行。考察了初始染料浓度（10-40mg/L）、接触时间（0-300min）、生物吸附剂用量（2.5-5.5g/L）、初始 pH 值（2-8）、温度（298-328K）和离子强度等实验参数对染料吸附的影响。两种染料的结果均表明，初始浓度、接触时间、温度和初始 pH 值的增加都会导致生物吸附量的增加，而离子强度的影响则相反。采用拟一级、拟二级、Elovich 和 Weber-Morris 方程提出的内扩散模型对三苯甲烷染料在 ALP 上的吸附动力学进行了分析。通过 Langmuir、Freundlich、Harkins-Jura、Flory-Huggins、Elovich 和 Kiselev 等六种等温线对平衡吸附数据进行了分析。评估了两种染料的热力学参数。热力学结果表明，两种染料的吸附均为典型的物理过程，是自发和吸热的。
