Adsorptive-removal of Bromothymol Blue as Acidic-dye Probe from Water Solution Using Latvian Sphagnum Peat Moss: Thermodynamic Assessment, Kinetic and Isotherm Modeling

IF 1.1 Q3 CHEMISTRY, MULTIDISCIPLINARY

Current Green Chemistry Pub Date : 2019-03-31 DOI:10.2174/2452273203666190114144546

S. Lubbad, Balsam Kamal Abu Al-Roos, F. S. Kodeh

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引用次数: 15

Abstract

A green and environmental–friendly method for the removal of the hazardous bromothymol blue from aqueous solution was considered applying a hydrophilic, biocompatible and biodegradable natural sorbent of Latvian sphagnum peat moss, applying shaking-dispersive solid-phase extraction. First, the influence of shaking speed was evaluated at 300, 600, 900 U. Furthermore, the optimum conditions of dye-adsorption, such as pH, adsorption-equilibrium contact time, adsorbent mass, and adsorbate initial concentration were investigated. In addition, the adsorption equilibrium isotherms, thermodynamics, and kinetics were studied. Thus, the optimum removal of bromothymol blue was concluded at a shaking speed of 600 U. Regarding the dye adsorption at different pH, bromothymol blue showed two removal maxima at acidic (pH 2.5) and almost neutral (pH 7.5) media, reaching dye % removal of 80.8 and 88.2 %, respectively, in 120 min of adsorption equilibrium contact time. Moreover, the dye removal improved reasonably by increasing the concentration and the sphagnum dose. Additionally, the equilibrium isotherm plot correlated comparably to Langmuir's and Freundlich's models. Also, the adsorption kinetic study demonstrated a better correlation to pseudo-secondorder plot than to pseudo-first-order one. Finally, excellent reproducibility in % removal was demonstrated with RSD values of 2.2 and 2.7% at pH of 7.5 and 2.5, respectively.

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拉脱维亚泥炭藓吸附去除水溶液中溴百摩尔蓝酸性染料探针的热力学评价、动力学和等温模型

考虑采用拉脱维亚泥炭藓的亲水性、生物相容性和可生物降解的天然吸附剂，采用摇动分散固相萃取，从水溶液中去除有害的溴百里酚蓝，这是一种绿色环保的方法。首先，在300600900U下评估了振荡速度的影响。此外，还研究了染料吸附的最佳条件，如pH、吸附平衡接触时间、吸附剂质量和硫酸盐初始浓度。此外，还对吸附平衡等温线、热力学和动力学进行了研究。因此，在600U的振荡速度下得出了溴百里酚蓝的最佳去除率。对于不同pH下的染料吸附，溴百里草酚蓝在酸性（pH 2.5）和几乎中性（pH 7.5）介质中表现出两个最大去除率，在120分钟的吸附平衡接触时间内，染料的去除率分别达到80.8%和88.2%。此外，通过增加浓度和泥炭剂量，染料的去除率得到了合理的提高。此外，平衡等温线图与Langmuir和Freundlich模型的相关性相当。此外，吸附动力学研究表明，与拟二阶图相比，与拟一阶图的相关性更好。最后，在pH为7.5和2.5时，RSD值分别为2.2%和2.7%，证明了%去除的良好再现性。

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来源期刊

Current Green Chemistry CHEMISTRY, MULTIDISCIPLINARY-

CiteScore

4.30

自引率

13.60%

发文量