Effects of Some Operating Parameters on Sorption and Desorption Kinetics Related to Spotted Golden Thistle Stalks and Methylene Blue; Isotherm Study at Optimal pH and Sorbent Regeneration

IF 2.1 4区化学 Q3 CHEMISTRY, PHYSICAL

Progress in Reaction Kinetics and Mechanism Pub Date : 2018-06-01 DOI:10.3184/146867818X15233705894365

Z. S. Bereksi, H. Benaïssa

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引用次数: 2

Abstract

In this work, the sorptive removal assessment of methylene blue by spotted golden thistle stalks was enhanced. Sorption was positively impacted by increasing temperature, initial pH or ionic strength. The sorbent isoelectrical point is 2.6 according to zeta potential measurements. The Elovich and Avrami models best fitted the sorption kinetic data; and an original prediction of equilibrium time is proposed. At 25 °C and for optimal initial pH = 7, the experimental maximal sorption capacity is 75 mg g−1. The Langmuir, Redlich–Peterson, Sips and Tóth models led to good correlations of isothermal data. Desorption percentages are important in both mineral and organic acidic media; the highest levels up to 91% were recorded for 1 × 10−2 M HCl solutions. The pseudo second-order model fitted satisfactorily the desorption kinetics. An innovative concept of regeneration is proposed, which promises significant savings of eluent and operating time. The sorbent regeneration assessment showed constant uptake abilities after five cycles of use.

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一些操作参数对斑点金蓟茎和亚甲基蓝吸附解吸动力学的影响最佳pH和吸附剂再生的等温研究

研究了斑点金蓟茎对亚甲基蓝的吸附去除效果。温度、初始pH值或离子强度对吸附有正向影响。根据zeta电位测量，吸附剂等电点为2.6。Elovich和Avrami模型最适合吸附动力学数据;并提出了平衡时间的原始预测。在25°C和最佳初始pH = 7时，实验最大吸附量为75 mg g−1。Langmuir, Redlich-Peterson, Sips和Tóth模型导致了等温数据的良好相关性。解吸百分比在无机和有机酸介质中都很重要;在1 × 10−2 M HCl溶液中记录的最高水平高达91%。伪二阶模型较好地拟合了解吸动力学。提出了一种创新的再生概念，有望显著节省洗脱液和操作时间。吸附剂再生评估表明，在5个循环使用后，吸附剂的吸收能力不变。

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来源期刊

Progress in Reaction Kinetics and Mechanism 化学-物理化学

CiteScore

2.10

自引率

0.00%

发文量

审稿时长

2.3 months

期刊介绍： The journal covers the fields of kinetics and mechanisms of chemical processes in the gas phase and solution of both simple and complex systems.