利比亚膨润土对亚甲基蓝染料吸附剂的性能:等温线、动力学和热力学研究

A. Jangher, S. M. Aghila, H. A. Jamhour, B. M. Mahara
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摘要

本研究概述了天然和活化的Umm-Al- Razam,利比亚膨润土粘土(利比亚地区东北部),作为阴离子染料,亚甲基蓝(MB)染料的吸附剂从水溶液;其中,吸附等温线实验应用于研究吸附剂用量在(0.1-1.2g), pH(1,3,5,7,9和11),初始MB浓度(5,10,20,30,40和50ppm),温度(25,35,45和55℃)和接触时间(5 - 120min)范围内的影响。首先利用红外光谱(FT-IR)、扫描电镜(SEM)和x射线衍射(XRD)技术对天然利比亚膨润土(NLBn)和活化利比亚膨润土(ALBn)进行了表征。采用不同模型(Langmuir、Freundlich和Temkin)描述系统的平衡等温线和Gibbs自由能变化(ΔG)等热力学参数。采用不同模型(Langmuir、Freundlich和Temkin)计算系统的平衡等温线和Gibbs自由能变化(ΔG)、焓变(ΔH)和熵变(ΔS)等热力学参数。结果表明,(NLBn)的平衡吸附数据更符合Langmuir吸附模型,而(ALBn)的平衡吸附数据更符合Temkin模型。不同浓度下(NLBn)和(ALBn)对MB的吸附量分别为4.3 mg/g和4.9 mg/g。研究了染料去除动力学,发现其遵循伪二级速率常数。结果表明,NLBn和ALBn对MB的吸附和解吸能力分别为95%和99%。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Performance of Libyan Bentonite as Adsorbent for Methylene Blue Dye: Isotherms, Kinetics and Thermodynamic Studies
This study provides an overview of natural and activated of Umm-Al- Razam, Libyan bentonite clay (north east of Libya region), as an offered adsorbent of anionic dye, methylene blue (MB) dye from aqueous solution; where the adsorption isotherms applied experimentally to investigate the effect of adsorbent dosage in a batch mode range from (0.1-1.2g), pH (1,3,5,7,9 and11), initial MB concentration (5,10,20,30,40 and 50ppm), temperature (25,35,45 and 55oC) and contact time range from (5 - 120min).The Characterization of natural Libyan bentonite (NLBn) and activated Libyan bentonite (ALBn)) was carried out firstly by infrared spectroscopy (FT-IR), electronic scanning microscopy(SEM) and X-ray diffraction (XRD) technique. The data analyzed by different models (Langmuir, Freundlich and Temkin) to describe the equilibrium isotherms and thermodynamic parameters such as Gibbs free energy change (ΔG) The data analyzed by different models (Langmuir, Freundlich and Temkin) to describe the equilibrium isotherms and thermodynamic parameters such as Gibbs free energy change (ΔG), enthalpy change (ΔH) and entropy change (ΔS) of the system were calculated. The results showed the equilibrium adsorption data of (NLBn) was fit better the Langmuir adsorption model but for (ALBn) was fit better to Temkin. The adsorption capacity for the removal of MB was 4.3 mg/g and 4.9 mg/g at different concentration on (NLBn) and (ALBn) respectively. Kinetics of dye removal was investigated and found to follow pseudo second order rate constant. The sorption and desorption capacity of MB was found to be 95% and 99% by both (NLBn and ALBn) respectively.
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