Kinetic, equilibrium and thermodynamic studies of synthetic dye removal using pomegranate peel activated carbon prepared by microwave-induced KOH activation
Kinetic, equilibrium and thermodynamic studies of synthetic dye removal using pomegranate peel activated carbon prepared by microwave-induced KOH activation
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DOI：
10.1016/j.wri.2014.06.002
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发表时间：
2014-08-01
影响因子：
5.1
通讯作者：
Bello, Olugbenga Solomon
中科院分区：
文献类型：
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作者：
Ahmad, Mohd Azmier;Puad, Nur Azreen Ahmad;Bello, Olugbenga Solomon
采用微波诱导和KOH活化技术将菠萝皮转化为活性炭。采用FT 1 R、TGA、SEM、BET等方法对所制备的活性炭进行了表征. BET测试结果表明，催化剂的比表面积（941.02 m2/g）和总孔容（0470 cm 3/g）均显著增加。考察了不同pH值、染料初始浓度、接触时间和溶液温度等操作参数对PPAC吸附雷马唑艳蓝活性染料（RBBR）的影响。pH = 2时，染料的最佳去除率为94.36%。染料的去除量取决于初始染料浓度和溶液温度。吸附动力学符合准二级动力学模型。采用Langmuir、Freundlich、Temkin、Dubinin-Radushkevich、Raclke Prausnite、Sips、VietSladek和Brouers-Sotolongo等8种吸附等温线模型对实验数据进行了拟合，发现Freundlich模型对吸附数据拟合最好，相关系数最高（R2 >= 0.99），归一化标准差Aqc最小。颗粒内和他的扩散支配的吸附过程。计算了热力学参数，如标准吉布斯自由能（Δ G（0））、标准焓（Δ H-0）、标准熵（Δ S-0）和活化能（E-a）。PPAC对RBBR染料的吸附是自发的、放热的。研究表明，吸附遵循物理吸附机理。(C)2014作者由爱思唯尔公司出版。这是一个开放获取的文章下，CC BY-NC-ND许可证。
Pomegranate peel was converted into activated carbon using microwave induced and KOH activation techniques. The prepared activated carbon (PPAC) was characterized using FT1R, TGA, SEM, and nitrogen -adsorption surface area (BET). BET measurements gave remarkable increase in both the surface area (941.02 m(2)/g) and total pore volume (0470 cm(3)/g). Various operational parameters such as pH, initial dye concentration, contact time and solution temperature in batch systems were investigated on the use of PPAC in the adsorption of remazol brilliant blue reactive (RBBR) dye. At pH 2, the optimum dye removal was 94.36%. The amount of dye removed was dependent on initial dye concentration and solution temperature. Adsorption kinetics was found W follow pseudo-second-order kinetic model. Experimental data were analyzed using eight model equations: Langmuir, Freundlich, Temkin, Dubinin-Radushkevich, Raclke Prausnite, Sips, VietSladek and Brouers-Sotolongo isotherms and it was found that the Freundlich isotherm model fitted the adsorption data most with the highest correlation (R2 >= 0.99) and lowest normalized standard deviation, Aqc. Both intra-particle and him diffusion governed the adsorption process. Thermodynamic parameters, such as standard Gibbs free energy (Delta G(0)), standard enthalpy (Delta H-0),standard entropy (Delta S-0), and the activation energy (E-a) were calculated. The adsorption of RBBR dye onto PPAC was found to be spontaneous and exothermic in nature. This study shows that the adsorption follows physisorption mechanism. (C) 2014 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license.