Modified durian seed as adsorbent for the removal of methyl red dye from aqueous solutions

被引：94
作者：
Ahmad M.A. [1 ]
Ahmad N. [1 ]
Bello O.S. [1 ,2 ]
机构：
[1] School of Chemical Engineering, Universiti Sains Malaysia, Engineering Campus, Nibong Tebal, 14300, Penang
[2] Department of Pure and Applied Chemistry, Ladoke Akintola University of Technology, P.M.B 4000, Ogbomoso, Oyo State
来源：
Applied Water Science | 2015年 / 5卷 / 04期
关键词：
Adsorption; Durian seeds; Endothermic; Methyl red dye; Spontaneous;
D O I：
10.1007/s13201-014-0208-4
中图分类号：
学科分类号：
摘要：
Mesoporous-activated carbon from durian seed (DSAC) was prepared; it was used as adsorbent for the removal of methyl red (MR) dye from aqueous solution. Textural and adsorptive characteristics of activated carbon prepared from raw durian seed (DS), char durian seed (char DS) and activated durian seed (DSAC) were studied using scanning electron microscopy, Fourier transform infra red spectroscopy, proximate analysis and adsorption of nitrogen techniques, respectively. Acidic condition favors the adsorption of MR dye molecule by electrostatic attraction. The maximum dye removal was 92.52 % at pH 6. Experimental data were analyzed by eight model equations: Langmuir, Freundlich, Temkin, Dubinin–Radushkevich, Radke–Prausnitz, Sips, Vieth–Sladek and Brouers–Sotolongo isotherms and it was found that the Freundlich isotherm model fitted the adsorption data most. Adsorption rate constants were determined using pseudo-first-order, pseudo-second-order, Elovich, intraparticle diffusion and Avrami kinetic model equations. The results clearly showed that the adsorption of MR dye onto DSAC followed pseudo-second-order kinetic model. Both intraparticle and film diffusion were involved in the adsorption process. The mean energy of adsorption calculated from D–R isotherm confirmed the involvement of physical adsorption. Thermodynamic parameters were obtained and it was found that the adsorption of MR dye onto DSAC was an endothermic and spontaneous process at the temperatures under investigation. © 2014, The Author(s).
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页码：407 / 423
页数：16
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