Malachite Green Dye Removal from Aqueous Solutions Using Invader Centaurea Solstitialis Plant and Optimization by Response Surface Method: Kinetic, Isotherm, And Thermodynamic Study
Abstract
Invasive plants reduce the yield by inhibiting the development of agricultural products. In this study, invasive (CS) plant which is agricultural waste was used as adsorbent for removal of Malachite Green (MG) from aqueous solution. The adsorbent - adsorbate relationship was examined by the spectrophotometric method and Fourier transform infrared (FTIR). The surface morphology was determined by scanning electron microscope (SEM). CS surface area was measured by Brunauer, the Emmett and Teller (BET) analysis. The experiments were designed and modeled by RSM. The correlation factor of the developed model was 0.984. The capacity of 90.816 mg.g-1 was achieved when MG solution with concentration of 312.5 mg.L-1 was adsorbed onto 0.325 g CS for 75 min at a pH of 7.5. In this work the shaking velocity and the adsorbent size were 150 rpm and 30 mesh respectively. Langmuir, Freundlich, Temkin, and Dubinin-Radushkevich (D-R) isotherms were studied. Temkin isotherm had the highest R2 of 0.997. The kinetics models of the adsorption process were investigated and fitted with pseudo-second-order kinetic (R2 = 0.9982). The intraparticle diffusion model reflected the involved two steps; the first comprehended the boundary diffusion layer, while the second introduced the intraparticle diffusion effects. The adsorption was found to be endothermic with a Gibbs free energy of -4.47 KJ.mol-1. It was noted that the adsorption process was irreversible with a max percentage of desorption process of 2.16%. Column experiments were conducted to realize the adsorption process. The efficiency of the column reached 99.5% after 40 min and stilled constant. As a result, CS has shown a potential for MG removal from aqueous solution.
Keywords
References
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Details
Primary Language
English
Subjects
Engineering
Journal Section
Research Article
Authors
Mohammed Saleh
0000-0002-3145-4457
Türkiye
Mutlu Yalvaç
0000-0002-1281-5712
Türkiye
Hüdaverdi Arslan
0000-0002-3053-6944
Türkiye
Melis Gün
0000-0001-7982-6013
Türkiye
Publication Date
December 31, 2019
Submission Date
October 1, 2019
Acceptance Date
November 13, 2019
Published in Issue
Year 2019 Number: 17
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