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- 저자 : Narges Mosallanejad (검색결과 1 건)
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Mehrorang Ghaedi,Narges Mosallanejad 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.3
Cadmium hydroxide nanowires loaded on activated carbon (Cd(OH)2-NW-AC) was applied for removalof malachite green (MG) and sunset yellow (SY) in single and binary component systems. This novelmaterial was characterized and identified by different techniques such as Brunauer, Emmett and Teller(BET), scanning electron microscopy (SEM), X-ray diffraction (XRD) analysis. Unique properties such ashigh surface area (>1271 m2 g-1) and low pore size (<35 A˚ ) and average particle size lower than 50 A˚ inaddition to high reactive atom and presence of various functional groups make it possible for efficientremoval of these two dyes. In the single component system in this study, maximum adsorption capacityof 80.6 for SY and 19.0 mg g-1 for MG at 25 ℃ was reported. The Langmuir model had very well fit withthe experimental data (R2 > 0.996). A better agreement between the adsorption equilibrium data andmono-component Langmuir isotherm model was found. The kinetics of adsorption for single and binarymixture solutions at different initial dye concentrations were evaluated by the nonlinear first-order andsecond-order models. The second-order kinetic model had very well fit with the dynamical adsorptionbehavior of a single dye for lower and higher initial dye concentrations. SY and MG without spectraoverlapping were chosen and analyzed with high accuracy in binary solutions. The effect of multi-solutesystems on the adsorption capacity was investigated. The isotherm constants for SY and MG were alsocalculated in binary component systems at concentrations within moderate ranges, the Langmuirisotherm model satisfactorily predicted multi-component adsorption equilibrium data. The competitiveadsorption favored the SY in the A mixture solution (both SY and MG concentration at 10 mg L-1) and Bmixture solution (25 mg L-1 of SY and 10 mg L-1 of MG). Also, in both cases, kinetic data was fairlydescribed by two-step diffusion model. An endothermic and spontaneous nature for the adsorption ofthe dyes studied were shown from thermodynamic parameters in single and binary component systems.
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