A comparison of basic dye adsorption onto zeolitic materials synthesized from fly ash

This investigation reveals the adsorption characteristics of two basic dyes, thionine (TH) and safranine T (ST), onto fly ash (FA) and its three zeolitized products prepared at different hydrothermal conditions. Typical two-step isotherms were observed for TH adsorption onto four adsorbents, whereas...

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Veröffentlicht in:Journal of hazardous materials 2011-03, Vol.187 (1-3), p.562-573
Hauptverfasser: Atun, Gülten, Hisarlı, Gül, Kurtoğlu, Ayşe Engin, Ayar, Nihat
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container_end_page 573
container_issue 1-3
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container_title Journal of hazardous materials
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creator Atun, Gülten
Hisarlı, Gül
Kurtoğlu, Ayşe Engin
Ayar, Nihat
description This investigation reveals the adsorption characteristics of two basic dyes, thionine (TH) and safranine T (ST), onto fly ash (FA) and its three zeolitized products prepared at different hydrothermal conditions. Typical two-step isotherms were observed for TH adsorption onto four adsorbents, whereas the isotherms of the larger ST molecules were S-shaped. The adsorption capacities of the zeolitized fly ash (ZFA) estimated from the first plateau region of the TH isotherms was nearly twice the FA capacity. The capacities increased by up to five times in the second plateau region. The adsorption capacity of FA for ST is equivalent that of TH, whereas the capacities of ZFA are lower than those found for TH. The equilibrium results were well-described by the Freundlich isotherm model. The kinetic data obtained in the temperature range of 298–318K was analyzed using Paterson's and Nernst Plank's approximations based on the homogeneous surface diffusion model (HSDM). The thermodynamic functions for the transition state were evaluated from the temperature-dependence of the surface diffusion coefficients by applying the Eyring model.
doi_str_mv 10.1016/j.jhazmat.2011.01.075
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subjects adsorbents
Adsorption
Applied sciences
Approximation
Basic dyes
Carbon
Chemical engineering
Coal Ash
Coloring Agents - chemistry
Diffusion
dyes
Equivalence
Exact sciences and technology
Fly ash
Fly ash zeolites
Isotherms
Kinetics
Mathematical models
Microscopy, Electron, Scanning
Particulate Matter
Pollution
Safranine T
sorption isotherms
Spectroscopy, Fourier Transform Infrared
Surface chemistry
Surface diffusion
temperature
Thermodynamics
Thionine
Zeolites - chemistry
title A comparison of basic dye adsorption onto zeolitic materials synthesized from fly ash
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