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    Öğe
    A novel sorbent for removal of reactive textile dye: TDPA-KCl
    (Springer Heidelberg, 2019) Tosun Satır, İlknur; Sayın, Fatih; Gedikbey, Tevfik; Tunalı Akar, Sibel
    The use of alunite as an adsorbent for the removal of dye was the aim of this report. Mixing the alunite with different salts may allow adsorption with higher efficiency. In the present study, the thermal decomposition productof alunite-potassium chloride mixture (TDPA-KCl) was used efficiently and inexpensively to remove Reactive Blue 49 (RB49) dye. The adsorption capacity of TDPA-KCl was found to be affected by pH, temperature, adsorbent amount, calcination temperature, dye concentration, and ionic strength. The highest RB49 adsorption yield was obtained at an initial pH of 2 and an equilibrium was reached within 20 min using80 mg of adsorbent. The most suitable kinetic model was found as the pseudo-second-order and compatible isotherm was determined as the Langmuir model. The optimum adsorption capacity was found as 119.10 mg g(-1) at 40 degrees C. G degrees, H degrees, and S degrees values were calculated. A positive value of H degrees stated that the adsorption is exothermic and spontaneous. In addition, G degrees showed a more negative value when temperature was increased. Column studies indicated that TDPA-KCl could be effectively used for five cycles without any loss inits desorption potential. Breakthrough studies also supported a favorable adsorption of RB49 onto TDPA-KCl. This study showed that TDPA-KCl is a practical, efficient, and inexpensive adsorbent to remove reactive dyes from wastewater.
  • [ X ]
    Öğe
    Phosphate removal potential of the adsorbent material prepared from thermal decomposition of alunite ore-KCl mixture in environmental cleanup
    (Elsevier B.V., 2010) Tunalı Akar, Sibel; Tosun Satır, İlknur; Özcan, Adnan; Gedikbey, Tevfik
    This study focused on the preparation of a thermal decomposition product of alunite and potassium chloride mixture as an adsorbent for the removal of phosphate ions from aqueous solutions. The adsorbed phosphate ions were quantitatively determined by using ion chromatographic method. The adsorption of phosphate onto adsorbent was strongly dependent on pH and on ionic strength. The optimum pH for the adsorption of phosphate was 3.0. Contact time was 40 min to reach adsorption equilibrium. The equilibrium data fitted well to Langmuir isotherm model. The thermodynamic parameters (?H0, ?S0 and ?G0) of phosphate adsorption at different temperatures calculated from the temperature-dependent adsorption isotherms indicated that the adsorption process was endothermic. The phosphate adsorption was also well applied in continuous system. © 2010 Elsevier B.V. All rights reserved.