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Adsorption of Direct Yellow 9 and Acid Orange 7 From Aqueous Solutions by Modified Pumice



Ahmadian M1 ; Yosefi N2 ; Toolabi A3 ; Khanjani N4 ; Rahimi S5 ; Fatehizadeh A6
Authors
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Authors Affiliations
  1. 1. Social Development and Health Promotion Research Center, Kermanshah University of Medical Sciences, Kermanshah, Iran
  2. 2. Department of Environmental Health Engineering, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran
  3. 3. Department of Environmental Health Engineering, School of Public Health, Kerman University of Medical Sciences, Kerman, Iran
  4. 4. Department of Statistics and Epidemiology, School of Public Health, Kerman University of Medical Sciences, Kerman, Iran
  5. 5. Civil Engineering, Tarbiat Modares University, Tehran, Iran
  6. 6. Environment Research Center, Department of Environmental Health Engineering, Isfahan University of Medical Sciences, Isfahan, Iran

Source: Asian Journal of Chemistry Published:2012

Abstract

Adsorption is widely used for removal of different pollutants from wastewater. In this study, modification of pumice adsorbent by detergents and use of modified pumice for eliminating the direct yellow 9 and acid orange 7, from aqueous solutions was investigated. In this study, cetrimide-C, sodium dodecyl sulfate, cetylpyridinium chloride and hexadecyl trimethyl ammonium bromide detergents were used for modification of pumice. All experiments were performed at batch system. The effect of important parameters on adsorption including adsorbent dosage, dye initial concentration, pH solution and contact time were investigated. The experimental data were compared with the Freundlich, Temkin and Langmuir isotherm models and pseudo first order, pseudo second order and Elovich kinetic models. The results showed that with increasing contact time and adsorbent dosage and decreasing dye initial concentration, dye removal efficiency increased. Also by increasing pH from 1 to 7, dye removal efficiency increased. The maximum direct yellow 9 and acid orange 7 adsorption was obtained at pH 6 and 7, respectively. The maximum adsorption capacity of direct yellow 9 and acid orange 7 was 1.22 and 1.08 mg/g, respectively. The rate constant of direct yellow 9 and acid orange 7 adsorption by modified pumice was 0.014 and 0.007 mg/ g min, respectively. The results of this study revealed that modified pumice adsorbent can be used as a suitable and effective adsorbent for removal of some dyes from coloured wastewater.
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