Volume No. 6 Issue No.: 2 Page No.: 332-343 Oct-Dec 2011

 

ADSORPTION OF REACTIVE BLACK 5 DYES ONTO MODIFIED WHEAT STRAW : ISOTHERM AND KINETICS STUDY

 

Nader Yousefi1, Ali Fatehizadeh2, Mohammad Ahmadian*, Abdolkarim Ahmadi, Ah

1. Department of Environmental Health Engineering, School of Public Health, Tehran University of Medical Sciences, Tehran (IRAN)
2. Department of Environmental Health Engineering, School of Public Health, Esfahan University of Medical Sciences, Esfahan (IRAN)
3. Department of Environmental Health Engineering, School of Public Health, Kerman University of Medical Sciences, Kerman (IRAN)

 

Received on : September 21, 2011

 

ABSTRACT

 

Dye removal onto low cost material is a suitable method for textile wastewater treatment. The aim of this study was application of modified wheat straw as low cost adsorbent for Reactive Black 5 (RB5) removal from textile wastewater at laboratory scale. For modification of wheat straw, Cetylpyridinium Chloride Monohydrate (CPC) at 2.5 mmol/L was used. All experiments were conducted at batch system and effective parameters include pH, adsorbent dose, initial dye concentration and contact time on RB5 adsorption by modified wheat straw was investigated. In addition to, common isotherms and kinetics adsorption were evaluated for determination of optimum adsorption dose and reactions dynamic, respectively. The results showed that with increasing of pH solution from 1 to 7; dye removal efficiency was improved and then was quickly dropped. The minimum and maximum dye removal efficiency was obtained at pH solution 1 and 7 that was 61.54% and 83.15%, respectively. With increasing contact time and adsorption dose, dye removal efficiency increased. Furthermore, when the dye initial concentration increased from 10 to 100 mg/L, dye removal efficiency declined from 100% to 77.97%, respectively. Based on the result, Langmuir isotherm and second order kinetic are best modules for explanation of RB5 adsorption onto modified wheat straw. In regard to cost of other methods in dye removal, modified wheat straw could be suggested as relatively efficient and low cost adsorbent for dye removal from textile wastewater.

 

Keywords : Adsorption, Surfactant, Acidic dye, Textile wastewater, Kinetic

 

 

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