MECHANISM AND REMOVAL EFFICIENCY OF C.I. ACID BLAKE 1 BY PUMICE STONE ADSORBENT

Backgrounds and Objectives: Treatment of colored wastewater is one of the important challenges of environmental engineers. Adsorption process is a key option for removal of organic matter from wastewater. The aim of present work was to investigate pumice stone as an adsorbent for removal of Acid Black 1 from aqueous solution. Materials and Methods: Removal of Acid Black 1 by pumice stone was investigated. Acid HyrdoChloric(HCL) 1 N was used to increse adsorbent porosity. Various parameters such as pH, initial dye concentration and contact time were studied. Results: Results showed that removal of Acid Black 1 was increased by increasing of contact time and initial dyeconcentration although it was decreased by increasing of pH. Experimental data was best fitted to Longmuir isotherm model (r>0.98). Study of diffusion model revealed that intraparticle diffusion is rate-controlling step in removal of Acid Black 1 by pumice stone. Conclusion: The results indicated that pumice stone was a dominant adsorbent for Acid Black 1 removal.

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