Removal Direct Blue Dye from Aqueous Solution Using Sulfonated Polyacrylamide Polymer (PAM-SO3) As a Novel Adsorbent

Document Type : Original Article

Authors

1 Science and water engineering department, Faculty of agriculture, Bu Ali sina Hamedan

2 Chemistry Department, Islamic Azad University, Marvdasht Branch, Marvdasht, Iran.

Abstract

Entering environmental pollutants into water resources have harmful effects on human health and environment. In recent years, adsorption methods using adsorbents to remove contaminants from water resources have been abundant. Solfounate  and Pentaaza. sulfonated polyacrylamide polymer (PAM-SO3) as a novel adsorbent can be effective for removal of chemical pollutants of the aquatic solution. The purpose of this research is removal of Direct Blue using PAM-SO3 as an adsorbent from polluted water in vitro. The effects of variables such as pH, contact time, initial concentration, adsorbent amount were observed to reach best adsorption conditions. Isotherms of Langmuir, Freundlich and Temkin have been fitted with the data of experiment. In addition, kinetics of pseudo- first order, pseudo- second order, intra-particle diffusion and Elovich were also fitted with the [1]experiment data. Also, the results indicated that the best conditions for removal of Direct Blue dye were: pH= 2, removing time= 45 minutes, adsorbent dosage= 0.014 g and initial concentration of dye= 800 mg L-1. For PAM-SO3, Langmuir isotherms showed a good agreement with the experimental data. Using this model to maximize absorption capacity of 5000 (mg g-1) for PAM-SO3. Absorption rates showed a quick responses which was less than one hours. Based on these results, the adsorption kinetics of pseudo- second- order was more consistent with the experimental data (R2=0.99). The results show that PAM-SO3 absorbent is effective in removing Direct Blue contaminants from the aqueous solutions due to its high surface area and rapid kinetics of the reactions. Therefore, PAM-SO3 is recommended as an efficient adsorbent to remove Direct Blue from aqueous solutions.
 
 

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