Study on isotherm and kinetic for the adsorption of heavy metal Zinc from aqueous solution by Scenedesmus micro-algae

Subject Areas : Environmental pollutions (water, soil and air)

Mona Zelli Booriabadi ¹ (MSc of Aquatic Ecology, Faculty of Fisheries and Environment, Gorgan University of Agricultural Sciences and Natural Resources *(Corresponding Author).)
Seyed Abbas Hoseini ² (Professor of Aquatic Ecology, Faculty of Fisheries and Environment, Gorgan University of Agricultural Sciences and Natural Resources)
Seyed Aliakbar Hedayati ³ (Associate Professor of Aquatic Ecology, Faculty of Fisheries and Environment, Gorgan University of Agricultural Sciences and Natural Resources)
Afshin Adeli ⁴ (Assistant Professor of Fisheries, Faculty of Fisheries and Environment, Gorgan University of Agricultural Sciences and Natural Resources)
Hassan Rezaei ⁵ (Assistant Professor of Environment, Faculty of Fisheries and Environment, Gorgan University of Agricultural Sciences and Natural Resources)

Received: 2017-06-01 Accepted : 2017-08-30 Published : 2020-11-21

Keywords: algae Scenedesus, heavy metal zinc, Isotherms, sorption kinetics,

Abstract :

Background: Zinc is an abundant element in the Earth's crust at approximately 0.04 grams to kilograms. The Zinc sulfide is found mostly in nature. The deposition of Zinc absorption by the amount of soluble in aqueous solutions decreases. In this study, the removal of Zinc was investigated by Scenedesmus algae. Methods: To determine the amount of Zinc absorbed by the absorbent Scenedesmus concentrations of pollutants under different conditions, adsorbent dose, contact time, pH back and the remaining amount was measured by atomic absorption. Adsorption isotherms and kinetic modeling of metal ions on the adsorbent based on the model of Langmuir, Freundlich and kinetics were determined pseudo-first and pseudo-second. Results: absorption and adsorption kinetics by Langmuir and Freundlich isotherm models by the model described by pseudo first order and pseudo-second. The results showed that the correlation coefficient, absorption kinetics of pseudo-second-order model with an amount equal to 1 and the balance by the amount of 0.7926 were described by Freundlich isotherm. Conclusion: This study showed absorption process due to the high correlation algae Scenedesmus sp feature is the removal of Zinc And can be to used proposed as appropriate for the removal of the wastewater.

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