Sulfate Removal from Water Using Activated Red Mud: Kinetic, Isotherm and Thermodynamic Studies

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Arhami Dolat Alireza; GANJIDOUST HOSSEIN

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Journal: Amirkabir Journal of Civil Engineering Year:621 | Volume: | Issue: Page(s): 439-456

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Information Journal Paper

Title

Sulfate Removal from Water Using Activated Red Mud: Kinetic, Isotherm and Thermodynamic Studies

Author(s)

Arhami Dolat Alireza | GANJIDOUST HOSSEIN | Issue Writer Certificate

Keywords

Adsorption

Red mud

Activated red mud

Sulfate

Thermodynamics

Abstract

In this study, absorption of Sulfates on activated aluminum industry waste (Red mud) has been investigated in a batch system by OFAT method. The properties of the absorbents were analyzed using scanning electron microscope (SEM), BET surface area, X-ray diffraction (XRD), XRF. The process of Sulfate absorption was done in a volume of 200 mL and a mixer speed of 150 rpm. The optimum Adsorption conditions were derived for in an equilibrium time of 90 minutes, the initial concentration of 100 ppm, pH=4, the temperature of 65 ◦, C and 1. 5 g/L dose of the absorbent. The efficiency of Sulfate removal was 73. 1 percent at the optimum conditions. Thermodynamic analysis of absorption showed that the absorption process at all analyzed temperatures had occurred spontaneously. Sulfate Adsorption kinetics on composite surfaces followed a pseudo second order equation and absorption isotherm had a high conformity with Langmuir, Dobinin-Radoshkovich and Temkin isotherms respectively and the maximum absorption capacity of it according to Langmuir isotherm is 13. 07 mg of Sulfate per gram of the absorbent.

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