Isotherm And Kinetics Study For The Adsorption Of Nitrate And Phosphate Ions From Aqueous Solutions Using Fume Dust From Electric Arc Furnace

Document Type

Article

Publication Date

Winter 10-2021

Abstract

The removal of nitrate and phosphate ions from wastewater has a major concern nowadays. Excessive intake of nitrates by humans in drinking water and food can induce methemoglobinemia and stomach cancer. Therefore, it is necessary to remove nitrate and phosphate ions from wastewater. Adsorption using Nano-adsorbents becomes a promising method for phosphate and nitrate removal from wastewater because of their availability, low cost, stability, large surface area to volume ratio and high adsorption capacity. In this research, an industrial waste from El Masryeen Steel factory which is Fume Dust from an Electric Arc Furnace (FD-EAF) is used for simultaneous removal of nitrate and phosphate ions from an aqueous solution. The Maximum nitrate and phosphate ions removal percents 52.74 and 92.38 %, respectively using FD-EAF waste are achieved under these conditions; pH~7, initial nitrate ion concentration = 6 mg/L, initial phosphate ion concentration = 1 mg/L, adsorbent dose = 6.5 g/L and contact time = 90 min. Simultaneous adsorption of nitrate and phosphate ions are well described by pseudo second order kinetic model (R2 = 0.995) with respect to nitrate and (R2 = 0.955) with respect to phosphate as they fit with the experimental results better than the pseudo first order kinetic model (R2= 0.884) with respect to nitrate and (R2=0.868) with respect to phosphate. The rate limiting step is determined using intraparticle diffusion model and Byod plot. Isotherm models are studied for single component and multi-component adsorption systems. For two parameters isotherm model; Langmuir isotherm (R2 = 0.989) fits with the experimental results in case of single phosphate adsorption. In case of single nitrate adsorption from aqueous solutions; Langmuir isotherm (R2 = 0.9957) fits with the experimental results. For three parameters isotherm; Dubinin-Radushkevich isotherm and (R2 = 0.977) and (R2= 0.9849) for single phosphate and single nitrate ion removal from aqueous solutions, respectively fit with the experimental results better than BET isotherm model.

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