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Effectiveness of Moringa Oleifera Powder in Removal of Heavy Metals From Aqueous Solutions



Farrokhzadeh H1 ; Taheri E1, 2 ; Ebrahimi A1 ; Fatehizadeh A1, 2 ; Dastjerdi MV1 ; Bina B1
Authors
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Authors Affiliations
  1. 1. Environment Research Center, Isfahan University of Medical Sciences (IUMS), Isfahan, Iran
  2. 2. Department of Environmental Health Engineering, School of Health, Stud. Research Center, Isfahan, Iran

Source: Fresenius Environmental Bulletin Published:2013

Abstract

Moringa oleifera (MO) was used as a potential adsorbent for Mn 2+, Ni2+, Cr2+, Cu2+, Fe 2+ and Zn2+ removal from aqueous solutions. Effective parameters such as pH solution, MO particle size, adsorbent dose and initial metals concentrations were studied. The Minitab 15 software was used to experiment design. The adsorption parameters were determined using Freundlich, Langmuir and Temkin isotherms. The optimum pH for heavy metal removal was 7 and the percentage of heavy metal removal at equilibrium increases with increasing the MO dose and by descending the MO particle size. Increasing the initial metal concentration led to an increase in the metal uptake per unit weight of the MO. The adsorption data obtained were well described by the Langmuir isotherm model for Zn2+ adsorption, Freundlich isotherm model for Cr3+ adsorption and Temkin isotherm for Fe2+, Cu2+ and Mn 2+ adsorption. The maximum adsorption capacity was found to be 2.09 mg/g for Zn2+ and 109.62 for Cr3+ and constant related to heat of adsorption for Fe2+, Cu2+ and Mn2+ was 2.09, 24.98 and 17.35 mg/L, respectively. According to the findings, MO is a relatively efficient biosorbent for heavy metal removal from aqueous solution. © by PSP.
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