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A Study of Cr(Vi) and Nh4+Adsorption Using Greensand (Glauconite) As a Low-Cost Adsorbent From Aqueous Solutions Publisher



Naghipour D1 ; Taghavi K1 ; Ashournia M2 ; Jaafari J1, 3 ; Arjmand Movarrekh R1
Authors
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Authors Affiliations
  1. 1. School of Health, Guilan University of Medical Sciences, Rasht, Iran
  2. 2. Guilan Branch of the Academic Center for Education, Culture and Research, Rasht, Iran
  3. 3. School of Public Health, Department of Environmental Health Engineering, Tehran University of Medical Sciences, Tehran, Iran

Source: Water and Environment Journal Published:2020


Abstract

This paper investigates the removal of Cr(VI) and NH4+ from aqueous solutions using greensand (glauconite). The effects of adsorbent dosage, contact time, initial Cr(VI) and NH4+ concentrations, and pH were investigated in batch experiments. The results show that these parameters influenced Cr(VI) and NH4+ removal using glauconite considerably. Pseudo-first-order, pseudo-second-order and intraparticle diffusion kinetic models were applied to explain the kinetic data, and the pseudo-second-order model achieved good agreement. The equilibrium isotherm data are coordinated with the Freundlich, Langmuir models, Temkin and Dubinin–Radushkevich; the Freundlich model proved most best suitable. The removal efficiency of Cr(VI) and NH4 + were 12.21 mg/g (54% at pH 3) and 19.24 mg/g (77.08% at pH 7). All in all, the results showed that the adsorption process on glauconite could be used as an effective method for removing Cr(VI) and NH4+ from aqueous solutions. © 2018 CIWEM
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