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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

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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