Removal of Malachite Green Dye From Aqueous Solutions Using Zeolitic Imidazole Framework-8 Publisher



Khoshnamvand N^{1, 2} ; Jafari A¹ ; Kamarehie B¹ ; Mohammadi A³ ; Faraji M^{4, 5}
Source: Environmental Processes Published:2019

Abstract

Adsorption of malachite green (MG) using zeolitic imidazole framework-8 (ZIF-8) as a novel adsorbent was investigated in the current study. The effect of pH (3 to 11), contact time (15 to 120 min), ZIF-8 dosage (0.01 to 0.09 g/L), and competitive compounds (NaCl and NH4Cl) was studied on the adsorption of MG (25 to 200 mg/L) alongside the sonocatalyst process at 30 kHz for 60 min. Moreover, isotherm and kinetic models were investigated. Optimum conditions were obtained at pH=7, catalyst dosage=0.05 g/L, MG concentration=25 mg/L and contact time=90 min, with a removal efficiency of MG up to 95%. Experimental data were well fitted on the Freundlich and pseudo-second order model. Maximum adsorption capacity was found to be 224.14 mg/g. The effect of competitive compounds was insignificant. This study demonstrated that the sonocatalyst process in combination with ZIF-8 is a promising and efficient method for adsorption of MG from aqueous solutions. © 2019, Springer Nature Switzerland AG.