A Comparison Study of Granular Activated Carbon Modification by Fecl 3 Under the Acidic and Basic Condition for Arsenic Removal From Water Publisher



Mahdavi M^{1, 2} ; Mahvi AH³ ; Fatehizadeh A⁴ ; Sadani M⁵ ; Shahmoradi B⁶ ; Ebrahimi A^{4, 7}
Source: Desalination and Water Treatment Published:2019

Abstract

The present study deals with the effect of two different conditions for modification of raw granular activated carbon (GAC) with FeCl 3 under acidic granular activated carbon (AGAC) and basic granular activated carbon (BGAC) conditions for removal of arsenic – As(V) – from aqueous solution. X-ray diffraction, scanning electron microscopy, and Brunauer–Emmett–Teller (BET) were used for structural properties. Obtained images show that for raw GAC most of the peaks are related to SiO 2 and graphite, but, for AGAC related to Fe 2 O 3 , Fe 3 O 4 , and SiO 2 , and for BGAC related to Fe 3 O 4 and hydrogen aluminum silicate. Surface area and total pore volume of raw GAC > AGAC > BGAC. Kinetics study for arsenic removal by raw GAC and BGAC obeyed pseudo-first-order model, but, AGAC obeyed pseudo-second-order model. Isotherm study showed that raw GAC has a good fit with Langmuir model, and AGAC and BGAC have a good fit with Freundlich model. The adsorption capacity of AGAC, BGAC, and raw GAC (As(V) concentration = 0.3 mg/L) was 22.7, 18.33, and 14.35 mg/g, respectively. It was concluded that modified raw GAC under the acidic condition had better than basic condition. © 2019 Desalination Publications. All rights reserved.