Preloading Hydrous Ferric Oxide into Granular Activated Carbon for Arsenic Removal

Abstract

Arsenic is of concern in water treatment because of its health effects. This research focused on incorporating hydrous ferric oxide (HFO) into granular activated carbon (GAC) for the purpose of arsenic removal. Iron was incorporated into GAC via incipient wetness impregnation and cured at temperatures ranging from 60 to 90 degrees C. X-ray diffractions and arsenic sorption as a function of pH were conducted to investigate the effect of temperature on final iron oxide (hydroxide) and their arsenic removal capabilities. Results revealed that when curing at 60 degrees C, the procedure successfully created HFO in the pores of GAC, whereas at temperatures of 80 and 90 degrees C, the impregnated iron oxide manifested a more crystalline form. In the column tests using synthetic water, the HFO-loaded GAC prepared at 60 degrees C also showed higher sorption capacities than media cured at higher temperatures. These results indicated that the adsorption capacity for arsenic was closely related to the form of iron (hydr)oxide for a given iron content For the column test using a natural groundwater, HFO-loaded GAC (Fe, 11.7%) showed an arsenic sorption capacity of 26 mg As/g when the influent contained 300 microg/L As. Thus, the preloading of HFO into a stable GAC media offered the opportunity to employ fixed carbon bed reactors in water treatment plants or point-of-use filters for arsenic removal.

Characterization of ZrO2 Nano Particles Prepared by Glycothermal Method and their Efficiency as Adsorbent of As(III) and As(V) from Waste Water

“…Zirconium dioxide nano particles were prepared by glycothermal method as follow [20]: 15.3 g of ZrOCl 2 ·8H 2 O was dissolved in one liter of water then slowly NaOH (0.05 Molar) was added with rapid stirring, till the pH of solutions became 9. The precipitated ZrO 2 was decanted and washed by using ethanol for five times.…”

Enhanced Removal of COD and Color in Paper-making Wastewater by Ozonation Catalyzed by Fe Supported on Activated Carbon

“…2 that, compared to the X-ray powder diffraction pattern of AC, a newly emerged broad diffraction peak at 35.9°and a relatively smaller peak at 61.4° in Fe@AC demonstrated that the Fe element was present in AC in the form of 2-line ferrihydrite (JCPDS,. The other main crystallized peaks corresponded to the SiO2 contained in this AC (Jang et al 2008).…”

Nexus between polymer support and metal oxide nanoparticles in hybrid nanosorbent materials (HNMs) for sorption/desorption of target ligands

“…As expected, many attempts have previously been made to dope HFO and HZrO nanoparticles onto different kinds of substrates, namely, activated carbon, alginate, chitosan, zeolite and cation exchange resins [12][13][14][15][16]. However, these support materials only improved mechanical strength and hydraulic permeability for applications in fixed-bed columns.…”