Preloading hydrous ferric oxide into granular activated carbon for arsenic removal

Min Jang, Weifang Chen, Fred Scott Cannon

Research output: Contribution to journalArticle

126 Citations (Scopus)

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 °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 °C, the procedure successfully created HFO in the pores of GAC, whereas at temperatures of 80 and 90 °C, the impregnated iron oxide manifested a more crystalline form. In the column tests using synthetic water, the HFO-loaded GAC prepared at 60 °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/μg/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.

Original languageEnglish (US)
Pages (from-to)3369-3374
Number of pages6
JournalEnvironmental Science and Technology
Volume42
Issue number9
DOIs
StatePublished - May 1 2008

Fingerprint

preloading
Arsenic
Activated carbon
activated carbon
arsenic
oxide
Oxides
Iron oxides
iron oxide
Sorption
sorption
Iron
iron
Temperature
Water treatment plants
temperature
removal
ferric oxide
Water treatment
Impregnation

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Environmental Chemistry

Cite this

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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 °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 °C, the procedure successfully created HFO in the pores of GAC, whereas at temperatures of 80 and 90 °C, the impregnated iron oxide manifested a more crystalline form. In the column tests using synthetic water, the HFO-loaded GAC prepared at 60 °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/μg/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.",
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Preloading hydrous ferric oxide into granular activated carbon for arsenic removal. / Jang, Min; Chen, Weifang; Cannon, Fred Scott.

In: Environmental Science and Technology, Vol. 42, No. 9, 01.05.2008, p. 3369-3374.

Research output: Contribution to journalArticle

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