Preloading hydrous ferric oxide into granular activated carbon for arsenic removal

Jang, M. and Chen, W. and Cannon, F.S. (2008) Preloading hydrous ferric oxide into granular activated carbon for arsenic removal. Environmental Science and Technology, 42 (9). pp. 3369-3374. ISSN 0013936X, DOI https://doi.org/10.1021/es7025399.

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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. © 2008 American Chemical Society.

Item Type:	Article
Funders:	UNSPECIFIED
Additional Information:	Cited By (since 1996):57 Export Date: 16 December 2013 Source: Scopus CODEN: ESTHA PubMed ID: 18522120 Language of Original Document: English Correspondence Address: Chen, W.; Department of Civil and Environmental Engineering, Pennsylvania State University, University Park, PA 16802, United States; email: wzc102@psu.edu Chemicals/CAS: activated carbon, 64365-11-3, 82228-96-4; arsenic, 7440-38-2; ferric oxide, 1309-37-1, 56449-54-8; hydroxide, 14280-30-9; iron, 14093-02-8, 53858-86-9, 7439-89-6; iron oxide, 1332-37-2; water, 7732-18-5; carbon, 7440-44-0; charcoal, 16291-96-6; ferric hydroxide, 11113-66-9, 12022-37-6, 12181-28-1, 1309-33-7, 1310-14-1, 1317-60-8, 1317-63-1; ferric ion, 20074-52-6; Arsenic, 7440-38-2; Carbon, 7440-44-0; Charcoal, 16291-96-6; Ferric Compounds; ferric hydroxide, 1309-33-7; ferric oxide, 1309-37-1; Water, 7732-18-5 References: Chris, L.X., Yalcin, S., Mingsheng, M., Speciation of submicro-gram per liter levels of arsenic in water: On-site species separation integrated with sample collection (2000) Environ. 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Uncontrolled Keywords:	Adsorption capacities, Arsenic removals, Arsenic sorptions, Bed reactors, Column tests, Crystalline forms, Effect of temperatures, Fixed carbons, Granular activated carbons, Health effects, Higher temperatures, Hydrous ferric oxides, Incipient wetness impregnations, Iron contents, Natural groundwaters, Point-of-use filters, Pre loadings, Sorption capacities, Synthetic waters, X- ray diffractions, Activated carbon, Activated carbon treatment, Adsorption, Arsenic, Charcoal, Curing, Granular materials, Groundwater, Hafnium compounds, Hydrogeology, Iron oxides, Nonmetals, pH effects, Thermal effects, Chemicals removal (water treatment), ferric oxide, ground water, hydroxide, iron, iron oxide, water, carbon, ferric hydroxide, ferric ion, health impact, pH, pollutant removal, temperature effect, water treatment, article, chemical analysis, column chromatography, crystal structure, high temperature, waste component removal, X ray diffraction, chemistry, crystallization, isolation and purification, materials testing, methodology, temperature, water management, water supply, Ferric Compounds, Hydrogen-Ion Concentration, Water Purification, X-Ray Diffraction
Subjects:	T Technology > TA Engineering (General). Civil engineering (General)
Divisions:	Faculty of Engineering
Depositing User:	Mr Jenal S
Date Deposited:	04 Feb 2014 03:34
Last Modified:	04 Feb 2014 03:34
URI:	http://eprints.um.edu.my/id/eprint/9195

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