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Degradation of azo dye Acid Orange 7 in water by Fe0/granular activated carbon system in the presence of ultrasound.
J Hazard Mater. 2007 Jun 01; 144(1-2):180-6.JH

Abstract

Degradation of azo dye Acid Orange 7 (AO7) was investigated using zero-valent iron/granular activated carbon (Fe(0)/GAC) in the absence and presence of ultrasound (US). The AO7 degradation efficiency by Fe(0)/GAC was dramatically enhanced by ultrasound, ultrasound alone had a little effect on the degradation. Effects of Fe(0)/GAC ratios and initial pH values on AO7 degradation were studied in the US-Fe(0)/GAC system. The degradation followed the pseudo-first-order kinetics model. The pseudo-first-order rate constant of AO7 degradation by Fe(0)/GAC was 8.74x10(-3)min(-1) while that by US-Fe(0)/GAC was 3.91x10(-2)min(-1). A significant synergetic effect was observed between US and Fe(0)/GAC. Ultrasound swept the reactive intermediates or products from Fe(0) surface, and thereby the surface of Fe(0) was cleaned and reactivated. Granular activated carbon was added as cathode to increase the unit of internal batteries and enhance the current efficiency of the internal electrolysis. The suitable Fe(0)/GAC ratio (v/v) for the degradation of AO7 in the presence of ultrasound was 1:1. The degradation was highly dependent on pH, and a decrease of the initial pH values from 12.0 to 4.0 led to the increase of degradation efficiencies. Sulfanilamide was proved as the main residual degradation product in the solution by the analysis of high-performance liquid chromatograms.

Authors+Show Affiliations

State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, PO Box 2871, Beijing 100085, China.No affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

17125919

Citation

Liu, Haining, et al. "Degradation of Azo Dye Acid Orange 7 in Water By Fe0/granular Activated Carbon System in the Presence of Ultrasound." Journal of Hazardous Materials, vol. 144, no. 1-2, 2007, pp. 180-6.
Liu H, Li G, Qu J, et al. Degradation of azo dye Acid Orange 7 in water by Fe0/granular activated carbon system in the presence of ultrasound. J Hazard Mater. 2007;144(1-2):180-6.
Liu, H., Li, G., Qu, J., & Liu, H. (2007). Degradation of azo dye Acid Orange 7 in water by Fe0/granular activated carbon system in the presence of ultrasound. Journal of Hazardous Materials, 144(1-2), 180-6.
Liu H, et al. Degradation of Azo Dye Acid Orange 7 in Water By Fe0/granular Activated Carbon System in the Presence of Ultrasound. J Hazard Mater. 2007 Jun 1;144(1-2):180-6. PubMed PMID: 17125919.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Degradation of azo dye Acid Orange 7 in water by Fe0/granular activated carbon system in the presence of ultrasound. AU - Liu,Haining, AU - Li,Guoting, AU - Qu,Jiuhui, AU - Liu,Huijuan, Y1 - 2006/10/12/ PY - 2006/04/20/received PY - 2006/09/30/revised PY - 2006/10/03/accepted PY - 2006/11/28/pubmed PY - 2007/8/31/medline PY - 2006/11/28/entrez SP - 180 EP - 6 JF - Journal of hazardous materials JO - J Hazard Mater VL - 144 IS - 1-2 N2 - Degradation of azo dye Acid Orange 7 (AO7) was investigated using zero-valent iron/granular activated carbon (Fe(0)/GAC) in the absence and presence of ultrasound (US). The AO7 degradation efficiency by Fe(0)/GAC was dramatically enhanced by ultrasound, ultrasound alone had a little effect on the degradation. Effects of Fe(0)/GAC ratios and initial pH values on AO7 degradation were studied in the US-Fe(0)/GAC system. The degradation followed the pseudo-first-order kinetics model. The pseudo-first-order rate constant of AO7 degradation by Fe(0)/GAC was 8.74x10(-3)min(-1) while that by US-Fe(0)/GAC was 3.91x10(-2)min(-1). A significant synergetic effect was observed between US and Fe(0)/GAC. Ultrasound swept the reactive intermediates or products from Fe(0) surface, and thereby the surface of Fe(0) was cleaned and reactivated. Granular activated carbon was added as cathode to increase the unit of internal batteries and enhance the current efficiency of the internal electrolysis. The suitable Fe(0)/GAC ratio (v/v) for the degradation of AO7 in the presence of ultrasound was 1:1. The degradation was highly dependent on pH, and a decrease of the initial pH values from 12.0 to 4.0 led to the increase of degradation efficiencies. Sulfanilamide was proved as the main residual degradation product in the solution by the analysis of high-performance liquid chromatograms. SN - 0304-3894 UR - https://www.unboundmedicine.com/medline/citation/17125919/Degradation_of_azo_dye_Acid_Orange_7_in_water_by_Fe0/granular_activated_carbon_system_in_the_presence_of_ultrasound_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0304-3894(06)01201-5 DB - PRIME DP - Unbound Medicine ER -