title: Enhanced biodecolorization of azo dyes by anthraquinone-2-sulfonate immobilized covalently in polyurethane foam.
abstract: The effect of anthraquinone-2-sulfonate covalently immobilized in PUF (AQS-PUF) on the decolorization of azo dyes by Escherichia coli K12 was investigated. The results showed that AQS-PUF mediated biodecolorization rate of azo dye amaranth increased over 5-fold compared with that lacking AQS, and the kinetics of its biodecolorization could be described using Quiroga second order equation. During the above process, a lot of the cells of E. coli K12 were attached in the walls of AQS-PUF pores. After 10 repeated experiments using AQS-PUF, immobilized AQS-mediated biodecolorization efficiency of amaranth retained over 98.7% of their original value. Moreover, AQS-PUF could greatly enhance the decolorization rates of a broad range of azo dyes. These results indicated that AQS-PUF as a biocarrier exhibited high catalytic activity and good stability for potential applications.
authors.affiliation: Key Laboratory of Industrial Ecology and Environmental Engineering (Ministry of Education), School of Environmental and Biological Science and Technology, Dalian University of Technology, Dalian 116024, China.
authors.forename: Hong
authors.initials: H
authors.lastname: Lu
authors.forename: Jiti
authors.initials: J
authors.lastname: Zhou
authors.forename: Jing
authors.initials: J
authors.lastname: Wang
authors.forename: Weilei
authors.initials: W
authors.lastname: Si
authors.forename: Hu
authors.initials: H
authors.lastname: Teng
authors.forename: Guangfei
authors.initials: G
authors.lastname: Liu
mesh_terms: D000327:Adsorption; D000880:Anthraquinones / Q000737:chemistry*; D001391:Azo Compounds / Q000737:chemistry / Q000378:metabolism*; D001673:Biodegradation, Environmental; D003116:Color; D004396:Coloring Agents / Q000737:chemistry / Q000378:metabolism*; D048168:Escherichia coli K12 / Q000378:metabolism*; D005740:Gases / Q000737:chemistry; D011140:Polyurethanes / Q000737:chemistry*
chemical_list: D000880:Anthraquinones; D001391:Azo Compounds; D004396:Coloring Agents; D005740:Gases; D011140:Polyurethanes; C023554:anthraquinone sulfonate