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Efficient Decolorization of Water and Oil-Soluble Azo Dyes by Enterococcus avium Treated with HP-β-CD

Efficient Decolorization of Water and Oil-Soluble Azo Dyes by Enterococcus avium Treated with HP-β-CD

Peng Song1,2, Wei Feng2, Haiying Shi2,Jinsheng Zhao3, Renmin Liu3 and Wei Xu2,*

1Lab of Enzyme and Applied Microbiology, College of Bioengineering, Tianjin University of Science and Technology, Tianjin 300457, China
2School of Life Sciences, Liaocheng University, Liaocheng 252000, China
3College of Chemistry and Chemical Engineering, Liaocheng University, Liaocheng 252000, China

*      Corresponding author: xuwei@lcu.edu.cn

 

ABSTRACT

The industrial effluents containing azo dyes will contaminate the environment without decolorization. Bacterial decolorization generally demonstrates good color removal effects. In this study, the capability of Enterococcus avium to decolorize both water and oil-soluble azo dyes were investigated. The bacteria was incubated under static conditions in the presence of 50mg/L Amaranth or 5 mg/L Sudan I in LB media at 37°C for 10 h, and reduction of the dyes was monitored. The preferable pH for the decolorization of Amaranth by ts17 strain was between pH 6.0-9.0, and with the optimum pH at 7.0. The promotion effect of NaCl on the decoloration of Amaranth up to 5% (w/w) content, and the inhibition action appeared at 7% NaCl. The maximum decolorization concentration of the Amaranth reached 1450mg/L. Mg2+ and Fe3+ could accelerate Amaranth decolorization, and Cu2+, Zn2+, Co2+ showed inhibition of Amaranth decolorization. Compared with the traditional method dissolving oil-soluble dye in DMSO, HP-β-CD was used to monitor the decolorization rate of the sudan I and appropriate molar ratio of HP-β-CD to dye (nC:nS=9:1) effectively improved the decolorization rate from 85.45% to 99.45% after 8 reaction.
 

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Pakistan Journal of Zoology

June

Vol. 51, Iss. 3, Pages 801-1202

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