Notice of RetractionProduction and Characteristics of Bioflocculant from Azotobacter

Notice of Retraction

After careful and considered review of the content of this paper by a duly constituted expert committee, this paper has been found to be in violation of IEEE´s Publication Principles.

We hereby retract the content of this paper. Reasonable effort should be made to remove all past references to this paper.

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Bioflocculant JMBF-25 produced by Azotobacter was studied emphasizing on bioflocculant production and flocculating characteristics. Under optimized culture condition (10g glycerol, 10g yeast extract, 1g KH₂PO₄, 0.5g MgSO₄-7H₂O, 1L tap water, pH 7.5, culture temperature 34 °C ), a high flocculant productivity of 1.6g/L was obtained. The effects of reagent dosage, initial pH and dynamics on flocculating activity were investigated. The bioflocculant was found to be effective for defecating kaolin suspension under both acidic and alkaline circumstances; with 0.08mg/L dosage the highest flocculating activity 96.8% was achieved, while excessive bioflocculation led to reverse effect. Combined with chemical analysis and spectrum scanning, the bioflocculant was proved to be polysaccharides with molecular weight 3.22×10⁶Da, containing carboxyl and hydroxyl groups. From the flocculating behavior and chemical features of the bioflocculant JMBF-25, it was concluded that the flocculating process mainly depended on hydrogen bond and Van der waals´s force, followed by bridging and network capturing.