Bioleaching of kaolin with Bacillus cereus: effects of bacteria source and concentration on iron removal

Cheah Wan Qi, . and Yong Shih Nee, . and Chieng Sylvia, . and Kuan Seng How, . and Yap Hao Jun, . Bioleaching of kaolin with Bacillus cereus: effects of bacteria source and concentration on iron removal. pp. 91-99. ISSN 2672-7226

The presence of iron impurities in kaolin can negatively affect its whiteness index and refractory properties. Bacteria of the Bacillus species have been found to be effective in removing ferric ions Fe(III) from kaolin. This work examines the bioleaching of Fe (III) from kaolin using B. cereus. Two strains were tested: the first procured from an external laboratory and the second isolated from a kaolin sample. Bioleaching experiments were conducted at 30C for five days. Changes in surface morphology of the kaolin were investigated using scanning electron microscopy while chemical composition was analysed using energy dispersion X-ray spectroscopy. Dissolved Fe (II) concentration in kaolin leachates was measured spectrophotometrically using the phenanthroline method. Evident changes in the surface morphology of kaolin samples were observed in the presence of bacteria. Results also revealed higher Fe removal by indigenous B. Cereus strain UKMTAR-4 isolated from kaolin (53.9 ) compared to B. cereus procured externally (33.9). When concentration of bacteria was progressively increased and bioleaching time extended to 10 days presence of dissolved Fe (II) increased indicating augmented bioleaching activity with increase of bacteria count.

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Abstract

The presence of iron impurities in kaolin can negatively affect its whiteness index and refractory properties. Bacteria of the Bacillus species have been found to be effective in removing ferric ions Fe(III) from kaolin. This work examines the bioleaching of Fe (III) from kaolin using B. cereus. Two strains were tested: the first procured from an external laboratory and the second isolated from a kaolin sample. Bioleaching experiments were conducted at 30C for five days. Changes in surface morphology of the kaolin were investigated using scanning electron microscopy while chemical composition was analysed using energy dispersion X-ray spectroscopy. Dissolved Fe (II) concentration in kaolin leachates was measured spectrophotometrically using the phenanthroline method. Evident changes in the surface morphology of kaolin samples were observed in the presence of bacteria. Results also revealed higher Fe removal by indigenous B. Cereus strain UKMTAR-4 isolated from kaolin (53.9 ) compared to B. cereus procured externally (33.9). When concentration of bacteria was progressively increased and bioleaching time extended to 10 days presence of dissolved Fe (II) increased indicating augmented bioleaching activity with increase of bacteria count.

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Item Type:	Article
AGROVOC Term:	Kaolinite
AGROVOC Term:	Clay minerals
AGROVOC Term:	Bleaching
AGROVOC Term:	Scanning microscopy
AGROVOC Term:	Bacteria
AGROVOC Term:	Bacillus cereus
AGROVOC Term:	Iron
Depositing User:	Mr. AFANDI ABDUL MALEK
Last Modified:	24 Apr 2025 00:54
URI:	http://webagris.upm.edu.my/id/eprint/9207

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