Title: Optimal removal of iron impurities from kaolin by combination of <i>Aspergillus niger & Bacillus subtilis</i>
Abstract: Abstract This study was carried out to remove iron from kaolin using a biological method by two different species of Bacillus sp . and the combination of A. niger isolated from pistachio skin & Bacillus subtilis and comparing them with the control sample. The experiments were carried out for Bacillus sp . at 30 °C and 25 °C and for the combination of A. niger & Bacillus subtilis at 27 °C. The concentration of dissolved iron increased with increasing temperature in the samples treated with Bacillus sp . X-ray fluorescence spectroscopy results of the samples at 25 °C showed a reduction of 31.1% in Fe 2 O 3 and Fe content and a reduction of 37% at 30 °C after 28 days. Therefore, iron removal by Bacillus subtilis at 30 °C achieves better performance than at 25 °C. X-ray fluorescence spectroscopy results of the samples treated with the combination of A. niger & Bacillus subtilis show a decrease of 49% in Fe 2 O 3 and Fe content at 27 °C after 14 days. The results of colour measurement showed that kaolin powder treated with the combination of A. niger & Bacillus subtilis at 27 °C had the highest degree of whiteness compared to other samples.
Publication Year: 2021
Publication Date: 2021-05-01
Language: en
Type: article
Indexed In: ['crossref']
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