Two tolerant
bacterial strains isolated from El-Manzala Lake, Egypt and identified using
biochemical tests and confirmed by 16S r RNA gene as Bacillus cereus and Bacillus
subtilis.Then the optimum conditions for biosorption of copper and lead were
investigated by using two bacterial strain, the equilibrium time for copper
were 25 minutes at Bacillus cereusand 30 minutes at Bacillus subtilis while the
equilibrium time for lead were 40 minutes at Bacillus cereusand 50 minutes at
Bacillus subtilis, the optimum pH for copper and lead biosorption at Bacillus
cereus and Bacillus subtilis was pH 6. The experimental biosorption data mostly
were fitted towards the models postulated by Langmuir and Freundlich isotherm
equations. The maximum biosorption capacities (q max) for copper and lead
obtained by usingBacillus cereuswere 47.6 and 250 mg/g while by usingBacillus
subtiliswere 166.7 and 250 mg/g , respectively. Biosorpitve mechanism was
confirmed by IR analysis and from the identification nature of acidic and basic
sites. Moreover, the postulated mechanism was depended mainly on ionic
interaction and complex formation. The results demonstrated that the two
bacterial isolates of Bacillus cereus and Bacillus subtilis could be used as a
promising biosorbents for the removal of copper and lead ions from aqueous
solutions. - See more at:
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