Removal of Bi(III) and Zn(II) by nonliving
Streptomyces rimosus biomass from nitric solutions
study reports the Bi3+ and Zn2+ species sorption onto various
adsorbents from nitric synthetic solutions, a typical representative of waste effluents
derived from non valid drugs lixiviate. Solid-liquid batch experiments carried out at
25°C to assess the adsorptive capacity of the sorbents indicate that nonliving
Streptomyces rimosus biomass uptakes the metal species from solutions containing up to
100mg/l, at pH 1.9, at relatively fast kinetics. The biosorbent was loaded with about
7mg/g of Bi3+ and 15mg/g of Zn2+ after 2 hours contact time. Similar
results were obtained with the mineral active carbon and the C25 strong cation exchanger.
It was also found that prior treatment of the biosorbent with dilute solution of NaOH
improved the sorption capacity of Bi3+ to up to 10mg/g. F.T.I.R spectra of the
biomaterial gave bands which were assigned to potential binding groups of the amide I and
amide II types, primary alcohol at C-6 and secondary alcohol at C-3. Characteristic
related peaks were respectively observed at 3272-2950-2923, 1621-1536, 1010 and at 1409cm-1.
When adsorbed, both metal ions were quantitatively eluted and the biosorbent material
regenerated by aqueous solutions of NaCl, 10g/l. Elution of Bi3+ ion was also
obtained with nitric solution of Zn2+, 1g/l.