Removal and recovery of lead(II) from single and multimetal (Cd, Cu, Ni, Zn) solutions by crop milling waste (black gram husk).

The study reports removal of heavy metals when present singly or in binary and ternary systems by the milling agrowaste of Cicer arientinum (chickpea var. black gram) as the biosorbent. The biosorbent removed heavy metal ions efficiently from aqueous solutions with the selectivity order of Pb>Cd>Zn>Cu>Ni.

Bioremoval of cadmium from aqueous solution by black gram husk (Cicer arientinum).

Husk of black gram (Cicer arientinum), a waste of no commercial value, was investigated as a new biosorbent of cadmium from low concentration aqueous solutions. With 99.99% sorption efficiency from 10mg l(-1) cadmium solution, the biomass required at saturation was 0.

Removal of heavy metals from contaminated water by petiolar felt-sheath of palm.

The ability of a reticulated fibrous network of palm petiolar felt-sheath (PPF) to remove toxic metals such as Cd, Cu and Zn from contaminated water was investigated as a new biosorbent system. PPF was found to sequester metal ions efficiently from dilute aqueous solutions with a selectivity order of Cd > Cu > Zn. The extent of adsorption was found to be dependent on pH, metal ion concentration and amount of biosorbent.

Petiolar felt-sheath of palm: a new biosorbent for the removal of heavy metals from contaminated water.

Biosorption of heavy metals such as Pb2+, Ni2+, Cd2+, Cu2+, Cr3+ and Zn2+ by petiolar felt-sheath of palm (PFP) from contaminated water was examined. PFP was found to efficiently remove all the toxic metal ions with selectivity order of Pb2+ > Cd2+ > Cu2+ > Zn2+ > Ni2+ > Cr3+. The uptake was rapid, with more than 70% completed within 15 min.