The removal by crab shell of mixed heavy metal ions in aqueous solution

In order to examine the inhibition effect of other heavy metal ions on the removal by crab shell of heavy metal ions in aqueous solutions, three ions (Pb2+, Cd2+, Cr3+) were used in single, binary and ternary systems. In single heavy metal ion systems, the removals of Cr3+ and Pb2+ were much higher than that of Cd2+. In binary heavy metal ions systems, Cd2+ did not affect Pb2+ removal while Cr3+ had a severe inhibition effect on the removal of Pb2+. Cd2+ removal was slightly affected by the presence of Pb2+; however, it was severely affected by the presence of Cr3+. The inhibitory effect of Cd2+ on Cr3+ was relatively lower than that of Pb2+.