Effect of NTA and pH on Lead(II) Adsorption by the Hydrous Oxides of Mn, Fe, and Al

摘要

The object of this work was to study the influence of nitrilotriacetic acid (NTA) on Pb(II) adsorption by different hydrous oxide gels (MnOOH, FeOOH and AlOOH) at different pH levels. The surface charge density as a function of pH in aqueous solution of NaNO_3, NTA and Pb-NTA has been determined. In the presence of NTA the values of zero point charge (pH_zpc) for ALOOH, FeOOH and MnOOH were shifted downwards from 9.2 to 8.5, 7.3 to 6.5 and 3.8 to 3.6 respectively.