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Effect of NTA and pH on Lead(II) Adsorption by the Hydrous Oxides of Mn, Fe, and A1

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Title: Effect of NTA and pH on Lead(II) Adsorption by the Hydrous Oxides of Mn, Fe, and A1 Authors: Abraham, Beena T; Anirudhan, T S Abstract: 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 NaNO3, NTA and Pb-NTA has been determined. In the presence of NTA the values of zero point charge (pHzpc) 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. The pHzpc values for AlOOH, FeOOH and MnOOH in the presence of Pb and NTA were found to be 7.3, 6.0, and 3.2 respectively. An empirical relationship has been obtained to predict the pHzpc at any amount of NTA adsorption on AlOOH. The adsorption characteristics of Pb and NTA in presence of each other has been studied. The adsorption of Pb(II) in presence of NTA was greater than NTA adsorption in presence of Pb(II). The maximum adsorption of Pb (II) in presence of NTA occur at a pH range of 3.0-4.0. The oxide surface carries a net positive charge at pH range 3.0-4.0 thus negatively charged Pb-NTA2- complex can be readily adsorbed. Page(s): 145-150

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