6533b82efe1ef96bd1293e75

RESEARCH PRODUCT

Functionalized halloysite nanotubes for enhanced removal of lead(II) ions from aqueous solutions

Salvatore CataldoGiuseppe LazzaraMarina MassaroNicola MuratoreAlberto PettignanoSerena Riela

subject

Halloysite Grafting Lead(II) Adsorption Ionic strengthGeochemistry and PetrologySettore CHIM/01 - Chimica AnaliticaGeologySettore CHIM/06 - Chimica Organica02 engineering and technology010402 general chemistry021001 nanoscience & nanotechnology0210 nano-technology01 natural sciencesSettore CHIM/02 - Chimica Fisica0104 chemical sciences

description

In this study, environmental friendly halloysite nanotubes and their amino derivatives were used as adsorbent materials for lead(II) ions. The adsorption ability of both nanomaterials towards Pb2+ ions has been studied in NaClaq, at I = 0.1 mol L−1, in the pH range 3–6. Moreover, the effect of ionic strength on the adsorption process was evaluated at the pH of maximum efficiency of the adsorbent materials. Kinetic and equilibrium experiments were carried out by using the Differential Pulse Anodic Stripping Voltammetry (DP-ASV) technique to check the metal ion concentration in solution after contact with the two adsorbents. Different isotherm and kinetic equations were used to fit the experimental data. The speciation of metal ion and the characterization of the adsorbents with different techniques were considered in order to establish the suitable experimental conditions for the metal ion removal. The collected data showed that the functionalization of halloysite enhances the adsorption ability of the clay mineral and it makes the nanoclay a good candidate for metal removal from aqueous solutions.

yearjournalcountryeditionlanguage
2018-05-01Applied Clay Science
https://doi.org/10.1016/j.clay.2018.01.028