Functionalized biogenic hydroxyapatite with 5-aminosalicylic acid – Sorbent for efficient separation of Pb2+ and Cu2+ ions. Issue 4 (August 2017)

• Record Type: Journal Article
• Authors: Smičiklas, Ivana; Papan, Jelena; Lazić, Vesna; Lončarević, Davor; Ahrenkiel, S. Phillip; Nedeljković, Jovan M.
• Is Part Of: Journal of environmental chemical engineering. Volume 5:Issue 4(2017:Dec.)
• Page Start: 3759
• Page End: 3765
• Publication Date: 2017-08
• Subjects: HAP -- 5-Aminosalicylic acid -- Charge-transfer complex -- Sorption -- Heavy metal ions; Chemical engineering -- Environmental aspects -- Periodicals; Environmental engineering -- Periodicals; Chemical engineering -- Environmental aspects; Environmental engineering; Periodicals; 660.0286
• DOI: 10.1016/j.jece.2017.07.027
• Languages: English
• ISSNs: 2213-2929

Abstract

Highlights: Biogenic hydroxyapatite (BHAP) is modified with 5-aminosalicylic acid (5-ASA). Coloration of BHAP powder is indication of its successful modification with 5-ASA. Both, neat and modified BHAP, are high capacity sorbents for Pb 2+ and Cu 2+ ions. Modified BHAP has enhanced Pb 2+ sorption capacity compared to unmodified one. Modified BHAP exhibits selective removal of Pb 2+ ions from bi-component solutions. Abstract: The biogenic hydroxyapatite (BHAP), obtained by proper treatment of bovine bones, was functionalized with 5-aminosalicylic acid (5-ASA). The coordination of 5-ASA to the surface of BHAP leads to the charge transfer (CT) complex formation accompanied with absorption in visible spectral range. The sorption ability of surface-modified BHAP with 5-ASA (5-ASA/BHAP) for removal of Pb 2+ and Cu 2+ ions from single- and bi-component solutions was compared with unmodified BHAP. The thorough characterization of both sorbents, BHAP and 5-ASA/BHAP, was performed including X-ray diffraction analysis (XRD), transmission electron microscopy (TEM), nitrogen adsorption-desorption isotherms, as well as diffuse reflection spectroscopy. Sorption kinetics and equilibriums for both ions (Pb 2+ and Cu 2+ ) by as-prepared BHAP and 5-ASA/BHAP are quite different. Functionalized sorbent demonstrated faster sorption kinetic and higher maximum sorption capacity for Pb 2+ ions from bi-component solutions. From equimolar Pb 2+ and Cu 2+ mixture with a total concentration of 10 −2 mol/L, 66% of Pb 2+ was recovered using BHAP, while 97% using 5-ASA/BHAP. These preliminary data indicate potential applicability of properly functionalized hydroxyapatite for selective removal of heavy metal ions from contaminated water.