Sorption characteristics of lead cations on microporous organo-birnessite

• Published in: Applied clay science Vol. 83-84; pp. 263 - 269
• Main Authors: Lee, Chae-Young, Kim, Taesung, Komarneni, Sridhar, Han, Sun-Kee, Cho, Yunchul
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier B.V 01-10-2013; Elsevier
• Subjects: Earth sciences; Earth, ocean, space; Exact sciences and technology; Groundwater remediation; Hybrid organic–inorganic sorbent; Lead; Manganese oxide; Mineralogy; Silicates; Water purification; Lead; Groundwater remediation; Hybrid organic–inorganic sorbent; Water purification; Manganese oxide; Fourier transformation; oxides; heavy metals; X-ray diffraction; ground water; X-ray spectroscopy; specific surface; sorption; remediation; aquifers; carbon; purification; manganese oxides; transmission electron microscopy; energy; infrared spectroscopy; adsorption; cations; oxidation; isotherms; lead; Hybrid organic-inorganic sorbent; birnessite
• ISSN: 0169-1317; 1872-9053
• DOI: 10.1016/j.clay.2013.08.035

The aim of this study was to examine the adsorption characteristics of cationic surfactant modified-birnessite for removal of Pb. For this purpose, Na-birnessite and tetramethylammonium (TMA) cation were used as an inorganic host and cationic surfactant, respectively. Na-birnessite was synthesized by the oxidation of Mn2+ under alkaline condition, and TMA cation was intercalated in the interlayer of H-birnessite prepared from Na-birnessite.
Batch isotherm tests were carried out to investigate the adsorption capacity of the TMA-birnessite for Pb. The characterization of all synthetic birnessites was carried out with powder X-ray diffraction (XRD), energy-dispersive X-ray spectroscopy (EDS), transmission electron microscopy (TEM), and Brunauer–Emmett–Teller (BET) specific surface area measurements. Also, Fourier transform infrared spectroscopy (FT-IR) was used to investigate sorption behavior of Pb onto TMA-birnessite. TMA-birnessite was found to have higher adsorption ability for Pb than synthetic Na-birnessite and commercial granular activated carbon (GAC). This result suggests that the synthetic organo-birnessites could be effective sorbents for removal of heavy metals from groundwater.
•TMA-birnessite was a hybrid organic-inorganic sorbent for the removal of Pb ions.•TMA-birnessite had high affinity and removal efficiency for Pb ions.•pH was an important parameter influencing the sorption capacity of TMA-birnessite