Inorganic Anion Removal from Water Using Natural Adsorbents
There is a need for new systems that can be attached to drinking water treatment plants and have the required treatment capacity as well as the selectivity regarding components derived from anthropogenic activities. In a context of high volumes of water and low concentration of contaminants, adsorption/interchange processes are appealing since they meet the required features. Iron oxides such as siderite and molysite, which are respectively based on FeCO3 and FeCl3, can be found in nature. In this work, their observed performance, raw or roasted at different temperatures, as adsorbents of some inorganic anions is discussed. Roasted 1:1 FeCO3: FeCl3 mixture was very selective for arsenic and allowed a 100% removal of As from a 10 mg L-1 As solution. Besides, the 1:1 FeCO3 and FeCl3 mixture roasted at 500 ºC showed good selectivity for, in order of preference, arsenate, bromate, phosphate, fluoride and nitrate anions with distribution coefficients of, respectively, 4200, 2800, 2500 0.4 and 0.03 L g-1.
Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1317270Procedia APA BibTeX Chicago EndNote Harvard JSON MLA RIS XML ISO 690 PDF Downloads 581
 E. Kumar, A. Bhatnagar, W. Hogland, M. Marques, and M. Sillanpää, “Interaction of anionic pollutants with Al-based adsorbents in aqueous media – A review”, Chem. Eng. J., vol. 241, pp. 443-456, Apr. 2013.
 Q. Du, S. Zhang, B. Pan, L. Lv, W. Zhang, and Q. Zhang,, “Bifunctional resin-ZVI composites for effective removal of arsenite through simultaneous adsorption and oxidation” Water Res., vol.47, no. 16, pp. 6064-6074,Oct. 2013.
 M. Ortueta, D. Muraviev, and F. Mijangos, “Iodine elimination by modified polymeric adsorbents with nanoparticles” in Proc. 10th Meeting of Mesa Española de Tratamiento de Aguas (META), Almería, España, 2012.
 F. Li, “Layer-by-layer loading iron onto mesoporous silica surfaces: Synthesis, characterization and application for As(V) removal”, Microporous Mesoporous Mater, vol. 171, pp.139-146. May, 2013.
 A.V. Vitela-Rodriguez, and J.R. Rangel-Mendez, “Arsenic removal by modified activated carbons with iron hydro(oxide) nanoparticles”. J. Environ. Manage, vol.114, pp. 225-231, Jan. 2013.
 C.T. Yavuz, J.T. Mayo, W.W. Yu, A. Prakash, J.C. Falkner, S. Yean, L. Cong, H.J. Shipley, A. Kan, M. Tomson, D. Natelson, and V.L. Colvin, “Low-field magnetic separation of monodisperse Fe3O4 nanocrystals”, Science, vol.314, no. 5801, pp. 964–967, Nov. 2006.
 S. F. Hasany, N.H. Abdurahman, A.R. Sunarti, and R. Jose, “Magnetic iron oxide nanoparticles: Chemical synthesis and applications review”, Curr. Nanosci., vol. 9, no. 5, pp. 561-575, October 2013.
 U. Schwertmann, and R.M. Cornell, The Iron Oxides in laboratory: Preparation and Characterization, 2nd ed., Weinheim: Wiley-VCH, 2000.
 Q. Liu, Y Shan., and H. Guo, “Adsorption of fluoride on synthetic siderite from aqueous solution”, J. Fluorine Chem., vol. 131, no. 5, pp. 635-641, May 2010.
 X. Wang, W. Dong, and Z. Tao, “ A multitracer study on the adsorption of 32 elements on a natural hematite (α-Fe2O3): effects of pH and fulvic acid”, Colloids Surf. A, vol. 223, pp. 135-143, Aug. 2003.
 D. N Muraviev, J. Macanas, J. Parrondo, M. Munoz, A.. Alonso, S. Alegret, M. Ortueta, and F. Mijangos “Cation-exchange membrane as nanoreactor: Intermatrix synthesis of platinum-copper core-shell nanoparticles”, React. Funct. Polym., vol. 67, no. 12, pp. 1612-1621, Dec. 2007.
 G. Zhang, Z. Ren, X. Zhang, and J. Chen, “Nanostructured iron(III)-copper(II) binary oxide: A novel adsorbent for enhanced arsenic removal from aqueous solutions”, Water Res, vol. 47, no. 12, pp. 4022-4031, Aug. 2013.
 T. Yamashita, and P. Hayes, “Analysis of XPS spectra of Fe2+ and Fe3+ ions in oxide materials”, Appl. Surf. Sci., vol.254, no. 8, pp. 2441-2449. Feb. 2008.
 J. Gimenez, M. Martınez, J.D. Pablo, M. Rovira, and L. Duro. “Arsenic sorption onto natural hematite, magnetite, and goethite”, J. Hazard. Mater., vol. 141, no. 3, pp.575–580, Mar.2007.