Adsorption of Ni(II) from model solutions using co-precipitated inorganic oxides
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Adsorption of Ni(II) from model solutions using co-precipitated inorganic oxides Filip Ciesielczyk • Przemysław Bartczak • Karolina Wieszczycka • Katarzyna Siwin´ska-Stefan´ska Magdalena Nowacka • Teofil Jesionowski
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Received: 29 October 2012 / Accepted: 21 December 2012 / Published online: 8 January 2013 The Author(s) 2013. This article is published with open access at Springerlink.com
Abstract The aim of this work was to obtain an inorganic oxide system containing silica and magnesium oxide, and characterized by specific physicochemical properties, in particular well-defined adsorption parameters. The preparation process was carried out according to a co-precipitation method using solutions of sodium silicate and selected inorganic magnesium salt. The oxide system obtained (MgOSiO2) was used as a support (adsorbent) of nickel(II) ions, whose precursors were model solutions of nitrates. The effectiveness of the adsorption process was evaluated using many different analytical techniques, including atomic absorption spectroscopy, energy dispersive X-ray spectroscopy and equivalent point titration. Moreover the stability of adsorbent/adsorbate bonding was estimated. The oxide systems—adsorbents—used in the process were also analyzed according to their physicochemical properties, especially changes in adsorption parameters. The last part of the study involved evaluation of the kinetics of the adsorption process depending on time and the pH of the reaction system. Keywords Inorganic oxide adsorbent Nickel(II) ions Adsorption Atomic absorption spectroscopy Energy dispersive X-ray spectroscopy Equivalent point titration
F. Ciesielczyk (&) P. Bartczak K. Wieszczycka K. Siwin´ska-Stefan´ska M. Nowacka T. Jesionowski Poznan University of Technology, Institute of Chemical Technology and Engineering, M. Sklodowskiej-Curie 2, 60965 Poznan, Poland e-mail: [email protected]
1 Introduction Research work of great importance for scientific advancement, especially in chemical technology, materials science and broadly defined environmental protection, concerns the formation of a new generation of hybrid oxide systems. This substantial research area concerns problems relating to the synthesis of functional inorganic oxides and hybrids, which are characterized by new, defined physicochemical and useful properties. The need for new materials is especially urgent as regards their applications as adsorbents, being alternatives to natural substances. The physicochemical properties of oxide systems depend mainly on the method of their synthesis (Modrzejewska-Sikorska et al. 2010). Co-precipitated oxides (e.g. synthetic silicates) have been used for a long time in many applications, including in the most advanced technologies in electronics, biochemistry and petrochemistry (Kumar 2009). The most beneficial property of the silicates used in the chemical and pharmaceutical industries and agriculture is their adsorption capacity and the possibility of their modification (physical and chemical). They have
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