Sorption of U(VI), Mn (II), Cu(II), Zn(II), and Cd(II) from multi-component phosphoric acid solutions using MARATHON C r
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RESEARCH ARTICLE
Sorption of U(VI), Mn (II), Cu(II), Zn(II), and Cd(II) from multi-component phosphoric acid solutions using MARATHON C resin Mohamed H. Taha 1 Received: 15 May 2020 / Accepted: 13 October 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Crude phosphoric acid is a vital component used in making phosphate fertilizers. Depending on the processes used in producing the crude phosphoric acid, it usually contains organic and inorganic contaminants. To make environmentally friendly phosphate fertilizers, these contaminants must be removed from the crude phosphoric acid stock used in making fertilizers. In this paper, commercially available strong cation exchange resin, Marathon C, was used to study the adsorptive removal of U(IV), Mn(II), Cd(II), Zn(II), and Cu(II) from synthetic multi-component phosphoric acid solutions and commercial crude phosphoric acid. Important parameters on the adsorption process such as the effects of contact time, initial metal ion concentration, sorbent dose, and concentration of phosphoric acid were investigated. The results suggested that the adsorption process reached equilibrium within 240 min for the five metal ions studied and the resin had adsorptive affinity for the metal ions in the order of U(IV) > Zn(II) > Cu(II) > Mn(II) > Cd(II). The results from the kinetics and isotherm models from the studies are very consistent with pseudo-second-order kinetic and Langmuir isotherm models. Simultaneous adsorptive removal of metal ions from the crude phosphoric acid strongly suggests that the Marathon C resin could be used in removing toxic metal ions from crude phosphoric acids used in making phosphate fertilizer. Keywords Sorption . Uranium . Multi-component solution . Phosphoric acid . Marathon C resins
Introduction Phosphorus, together with potassium and nitrogen, are important nutrients for corps development and growth. Modern farming is depending mainly on phosphate fertilizers, which are produced from phosphate rock, for food production to meet the world population growth. Thus, phosphorus is considered as an essential building block of the food security system (Geissler et al. 2015; Steiner et al. 2015; Geissler et al. 2019). The world demand for phosphate rock is increasing because of the increase of the world population as well as food demand (Ridder 2012). The United Nations reported that food production worldwide has been increased by 70% in past Responsible Editor: Tito Roberto Cadaval Jr * Mohamed H. Taha [email protected] 1
Nuclear Materials Authority, P.O. Box 530, El Maddi, Cairo, Egypt
decades due to the observed inflation in the world population to become over 9 billion by 2020. Consequently, the global demand for phosphate rock will increase as a result of the world population growth (van Kernebeek et al. 2018; Schoumans et al. 2015). Phosphate rocks are mainly classified as (i) sedimentary phosphate deposits (which represent about 75% of the world phosphate rock that exist in Egypt, Jordan, and the USA) and (ii) igneous phos
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