Desorption of lanthanum, europium and ytterbium from Sargassum

Abstract

The desorption of La, Eu and Yb was studied in this work. The purpose of this work was to verify the reversibility of the sorption reaction, and thus the possibility of the desorption process for simultaneous metal recovery and regeneration of the biomass. The desorption of calcium ions at different levels of pH using mineral acid was also verified and the Ca release increased with decreasing pH, achieving 2.5 mequiv. gat pH 2 and 2.8 mequiv. g −1 using 0.1 mol L −1 HNO 3 . Several eluting agents at different concentrations were tested to desorb the lanthanides including nitric and hydrochloric acids, calcium nitrate and chloride salts, EDTA, oxalic and diglycolic acids. 95-100% desorption for all metals was obtained with 0.3 mol L −1 HCl. La desorption with the other eluting agents was 70% with 2 mol L −1 CaCl 2 , 83.7%, with 0.5 mol L −1 EDTA and 88.4% with 0.023 mol L −1 diglycolic acid. A plateau was reached when a liquid to solid ratio (L/S) of 2 L g −1 was used with 0.1 mol L −1 HNO 3 . Desorption levels ranged between 85 and 95%. At the same (L/S) ratio, 0.2 mol L −1 HCl was able to elute all the metals from the individual metal loaded biomass, although it could not remove the metals completely from the mixed-metal loaded biomass. The desorption levels decreased with increasing metal sorption affinity as follows, 94.0, 86.3 and 75.2% for Yb, La and Eu, respectively when the eluting agent was 0.1N HCl. There was no difference between not washing the biomass at all and washing it either once or twice after the sorption process.

Desorption of La3+ and Ce3+ from Treated ‘Chert’ a Siliceous Byproduct of the Phosphate Mining Industry of Gafsa-Metlaoui Basin (Southwestern Tunisia)

“…It was reported that adsorption/desorption behavior of ions is related to their physicochemical properties [41]. Diniz and Volesky [42] stated that substitution of lanthanides ions, characterized by a large ionic radius, usually involve large cations such as calcium. In the same way, Moldoveanu and Papangelakis [25] assume that cations with similar radius to those of lanthanides such as calcium are more successful in replacing them by meeting similar steric requirements on the surface.…”

Study of cobalt (II) biosorption on Sargassum sp. by experimental design methodology

“…Algal samples were washed with tap water and distilled water to remove sand and excess of sodium and potassium ions. After drying overnight at a maximum temperature of 55°C to avoid degradation of the binding sites (Diniz et al 2006), the samples were grounded to an average particle size of 0.7 mm. The biomasses were subsequently loaded with Mg 2?…”

“…4, 5, 6 were generated by varying two factors while keeping the others constant in center values. Adsorption solution pH influences both cell surface metal binding sites and metal chemistry in water (Diniz 2006). These phenomena presumably are due to its influence on the surface properties of the adsorbent and ionization/dissociation of the adsorbate molecule (Ghaedi et al 2014a).…”

Biosorption of Metals: State of the Art, General Features, and Potential Applications for Environmental and Technological Processes

“…Column desorption is used for the metal recovery, but this procedure under selected conditions may be operated to carry out chromatographic elution by the displacement of the adsorbed components in enriched fractions containing each metal (Diniz & Volesky, 2006). This is resulted of the simple drag of the previous separation on frontal analysis.…”

“…9 were 93.3% and 60.4 times of recovery percentage and concentration factor, respectively; which are expressive and satisfactory for the column biosorption purposes (Oliveira, 2011). For biosorption and desorption processes, other important aspect is the biosorbent reuse for recycles biosorption-desorption according the cost benefit between the biosorption capacity loss during desorption steps and the metal recuperation operational yield (Diniz & Volesky, 2006;Gadd, 2009;Godlewska-Zylkiewicz, 2006;Gupta & Rastogi, 2008;Volesky et al, 2003). Oliveira (2007) performed the neodymium column biosorption by Sargassum sp.…”