Abstract
Adsorption of rare earth metals, Eu (III) and Nd (III) was investigated on a new environmental friendly material, thiourea functionalized cellulose. Before usage, the synthesized material was characterized by Fourrier Transform Infrared spectroscopy and energy dispersive X-ray analysis. The influence of adsorption parameters (adsorbent dosage, time, temperature and initial metal concentration) on adsorption capacity was investigated. Experimental data were fitted by using the pseudo-first-order and pseudo-second-order kinetic models. Simultaneously thermodynamic and equilibrium studies have been carried out using Langmuir, Freundlich and Sips isotherm. Maximum adsorption capacities were reached in 30 minutes at 298 K having the value of 27 mg/g for Eu (III) and 73 mg/g for Nd (III).
Highlights
Rapid industrial development during last decades involves development and extensive usage of special materials in different commercial products[1,2,3]
Equilibrium and thermodynamic studies, we proved that beside a proper solid support, usage of thiourea as extractant has improved adsorption properties of cellulose
Functionalized adsorbent material was characterized by using Fourrier Transform Infrared Spectroscopy (FTIR) and Energy Dispersive X-Ray Analysis (EDX), in order to prove that the used technique leads at functionalized cellulose
Summary
Rapid industrial development during last decades involves development and extensive usage of special materials in different commercial products[1,2,3]. Inadequate waste disposal leads at higher increase of public exposure at toxic compounds having negative effects on environment and human health[11]. It was proved the REE’s bioaccumulation through the food chain can cause ailments due to the exposure of humans at low concentration of REEs6,10. Polysaccharides are widely available, biological polymers presenting a remarkable structural diversity Based on their properties, they became an indispensable material for medicine, pharmaceutical industry, food, textile industry and for environmental protection[13,14]. Represents a renewable biopolymer and can be considered as a promising environmental friendly adsorbent[16]. Presents a bigger number of hydroxyl groups which can be modified, improving this way the synthesis yield and increasing his commercial value by making it eligible for new technological applications[16,17]
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