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In this study, pectin encapsulated Na-zeolite A particles (P-ZA) was synthesized using the impregnation method and it was used as an adsorbent for adsorption of multicomponent lanthanides ions. The Na...-zeolite A (zeolite A) was prepared from natural kaolin by the hydrothermal method, while pectin was isolated from white pith of citrus maxima fruits. Scanning electron microscope (SEM) images suggested that P-ZA composite adopts a nest-like shaped surface morphology occupied by zeolite A particles or pectin encapsulated skeleton system of zeolite A particles. The size of P-ZA particles was approximately 125 μm. The highest adsorption capacity of La^<3+>, Ce^<3+>, Nd^<3+>, Sm^<3+>, and Dy^<3+> on P-ZA composite is 4.81×10^<‒5> M, 4.65×10^<‒5> M, 6.19×10^<‒5> M, 6.04×10^<‒5> M, and 6.03×10^<‒5> M, respectively, at the contact time of 60 mins. The lanthanides ions are adsorbed on the P-ZA surfaces through either ion exchange with Na-zeolite A or coordination with the functional groups of pectin, and are further stabilized by their hydrolysis on the P-ZA surfaces. The results suggest that P-ZA composite has the potential to be utilized as an adsorbent for the initial step of separation and purification of lanthanides after leaching from the metallurgical ores.続きを見る
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