2026-04-13T02:37:36Zhttps://recercat.cat/oai/request

oai:recercat.cat:2117/3284752026-01-21T10:33:38Zcom_2072_1033col_2072_452950

urn:hdl:2117/328475 Response surface methodology based on central composite design for simultaneous adsorption of rare earth elements using nanoporous calcium alginate/carboxymethyl chitosan microbiocomposite powder containing Ni0.2Zn0.2Fe2.6O4 magnetic nanoparticles: Batch and column studies Javadian, Hamedreza Ruiz Planas, Montserrat Sastre Requena, Ana María Àrees temàtiques de la UPC::Enginyeria química Nanocomposites (Materials) Adsorption Chemisorption Calcium alginate Carboxymethyl chitosan Ni0.2Zn0.2Fe2.6O4 Adsorption Rare earth elements RSM Nanocompòsits (Materials) Absorció (Físico-química) In this research paper, the utilization of the magnetic calcium alginate/carboxymethyl chitosan/Ni0.2Zn0.2Fe2.6O4 (CA/CMC/Ni0.2Zn0.2Fe2.6O4) was investigated for the simultaneous aqueous adsorption of Nd (III), Tb (III), and Dy (III). The magnetic products were characterized by FE-SEM, EDX, XRD, FT-IR, TGA, and VSM techniques. The saturation magnetization value for Ni0.2Zn0.2Fe2.6O4 and CA/CMC/Ni0.2Zn0.2Fe2.6O4 was found to be 45.87 and 14.14 emu/g, respectively. Using RSM, a quadratic polynomial equation was obtained to predict the adsorption efficiency of each ion. Under the conditions of pH = 5.5, adsorbent dosage of 0.1 g, initial concentration of 30 mg/L, and contact time of 53 min predicted by RSM, the adsorption efficiencies of Nd (III), Tb (III), and Dy (III) were respectively 95.72, 96.17, and 99.44%. The isotherm and kinetic data were respectively fitted well with Freundlich and pseudo-second-order (PSO) models. The desorption of the loaded ions was effectively carried out by 0.2 M HNO3, and the adsorbent was consecutively utilized with 2.54, 1.63, and 1.16% decrease in adsorption efficiency for Nd (III), Tb (III), and Dy (III), respectively, after the forth cycle. Additionally, the adsorption behavior of the CA/CMC/Ni0.2Zn0.2Fe2.6O4 towards Nd (III), Tb (III), and Dy (III) was studied by using a fixed-bed column technique. This work has been supported by the Spanish Ministry of Economy and Competitiveness (Ref. CTM2017-83581-R). Hamedreza Javadian acknowledges the financial support received (Ref. BES-2015-072506). Peer Reviewed Preprint 2020-07-01 Article https://www.sciencedirect.com/science/article/pii/S0141813019395728 info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/CTM2017-83581-R/ES/ESTRATEGIAS DE RECICLADO DE RESIDUOS QUE CONTIENEN TIERRAS RARAS: MEMBRANAS LIQUIDAS Y PROCESOS DE SORCION MEDIANTE NANOCOMPOSITES MAGNETICOS PARA SU SEPARACION Y RECUPERACION/ Open Access