Synthesis and physicochemical characterization of a novel adsorbent based on yttrium silicate: A potential material for removal of lead and cadmium from aqueous media

Author(s)

Medeiros, Vinicius Litrenta ; de Araujo, Leandro Goulart ; Ratero, Davi Rubinho ; Paula, Alex Silva ; Molina, Eduardo Ferreira ; Jaeger, Christian ; Marumo, Julio Takehiro ; Nery, Jose Geraldo

• Document type: Journal article
• Source: JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING; v. 8, n. 4, p. 10-pg., 2020-08-01.

Abstract

A new metallosilicate based on yttrium was synthesized and characterized by XRD, FT-IR, Si-29 MAS-NMR, and Y-89 MAS-NMR. The mixed framework of the material was confirmed by the detection of distinct chemical shift groups using Si-29 MAS-NMR (at -82 to -87 ppm, -91 to -94 ppm, -96 to -102 ppm, and -105 to -108 ppm), as well as four distinct chemical shifts in the Y-89 MAS-NMR spectrum (at -89, -142, -160, and -220 ppm). Adsorption and kinetic analyses indicated the potential of the new material for the removal of lead and cadmium from aqueous media. The adsorption results for lead indicated that dynamic equilibrium was reached after five hours, with total lead removal of around 94 %, while for cadmium it was reached in the first hour, with total cadmium removal of around 74 %. The adsorptions of lead and cadmium were modeled using pseudo-first order (PFO) and pseudo-second order (PSO) kinetic models. Although both models provided high R-2 values (0.9903 and 0.9980, respectively), the PSO model presented a much lower chi(2)(red) value (4.41 x 10-4), compared to the PFO model (2.12 x 10-3), which indicated that the rate-limiting step was probably due to the chemisorption of lead from the solution onto the yttrium-based metallosilicate. (AU)

• FAPESP's process: 11/51851-5 - Syntheses and characterization of nanozeolites-enzymes complexes and their use as heterogeneous catalysts in the production of biodiesel by trans esterification of Palm Oil and algae oils (Dunaliella Salina and Haematococcus pluvialis) with ethanol
• Grantee: Jose Geraldo Nery
• Support Opportunities: Regular Research Grants
• FAPESP's process: 19/01858-5 - Development and thromboelastographic characterization of new hemostatic agents with potential for surgical and dental applications aiming at anti-hemorrhagic treatment
• Grantee: Jose Geraldo Nery
• Support Opportunities: Regular Research Grants