Palladium adsorption on natural polymeric sericin-alginate particles crosslinked by polyethylene glycol diglycidyl ether

Autor(es)

da Silva, Thiago Lopes ^[1] ; Carlos da Silva, Meuris Gurgel ^[1] ; Adeodato Vieira, Melissa Gurgel ^[1]

Afiliação do(s) autor(es)

^[1] Univ Estadual Campinas, Sch Chem Engn, Albert Einstein Av, 500, BR-13083852 Campinas - Brazil

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING; v. 9, n. 4 AUG 2021.
• Citações Web of Science: 0

Resumo

The use of palladium (Pd) is growing and its scarcity, high price and the pollution generated in its mining motivate the development of research on its removal from effluents. In this work, the use of particles produced from waste sericin and alginate blend crosslinked by polyethylene glycol diglycidyl ether for Pd adsorption was evaluated by means of kinetic and equilibrium studies, thermodynamic parameters and characterization analyses. Sericin is a protein, present at Bombyx mori cocoons, which is discarded in the silk yarn process. Because of its chemical characteristics, the protein can form blends, as with alginate, a polysaccharide present in brown algae. The produced particles are macroporous with amorphous structure and surface area of 5.2 m(2)/g. In kinetics, removals above 97% were achieved from 0.5 mmol/L Pd solution (pH 2.5-3.0) with better pseudo-second order rate law fitting. The Langmuir model was better fitted to the equilibrium, but the surface has been proved to be energetically heterogeneous. External mass transfer resistance has proved to be the limiting step of adsorption. Chemisorption and physisorption are involved at metal uptake and maximum adsorbed capacities were 0.157, 0.191 and 0.249 mmol/g, at 25, 40 and 55 degrees C, indicating the feasibility of the adsorbent use for Pd removal/recovery. (AU)

• Processo FAPESP: 17/18236-1 - Recuperação de íons metálicos nobres e íons terras-raras presentes em soluções aquosas por bioadsorção em partículas de blenda de sericina e alginato
• Beneficiário: Melissa Gurgel Adeodato Vieira
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 19/11353-8 - Centro Brasileiro de Pesquisa em Água (BWRC)
• Beneficiário: Lauro Tatsuo Kubota
• Modalidade de apoio: Auxílio à Pesquisa - Programa Centros de Pesquisa em Engenharia