Xanthate-modified alginates for the removal of Pb(II) and Ni(II) from aqueous solutions: A brief analysis of alginate xanthation

Autor(es)

Cordova, Bryan M. ^[1] ; Infantas, Gian C. ^[2] ; Mayta, Sergio ^[2] ; Huamani-Palomino, Ronny G. ^[1] ; Kock, Flavio Vinicius C. ^[3] ; de Oca, Juan Montes ^[4] ; Valderrama, A. C. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Nacl Ingn, Lab Invest Biopolimeros & Metalofarmacos, Fac Ciencias, Escuela Profes Quim, Av Tupac Amaru 210, Lima 25 - Peru

^[2] Univ Nacl Ingn, Av Tupac Amaru 210, Lima 25 - Peru

^[3] Univ Fed Sao Carlos, Dept Chem, Lab Nucl Magnet Resonance, Sao Carlos - Brazil

^[4] Natl Univ Engn, Ctr Dev Adv Mat & Nanotechnol, Av Tupac Amaru 210, Lima 25 - Peru

• Tipo de documento: Artigo Científico
• Fonte: International Journal of Biological Macromolecules; v. 179, p. 557-566, MAY 15 2021.
• Citações Web of Science: 0

Resumo

Mining is themost common activity that introduces heavy metal ions into aquatic ecosystems, especially in low income-developing nationswhere governments are implementing stricter regulations for industrialwastewater. In this context, this work is focused on the application of xanthate-modified alginates for the removal of Pb(II) and Ni(II) fromaqueous solutions. In order to confirm the presence of xanthate groups alongside alginate chains, characterization by second-derivative FT-IR was carried out and significance evidence attributed to xanthate groups was found at around 1062-1079 cm(-1), 829-845 cm(-1) and 620-602 cm(-1). In addition to this, thermogravimetric analysis and differential scanning calorimetrywere employed to explore thermal properties of modified alginates. According to these results, enthalpy changes (Delta H) characteristic of dehydration and collapse of biopolymeric structure were estimated as +11.41 J/g and -6.83 J/g, respectively. Furthermore, the presence of S element was confirmed by EDS mapping technique, whereas FESEM image showed a cracked and homogeneous surface distribution. On the other hand, the effect of important parameters such as pH, dosage, initial concentration as well as Langmuir and Freundlich isotherm were deeply discussed. Finally, rheological measurements were performed aiming to investigate the gel-like viscoelastic features associated to nickel xanthate compound. (C) 2021 Elsevier B.V. All rights reserved. (AU)

• Processo FAPESP: 18/16040-5 - Controle Biorracional de Insetos Pragas
• Beneficiário: Flavio Vinicius Crizostomo Kock
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado