Chemical modification of in natura collagen by acidic catalysis – structural characterization and mechanistic features of Cd(II) sorption by solution microcalorimetry
| Autor: | Eunice F.S. Vieira, Marcos A.S. Andrade, Esdras S. Silva, Fernanda S.C. dos Anjos, Antonio R. Cestari |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Isothermal microcalorimetry
Cadmium Aqueous solution General Physics and Astronomy chemistry.chemical_element Chemical modification Sorption 02 engineering and technology General Chemistry 010501 environmental sciences 021001 nanoscience & nanotechnology 01 natural sciences Catalysis Adsorption chemistry Chemisorption General Materials Science 0210 nano-technology 0105 earth and related environmental sciences Nuclear chemistry |
| Zdroj: | Matéria (Rio de Janeiro). 23 |
| ISSN: | 1517-7076 |
| DOI: | 10.1590/s1517-707620180004.0553 |
| Popis: | Chemically-modified in natura collage was prepared under acidic catalysis for using in sorption of Cd(II) from aqueous solutions. Simultaneous determination of the quantity and energetic parameters of Cd(II) sorption on PGA-scale at pH 8.0 were determined using solution microcalorimetry (SM). The calorimetric enthalpies of Cd(II) sorption on PGA-scale are all exothermic, and Cd(II) adsorption energies decrease as temperature increases. The maximum sorption capacity of PGA-scale for Cd(II) (438 μmol g-1) is superior with many sorption data reported in the literature. Characterization and SM indicate that the main sites for Cd(II) sorption are located in the collagen structure of PGA-scale. It was found that the interactions PGAscale/ Cd(II) are mainly due to chemisorption and diffusion may occur at the PGA-scale/Cd(II) interface. The results of this study underline the good features of PGA-scale as a promising material for sorption of Cd(II) from aqueous media. Keywords: Cadmium; biosorbents; fish scales; acidic catalysis; solution microcalorimetry; thermodynamics. |
| Databáze: | OpenAIRE |
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