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Isotherm data of Fe3+, Cr3+ and Co2+ adsorved on surface of silica-propylpiperazinedithiocarbamato

1998; Elsevier BV; Volume: 133; Issue: 3 Linguagem: Inglês

10.1016/s0927-7757(97)00198-2

1873-4359

Maria G. Fonseca, JoséG.P. Espínola, Severino F. de Oliveira, Luiz Carlos Ramos dos Santos, Antônio G. Souza, Cláudio Airoldi,

Chemical Synthesis and Characterization

The silylant agent chloropropyltrimetoxysilane immobilized on silica gel reacts with piperazine, followed by another reaction with carbon disulfide in the presence of sodium hydroxide, to produce a new matrix sodium propylpiperazinedithiocarbamato silica. The basic centres of the resulting surface complexes are the Cr3+, Fe3+ and Co2+ cations from aqueous solution. The adsorbed isotherms for cations were adjusted to fit Giles models. The isotherm for Cr3+ could be classified as L2, while those for Fe3+ and Co2+ fitted the subgroup 2 of C class. The isotherm data show that the capacity of the final carbamate surface to chemisorb Fe3+ and Co2+ is only one third that observed for Cr3+.