ADSORPTION OF Pd (II) ON N- AND S- MODIFIED SILICA SORBENTS.
- Resource Type
- Article
- Authors
- Petrova, Petranka; Chochkova, Maya; Karadjov, Metody
- Source
- Journal of Chemical Technology & Metallurgy. 2022, Vol. 57 Issue 5, p962-970. 9p.
- Subject
- *SORBENTS
*SOLID phase extraction
*SILICA gel
*PHYSISORPTION
*ADSORPTION
*SCHIFF bases
*SILICA
- Language
- ISSN
- 1314-7471
In this study two silica gel sorbents with different mobilization agents were applied for solid phase extraction of palladium(II) from 0.1 mol L-1 - 3 mol L-1aqueous HCl solution. The first sorbent was prepared by immobilization of 4 - aminoantypyrine Schiff base (Schiff B-4-AAP) and the second one - by introduction of S-containing amino acid analog, N-benzyloxycarbonyl-L-methionine (Z-Met-OH) on the silica gel surface through physical adsorption. Thus, the obtained two silica sorbents were functionalized with nitrogen (Sig ~ Schiff B-4-AAP) and nitrogen and sulfur (Sig ~ Z-Met-OH) chelating groups. The role of various chemical parameters was studied for quantitative sorption of Pd(II) through batch adsorption experiments. It was found that the extraction efficiency of the newly prepared sorbents toward Pd(II) depends on the concentration of HCl in the sample solution and the contact time between Pd ions and the sorbents as well as on the type and concentration of the eluent. The optimal acid concentration for quantitative adsorption of Pd(II) was 1 mol L-1 HCl. The experiments showed that the coexisting ions - base metals exhibited little interference on the Pd(II) separation. [ABSTRACT FROM AUTHOR]