Complexing of Pd(II) and Pt(II) by dithiooxamide immobilized on SiO2

Kravchenko, O. V.; Yatsimirskii, K. B.; Belyakova, L. A.; Kozachkova, A. N.; Talanova, Galina G.

doi:10.1007/bf02522658

Cited by 6 publications

(11 citation statements)

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“…The described process of nucleophilic additionelimination of APPS to DTO [15,16] provides small degrees of surface modifi cations, including those due to the ineffi cient reaction conditions. We performed a systematic study of the possibility of direct dithiooxamidation of aminopropyl polysiloxane and its modifi cation (Scheme 1).…”

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“…The maximum sorption capacity at pH 6 for Cu(II) and Zn(II) ions was 0.97 and 0.12 mmol g -1 , respectively, at a concentration of 1.0 mmol g -1 of grafted groups of rubeanic acid. Also known is the use of C 60 fullerene containing dithiooxamide groups for recovery of trace amounts of copper(II) ions [14].The modifi cation of siloxane polymeric matrices with dithiooxamide is represented in the literature by only two examples [15,16]. The authors used a block-copolymer produced by hydrolysis of aminopropyltriethoxysilane (APTES) on the surface of porous silica, which was then treated with rubeanic acid.…”

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“…A common shortcoming of sorbents of this kind is the low concentration of dithiooxamide groups (0.08-0.24 mmol g -1 ) and the resulting poor sorption capacity. The maximum capacity for Pd(II) and Pt(II) ions was 0.198 and 0.103 mmol g -1 , respectively [16].Abstract-Reaction of reamidation of rubeanic acid with aminopropyl polysiloxane was systematically studied. It was found that the given type of transformations make it possible to obtain a derivative of aminopropyl polysiloxane with surface dithiooxamide groups in a concentration of up to 0.78 mmol g -1 at a total degree of substitution of up to 0.25.…”

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confidence: 99%

“…The modifi cation of siloxane polymeric matrices with dithiooxamide is represented in the literature by only two examples [15,16]. The authors used a block-copolymer produced by hydrolysis of aminopropyltriethoxysilane (APTES) on the surface of porous silica, which was then treated with rubeanic acid.…”

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Synthesis of sorption materials based on dithiooxamidate aminopropyl polysiloxane

et al. 2014

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Hybrid organo-inorganic materials produced by chemical modifi cation of polysiloxanes fi nd wide use due to the unique properties of the silica gel matrix and the possibility of obtaining materials with required properties by using an appropriate organic modifi er. One of the most important applications of these materials is their use as sorbents for concentration and recovery of metal ions from aqueous solutions [1,[5][6][7][8].Modifi cation of various polymeric materials with dithiooxamide (DTO) have been actively studied in recent years, which is due to its excellent complexing properties [9], in particular, those for noble metal ions owing to the simultaneous presence of nitrogen and sulfur ions in its structure. It is known that polysaccharides of Pseudochoricystis ellipsoidea weeds [10], cellulose [11] and chitosan are used as natural polymeric matrices. The sorbents obtained demonstrated a high sorption affi nity and selectivity with respect to Pd(II) and Pt(IV) ions, whereas the adsorption of simultaneously present Cu(II), Cd(II), Co(II), Ni(II), and Fe(III) ions was insignifi cant. The sorption capacity for Pd(II) ions at pH 2 was 3.24 mmol g -1 at a concentration of grafted groups of rubeanic acid of 0.4 mmol g -1 [12]. The maximum sorption capacity for Cu(II) and Cd(II) ions at pH 6 was 0.058 and 0.072 mmol g -1 , respectively, at a concentration of complexing groups of 0.150 mmol g -1 [11].Use of a synthetic polymer, polystyrene, makes it possible to substantially raise the sorption capacity for ions of 3d-metals. The maximum sorption capacity at pH 6 for Cu(II) and Zn(II) ions was 0.97 and 0.12 mmol g -1 , respectively, at a concentration of 1.0 mmol g -1 of grafted groups of rubeanic acid. Also known is the use of C 60 fullerene containing dithiooxamide groups for recovery of trace amounts of copper(II) ions [14].The modifi cation of siloxane polymeric matrices with dithiooxamide is represented in the literature by only two examples [15,16]. The authors used a block-copolymer produced by hydrolysis of aminopropyltriethoxysilane (APTES) on the surface of porous silica, which was then treated with rubeanic acid. A common shortcoming of sorbents of this kind is the low concentration of dithiooxamide groups (0.08-0.24 mmol g -1 ) and the resulting poor sorption capacity. The maximum capacity for Pd(II) and Pt(II) ions was 0.198 and 0.103 mmol g -1 , respectively [16].Abstract-Reaction of reamidation of rubeanic acid with aminopropyl polysiloxane was systematically studied. It was found that the given type of transformations make it possible to obtain a derivative of aminopropyl polysiloxane with surface dithiooxamide groups in a concentration of up to 0.78 mmol g -1 at a total degree of substitution of up to 0.25. The composition and structure of the derivatives obtained were characterized by elemental analysis, IR spectroscopy, thermogravimetry, and method of low-temperature adsorption of nitrogen. The sorption of Ni(II), Pd(II), and Pt(II) in a 0.2 M solution of hydrochloric acid was evaluated for the...

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confidence: 99%

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confidence: 99%

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Synthesis of sorption materials based on dithiooxamidate aminopropyl polysiloxane

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Noble metal ion sorption by pyridyl and bipyridyl group-containing chelating polymers

Talanova

Zhong

Кравченко

et al. 2001

J. Appl. Polym. Sci.

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A series of eighteen 4‐vinylpyridine and 4‐methyl‐4′‐vinylbipyridine copolymers with different crosslinkers was examined as sorbents for the noble metal ions of Ag(I), Au(III), Pd(II), and Pt(II) from aqueous solutions. The chelating polymers possess appreciable sorption selectivity for Au(III) over Ag(I) and for Pd(II) over Pt(II). Binding abilities of the copolymers toward the noble metal ions vary as the identity of the chelating heterocyclic amine moiety and the structure of the crosslinkers are altered. © 2001 John Wiley & Sons, Inc. J Appl Polym Sci 80: 207–213, 2001

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