Complexation of transition metal ions on the surface of carboxyethylated aminopolysiloxanes

Неудачина, Л. К.; Лакиза, Н. В.

doi:10.1134/s0036023614060151

Cited by 4 publications

(2 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The results for the effect of pH on the purification of the metals are presented in Table 3. There was a gradual increase in the extraction from pH 2 to a maximum at pH 6 mostly, which was within the limit of 5.5-7.0 [25] recorded using aminopolysiloxane for similar adsorption studies [26]. Above pH 6, the removal efficiency decreased as the pH increased to pH 9, which promoted the precipitation of metal hydroxide in solution.…”

Section: Effect Of Phsupporting

confidence: 62%

Immobilized Thiosalicylic Ligand System Potentials for the Detoxification of Some Heavy Metals from Tannery Wastewater

Habila¹,

Ezeh²,

Saidu³

et al. 2021

SJC

View full text Add to dashboard Cite

Polysiloxanes are characterized by silicon and oxygen backbone and are hydrophobic in nature with low moisture uptake widely used for medical applications. Polysiloxane immobilized thiosalicylic acid ligand system has been prepared through sol-gel method, gelation was observed after 40 minutes. The immobilized ligand was characterized using FTIR, the spectrum showed characteristic absorption bands (cm -1 ) at: 3377 (OH), 2981 (C-H stretch); 2631 (SH); 1587 to 1684 (C=C, C=O); 1032 to 1144 (Si -O) respectively. SEM analysis showed irregular particle sizes of the polysiloxane matrices while EDX elemental composition gave (wt %): 3-CPPS; Si (50.45), O (25.02) and Cl (24.57). F -3CPPS showed, O (58.68), Si (41.32); thiosalicylic (7.14 of S). The extraction of metal ions (Cr 3+ , Fe 3+ , Pb 2+ , Cu 2+ and Zn 2+ ) were studied using Microwave Plasma Atomic Emission Spectrophotometer (Agilent MPAES-4200) at pH 6.0. Thermodynamic range with respect to Cr 3+ , Fe 3+ , Pb 2+ , Cu 2+ and Zn 2+ yielded negative values for∆G o : Cu 2+ -(11.483 to 14.842) to Zn 2+ -(14.368 to 14.842)KJmol -1 ; positive values for ∆H o : Fe 3+ (0.000) to Pb 2+ (105.130)KJmol -1 and ∆S o : Zn 2+ (47.421) to Pb 2+ (389.328)Jmol 1 K 1 respectively, indicating spontaneous, endothermic reactions and high degree of disorderliness with respect to metal ion binding capacity to the ligand system.

show abstract

Section: Effect Of Phsupporting

confidence: 62%

Immobilized Thiosalicylic Ligand System Potentials for the Detoxification of Some Heavy Metals from Tannery Wastewater

Habila¹,

Ezeh²,

Saidu³

et al. 2021

SJC

View full text Add to dashboard Cite

show abstract

“…It was shown in [28] that Cu(II) ions are present in dilute solutions as hydrated ions at pH < 6.0, and Ni(II) and Co(II) ions, at pH values smaller than 7.0 and 7.5, respectively. As the solution pH increases, ammonia complexes are formed, which is a probable reason for the shift of the optimal pH range for sorption of Ni(II) and Co(II) to the more alkaline range, compared with Cu(II) ions.…”

Section: Resultsmentioning

confidence: 99%

Sorption recovery of transition metals with dithiooxamidated polysiloxane

et al. 2014

Self Cite

View full text Add to dashboard Cite

Effect of the acidity of the sorption solution on the recovery of Cu(II), Ni(II), Co(II), Ag(I), and Pd(II) ions was studied for dithiooxamidated polysiloxanes with degrees of modifi cation of 0.10 and 0.21. The constant acidity of the solution was maintained with ammonia, acetate, and ammonia-acetate buffer solutions. The optimal sorption conditions of metal ions from individual solutions were found. The distribution coeffi cients and pairwise selectivity coeffi cients were calculated for all the ions studied. It was fund on the basis of the selectivity coeffi cients that introduction of dithiooxamide groups into the structure of polysiloxane yields an effective sorbent for recovery of Pd(II) and Ag(I).

show abstract

Complex new materials from simple chemistry: Combining an amino‐substituted polysiloxane and carboxylic acids

Zhao

Yao

et al. 2017

J. Polym. Sci. Part A: Polym. Chem.

View full text Add to dashboard Cite

Changes in rheological, adhesive, and swelling properties of quaternary salts, made by adding one of eight mono‐ or six α,ω‐alkanedioic acids (the latter with two to six or nine carbon atoms) to 6‐7PSil (a polysiloxane with 6%–7% of the monomer units contain a 3‐aminopropyl group) have been correlated with the salt structures. The simple acid‐base chemistry initiates drastic changes in the bulk properties of the materials that depend on the amount and type of the added acid. Thus, the quaternized forms of the 6‐7PSil have significantly enhanced viscoelastic and adhesive properties compared to those of the initial polysiloxane, and they can swell selectively liquids based on their polarity. Also, interpenetrating networks have been made in situ by photopolymerization of salts with vinylic carboxylic acids. DFT calculations on model systems consisting of dimethylammonium α,ω‐alkanedioate salts with two to six carbon atoms provide insights into the interactions responsible for the unexpected dependence of the properties of the 6‐7PSil salts on the chain lengths of the diacids. The potential for applying the methodologies described here to systems with other amino‐substituted polymers and other acid types is noted. © 2017 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2017, 55, 3851–3861

show abstract

Complexation of transition metal ions on the surface of carboxyethylated aminopolysiloxanes

Cited by 4 publications

References 14 publications

Immobilized Thiosalicylic Ligand System Potentials for the Detoxification of Some Heavy Metals from Tannery Wastewater

Immobilized Thiosalicylic Ligand System Potentials for the Detoxification of Some Heavy Metals from Tannery Wastewater

Sorption recovery of transition metals with dithiooxamidated polysiloxane

Complex new materials from simple chemistry: Combining an amino‐substituted polysiloxane and carboxylic acids

Contact Info

Product

Resources

About