Thermosensitive gels incorporating polythioether units for the selective extraction of class b metal ions

Chayama, Kazuaki; Morita, Yasuji; Iwatsuki, Satoshi

doi:10.1016/j.chroma.2010.07.015

Cited by 14 publications

(9 citation statements)

References 21 publications

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“…8 K. Chayama prepared novel thermoresponsive copolymers consisting of N-isopropylacrylamide and a monoaza-tetrathioether derivative for selective extraction of soft metal ions, such as Ag + , Cu 2+ , Au 3+ and Pd 2+ . 9 A chelating coefficient of 98.96% was achieved. When the solution temperature is below the LCST, the absorption efficiency of the hydrogel will be enhanced by increasing the contact between the gel and heavy metal ions.…”

Section: Introductionmentioning

confidence: 94%

“…Firstly, sulfur, a member of the third period, having low-lying empty 3d orbitals, can chelate with noble metals, so thioethers have been used as modifiers of the surface of Au and Ag nanoparticles. 12,13 Besides, thioethers were also used in column chromatography, 9 and chelating resins, 14,15 due to their selective absorption of heavy metal ions. Secondly, they possess oxidation sensitivity.…”

Section: Introductionmentioning

confidence: 99%

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Novel thermo-sensitive hydrogels containing polythioether dendrons: facile tuning of LCSTs, strong absorption of Ag ions, and embedment of smaller Ag nanocrystals

et al. 2015

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Section: Introductionmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

Novel thermo-sensitive hydrogels containing polythioether dendrons: facile tuning of LCSTs, strong absorption of Ag ions, and embedment of smaller Ag nanocrystals

et al. 2015

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“…Also, the use of carbon nanotubes grafted with thiol and dithiocarbamate ligands [8] and some sort of sulphide [9] support this fact. Several other types of research [10][11][12] on heavy metal remediation have been carried out by treating contaminated water with sulphur-modified agents. Moreover, in the course of phytoextraction of heavy metal in municipal sewage sludge, the introduction of elemental sulphur improved heavy metal uptake by plants [13].…”

Section: Introductionmentioning

confidence: 99%

Heavy metal sorption using thiolated oils of Elaeis guineensis and Glycine max

et al. 2020

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Sulphur-modification of matter confers improved heavy metal affinity and could be exploited in the treatment of heavy metal contaminated water. This paper is aimed at comparing the liquid-liquid Ag+ sorption capacities of normal and thiolated: palm oil (PO), palm kernel oil (PKO) and soybean oil (SBO), respectively. The vegetable oils were modified with 1-heptanethiol, and the thioether-functionalized (TF) oils were utilized for the removal of Ag+ present as a contaminant in water, while the unmodified oils acted as controls. The liquid-liquid equilibrium contact time was determined to be 6 hours. The result achieved after equilibration revealed the effectiveness of TF oils in the removal of Ag+ from a 600 ppm AgNO3 simulated water. While TF-SBO reduced the cation concentration to a level less than the detection limit, TF-PKO only showed appreciable sorption capacity (below 30%) relative to the normal oils. The order of Ag+ sorption capacity (TF-SBO > TF-PO > TF-PKO) was ascribed to various levels of unsaturation of fatty acid chains encountered in the lipids. A higher number of sorption-active TF sites is achievable with a greater degree of fatty acid unsaturation. On that note, highly unsaturated vegetable oils (such as that of Glycine max) were recommended.

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“…[26][27][28][29][30][31][32] For example, thermoresponsive hybrids of PNIPAAm with inorganic compounds, such as gold nanoparticles, [33][34][35][36][37][38][39][40][41] gold nanocages, 42 silver nanoparticles, 43 magnetic nanoparticles, [44][45][46][47] silica nanoparticles [48][49][50] and silsesquioxanes, [51][52][53][54] have been developed with the aim of producing functional organic/inorganic nanomaterials. In addition, copolymers of PNIPAAm with acrylic acid, 55 carboxylates, 56 crown ethers, 57 aza crowns, 58 polythioethers, 59 phenanthoroline, 60 terpyridine 61 and iminodiacetic acid derivatives 62 have been synthesized to tune the LCST transition and achieve the extraction and recognition of metal ions. However, there have been no reports on controlling the alignment of metal complexes in these materials.…”

Section: Introductionmentioning

confidence: 99%

Morphological control of hybrid amphiphilic poly(N-isopropylacrylamide)/metal cyanide complexes

Kuroiwa

Koga

Ishimaru

et al. 2016

Polym J

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A number of amphiphilic N-isopropylacrylamide (NIPAAm) oligomers and polymers with a S-1-dodecyl-Sʹ-trithiocarbonate (DTC) and an amino terminal group were prepared using RAFT polymerization: DTC-NIPAAm 13-NH 3 Cl (1), DTC-NIPAAm 61-NH 3 Cl (2), DTC-NIPAAm 78-NH 3 Cl (3), DTC-NIPAAm 119-NH 3 Cl (4). and DTC-NIPAAm 274-NH 3 Cl (5). Aqueous solutions of 1-5 became cloudy upon heating at pH 10, while 1-4 did not exhibit thermosensitivity at pH 7.0, instead forming stable rods and vesicles in aqueous solution. Nanorods and nanosquares were obtained from metal cyanide complexes of 1 and 2, both of which had low degrees of polymerization, and aqueous solutions of these nanocomposites became cloudy at pH 7.0. The electrostatic interactions between the amine segments and the anionic metal cyanide complexes as well as the low degree of polymerization in the vicinity of approximately 100 were both found to have a significant role in the morphology and thermoresponsiveness of the hybrids. These hybrid NIPAAm oligomer/metal cyanide complexes may allow the design of flexible, functional supramolecular systems in aqueous solutions.

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Thermosensitive gels incorporating polythioether units for the selective extraction of class b metal ions

Cited by 14 publications

References 21 publications

Novel thermo-sensitive hydrogels containing polythioether dendrons: facile tuning of LCSTs, strong absorption of Ag ions, and embedment of smaller Ag nanocrystals

Novel thermo-sensitive hydrogels containing polythioether dendrons: facile tuning of LCSTs, strong absorption of Ag ions, and embedment of smaller Ag nanocrystals

Heavy metal sorption using thiolated oils of Elaeis guineensis and Glycine max

Morphological control of hybrid amphiphilic poly(N-isopropylacrylamide)/metal cyanide complexes

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