Polystyrene-supported thiosemicarbazone-transition metal complexes: synthesis and application as heterogeneous catalysts

Chettiar, K Sivadasan; Sreekumar, K.

doi:10.1002/(sici)1097-0126(199906)48:6<455::aid-pi166>3.0.co;2-f

Cited by 10 publications

(2 citation statements)

References 16 publications

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“…Sorption values were obtained such as 400 mg UO 2 2+ /g of dry amidoximated poly (DPAAm) and 250 mg UO 2 2+ /g of dry amidoximated graft polymer. Chettiar and Sreekumar synthesised dithiosemicarbazone functionalised polymer, namely, poly(styrene-divinylbenzene) and poly (hydroxyethyl methacrylate-divinyl benzene) beads having definite porosity for adsorption of toxic metal ions [ 181 ]. Improved crosslinked polyacrylamides containing various functional moieties have been synthesised by transamidation reaction in the aquatic and non-aquatic medium by Hofmann’s reaction.…”

Section: Factors Affecting the Adsorption Processmentioning

confidence: 99%

A Review of Adsorbents for Heavy Metal Decontamination: Growing Approach to Wastewater Treatment

Gupta¹,

Sharma

Sharma³

et al. 2021

Materials

158

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Heavy metal is released from many industries into water. Before the industrial wastewater is discharged, the contamination level should be reduced to meet the recommended level as prescribed by the local laws of a country. They may be poisonous or cancerous in origin. Their presence does not only damage people, but also animals and vegetation because of their mobility, toxicity, and non-biodegradability into aquatic ecosystems. The review comprehensively discusses the progress made by various adsorbents such as natural materials, synthetic, agricultural, biopolymers, and commercial for extraction of the metal ions such as Ni2+, Cu2+, Pb2+, Cd2+, As2+ and Zn2+ along with their adsorption mechanisms. The adsorption isotherm indicates the relation between the amount adsorbed by the adsorbent and the concentration. The Freundlich isotherm explains the effective physical adsorption of the solute particle from the solution on the adsorbent and Langmuir isotherm gives an idea about the effect of various factors on the adsorption process. The adsorption kinetics data provide valuable insights into the reaction pathways, the mechanism of the sorption reaction, and solute uptake. The pseudo-first-order and pseudo-second-order models were applied to describe the sorption kinetics. The presented information can be used for the development of bio-based water treatment strategies.

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Section: Factors Affecting the Adsorption Processmentioning

confidence: 99%

A Review of Adsorbents for Heavy Metal Decontamination: Growing Approach to Wastewater Treatment

Gupta¹,

Sharma

Sharma³

et al. 2021

Materials

158

View full text Add to dashboard Cite

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“…Nevertheless, three approaches can be found in the literature for polyTSC synthesis: (i) metallopolymers, (ii) polymers bearing TSC side chains, and (iii) polymers bearing TSC backbones. Metallopolymer TSCs are reported for several metals like Zn, Hg, or Cu, while the TSC group is participating in the backbone formation or is present as a side chain. − In the second approach, radically polymerized styrene or acrylate resins were formed, which already had TSC groups installed as side-chains of the monomers, or were further modified to yield them. − Other polymer supports like chitosan and cellulose have been postmodified to obtain TSC functional materials as well. − In a third approach, the TSC function is incorporated in the backbone of the polymer. Rasool et al condensed thiosemicarbazide with 2 equivalents of salicylaldehyde prior to the polycondensation with formaldehyde and barbituric acid (see Figure A) .…”

Section: Introductionmentioning

confidence: 99%

Polythiosemicarbazones by Condensation of Dithiosemicarbazides and Dialdehydes

2022

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An easy access to thermoplastic polythiosemicarbazones (polyTSCs) is presented by condensation of dithiosemicarbazides and aromatic dialdehydes, yielding eight polyTSCs and five co-polyTSCs, exhibiting M ns up to 38 kDa in good yields (58–93%). The polymerization proceeds at room temperature and is typically finished after 2–3 h. The monomer scope was investigated, revealing broad moiety tolerance (aliphatic, cyclic, benzylic, and aromatic groups). Full characterization was performed by proton and carbon NMR spectroscopy, IR spectroscopy, and size exclusion chromatography, confirming the anticipated chemical structure of polyTSCs. Thermal analysis of the polymers showed degradation starting at ∼200 °C by decomposition of the TSC function. Glass transitions were only observed for polymers derived from rigid monomers (162–198 °C). Further versatility of the reaction was underlined by the synthesis of five copolymers using different dithiosemicarbazide monomers.

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Effect of mixed solvent consisting of water and organic solvent on photografting of glycidyl methacrylate on polyethylene film

Irwan

Kuroda

Kubota

et al. 2004

J of Applied Polymer Sci

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ABSTRACT:The effect of a mixed solvent consisting of water and organic solvents such as acetone and methanol on the photografting ( Ͼ 300 nm) of glycidyl methacrylate (GMA) on linear low-density polyethylene film (thickness ϭ 30 m) was investigated at 60°C. Xanthone was used as a photoinitiator by coating the film surfaces with it. The maximum percentage of grafting was observed at a certain concentration of organic solvent in the mixed solvent, which depends on the nature of organic solvents such as methanol (ca. 5 vol %) and acetone (ca. 15 vol %). On the basis of attenuated total reflection infrared spectroscopy of the grafted film, the absorbance ratio of the carbonyl peak of grafted poly(GMA) chains at 1728 cm Ϫ1 to the methylene peak of polyethylene substrate at 1460 cm Ϫ1 increased with increasing the concentration (0 -15 vol %) of organic solvent, which was commonly observed for methanol and acetone. Distribution of grafted poly(GMA) chains in the cross section of the grafted film was examined using a scanning electron microscope. The results showed that the grafted chains of the GMA-grafted samples prepared in water solvent tended to penetrate into the inside of the film compared to those of the grafted samples prepared in the mixed solvent due to higher affinity of the GMA monomer to the polyethylene substrate compared to the organic solvents used. Grafted poly(GMA) chains were aminated with ethylenediamine (En) in N,NЈ-dimethylformamide at 70°C for 3 h. It was found that the reactivity toward En was higher for the sample prepared in mixed solvent than for the sample prepared in water solvent. The aminated GMA-grafted sample had the ability to adsorb cupric ions, showing that a higher amount of adsorbed cupric ion is recorded for the sample prepared in mixed solvent than for the sample prepared in water solvent. Complexes of aminated GMA-grafted chains with cupric ion exhibited the catalytic activity of decomposition of hydrogen peroxide at 50°C, and its ability depended on the location of the grafted chains in the film substrate.

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Polystyrene-supported thiosemicarbazone-transition metal complexes: synthesis and application as heterogeneous catalysts

Cited by 10 publications

References 16 publications

A Review of Adsorbents for Heavy Metal Decontamination: Growing Approach to Wastewater Treatment

A Review of Adsorbents for Heavy Metal Decontamination: Growing Approach to Wastewater Treatment

Polythiosemicarbazones by Condensation of Dithiosemicarbazides and Dialdehydes

Effect of mixed solvent consisting of water and organic solvent on photografting of glycidyl methacrylate on polyethylene film

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