Copper Complexes Stabilized by Chitosans: Peculiarities of the Structure, Redox, and Catalytic Properties

Kramareva, N. V.; Финашина, Е. Д.; Кучеров, А. В.; Kustov, L. М.

doi:10.1023/b:kica.0000009056.74699.b8

Cited by 14 publications

(8 citation statements)

References 11 publications

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“…15 The research of Yin et al demonstrated that the existence of cupric ion could accelerate the degradation of chitosan by H 2 O 2 , but the effect of the amount of cuprate was no significant. 16 The researchers still discovered that chitosanCu(II) complex had stronger adsorbable activity than active carbon under the same conditions.…”

Section: Introductionmentioning

confidence: 99%

Effect of cupric ion on thermal degradation of chitosan

et al. 2008

J of Applied Polymer Sci

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The thermal degradation of chitosan and chitosan-cupric ion compounds in nitrogen was studied by thermogravimetry analysis and differential thermal analysis (DTA) in the temperature range 30-6008C. The effect of cupric ion on the thermal degradation behaviors of chitosan was discussed. Fourier transform-infrared (FTIR) and X-ray diffractogram (XRD) analysis were utilized to determine the micro-structure of chitosan-cupric ion compounds. The results show that FTIR absorbance bands of À ÀNÀ ÀH, À ÀCÀ ÀNÀ À, À ÀCÀ ÀOÀ ÀCÀ À etc. groups of chitosan are shifted, and XRD peaks of chitosan located at 11.3, 17.8, and 22.88 are gradually absent with increasing weight fraction of cupric ion mixed in chitosan, which show that there are coordinating bonds between chitosan and cupric ion. The results of thermal analysis indicate that the thermal degradation of chitosan and chitosancupric ion compounds in nitrogen is a two-stage reaction.The first stage is the deacetylation of the main chain and the cleavage of glycosidic linkages of chitosan, and the second stage is the thermal destruction of pyranose ring of chitosan and the decomposition of residual carbon, in which both are exothermic. The effect of cupric ion on the thermal degradation of chitosan is significant. In the thermal degradation of chitosan-cupric ion compounds, the temperature of initial weight loss (T st ), the temperature of maximal weight loss rate (T max ), that is, the peak temperature on the DTG curve, and the peak temperature (T p ) on the DTA curve decrease, and the reaction activation energy (E a ) varies with increasing weight fraction of cupric ion.

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Section: Introductionmentioning

confidence: 99%

Effect of cupric ion on thermal degradation of chitosan

et al. 2008

J of Applied Polymer Sci

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“…Role of water was also elucidated. Swelling in water provided elasticity to the polymer matrix which resulted in better interaction of Cu centres and reactive groups of chitosan . The researchers then heterogenized copper complexes on composite supports (egg shell type chitosan/SiO 2 , chitosan MCM‐41) where they could retain the Cu +2 sites in the same coordination.…”

Section: N‐containing Biopolymers As An Efficient Catalystmentioning

confidence: 99%

Valorization of Oceanic Waste Biomass: A Catalytic Perspective

Lucas

Athawale

Rode

2019

The Chemical Record

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Efficacious waste utilization is vital in context of sustainability. The past decade has witnessed attempts of usage of land biomass and wastes for various applications, contributing towards a sustainable society. Exploitation of the marine biomass, which does not compete with habitation and food production like land biomass has been largely unnoticed and therefore not being utilized judiciously. Researchers have mainly exploited these resources as functional materials having significant potential applications. However, a catalytic perspective for the valorisation of these polymers arising from oceanic waste widens their scope and ameliorates its use. The objective of the present review is to demonstrate the effectiveness of chitin/chitosan as a catalyst and as a feedstock for deriving important fuels and chemicals. It displays all the reactions heterogeneously catalyzed by them along with the strategic methodology. Their important catalytic organic transformations attempted so far, have also been discussed. The future perspectives are also presented which if inculcated would improve the value addition of the waste, paving a way for greener and imperishable world.

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“…These polymers contained considerable amounts of functional groups (OH, COOH, CHO, NH 2 , etc.). Because of this, on the one hand, they were adsorbed on an inorganic sup port and, on the other hand, they retained palladium complexes to form polymer-metal compounds of dif ferent composition and structure with them [10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Polymer-modified supported palladium catalysts for the hydrogenation of acetylene compounds

et al. 2016

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Palladium catalysts supported on zinc oxide modified with polyethylene glycol or pectin were syn thesized and investigated in the hydrogenation of acetylene compounds. It was established that the polymer containing catalysts reduce acetylene hyrbons to olefins with high activity, selectivity, and stability. The com position and structure of the obtained composites were studied by elemental analysis, transmission electron microscopy, and XPS spectroscopy. It was found that the nanosized particles of palladium uniformly immo bilized on the surface of zinc oxide were formed in the course of the synthesis of a supported polymer/oxide complex.

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Copper Complexes Stabilized by Chitosans: Peculiarities of the Structure, Redox, and Catalytic Properties

Cited by 14 publications

References 11 publications

Effect of cupric ion on thermal degradation of chitosan

Effect of cupric ion on thermal degradation of chitosan

Valorization of Oceanic Waste Biomass: A Catalytic Perspective

Polymer-modified supported palladium catalysts for the hydrogenation of acetylene compounds

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