The study of non-isothermal degradation of acrylic ion-exchange resins

Chambree, Dorina; Iditoiu, C.; Segal, E.; Cesáro, A.

doi:10.1007/s10973-005-6914-2

Cited by 3 publications

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“…The residue left at 900 °C is ash and is about 0.9% of the original sample. The described transformations due to the accompanying changes and mass losses corresponded well to the results described in the work [ 62 ], where by mass spectrometry, volatile process products were identified, and FTIR analysis confirmed the formation of polymeric anhydrides as intermediate products of CCE thermal decomposition.…”

Section: Resultssupporting

confidence: 85%

“…The second step up to 282.1 °C (maximum decomposition rate at 237.8 °C) with a mass loss of 11.1% can be assigned to the water elimination between two neighboring carboxylic groups with the creation of some polyacrylic cyclic anhydrides by intermolecular dehydration (5-atom ring such as succinic anhydride type or 6-atom ring such as glutaric anhydride type, Scheme 2 ). The third step up to 446.2 °C (maximum decomposition rate as much as 16.8%/min at 416.2 °C) with a mass loss of 58.4% is the most intense transformation in this experiment, and this is a decarboxylation process of the previously dehydrated structure (polyanhydride decomposition through decarboxylation and elimination of CO 2 and CO) [ 61 , 62 , 63 , 64 , 65 ]. The last decomposition step up to 503.8 °C corresponded to the oxidative degradation (combustion) of polymeric matrix when oxygen (~20.8% volume) interacts with the hydrocarbon chain and its degradation products.…”

Section: Resultsmentioning

confidence: 99%

“…A mass loss of as much as 21.0% (maximum decomposition rate at 285.0 °C) indicated that for G/H, the changes taking place went beyond water elimination between two neighboring carboxylic groups with the creation of some polyacrylic cyclic anhydrides by intramolecular dehydration, as in the case of M/H. The intermolecular dehydration probability with the isobutyric anhydride formation ( Scheme 2 ) resulted from the compact structure of the dry gel matrix and the proximity of polymer chains [ 62 , 64 , 65 ].…”

Section: Resultsmentioning

confidence: 99%

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Copper Rich Composite Materials Based on Carboxylic Cation Exchangers and Their Thermal Transformation

et al. 2021

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The effect of a cupric deposit (Cu2+, CuO) on the thermal decomposition of carboxylic cation exchangers (CCEs) is not known, and such studies may have practical significance. CCEs have a very high ion exchange capacity, so an exceptionally large amount of CuO (which is a catalyst) can be precipitated inside them. Two CCEs, macroreticular (Amberlite IRC50) and gel-like (Amberlite IRC86), served as a polymeric support to obtain copper-rich hybrid ion exchangers. Composites with CuO particles inside a polyacrylic matrix (up to 35.0 wt% Cu) were obtained. Thermal analyses under air and under N2 were performed for CCEs in the H+ and Cu2+ form with and without a CuO deposit. The results of sixteen experiments are discussed based on the TG/DTG curves and XRD patterns of the solid residues. Under air, the cupric deposit shifted the particular transformations and the ultimate polymeric matter decomposition (combustion) toward lower temperatures (even about 100–150 °C). Under N2, the reduction of the cupric deposit to metallic copper took place. Unique composite materials enriched in carbonaceous matter were obtained, as the products of polymeric matrix decomposition (free radicals and hydrogen) created an additional amount of carbon char due to the utilization of a certain amount of hydrogen to reduce Cu (II) to Cu0.

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Section: Resultssupporting

confidence: 85%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Copper Rich Composite Materials Based on Carboxylic Cation Exchangers and Their Thermal Transformation

et al. 2021

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“…The next step is the same profile for all, the maximum rate was observed at 293.8 °C, 298.7 °C, and 297.9 °C for CA#2, CA#3, and CA#4 respectively with loss percent around 21.34%, 30.51%, and 25% respectively. This stage is assigned to depolymerization, cleavage of the crosslinking bonds (i.e., around 120 °C), and degradation of functional groups (i.e., amines and hydroxyls)(around 180 °C) [ 59 , 60 ].…”

Section: Resultsmentioning

confidence: 99%

Synthesis of Eco-Friendly Biopolymer, Alginate-Chitosan Composite to Adsorb the Heavy Metals, Cd(II) and Pb(II) from Contaminated Effluents

Hamza

Hamad

et al. 2021

Materials

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Efficient removal of Cd(II) and Pb(II) from contaminated water is considered a fundamental point of view. Synthetic hydrogel biopolymers based on chitosan and alginate (cost-effective and eco-friendly) were successfully designed and characterized by highly efficient removal contaminants. The sorbents are characterized by FTIR, SEM-EDX, TGA, XPS analyses and textural properties which are qualified by N2 adsorption. The sorption properties are firstly investigated by the effect of pH, sorption isotherms, uptake kinetics, and selectivity from multi-metal solution with equi-molar concentration. The sorbent with 1:3 ratios (of chitosan and alginate respectively) is the most effective for metal removal (i.e., 0.81 mmol Cd g−1 and 0.41 mmol Pb g−1). Langmuir and Sip’s models fitted better the adsorption isotherms compared to the Freundlich model. Uptake kinetics was well fitted by pseudo-first-order rate equation, while the saturation was achieved within 40 min. The sorbent shows good reproducibility through duplicate the experiments with negligible decreasing efficiency (>2.5%). The sorbent was applied for water treatment on samples collected from the industrial area (i.e., 653 and 203 times over the MCL for Cd(II) and Pb(II) respectively according to WHO). The concentration of Cd and Pb was drastically decreased in the effluents as pH increased with removal efficiency up to 99% for both elements at pH 5.8 and SD equivalent 1 g L−1 for 5 h.

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“…17,18 The other important object is to characterize the resin. 19 Fig. 6 and 7 show the TG-DTG of bTEPRs and S-bTEPRs, respectively.…”

Section: Characteristics Of the Productsmentioning

confidence: 99%

Recycling of waste printed circuit boards into ion exchange resin

et al. 2015

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Recycling the nonmetal components of waste printed circuit boards (WPCBs), mainly thermosetting epoxy resins (TEPRs), is quite difficult because they are insoluble and inflexible. We report a new method to convert TEPRs into ion exchange resin by treatment with sulphuric acid and the equilibrium ion exchange capacity (IEC) of the produced sample is 1.63 meq g À1 . FTIR indicated that TEPRs were modified by sulphuric acid and X-ray photoelectron spectroscopy (XPS) verified that sulfonic acid group (-SO 3 À ) was introduced. The produced ion exchange resin was stable up to 200 C by TG-DTG analysis. The maximum adsorption capacities for Cu(II) and Ca(II) were 23.30 and 56.27 mg g À1 , respectively. The Langmuir model gave a better fit for adsorption than the Freundlich model. The activation energies (E a ) were 21.18 and 48.53 kJ mol À1 for Cu(II) and Ca(II), respectively, with pseudo-second-order kinetics.

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The study of non-isothermal degradation of acrylic ion-exchange resins

Cited by 3 publications

References 0 publications

Copper Rich Composite Materials Based on Carboxylic Cation Exchangers and Their Thermal Transformation

Copper Rich Composite Materials Based on Carboxylic Cation Exchangers and Their Thermal Transformation

Synthesis of Eco-Friendly Biopolymer, Alginate-Chitosan Composite to Adsorb the Heavy Metals, Cd(II) and Pb(II) from Contaminated Effluents

Recycling of waste printed circuit boards into ion exchange resin

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