Synthesis and thermal decomposition of Cu(II)Zn(II) hydroxide nitrate mixed crystals

Markov, L. K.; Ioncheva, R.; Marinov, Marin Alexandrov; Ivanov, K.

doi:10.1016/0254-0584(90)90059-j

Cited by 14 publications

(8 citation statements)

References 17 publications

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“…Zn-Cu hydroxichloride-mixed crystals, (Cu 0.78 /Zn 0.22 ) 2 (OH) 3 Cl, were synthesized by method of continuous coprecipitation under standard conditions with pH = 7 [ 25 ]. Diluted solutions of zinc and copper chloride and sodium hydroxide were used.…”

Section: Methodsmentioning

confidence: 99%

Zinc Supplementation againstEimeria acervulina-Induced Oxidative Damage in Broiler Chickens

Georgieva

Gabrashanska

Koinarski

et al. 2011

Veterinary Medicine International

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This study was undertaken to determine the dietary supplements of Zn containing diet on the antioxidant status in chickens experimentally infected with Eimeria acervulina. The antioxidant status was monitored via determination of MDA concentrations and erythrocyte SOD and CAT activities, as well as vitamin E, vitamin C, Cu, and Zn in liver, muscle, and serum. The results showed increased MDA (P < .05), CAT (P < .001), and decreased SOD (P < .001) in the infected birds. Significant changes in Cu and Zn concentrations and dramatically reduction of vitamin C and E concentrations in the infected chickens were found. The observed deviations in the studied enzymes and nonenzymatic parameters evidence the occurrence of oxidative stress following the infection and impaired antioxidant status of chickens, infected with Eimeria acervulina. Our results proved the ameliorating role of CuZn(OH)3Cl (0.170 g per kg food) against Eimeria acervulina-induced oxidative damage in infected chickens.

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Section: Methodsmentioning

confidence: 99%

Zinc Supplementation againstEimeria acervulina-Induced Oxidative Damage in Broiler Chickens

Georgieva

Gabrashanska

Koinarski

et al. 2011

Veterinary Medicine International

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“…Simultaneously, the rest of carbonate decomposes during the crystallization of copper oxide and zinc oxide. Further heat treatment of the CuO and ZnO formed results in crystal growth through material transport and sintering together of the oxide crystals [28].…”

Section: Thermokinetic Analysismentioning

confidence: 99%

Thermokinetic investigation of binary Cu/Zn hydroxycarbonates as precursors for Cu/ZnO catalysts

et al. 2014

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A combination of thermogravimetric analysis (TG) and differential scanning calorimetry (DSC) coupled to mass spectrometry has been applied to study the thermal decomposition of Cu/Zn hydroxycarbonates, which are used as a precursor for the active methanol synthesis catalyst. Original TG and DSC profiles and results of a formal kinetic analysis of the calcination process are compared with transformations occurring in the solid phase, which has been studied by means of in-situ XRD. A series of hydroxycarbonate precursors with different Cu/Zn molar ratios (40/60, 60/40, 80/20) was synthesized under conditions reported as optimum for catalytic performance. The samples contain primarily two crystalline phases, aurichalcite (Cu,Zn) 5 (CO 3 ) 2 (OH) 6 and zincian malachite (Cu,Zn) 2 CO 3 (OH) 2 . At least four formal decomposition stages of CO 2 and H 2 O evolution cause the major mass loss in the TG experiments. The best-fit quality for the all studied samples was obtained for a four-step competitive reaction model. The experimental TG dependences are adequately described by the n-th order equation and 3D Jander diffusion equation. The effects of the gas flow, sample mass, and water transfer conditions on the reaction pathway were studied. The presence of H 2 O vapor in the reaction feed accelerates the decomposition and dramatically changes the reaction TG profile. The decomposition enthalpy of mixed Cu/Zn (80/20) hydroxycarbonate was determined, and the formation enthalpy of the decomposition intermediate, a carbonate-modified oxide, was calculated to be ΔH f 0 =-633.7±5.6 kJ/mol.

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“…Mixed crystals (Cu 0.78 Zn 0.22 ) 2 (OH) 3 Cl were synthesized by the method of continuous co-precipitation under standard conditions with a pH < 7 (Markov, 1987). Diluted solutions of zinc and copper chloride and sodium hydroxide were used.…”

Section: Methodsmentioning

confidence: 99%

Trace element levels in the liver of rats with acute and chronic fascioliasis and after treatment with zinc-copper hydroxochloride mixed crystals

Tsocheva-Gaitandjieva

Gabrashanska²,

Tepavitcharova³

2002

J. Helminthol.

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Quantities of trace elements including copper, zinc, cobalt, manganese and iron were investigated in the liver tissue of rats at the acute or chronic stages of fascioliasis following treatment with zinc-copper hydroxochloride mixed crystals. Oral dosing (with food) of zinc-copper mixed crystals to healthy rats increased zinc and copper levels in the liver and decreased the iron content compared with controls. Manganese and cobalt levels did not change significantly. Significant reductions in all trace elements except manganese occurred in the liver of rats with acute or chronic fascioliasis. Manganese levels were slightly increased in rats at the acute stage and slightly decreased in rats at the chronic stage of fascioliasis. The application of mixed zinc-copper crystals at the acute or chronic stages of fascioliasis lead to a restoration of zinc and copper levels and a slight reduction in the iron levels in liver tissue of rats. The beneficial effects of applied salts were more apparent in rats chronically infected with Fasciola hepatica.

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Synthesis and thermal decomposition of Cu(II)Zn(II) hydroxide nitrate mixed crystals

Cited by 14 publications

References 17 publications

Zinc Supplementation againstEimeria acervulina-Induced Oxidative Damage in Broiler Chickens

Zinc Supplementation againstEimeria acervulina-Induced Oxidative Damage in Broiler Chickens

Thermokinetic investigation of binary Cu/Zn hydroxycarbonates as precursors for Cu/ZnO catalysts

Trace element levels in the liver of rats with acute and chronic fascioliasis and after treatment with zinc-copper hydroxochloride mixed crystals

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