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Preparation and thermal analysis of synthetic malachite CuCO3·Cu(OH)2

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Abstract

The synthesis of malachite CuCO3·Cu(OH)2 or Cu2CO3(OH)2 was studied through titrations of copper(II) salt solutions with a solution of sodium carbonate at different temperatures. The precipitates were characterized by TG, IR and chemical analysis. The composition varies depending on thepH of the solution and the temperature. Purer malachite was synthesized by simple mixing of a solution of copper(II) nitrate or sulfate with a solution of sodium carbonate at 50°C.

The kinetics of the thermal decomposition of synthetic malachite was described by eitherR 3 orA m(m=1.2–1.4) law, according to TG analysis, both isothermal and nonisothermal. The Arrhenius parameters determined using three different integral methods showed the kinetic compensation effect, which is correlated to the working temperature interval analyzed.

Zusammenfassung

Mittels der Titration von Kupfer(II)-salzlösungen mit einer Natriumcarbonatlösung bei verschiedenen Temperaturen wurde die Synthese von Malachit CuCO3Cu(OH)2 bzw. Cu2CO3Cu(OH)2 untersucht. Die Niederschläge wurden mittels TG, IR und Elementaranalyse beschrieben. Die Zusammensetzung ändert sich mit dempH-Wert der Lösung und der Temperatur.Ein reineres Malachit erhält man bei einfachem Vermengen einer Lösung von Kupfer(II)-nitrat oder -sulfat mit einer Natriumcarbonatlösung bei 50°C.

Die Kinetik der thermischen Zersetzung von synthetischem Malachit wurde entsprechend der TG-Analyse (sowohl isotherm als auch nichtisotherm) entweder durch dasR 3- oder dasA m-Gesetz (m=1.2–1.4) beschrieben. Die unter Zuhilfenahme von drei verschiedenen Integrationsmethoden ermittelten Arrheniusschen Parameter zeigten den kinetischen Kompensationseffekt, der auf den untersuchten Arbeitstemperaturbereich bezogen wurde.

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Authors and Affiliations

  1. Chemistry Laboratory, Faculty of School Education, Hiroshima University, Shinonome, Minamiku, 734, Hiroshima, Japan

    H. Tanaka & M. Yamane

Authors
  1. H. Tanaka
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  2. M. Yamane
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Additional information

The authors thank Mr. H. Takemoto for analyzing kinetics of the thermal decomposition of synthetic malachite.

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Tanaka, H., Yamane, M. Preparation and thermal analysis of synthetic malachite CuCO3·Cu(OH)2 . Journal of Thermal Analysis 38, 627–633 (1992). https://doi.org/10.1007/BF01979390

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