Synthesis of chromium-containing pigments from chromium recovered from leather waste |
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Authors: | Berry Frank J Costantini Nicola Smart Lesley E |
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Affiliation: | Department of Chemistry, The Open University, Milton Keynes, UK. |
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Abstract: | Cobalt-chromite green and chrome-tin pink pigments have been prepared from chromium extracted from leather shavings produced as a waste product of the leather-tanning industry. The alkaline agent (NaOH, CaO, MgO, NH4OH) used in the extraction process influences the nature of the final product. The effect of the NH4OH:CaO ratio on the final product in the case of cobalt-chromite green was examined. The pigments obtained were characterized by FT-IR and X-ray diffraction (XRD). Colour measurements were compared with those recorded from materials prepared from pure Cr2O3. The leaching of Cr(VI) from the materials was examined by UV spectroscopy. |
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