Synthesis of chromium-containing pigments from chromium recovered from leather waste.
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.
D002857:Chromium / Q000737:chemistry / Q000302:isolation & purification*; D017608:Chromium Compounds / Q000737:chemistry / Q000302:isolation & purification*; D004396:Coloring Agents / Q000737:chemistry / Q000302:isolation & purification*; D003247:Conservation of Natural Resources; D007220:Industrial Waste; D017550:Spectroscopy, Fourier Transform Infrared; D014961:X-Ray Diffraction
D017608:Chromium Compounds; D004396:Coloring Agents; D007220:Industrial Waste; D002857:Chromium