Authors : Falah K. Matloub, Muataz Mohammed Sulaiman and Zaid Nidhal Shareef
Abstract: The removal of the chromium from spent tannery solution was carried out by electrochemical technique in order to minimize the pollution problem of tanning process activity using platinum as anodic electrode and iron, aluminum, nickel and copper as cathodic electrode. The volume of cell was 250 cm3. A treated synthetic bath solution contains 12.87 g/L of Cr (OH)SO4. The current density range was (1.5-3.5) A.dm-2 and the temperature (25-45)°C. Three organic acids (formic acid, citric acid and acetic acid) were used as additives to improve electro deposition. The removal percent is determined by using atomic absorption spectrophotometer. The best removal of chromium is 97.11% after 4 h, the best temperature is 35°C and the best current is 3.5 A.dm-2. The powder obtained from the deposits on the cathode was analyzed by X-ray diffractometer, differential scanning calorimetry and fourier transform infrared. They were shown that the powder was composed of Cr2O3 after heating. The chromium electro-deposition takes place because of the formation of active chromium-carbamid complexes. The complex compounds were expected as formate, citrate and acetate of chromium.
Falah K. Matloub, Muataz Mohammed Sulaiman and Zaid Nidhal Shareef, 2018. Investigation and Optimization of Electrochemical Deposition Approach Used for Recovery of Chromium from Tanning Wastewater. Journal of Engineering and Applied Sciences, 13: 10306-10312.