An Effective Electrochemical Cr(VI) Removal Contained in Electroplating Industry Wastewater and the Chemical Characterization of the Sludge Produced
| Autor: | Carlos Barrera-Díaz, Ivonne Linares-Hernández, Bryan Bilyeu, Sarai Velazquez-Peña, S. A. Martínez-Delgadillo |
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| Rok vydání: | 2011 |
| Předmět: |
Chemistry
General Chemical Engineering Metallurgy Reduction rate General Chemistry Electrolyte Electrochemistry Industrial and Manufacturing Engineering Cathode law.invention Metal chemistry.chemical_compound Wastewater law visual_art visual_art.visual_art_medium Hexavalent chromium Electroplating Nuclear chemistry |
| Zdroj: | Industrial & Engineering Chemistry Research. 51:5905-5910 |
| ISSN: | 1520-5045 0888-5885 |
| DOI: | 10.1021/ie200968s |
| Popis: | The goal of this work is to optimize the electrochemical reduction of hexavalent chromium in electroplating wastewater. The pH, electrolyte composition and concentration, and cathode metal were varied and the effect on reduction rate measured. Although all electrochemical systems studied reduced all Cr(VI) in the solutions, there were clear trends in the speed of the reactions. Because the reaction at pH 2 was faster than that at pH 4, acidity is favored. Higher electrolyte concentrations produced faster rates. Copper cathodes were faster than iron ones. Using the optimized conditions of pH 2 and a copper cathode, along with the high electrolyte concentration already present, actual electroplating wastewater was treated. The rate of Cr(VI) reduction was measured as a function of treatment time and was found to be even higher than that of the synthetic solutions. The 180 mg/L of Cr(VI) in the wastewater was completely reduced in about 15 min under optimal conditions. The sludge generated in the process was... |
| Databáze: | OpenAIRE |
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