Decolorization of ammonium lignosulfonate with H(2)O(2)/Cu(II) heterogeneous catalyst
| Autor: | Ion Bunia, Maurusa-Elena Ignat, Viorica Dulman |
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| Rok vydání: | 2011 |
| Předmět: |
Thermogravimetric analysis
Environmental Engineering Aqueous solution Time Factors Ion exchange Polymers Inorganic chemistry Temperature Propylamine General Medicine Hydrogen Peroxide Hydrogen-Ion Concentration Heterogeneous catalysis Lignin Catalysis chemistry.chemical_compound chemistry Ammonium Hydrogen peroxide Copper |
| Zdroj: | Journal of environmental science and health. Part A, Toxic/hazardous substancesenvironmental engineering. 46(12) |
| ISSN: | 1532-4117 |
| Popis: | The potential of ammonium lignosulfonate (ALS) decolorization and degradation in aqueous solution was studied in a heterogeneous system using hydrogen peroxide and a Cu (II)-chelating ion exchanger. This was based on acrylic copolymers functionalized with N,N dimethylamino propylamine (DMAPA) as a catalyst. In order to optimize the efficiency of the system, the influence of such process parameters like H(2)O(2) concentration, pH, contact time, temperature, ALS concentration and catalyst amount were evaluated. The apparent rate constant of decolorization calculated from the absorbance data indicates that the process profiles follow pseudo-first order kinetics. Lignosulfonate degradation was furthermore studied by FTIR spectroscopy, thermogravimetric analysis and determination in phenolic compounds. The catalyst stability and reusability have also been investigated. Our experimental results clearly indicate that, under optimum conditions, the ammonium lignosulfonate solutions exhibit a total bleaching associated with degradation and significant mineralization to CO(2). |
| Databáze: | OpenAIRE |
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