Details

Autor(en) / Beteiligte

• Dulman, Viorica
• Ignat, Maurusa-Elena
• Bunia, Ion

Titel

Decolorization of ammonium lignosulfonate with H^sub 2^O^sub 2^/Cu(II) heterogeneous catalyst

Ist Teil von

• Journal of environmental science and health. Part A, Toxic/hazardous substances & environmental engineering, 2011-10, Vol.46 (12), p.1366

Ort / Verlag

Philadelphia: Taylor & Francis Ltd

Erscheinungsjahr

2011

Quelle

Taylor & Francis

Beschreibungen/Notizen

• 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...O... 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... (ProQuest: ... denotes formulae/symbols omitted.)