Electrochemical degradation of the reactive red 141 dye on a β-PbO2 anode assessed by the response surface methodology

Journal of the Brazilian Chemical Society

São Carlos Federal University, São Carlos, Brazil¹  Bocchi, Nerilso¹  Aquino, José M.¹  Rocha-Filho, Romeu C.¹  Biaggio, Sonia R.¹ 

关键词: electrooxidation;    dye degradation;    Reactive-Red 141 dye;    PbO2 anode;    factorial design;   

DOI  :  10.1590/S0103-50532010000200019

学科分类：化学（综合）

来源: SciELO

【 摘 要 】

The electrochemical degradation of the Reactive Red 141 dye using a filter-press reactor with a β-PbO2 anode was investigated through the application of the response surface methodology. The charge required for 90% decolorization (Q90) and the chemical oxygen demand removal percentage after 30 min electrolysis (COD30) were used to model the system. The investigated independent variables were the current density, pH, NaCl concentration, and temperature. Low values of Q90 (0.2-0.3 A h L-1) were obtained at acidic conditions (pH 1-3) and high concentrations of NaCl (1.0-2.0 g L-1), when Cl2 and HOCl are the predominant oxidant species. The best values of COD30 were obtained at high current densities and acidic to neutral conditions (pH 5-7); however, the consequent energy consumption makes the process not economically feasible under these conditions. For strongly acidic solutions, specific energy consumptions associated to Q90 as low as 0.79 kW h m-3 were attained.

【 授权许可】

Unknown