Irikura Kallyni, Bocchi Nerilso, Rocha-Filho Romeu C, Biaggio Sonia R, Iniesta Jesús, Montiel Vicente
Departamento de Química, Universidade Federal de São Carlos, C.P. 676, 13560-970 São Carlos, SP, Brazil.
Departamento de Química, Universidade Federal de São Carlos, C.P. 676, 13560-970 São Carlos, SP, Brazil.
J Environ Manage. 2016 Dec 1;183:306-313. doi: 10.1016/j.jenvman.2016.08.061. Epub 2016 Sep 4.
The statistical Response Surface Methodology (RSM) is applied to investigate the effect of different parameters (current density, j, NaCl concentration, [NaCl], pH, and temperature, θ) and their interactions on the electrochemical degradation of the Acid Green (AG) 28 dye using a Ti/β-PbO2 or Ti-Pt/β-PbO2 anode in a filter-press reactor. LC/MS is employed to identify intermediate compounds. For both anodes, the best experimental conditions are j = 50 mA cm(-2), [NaCl] = 1.5 g L(-1), pH = 5, and θ = 25 °C. After 3 h of electrolysis, a dye solution treated under these conditions presents the following parameters: electric charge per unit volume of the electrolyzed solution required for 90% decolorization (Q(90)) of 0.34-0.37 A h L(-1), %COD removal of ∼100%, specific energy consumption of 18-20 kW h m(-3), and %TOC removal of 32-33%. No loss of the β-PbO2 film is observed during all the experiments. The β-PbO2 films present excellent stability for solutions with pH ≥ 5 ([Pb(2+)] < 0.5 mg L(-1)). Chloroform is the only volatile organic halo compound present in the treated solution under those optimized conditions. Hydroxylated anthraquinone derivatives, aromatic chloramines, and naphthoquinones are formed during the electrolyses. The Ti/β-PbO2 and Ti-Pt/β-PbO2 anodes show significantly better performance than a commercial DSA anode for the electrochemical degradation of the AG 28 dye. The Ti/β-PbO2 anode, prepared as described in this work, is an excellent option for the treatment of textile effluents because of its low cost of fabrication and good performance.
采用统计响应面法（RSM）研究了不同参数（电流密度j、NaCl浓度[NaCl]、pH值和温度θ）及其相互作用对在压滤式反应器中使用Ti/β-PbO₂或Ti-Pt/β-PbO₂阳极电化学降解酸性绿（AG）28染料的影响。采用液相色谱/质谱联用（LC/MS）鉴定中间化合物。对于两种阳极，最佳实验条件为j = 50 mA cm⁻²、[NaCl] = 1.5 g L⁻¹、pH = 5和θ = 25℃。电解3小时后，在这些条件下处理的染料溶液呈现以下参数：90%脱色（Q(90)）所需的单位体积电解溶液电荷量为0.34 - 0.37 A h L⁻¹、COD去除率约为100%、比能耗为18 - 20 kW h m⁻³、TOC去除率为32 - 33%。在所有实验过程中均未观察到β-PbO₂膜的损失。β-PbO₂膜在pH≥5（[Pb²⁺]<0.5 mg L⁻¹）的溶液中表现出优异的稳定性。氯仿是在那些优化条件下处理溶液中唯一存在的挥发性有机卤代化合物。电解过程中形成了羟基化蒽醌衍生物、芳香族氯胺和萘醌。对于AG 28染料的电化学降解，Ti/β-PbO₂和Ti-Pt/β-PbO₂阳极的性能明显优于商用DSA阳极。按照本工作所述制备的Ti/β-PbO₂阳极，因其制备成本低且性能良好，是处理纺织废水的极佳选择。
