PbO_2复合电极预处理甲苯二胺废水

通过涂覆—热分解法与电沉积法制备了β-PbO_2/α-PbO_2/SnO_2-Sb2O3/Ti复合电极(PbO_2复合电极),采用X射线衍射(XRD)、扫描电子显微镜(SEM)、循环伏安法(CV)、线性极化法(LSV)和加速寿命试验对电极进行表征。将PbO_2复合电极用于处理甲苯二胺(TDA)废水,考察了电解质浓度、电流密度对TDA降解效果的影响。实验结果表明:α-PbO_2呈梭状,β-PbO_2呈花菜状,多层结构的PbO_2电极利于提高电极的稳定性和活性;PbO_2复合电极的析氧电位(1.9 V)明显高于TDA的氧化电位(1.28 V),其使用寿命长达486 d;在电流密度为60 m A/cm2、Na2SO4质量浓度为10 g/L、电解时间为240 min的条件下,对COD为4 791.74 mg/L、TDA质量浓度为486.4mg/L的废水进行处理,TDA去除率高达97.3%,COD去除率可达88.1%。

Pretreatment of toluene diamine wastewater using PbO2 composite electrode

The β-PbO₂/α-PbO₂/SnO₂-Sb₂O₃/Ti composite electrode（PbO₂ composite electrode）was prepared by coating-thermal deposition and electrochemical deposition and characterized by XRD,SEM,cyclic voltammetry（CV）,linear sweep voltammetry（LSV）and accelerated life test. The composite electrode was applied to treat the toluene diamine（TDA）wastewater,and the effects of electrolyte concentration and current density on TDA degradation were investigated. The experimental results showed that：The multilayer-structure PbO₂ with shuttle-shaped α-PbO₂ and cauliflower-shaped β-PbO₂ was conducive to improve the stability and activity of composite electrode;The oxygen evolution potential of the composite PbO₂ electrode（1.9 V）was obviously higher than that of TDA（1.28 V）,and its service life was up to 486 d;The TDA wastewater with 4 791.74 mg/L of COD and 486.4 mg/L of TDA mass concentration was treated by electrocatalytic technology,under the conditions of current density 60 mA/cm²,Na₂SO₄ mass concentration 10 g/L and reaction time 240 min,the removal rate of TDA and COD was 97.3% and 88.1%,respectively.