非晶态Pd-P/聚吡咯/泡沫Ni电极对五氯苯酚的催化还原

Amorphous Pd-P/Polypyrrole/Foam Ni Electrode:Electrocatalytic Hydrodechlorination of Pentachlorophenol

电催化还原氯代有机物具有效率高和环境友好等优点。研究采用电化学沉积法在泡沫Ni上制备了非晶态Pd-P/聚吡咯/泡沫Ni(Pd-P/PPy/foam Ni)复合电极,用于电催化还原法去除水中的五氯苯酚(PCP)。扫描电镜(SEM)、透射电镜(TEM)、X射线衍射分析(XRD)和X射线光电子能谱分析(XPS)等表征结果表明,掺杂P使Pd催化剂分散均匀,粒径变小,且由晶态结构转变为非晶态。由电催化还原PCP发现,掺杂P明显提高了电极的催化活性。在n(Pd)/n(P)为1:3,Pd负载量为0.15 mg/cm^2,H2SO4浓度为0.2 mol/L,阴极电位为–1.2 V条件下,处理180 min后,PCP的降解率达到90.8%。另外,Pd-P/PPy/foam Ni电极重复使用8次,仍保持良好的稳定性。

Electrocatalytic hydrodechlorination technology possesses great potential in the field of chlorinated organic compound treatment due to the high efficiency,environmental friendliness,etc.The amorphous Pd-P/polypyrrole(PPy)/foam Ni electrode was prepared by electrochemical deposition for electrochemical hydrodechlorination of the pentachlorophenol(PCP).Morphology and chemical structure of Pd-P on the PPy/foam Ni electrode was investigated by the Scanning Electron Microscope(SEM),Transmission Electron Microscope(TEM),X-ray diffraction analysis(XRD),and X-ray photoelectron spectroscope(XPS).The result indicated that the Pd-P catalyst was evenly dispersed on the PPy/foam Ni electrode with small particles and changed from crystalline state to amorphous state.The electrocatalytic reduction of PCP certificated that the doping of P significantly increased the catalytic activity of the electrode.The degradation efficiency of PCP reached 90.8%after electrocatalytic reduction for 180 min under the condition of n(Pd)/n(P)=1:3,Pd loading=0.15 mg/cm^2,CH2SO4=0.20 mol/L and Vcathode=−1.2 V.In addition,the Pd-P/PPy/foam Ni electrode exhibited high electrocatalytic stability after reused for 8 times without any notable deactivation.