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

doi:10.15541/jim20190582

Abstract

Abstract:

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, C_H2SO4=0.20 mol/L and V_cathode=-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.

Key words: Pd-P/PPy/foam Ni electrode, amorphous, electrocatalytic reduction

CLC Number:

TQ174

WANG Jing, CUI Chunyue, TIAN Xia, ZHANG Xue, WANG Ying, XIN Yanjun. Amorphous Pd-P/Polypyrrole/Foam Ni Electrode: Electrocatalytic Hydrodechlorination of Pentachlorophenol[J]. Journal of Inorganic Materials, 2020, 35(10): 1157-1162.

Figures/Tables 9

Fig. 1 SEM and TEM (insets) images of Pd/PPy/foam Ni (a) and Pd-P/PPy/foam Ni (b) Pd loading: 0.15 mg/cm2, n(Pd) : n(P) = 1 : 3

Fig. 2 XRD patterns of Pd/PPy/foam Ni and Pd-P/PPy/foam Ni

Fig. 3 HR-TEM images and correponding SAED patterns of Pd/PPy/foam Ni (a) and Pd-P/PPy/foam Ni (b)

Fig. 4 XPS spectra of Pd-P/PPy/foam Ni (a); Pd3d survey scan spectra of Pd/PPy/foam Ni and Pd-P/PPy/foam Ni (b)

Fig. 5 Linear voltammetry curves of PPy/foam Ni, Pd/PPy/ foam Ni and Pd-P/PPy/foam Ni

Fig. 6 Effect of molar ratio between Pd and P on the dechlorination of PCP in water

Fig. 7 Effects of cathode potential on degradation of PCP (n(Pd) : n(P)=1 : 3, anolyte: 0.2 mol/L H2SO4, Na2SO4 concentration: 0.10 mol/L)

Fig. 8 Effect of Na2SO4 concentration on degradation of PCP (n(Pd) : n(P)=1 : 3, cathode potential -1.2 V, H2SO4 concentration: 0.20 mol/L)

Fig. 9 Relationship between the degradation efficiency of PCP and cycling number (n(Pd) : n(P)=1 : 3, H2SO4 concentration: 0.20 mol/L, Cathode potential: -1.2 V)

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