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Citation: TIAN Mei, WANG Jing, YANG Lijuan, ZHANG Xiaoxue. Electrocatalytic Degradation of p-Nitrophenol Affected by the Synergsic Effect of Cathode and Anode[J]. Chinese Journal of Applied Chemistry, ;2012, 29(11): 1286-1290. doi: 10.3724/SP.J.1095.2012.00551 shu

Electrocatalytic Degradation of p-Nitrophenol Affected by the Synergsic Effect of Cathode and Anode

TIAN Mei ^a,b,, ,
WANG Jing ^b ,
YANG Lijuan ^a ,
ZHANG Xiaoxue ^b

1.
a Laboratory of Physical Chemistry, Harbin University, Harbin 150080, China;
2.
b College of Chemistry and Materials, Heilongjiang University, Harbin 150080, China

Corresponding author: TIAN Mei,
Received Date: 12 December 2011
Available Online: 5 January 2012
Fund Project: 黑龙江省教育厅科学技术研究项目(11544031)资助 (11544031)

The electrocatalytic activity of Ti/PbO₂ anode for degradation of p-nitrophenol was studied with linear sweeping voltammetry and galvanostatic electrolysis.The electrocatalytic degradation pathway of p-nitrophenol was explored by HPLC analysis of the reaction mixture in the anodic oxidation and cathodic reduction processes.The results indicate that Ti/PbO₂ electrode can electrocatalyze the degradation of p-nitrophenol effectively.The conversion of the 1.0 mmol/L p-nitrophenol achieved 98.6% when the electrolysis was carried out for 240 min with a constant current of 40&×10^-3 A/cm² at 35℃.The pathway of the electrocatalytic oxidation degradation of p-nitrophenol is p-nitrophenol→hydroquinone and pyocatechol→benzoquinone→maleic acid→oxalic acid→CO₂ and H₂O.The main product of the first step is hydroquinone.The conversions of benzoquinone to maleic acid and maleic acid to oxalic acid are the rate determining steps of anodic oxidation process.The p-nitrophenol can be reduced at the cathode.The reduction products include p-aminophenol.In an electrolytic cell without diaphragm,the cathodic reduction product,p-aminophenol,can be oxidated easily at the anode.The synergsic effect of the cathode and anode speeds up the degradation of p-nitrophenol in an undivided electrolytic cell compared to an electrolytic cell with diaphragm.
- p-nitrophenol,
- electrocatalysis,
- degradation,
- synergsic effect,
- reaction pathway
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