[Deactivation mechanism of Pt anode in the process of electroxidation of p-chlorophenol].
Deactivation of Pt electrode in the process of electroxidation of p-chlorophenol (p-CP) was investigated using linear sweep voltammetry, LC/MS and spectrum analysis techniques. The experiment results indicated that Pt would lose its electro-catalytic activity soon because polymer formed at the electrode surface. The in-site IR spectra of Pt showed two weak absorption bands appeared at 1 200 and 1 800 cm(-1) during the oxidation of p-CP, which are characteristics of aromatic ether and carbonyl group, respectively. Increasing initial concentration of p-CP and pH value of solution would accelerate the deactivation speed of Pt. Acetonitrile lixivium for deactivated Pt was analyzed by LC/MS, and it was found that the polymers formed at the surface of Pt were some mixed compounds. The mechanism of polymerization includes the following ways: coupling reaction of organic radical each other; substituting reaction of organic radical with p-CP (or intermediates or small polymers).
Tong
Shao-Ping
SP
State Key Laboratory Breeding Base of Green Chemistry-Synthesis Technology, College of Chemical Engineering and Materials Science, Zhejiang University of Technology, Hangzhou 310032, China. sptong@zjut.edu.cn
Fei
Hui
H
Zhang
Tie-Ming
TM
Ma
Chun-An
CA
D002733:Chlorophenols / Q000737:chemistry*; D004563:Electrochemistry / Q000295:instrumentation / Q000379:methods*; D004566:Electrodes; D010084:Oxidation-Reduction; D010984:Platinum / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000737:chemistry*
D002733:Chlorophenols; D014874:Water Pollutants, Chemical; C029107:4-chlorophenol; D010984:Platinum