Electro-polymerization fabrication of PANI@GF electrode and its energy-effective electrocatalytic performance in electro-Fenton process

doi:10.1016/S1872-2067(16)62525-1

Abstract

Abstract:

An energy-effective polyaniline coated graphite felt (PANI@GF) composite cathode for the elec-tro-Fenton (E-Fenton) process was synthesized through an electro-polymerization method. The electrocatalytic activity of the cathode for the 2e-ORR process was investigated and dimethyl phthalate (DMP) was used as a model substrate to evaluate its performance in the E-Fenton process. The as-prepared PANI@GF composite possessed a three-dimensional porous structure, which is favorable for O₂ diffusion, while the large amount of N atoms in the conductive polyaniline (PANI) enhanced 2e-ORR reactivity. The DMP degradation of the E-Fenton system using PANI@GF was significantly enhanced owing to the improvement in ORR performance. The apparent kinetic constant for DMP degradation was 0.0753 min^-1, five times larger than that of GF. The optimal carbonization temperature and polymerization time for the preparation of the PANI@GF composite cathode was found to be 900℃ and 1 h, respectively. Measurement conditions are a crucial factor for proper evaluation of cathode electrocatalytic performance. Accordingly, the O₂ flow rate, Fe²⁺ concentration, and pH for DMP degradation were optimized at 0.4 L/min, 1.0 mmol/L, and 3.0, respectively. These results indicate that the present PANI@GF composite cathode is energy-effective and promising for potential use as an E-Fenton system cathode for the removal of organic pollutants in wastewater.

Key words: Electrocatalysis, Oxygen reduction reaction, Electro-polymerization, Electro-Fenton, Dimethyl phthalate degradation

Jinli Yu, Tianfu Liu, Haiyue Liu, Yi Wang. Electro-polymerization fabrication of PANI@GF electrode and its energy-effective electrocatalytic performance in electro-Fenton process[J]. Chinese Journal of Catalysis, 2016, 37(12): 2079-2085.

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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(16)62525-1

https://www.cjcatal.com/EN/Y2016/V37/I12/2079

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