关键词: 纳米粒子, 电化学, 催化（作用）, 电流密度, 聚丙烯酰胺, 降低黏度

Abstract:

Nanometer MnO₂-PVA /GP composite electrodes were prepared by a simple coating method using the soluble polyvinyl alcohol and nano-MnO₂ catalyst. The morphology, composition and electrochemical properties on the electrode surfaces were analyzed by FTIR, SEM and cyclic voltammetry(CV). The composite electrodes were fully covered with a smooth PVA surface layer where MnO₂ nanoparticles were tightly embed. The nano-MnO₂ particles were spherical γ-type crystals with the mean diameter of 15—20nm and thus high electrocatalytic activity. The composite electrodes presented a multilayer structures containing graphite paper as substrate electrode, PVA adsorption layer and nano-MnO₂ catalytic region, and had been applied for electrochemically degrading high viscosity polyacrylamide(PAM) solution from EOR(enhanced oil recovery) process. The influences of solution pH, current density and electrolyte concentrations were investigated on the electrocatalytic PAM degradation. The results showed that the degradation performances of PAM using the composite electrodes were better than those of graphite electrode and nano-MnO₂ catalysis. The viscosity reduction of PAM solution were optimally achieved up to 90.2% using the composite electrodes within 2.0h under current density of 10mA/cm², pH=7.0, 0.3mol/L sodium sulfate solution. The novel multifunctional electrodes had encouraged suitable alternatives to apply electrocatalysis for reducing viscosity and recycling polyacrylamide wastewater with the water resource conservations in oil production technology.

Key words: nanoparticles, electrochemistry, catalysis, current density, polyacrylamide, viscosity reduction