Ti/SnO2-IrO2电极的制备及其电化学降解对氯苯酚

电化学氧化法降解水中毒性有机物具有低碳、节能、清洁等优点,该技术的关键是开发高效、稳定、价格低廉的阳极。本文采用热分解法制备了Ti/SnO₂-IrO₂电极,对电极进行表征和电化学性能分析,并降解了对氯苯酚。考察不同因素(电流密度、目标污染物初始浓度、Cl^-浓度)对降解效果的影响。结果表明,Ti/SnO₂-IrO₂电极具有较长的寿命和良好的电化学性能。当电流密度为20 mA·cm^-2,对氯苯酚初始浓度为300 mg/L,Cl^-浓度为1 000 mg/L时,化学需氧量(COD)去除率可达89.02%,同时电极具有较低的能耗0.596 kWh·g^-1,表现出优异的催化性能。该电极具有一定的工业应用前景。

Preparation of Ti/SnO2-IrO2 Electrode and Its Electrochemical Degradation of p-Chlorophenol

Electrochemical oxidation has manifested great advantages of low carbon, energy saving and cleanliness on degradation of toxic organics in water. The key to this technology is the development of efficient, stable and inexpensive anodes. A Ti/SnO₂-IrO₂ electrode was prepared by facile thermal decomposition method. The morphology and elemental composition of the electrode were characterized and the electrochemical performance of the electrode was analyzed. Furthermore, the Ti/SnO₂-IrO₂ electrode was used to degrade p-chlorophenol, and the influence of various factors, including current density, initial concentration of p-chlorophenol, concentration of Cl^-, on the degradation effect was adequately investigated. The results show that the Ti/SnO₂-IrO₂ electrode has a long lifetime and good electrochemical performance. Especially, when the electrode is used to degrade p-chlorophenol at the current density of 20 mA·cm^-2, the initial p-chlorophenol concentration of 300 mg/L and the Cl^- concentration of 1 000 mg/L, the removal rate of chemical oxygen demand (COD) can reach up to 89.02% with a low energy consumption of 0.596 kWh·g^-1. The excellent electrocatalytic performance of the Ti/SnO₂-IrO₂ electrode indicates its promising prospect for industrial applications.