三维电解法处理苯酚废水的粒子电极研究

用浸渍法制备了分别以Cu、Zn、Ni、Ce、Fe、Co、Mn、Sn等为单组分以及Mn和Sn为双组分氧化物、以γ-Al₂O₃为载体的负载型电催化剂, 并填充于阴阳极间以构成三维电极电催化降解苯酚模拟废水.结果表明, 所选用的几种粒子电极都显示了一定的催化活性, 可不同程度地提高苯酚的去除效率, 其中Mn、Sn单组分和双组分氧化物对苯酚降解具有较高的催化活性, 且Mn与Sn物质的量比为2时双组分金属氧化物的催化活性最高. 在0.25 A的电流下处理150 min, 可使目标有机物的去除率达90.8%, TOC去除率也达到80.7%. 加入·OH清除剂叔丁醇的研究表明, 本体系中苯酚的电催化氧化是由直接氧化和间接氧化的协同作用共同去除.

Preparation of Particle-Electrodes for Treating Phenol Wastewater Using Three-Dimensional Electrolysis

In order to effectively degrade phenol, various catalysts with different active metals, i.e. Cu, Zn, Ni, Ce, Fe, Co, Mn and Sn supported over gamma-Al2O3 used as three-dimensional electrodes were prepared by the incipient wetness impregnation. It is shown that, all particle-electrodes of single oxide and composite oxides could improve the degradation of phenol in varying degrees, and the single oxide and complex oxides of Mn and Sn could greatly improve electrochemical oxidation efficiency. When Mn and Sn ratio is 2 (molar fraction), the electrocatalytic activity is highest. Under current of 0.25 A, the conversion rate and total organic carbon (TOC) removal efficiency for model pollutant after 150 min treatment reach 90.8% and 80.7%, respectively. Electrocatalytic oxidation is further carried out in the presence of the *OH radical scavenger tert-butyl alcohol, which indicates that both direct and indirect oxidation are responsible for the degradation of phenol.