超声波/零价铁协同降解苯酚的研究

研究了超声波/零价铁协同降解苯酚的过程,并对其降解机理进行了研究,分别考察了零价铁投加量,溶液初始浓度,初始pH值,超声功率等因素对苯酚降解的影响规律。结果表明,超声波/零价铁工艺能有效的降解水中的苯酚,零价铁的最佳投加量为0.8 g/L,苯酚浓度越低处理效果越好,苯酚在酸性条件的降解率高于碱性条件,在0~400 W超声作用下,功率越大,降解率越大;超声波与零价铁粉对苯酚的降解具有协同作用,其降解过程符合一级动力学规律。在体系中加入自由基捕获剂正丁醇抑制了苯酚的降解,说明苯酚的降解过程主要依靠羟基自由基(.OH)的氧化作用。

Degradation of Phenol by Ultrasound/Zero-valent Iron System

Degradation process and degradation mechanism of phenol were studied in the ultrasound/zero-valent iron(US/Fe0)system.Effect of Fe0 dosage,solution initial concentration,initial pH value,ultrasonic power and other factors on phenol degradation were studied.Experimental results showed that degradation efficiency of phenol reached the maximum in water when Fe0 dosage was 0.8 g/L.When initial concentration of phenol was lower,removal efficiency of phenol was better.With ultrasonic power 0~400 W,the degradation rate of phenol went faster.The synergistic effects existed between ultrasound and zero-valent iron,and degradation of phenol by US/Fe0 followed first-order kinetics.Degradation efficiency of phenol could be restrained with the addition of hydroxyl radical capture(n-butanol),which showed that phenol was degraded mainly by hydroxyl oxidation in US/Fe0 system.