规整化铁碳材料的制备及降解高浓度苯酚的研究

Preparation of Iron-Carbon Micro-Electrolysis Materials with Normalization and Its Performance for Degradation of Phenol

以高浓度苯酚为研究对象,以还原铁粉、活性炭和膨润土为原料,通过高温微孔活化技术制备了一种规整化铁碳填料(Fe/C-BM)。采用SEM、XRD对其反应前后的表观形貌和晶体结构进行了表征,并考察了填料投加量,苯酚初始浓度,初始pH和曝气量对苯酚去除效果的影响,结果显示微电解反应前的Fe/C-BM填料表面凹凸不平,具有一定的孔隙结构。Fe/C-BM填料中铁以Fe^(0)和Fe_(2)O_(3)两种形式存在;反应后填料表面呈花纹状,其产物为Fe^(0)氧化后生成新的Fe_(2)O_(3)。曝气条件对微电解效果影响显著,酸性和中性溶液中去除效果优于碱性。当铁碳投加量在30 g/L,苯酚初始质量浓度为250 mg/L,初始pH=6.5,曝气量为2.4 L/min时,微电解120 min去除了83.6%的苯酚。

In this paper,a structured Fe-carbon filler(Fe/C-BM)was prepared by high concentration phenol,reduced iron powder,activated carbon and bentonite as raw materials by high-temperature micropore activation technology.The results of SEM and XRD showed that the surface of Fe/C-BM filler before microelectrolysis was uneven and had a rich pore structure.In Fe/C-BM packing,the exists in the form of Fe^(0) and Fe_(2)O_(3).After the reaction,a flower-like Fe_(2)O_(3) is formed on the filler surface,and the peak intensity of SiO_(2) increases,because the iron on the carbon surface of the filler is consumed after the reaction.The effects of filler dosage,initial concentration of phenol,initial pH and aeration volume on the removal effect of phenol were investigated.The results showed that the aeration conditions had a significant effect on the microelectrolysis,and the removal effect in acidic and neutral solutions was better than that in alkaline solutions.When the iron-carbon dosage was 30 g/L,the initial phenol concentration was 250 mg/L,the initial pH was 6.5,and the aeration volume was 2.4 L/min,83.6%phenol was removed by microelectrolysis for 120 min.