Fe3O4 @ SPC类芬顿氧化降解苯酚

Fenton-like oxidative degradation of phenol over Fe3O4 @ SPC

摘要:

以钙基蒙脱石（Ca-MMT）为原料，采用一步层间模板法制备了四氧化三铁@硅柱撑蒙脱石催化材料（Fe3O4@SPC），通过XRD、FTIR、BET、SEM对材料的形貌、结构进行表征显示，Fe3O4@SPC具有d001=3.30 nm的晶面间距和4.47 nm的介孔，Fe3O4颗粒主要分散在SPC的外表面。以苯酚为降解目标污染物，考察了Fe3O4@SPC的催化活性和稳定性。结果表明，当苯酚质量浓度为100 mg/L，pH值为2.5，催化剂质量浓度为0.5 g/L，H2O2投加量为0.2 mL，反应时间为120 min时，苯酚的去除率为100％；催化剂经过5次循环使用后，苯酚的降解率依然保持在90%以上。通过GC-MS分析苯酚降解生成的中间体，结合叔丁醇淬灭实验，发现?OH氧化在非均相类芬顿催化氧化降解苯酚体系中起主导作用，推测了苯酚可能的降解路径。

Abstract:

The ferroferric oxide @ silicon pillared montmorillonite catalytic material (Fe3O4@SPC) was prepared by a one-step interlayer template method using calcium-based montmorillonite (Ca-MMT).The morphology and structure of the material were characterized by XRD, FTIR, BET and SEM. The results showed that Fe3O4@SPC has d001=3.30 nm large crystal plane spacing and 4.47 nm mesoporous aperture, and most of Fe3O4 particles were dispersed on the surface of SPC. The catalytic activity and stability of Fe3O4@SPC were evaluate with phenol. The optimized conditions were as follows: the mass concentration of phenol is 100 mg/L, the pH value is 3.5, the mass concentration of catalyst is 0.5 g/L, H2O2 dosage of 0.2 mL and the reaction time is 120 min, the degradation rate of phenol is 100%. The removal rate of phenol remained above 90% after the catalyst was recycled for 5 times. Tert-butyl alcohol quenching experiment, revealed that ?OH oxidation played a key role in heterogeneous Fenton-like catalytic oxidation degradation of phenol. And the possible degradation path of phenol was speculated by the intermediates of phenol degradation with GC-MS.