基于油菜花粉模板制备Fe基复合材料及其催化特性

Preparation of Fe-based Composites Based on Rape Pollen Template and Their Catalytic Properties

以油菜花粉为生物模板,采用共沉淀-焙烧法制备了Fe基复合材料活化过硫酸盐降解苯酚。采用X射线衍射(XRD)、扫描电子显微镜(SEM)和比表面积分析仪(BET)对Fe基复合材料进行表征分析。以苯酚为目标污染物,考察了催化剂投加量、过硫酸盐投加量、初始pH和苯酚浓度对苯酚降解效果的影响。结果表明,Fe基复合材料活化过硫酸盐降解苯酚性能优良。在最佳反应条件(25℃,苯酚初始浓度为200 mg/L,催化剂投加量为3 g/L,过硫酸盐投加量为8.4 mmol/L)下,反应60 min苯酚的降解率可达91%。Fe基复合材料可通过磁性分离,易于回收,在较宽pH范围内均可活化过硫酸盐降解苯酚,重复使用三次后,苯酚的降解率仍可达81%,稳定性良好。Fe基复合材料通过Fe^(2+)及花粉模板残留的C及其官能团共同活化过硫酸盐产生SO_(4)·^(-)和HO·降解苯酚。

Using rape pollen as a biological template,Fe-based composites were prepared by coprecipitation-calcination method for phenol degradation by activated persulfate.The Fe-based composites were characterized by X-ray diffraction(XRD),scanning electron microscopy(SEM)and specific surface area analyzer(BET).Phenol as the target pollutant,the effects of catalyst dosage,persulfate dosage,initial pH and phenol concentration on the degradation of phenol were investigated.The results show that the Fe-based composites have excellent performance in the degradation of phenol by activating persulfate.Under the optimal reaction conditions(25℃,the initial concentration of phenol was 200 mg/L,the dosage of catalyst was 3 g/L,and the dosage of persulfate was 8.4 mmol/L),the degradation rate of phenol after the reaction for 60 min could be obtained up to 91%.The Fe-based composite material can be separated by magnetic separation and easy to recover.It can activate persulfate to degrade phenol in a wide pH range.After repeated use for 3 times,the degradation rate of phenol can still reach 81%,indicating that the Fe-based composite material is stable.Phenol is degraded through the Fe-based composites activated persulfate to produce SO_(4)·^(-)and HO·by Fe^(2+)and the residual C and its functional groups in the pollen template activated persulfate.