Co/Fe类水滑石活化过硫酸盐降解苯酚特性

Properties of phenol degradation by Co/Fe layered double hydroxides ac-tivated persulfate

摘要:

采用共沉淀法制备了Co/Fe类水滑石（Co/Fe-LDHs），焙烧后得到了焙烧态Co/Fe类水滑石（Co/Fe-LDO），通过XRD、SEM、BET、XPS等手段对样品的晶体结构及表面形貌进行了表征，考察了其活化过硫酸盐降解苯酚的影响因素及机理。结果表明，焙烧可使类水滑石比表面积从41.2 m2/g增大至56.8 m2/g，孔体积从0.2 cm3/g增大至0.3 cm3/g，增强了对过硫酸盐的活化性能。在反应时间30.0 min，反应温度25.0℃，过硫酸钠投加量为0.2 g/L，Co/Fe-LDO投加量为0.2 g/L，pH为6.0，初始苯酚浓度为100.0 mg/L时，苯酚降解率可达90.1%。 Co/Fe-LDO活化过硫酸钠降解苯酚反应过程中SO4−•和•OH起主要作用。

Abstract:

Co/Fe layered double hydroxides (Co/Fe-LDHs) was prepared by coprecipitation method, and calcined Co/Fe layered double hydroxides（Co/Fe-LDO） was obtained after calcination. The structure and properties of Co/Fe-LDHs and Co/Fe-LDO were characterized by XRD, SEM, BET and XPS. The in-fluencing factors and mechanism of phenol degradation by Co/Fe-LDHs or Co/Fe-LDO activated persul-fate were studied．The results show that the specific surface area is increased from 41.2 to 56.8 m2/g and pore volume is increased from 0.2 to 0.3 cm3/g by calcined method, so the activation ability of persulfate is significantly improved. As reaction time was 30.0 min, reaction temperature was 25.0 °C, dosage of Per-sulfatewas 0.2 g/L, dosage of Co/Fe-LDO was 0.2 g/L, pH was 6.0 and initial phenol concentration was 100.0 mg/L, the phenol degradation rate reached 90.1%. The phenol degradation of persulfate activation by Co/Fe-LDO mainly due to SO4−• and •OH.