Co/Fe类水滑石活化过硫酸钠降解苯酚特性  

Degradation of phenol by Co/Fe layered double hydroxides activated sodium persulfate

作　　者：程爱华[1] 张燕妮 CHENG Aihua;ZHANG Yanni(School of Geology and Environment,Xi'an University of Science and Technology,Xi'an 710054,Shaanxi,China)

机构地区：[1]西安科技大学地质与环境学院,陕西西安710054

出　　处：《精细化工》2020年第6期1253-1258,共6页Fine Chemicals

基　　金：国家自然科学基金项目(51278418)。

摘　　要：采用共沉淀法制备Co/Fe类水滑石(Co/Fe-LDHs),焙烧后得到焙烧态Co/Fe类水滑石(Co/Fe-LDO)。通过XRD、SEM、BET和XPS对样品的晶体结构及表面形貌进行表征。考察了其活化过硫酸钠(PS)降解苯酚的影响因素及机理。结果表明,焙烧可使Co/Fe-LDHs形成复合金属氧化物Co/Fe-LDO。比表面积从41.2 m^2/g增大至56.8 m^2/g,孔体积从0.2 cm^3/g增大至0.3 cm^3/g,增强了样品对过PS活化性能。在反应时间30 min、反应温度25.0℃、PS投加量为0.2 g/L、Co/Fe-LDO投加量为0.2 g/L、溶液pH 6.0、苯酚初始质量浓度100.0 mg/L时,苯酚降解率可达90.1%。机理分析表明,SO4^-·和·OH在Co/Fe-LDO活化PS降解苯酚反应过程中起主要作用。Co/Fe layered double hydroxides(Co/Fe-LDHs)was prepared by coprecipitation method and then calcined to form Co/Fe layered double hydroxides(Co/Fe-LDO).The crystalline structure and morphology of the samples were characterized by XRD,SEM,BET and XPS.The influencing factors and mechanism of phenol degradation by Co/Fe-LDHs or Co/Fe-LDO activated sodium persulfate(PS)were investigated.The results showed that calcination made Co/Fe-LDHs transform mixed metal oxides Co/Fe-LDO.After calcination,the specific surface area of the sample increased from 41.2 m^2/g to 56.8 m^2/g,and the pore volume increased from 0.2 cm^3/g to 0.3 cm^3/g.In addition,the activation ability of Co/Fe-LDO to PS was higher than that of Co/Fe-LDHs.Under the conditions of reaction time 30 min,reaction temperature 25.0℃,dosage of PS 0.2 g/L,dosage of Co/Fe-LDO 0.2 g/L,pH of solution 6.0,and initial phenol mass concentration 100.0 mg/L,the degradation rate of phenol reached 90.1%.The mechanism analysis revealed that SO4^-·and·OH played an important role in the process of phenol degradation by CO/Fe LDO activated PS.

关 键 词：类水滑石 钴 铁 活化 过硫酸钠 苯酚 水处理技术 

分 类 号：TB332[一般工业技术—材料科学与工程] X703.1[环境科学与工程—环境工程]