新型磁性可分离TiO_2的制备及其催化臭氧化苯酚  

Catalytic Ozonation of Phenol with Magnetic Separable Titania

作　　者：蔡国君[1,2] 朱晓莹 裘建平[2] 

机构地区：[1]台州市环境保护局,浙江台州318020 [2]浙江工业大学生物与环境工程学院,浙江杭州310032 [3]浙江省水利水电勘测设计院,浙江杭州310032

出　　处：《广东化工》2013年第12期237-238,共2页Guangdong Chemical Industry

基　　金：浙江省科技厅公益基金资助项目(2011C31041)

摘　　要：以磁性纳米材料Fe3O4为核心,外面包覆SiO2作为阻隔保护层,形成球状SiO2/Fe3O4磁核(SF),再以TiO2为活性物质,包覆于磁核外,制备出磁性可分离的TiO2包覆SiO2/Fe3O4臭氧催化剂(TSF)。采用X射线衍射(XRD)和振动样品磁强计(VSM)对其表征,并以苯酚为模型污染物,考察了催化剂的催化臭氧化活性。实验结果表明,所制备的催化剂具有良好的催化臭氧化去除苯酚的能力,苯酚初始浓度20 mg/L、反应温度为20℃、O3/O2投加量50 mL/min、TSF投加量1.0 g/L时,反应120 min后苯酚去除率可达82%,并且具有良好的磁分离效应。Shell/core type TiO2/SiO2/Fe3O4 nanoparticles （TSF） were synthesized, with Fe304 fine particles as cores distributing within the titania as shells, and silica as barrier layers between the magnetic cores and titania shells. The particles were characterized by using various experimental techniques such as X-ray diffraction （KRD） and vibration sample magnetometer （VSM）. Catalytic ozonation examination of the magnetic hybrid nanoparticles was carried out in phenol aqueous solutions in a glass cylindrical reactor. The experimental results showed that the catalyst has a high catalytic activity in the catalytic degradation of phenol, and up to 82 % of phenol removal was obtained at 20 ℃ after 120 min reaction with an initial phenol concentration of 20 mg/L, O3/O2 flow rate of 50 mL/min, and a catalyst dose of 1.0 g/L. The synthesized magnetic hybrid nanoparticles will find potential applications for cleaning polluted water with the help of magnetic separation.

关 键 词：磁性可分离二氧化钛 催化臭氧化 苯酚 

分 类 号：X703.1[环境科学与工程—环境工程]