摘要
采用磁性羰基铁颗粒作为载体,负载纳米TiO_(2)制成复合光催化剂,并对复合催化剂表面进行疏水亲油改性,制备得到具有疏水亲油特性的负载型纳米TiO_(2)复合光催化剂。采用X射线衍射仪(XRD)、扫描电子显微镜(SEM)、红外光谱仪(FTIR)和紫外-可见光谱仪(UV)等,表征了复合催化材料的晶相组成和微观形貌,评价了催化材料的疏水亲油性能、磁回收性能,对比研究了普通沸石负载型TiO_(2)催化剂和疏水改性羰基铁负载型TiO_(2)催化剂对三种石油烃污染物降解效果,并进一步考察了催化剂加载量和循环使用对石油烃降解效率的影响。结果表明,疏水改性羰基铁负载型TiO_(2)催化剂具有疏水亲油特性,可使得非极性石油烃类污染物能更好地与催化材料的活性位点接触,且由于催化材料颗粒具有磁性,在磁场作用下易于回收;新型催化材料对水中的石油烃类污染物具有更好的降解效率,常规TiO_(2)/沸石催化剂的光解效果对污染物的最大去除率为75%左右,而TiO_(2)/改性羰基铁的最大去除率可以达到95%,且降解速率更快,随着催化剂浓度的增加,降解效果提高,但当浓度进一步增加至4g·L^(-1)时,降解效果下降;在重复使用过程中,复合光催化材料活性降低不明显,说明复合催化材料的稳定性较好。
The magnetic carbonyl iron particles were used as the carrier and loaded with nano TiO_(2) to prepare composite photocatalysts,and the surface of the composite catalysts was hydrophobically and lipophilically modified to prepare the loaded nano TiO_(2) composite photocatalysts with hydrophobicity and lipophilicity characteristics,and the crystalline phase composition and microscopic morphology of the composite photocatalysts were characterized by X-ray diffraction(XRD),scanning electron microscopy(SEM),infrared spectroscopy(FTIR),and ultraviolet-visible spectroscopy(UV).The hydrophobic and lipophilic properties of the catalytic materials were evaluated,the magnetic recycling properties were evaluated.The degradation effects of the common zeolite-loaded TiO_(2) catalysts and the hydrophobically modified carbonyl iron loaded TiO_(2) catalysts were comparatively investigated on the three petroleum hydrocarbon pollutants,and the influences of the loading amount of the catalysts and recycling on the pollutants in water[J].CIESC Journal,2024,75(12):4555-4562 degradation efficiencies of the petroleum hydrocarbons were further examined.The results showed that the hydrophobically modified carbonyl iron loaded TiO_(2) catalyst has hydrophobic and lipophilic properties,which can make the non-polar petroleum hydrocarbon pollutants contact with the active sites of the catalytic material in a better way,and it is easy to be recycled under the magnetic field due to the magnetic nature of the catalytic material particles;the novel catalytic material has a better degradation efficiency of petroleum hydrocarbon pollutants in water,the maximum removal rate of the conventional TiO_(2)/zeolite catalysts for the pollutants was about 75%,while the maximum removal rate of TiO_(2)/modified carbonyl iron could reach 95%,and the degradation rate was faster.Degradation effect was improved with the increase of the catalyst concentration,but the degradation effect was decreased when the concentration was further increased to 4 g·L^(-1),During repeated use,the activity of the composite photocatalytic material does not decrease significantly,indicating that the composite catalytic material has good stability.
作者
吴云
龚海峰
WU Yun;GONG Haifeng(Engineering Research Center of the Ministry of Education for Waste Oil Recovery Technology and Equipment,Chongqing Technology and Business University,Chongqing 400067,China)
出处
《化工学报》
EI
CSCD
北大核心
2024年第12期4555-4562,共8页
CIESC Journal
基金
国家自然科学基金面上项目(51678095)
重庆市基础与前沿研究计划项目(cstc2016jcyjA0372)。
关键词
表面
载体
催化剂
光催化降解
石油烃
surface
support
catalyst
photocatalytic degradation
petroleum hydrocarbons
作者简介
第一作者/通信作者:吴云(1973-),男,博士,副研究员,wu.yun@ctbu.edu.cn。
