Fe_(3)O_(4)@TiO_(2)核壳微球吸附-光催化联合去除四环素性能  

Removal of tetracycline by Fe_(3)O_(4)@TiO_(2) core-shell microsphere combined with adsorption-photocatalysis

作　　者：陈杰 李明明 刘治刚 姜海峰 金华 连丽丽 CHEN Jie;LI Ming-ming;LIU Zhi-gang;JIANG Hai-feng;JIN Hua;LIAN Li-li(Characterization and Analysis Center of Jilin Institute of Chemical Technology,Jilin 132022,China;School of Energy and Power Engineering,Northeast Electric Power University,Jilin 132012,China)

机构地区：[1]吉林化工学院分析测试中心,吉林吉林132022 [2]东北电力大学能源与动力工程学院,吉林吉林132012

出　　处：《化学研究与应用》2022年第8期1803-1812,共10页Chemical Research and Application

基　　金：吉林省科技发展计划项目(YDZJ202101ZYTS029)资助;国家自然科学基金(51902125)资助;吉林市科技发展计划项目(20210103092)资助;吉林省中青年科技创新创业卓越人才团队项目(20210509063RQ)资助。

摘　　要：针对传统光催化技术降解四环素废水周期长且催化剂难回收的问题,制备了集吸附-光催化-磁分离于一体的Fe_(3)O_(4)@TiO_(2)核壳微球,并探究了不同核壳组成的Fe_(3)O_(4)@TiO_(2)对四环素溶液的吸附和光催化双效去除性能。结果表明,所制备Fe_(3)O_(4)@TiO_(2)具有良好的核壳微球形貌,孔隙结构丰富,比表面积高达159.62 m^(2)·g^(-1)。当n(TiO_(2))∶n(Fe_(3)O_(4))为4∶1时,Fe_(3)O_(4)@TiO_(2)对四环素的去除效果最佳,其中,暗室吸附2 h去除率为63%,继续光降解3 h后,四环素整体去除率达到98%。机理研究表明,四环素在Fe_(3)O_(4)@TiO_(2)表面的吸附过程符合伪二级动力学模型,以化学吸附为主,光催化过程中h^(+)和·O^(2-)是主要活性物质,将吸附到表面的四环素分子有效降解,从而实现四环素的彻底去除。同时,反应结束后通过磁分离即可将Fe_(3)O_(4)@TiO_(2)催化剂回收,在废水治理领域展现了良好的应用前景。In view of the long cycle and difficult recovery of catalyst in the degradation of tetracycline wastewater by traditional photocatalytic technology,the adsorption-photocatalytic-magnetic separation Fe_(3)O_(4)@TiO_(2) core-shell microspheres were prepared,and the adsorption and photocatalytic dual-effect removal of tetracycline solution by Fe_(3)O_(4)@TiO_(2) microspheres with different core-shell compositions were investigated.The results showed that the prepared Fe_(3)O_(4)@TiO_(2) sample presented obvious core-shell microsphere morphology,rich mesoporous structure,and the specific surface area was up to 159.62 m^(2)·g^(-1).When n(TiO_(2))∶n(Fe_(3)O_(4))was 4∶1,the removal efficiency of tetracycline was the best.After dark room adsorption for 2 h,the removal rate was 63% and then after photodegradation for 3 h,the overall removal rate of tetracycline was 98%.The mechanism study showed that the adsorption process of tetracycline on Fe_(3)O_(4)@TiO_(2) surface conforms to the pseudo-second-order kinetics model and is dominated by chemical adsorp-tion,while h^(+)and·O_(2)^(-)were the main active substances in the photocatalytic process,which can further effectively degrade the tetra-cycline molecules adsorbed on the surface and achieve the complete removal of tetracycline.At the same time,the Fe_(3)O_(4)@TiO_(2) cat-alyst can be recovered by magnetic separation after the reaction,which has a good application prospect in the field of wastewater treatment.

关 键 词：Fe_(3)O_(4)@TiO_(2) 吸附 光催化 四环素 磁性 

分 类 号：O614.8[理学—无机化学]