Template-free synthesis of core-shell Fe_(3)O_(4)@MoS_(2)@mesoporous TiO_(2) magnetic photocatalyst for wastewater treatment  

作　　者：Jingshu Yuan Yao Zhang Xiaoyan Zhang Liang Zhao Hanlin Shen Shengen Zhang 

机构地区：[1]Institute for Advanced Materials and Technology,University of Science and Technology Beijing,Beijing 100083,China [2]Xi’an Fanyi University,Xi’an 710105,China [3]Civil and Environmental Engineering,Michigan State University,East Lansing,MI 48824,USA

出　　处：《International Journal of Minerals,Metallurgy and Materials》2023年第1期177-191,共15页矿物冶金与材料学报（英文版）

基　　金：financially supported by the National Key R & D Projects (Nos. 2021YFC1910504, 2019YFC1907101, 2019YFC1907103, and 2017YFB0702304);the Key R & D Project in Ningxia Hui Autonomous Region, China (No. 2020BCE01001);the Key and Normal Projects National Natural Science Foundation of China (Nos. U2002212 and 51672024);the Xijiang Innovation and Entrepreneurship Team (No. 2017A0109004);the Fundamental Research Funds for the Central Universities (Nos. FRF-BD-20-24A, FRF-TP-20-031A1, FRF-IC-19-017Z, FRF-GF-19-032B, and 06500141);the Integration of Green Key Process Systems MIIT, Natural Science Foundation of Beijing Municipality (No. 2214073);the Guangdong Basic and Applied Research Foundation, China (No. 2020A1515110408);the Foshan Science and Technology Innovation Special Foundation, China (No. BK21BE002);the Postdoctor Research Foundation of Shunde Graduate School of University of Science and Technology Beijing (No. 2020BH004)

摘　　要：TiO_(2)is the dominant and most widely researched photocatalyst for environmental remediation,however,the drawbacks,such as only responding to UV light(<5%of sunlight),low charge separation efficiency,and difficulties in recycling,have severely hindered its practical application.Herein,we synthesized magnetically separable Fe_(3)O_(4)@MoS_(2)@mesoporous TiO_(2)(FMmT)photocatalysts via a simple,green,and template-free solvothermal method combined with ultrasonic hydrolysis.It is found that FMmT possesses a high specific surface area(55.09 m2·g−1),enhanced visible-light responsiveness(~521 nm),and remarkable photogenerated charge separation efficiency.In addition,the photocatalytic degradation efficiencies of FMmT for methylene blue(MB),rhodamine B(RhB),and tetracycline(TC)are 99.4%,98.5%,and 89.3%within 300 min,respectively.The corresponding degradation rates are 4.5,4.3,and 3.1 times higher than those of pure TiO_(2)separately.Owing to the high saturation magnetization(43.1 A·m^(2)·kg^(−1)),FMmT can achieve effective recycling with an applied magnetic field.The improved photocatalytic activity is closely related to the effective transport of photogenerated electrons by the active interlayer MoS_(2) and the electron–hole separation caused by the MoS_(2)@TiO_(2)heterojunction.Meanwhile,the excellent light-harvesting ability and abundant reactive sites of the mesoporous TiO_(2)shell further boost the photocatalytic efficiency of FMmT.This work provides a new approach and some experimental basis for the design and performance improvement of magnetic photocatalysts by innovatively incorporating MoS2 as the active interlayer and integrating it with a mesoporous shell.

关 键 词：CORE-SHELL MoS2 mesoporous TiO2 photocatalytic degradation heterojunction magnetic recycling 

分 类 号：X701[环境科学与工程—环境工程] O643.36[理学—物理化学]