Fabrication of MXene-derived TiO_(2)/Ti_(3)C_(2)integrated with a ZnS heterostructure and their synergistic effect on the enhanced photocatalytic degradation of tetracycline  

作　　者：Seongju Lee Kamakshaiah Charyulu Devarayapalli Bolam Kim Youngsu Lim Dae Sung Lee 

机构地区：[1]Department of Environmental Engineering,Kyungpook National University,80 Daehak-ro,Buk-gu,Daegu 41566,Republic of Korea

出　　处：《Journal of Materials Science & Technology》2024年第31期186-199,共14页材料科学技术(英文版)

基　　金：supported by the Basic Science Research Program through the National Research Foundation of Korea(NRF),funded by the Ministry of Education(No.NRF-2018R1A6A1A03024962);the Ministry of Science and ICT(No.NRF-2020R1A2C2100746).

摘　　要：Developing innovative photocatalysts for the efficient degradation of pharmaceutical pollutants is crucial in environmental remediation.In this study,we investigate the synthesis of TiO_(2)nanosheets derived from MXene,specifically integrated onto highly conductive Ti_(3)C_(2)MXene,and subsequently combined with zinc sulfide(ZnS)to form a heterojunction.This integration process is accomplished using a hydrothermal approach followed by a self-assembly method.We aim to assess the effectiveness of this integrated system in enhancing the photocatalytic degradation of tetracycline(TC).TiO_(2)/Ti_(3)C_(2)(TT)synthesized in situ exhibits high-energy lattice facets(001)of TiO_(2)nanosheets,thereby contributing to an exclusive heterojunction within the TiO_(2)/Ti_(3)C_(2)/ZnS(ZTT)heterostructure.The loading of ZnS nanoparticles significantly increases the surface area with a narrow band gap,enhancing the potential for light emission within the visible region.Consequently,ZnS synergistically affects the ZTTx(where x=wt%of ZnS on TT)heterostructure matrix,notably promoting the separation and transfer abilities of the photogenerated carriers.The ZTT5 heterostructure exhibits remarkable adsorption and photoreduction efficiencies,achieving a 97.1%TC removal in 60 min under UV light.Moreover,under simulated solar light,the ZTT5 heterostructure exhibits an impressive TC removal rate of∼93.8%in 90 min.These results highlight the effective performance of the ZTT5 heterojunction catalyst in facilitating photogenerated charge carriers,leading to improved photocatalytic capabilities.Furthermore,the band structure and density of states of TiO_(2)(101),Ti_(3)C_(2)(002),and ZnS(111)were investigated using density functional theory.In addition,a photoreduction mechanism was proposed for TC,involving the transfer of electrons from TiO_(2)to the MXene surface.After the transfer,the electrons react with O_(2)to generate•O_(2)-,attributed to the high electron mobility of MXene.The results of this study emphasize the significant potential

关 键 词：PHOTOCATALYST MXene Adsorption PHOTOREDUCTION TETRACYCLINE 

分 类 号：TB3[一般工业技术—材料科学与工程]