2D/2D Ti_(3)C_(2) MXene/HTiNbO_(5) nanosheets Schottky heterojunction for boosting photothermal-assisted solar-driven photodegradation of tetracycline hydrochloride  

作　　者：Wen Xiao Huan Yu Chenghao Xu Zhongyi Pu Xiangyu Cheng Fang Yu Chao Liu Qinfang Zhang Zhigang Zou 

机构地区：[1]School of Materials Science and Engineering,Yancheng Institute of Technology,Yancheng 224051,China [2]Jiangsu Provincial Key Laboratory of Eco-Environmental Materials,Yancheng Institute of Technology,Yancheng 224051,China [3]Eco-Materials and Renewable Energy Research Centre(ERERC),Nanjing University,Nanjing 210093,China

出　　处：《Journal of Materials Science & Technology》2024年第13期193-206,共14页材料科学技术（英文版）

基　　金：National Natural Science Foundation of China(Nos.51902282 and 12274361);Qinglan Project of Jiangsu of China,the Natural Science Foundation of Jiangsu Province(No.BK20211361);College Natural Science Research Project of Jiangsu Province(No.20KJA430004).

摘　　要：Developing high-efficiency photocatalysts for tetracycline hydrochloride(TCH)degradation is of great sig-nificance to ecosystems and human beings.In this work,a two-step process of exfoliation and re-stacking was performed to prepare re-stacked HTiNbO_(5) nanosheets(R-HTNS)and then coupled with Ti_(3)C_(2) MXene to construct Ti_(3)C_(2) MXene/R-HTNS(MX/RTS)with a 2D/2D Schottky heterojunction.These 2D/2D het-erostructures between Ti_(3)C_(2) MXene and R-HTNS can produce an internal electric field and provide max-imum interface area for efficient charge transfer across the intimate interface.The photocatalytic perfor-mance of samples was evaluated by TCH degradation under simulated sunlight.The MX/RTS composites,with an optimal sample of 3-MX/RTS,show enhanced photocatalytic activity for TCH degradation com-pared with R-HTNS.The characterization results reveal that the introduction of Ti_(3)C_(2) MXene can signif-icantly increase specific surface area for providing more reactive sites and broaden the light absorption region.Besides,the incident light energy is absorbed by the Ti_(3)C_(2) MXene component in MX/RTS compos-ites to generate photothermal energy(heat),which facilitates the charge carrier separation and surface reaction kinetics.Thus,the enhanced TCH photodegradation activity for MX/RTS composites is due to the introduction of Ti_(3)C_(2) MXene,which possesses the synergistic effect of the increased specific surface area,improved light-harvesting capacity,2D/2D Schottky heterojunction,and photothermal energy effect.Additionally,the TCH photodegradation behavior is deliberated with a detailed discussion on various co-existing ions.During TCH photodegradation,the active radical species are determined for 3-MX/RTS.Ac-cording to the characterization results,the possible TCH photodegradation pathway and mechanism over 3-MX/RTS are explored.This work may offer a novel insight for constructing MXene-based heterostruc-tured photocatalysts with high efficiency.

关 键 词：HTiNbO_(5) Ti_(3)C_(2)MXene Schottky heterojunction PHOTODEGRADATION Phototherma 

分 类 号：O643.36[理学—物理化学] O644.1[理学—化学]