首页|2D/2D Ti3C2 MXene/HTiNbO5 nanosheets Schottky heterojunction for boosting photothermal-assisted solar-driven photodegradation of tetracycline hydrochloride
2D/2D Ti3C2 MXene/HTiNbO5 nanosheets Schottky heterojunction for boosting photothermal-assisted solar-driven photodegradation of tetracycline hydrochloride
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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 HTiNbO5 nanosheets(R-HTNS)and then coupled with Ti3C2 MXene to construct Ti3C2 MXene/R-HTNS(MX/RTS)with a 2D/2D Schottky heterojunction.These 2D/2D het-erostructures between Ti3C2 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 Ti3C2 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 Ti3C2 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 Ti3C2 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.
Wen Xiao、Huan Yu、Chenghao Xu、Zhongyi Pu、Xiangyu Cheng、Fang Yu、Chao Liu、Qinfang Zhang、Zhigang Zou
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School of Materials Science and Engineering,Yancheng Institute of Technology,Yancheng 224051,China
Jiangsu Provincial Key Laboratory of Eco-Environmental Materials,Yancheng Institute of Technology,Yancheng 224051,China
Eco-Materials and Renewable Energy Research Centre(ERERC),Nanjing University,Nanjing 210093,China
国家自然科学基金国家自然科学基金Qinglan Project of Jiangsu of China,the Natural Science Foundation of Jiangsu ProvinceCollege Natural Science Research Project of Jiangsu Province
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