Enhanced photodegradation of tetracycline hydrochloride by hexameric AgBr/Zn-Al MMO S-scheme heterojunction photocatalysts: Low metal leaching, degradation mechanism and intermediates
Enhanced photodegradation of tetracycline hydrochloride by hexameric AgBr/Zn-Al MMO S-scheme heterojunction photocatalysts: Low metal leaching, degradation mechanism and intermediates
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DOI：
10.1016/j.cej.2022.137371
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发表时间：
2022-06
影响因子：
15.1
通讯作者：
Jiang Zheng;Changzheng Fan;Xiaoming Li;Qi Yang;Dong-bo Wang;Abing Duan;J. Ding;Sheng-Song Rong
中科院分区：
文献类型：
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作者：
Jiang Zheng;Changzheng Fan;Xiaoming Li;Qi Yang;Dong-bo Wang;Abing Duan;J. Ding;Sheng-Song Rong
采用简化水热共沉淀法制备了新型六方AgBr/Zn-Al MMO s型光催化剂。所制备的光催化体系在降解盐酸四环素（TC）方面表现出优异的光催化性能。其中，ABMO0.2/Vis体系在可见光照射60 min内的TC去除率最高（95%）。经过4次循环后，光催化性能没有明显下降，银离子的浸出得到了有效控制。优异的光催化性能可归因于独特的形态结构与S-scheme异质结电荷转移机制之间的协同作用，因为这种协同作用增强了光生载体的光吸收能力和分离效率以及氧化还原能力。此外，液相色谱-质谱（LC-MS）分析明确了TC的矿化行为和详细的分解途径。这项工作为设计高效的s型异质结开辟了新的途径，并为抗生素的光催化降解机制提供了新的见解。
A novel hexagonal AgBr/Zn-Al MMO S-scheme photocatalyst was prepared by adopting a simplified hydrothermal and co-precipitation method. The prepared photocatalytic system exhibited excellent photocatalytic performance in degradation of tetracycline hydrochloride (TC). In particular, the ABMO0.2/Vis system generated the best TC removal rate (95%) within 60 min of visible light irradiation. Moreover, no significant decrease of the photocatalytic performance had been observed after four cycles, while the leaching of silver ions was effectively controlled. The excellent photocatalytic performance can be attributed to the synergistic effect occurring between the unique morphological structure and the S-scheme heterojunction charge transfer mechanism, since that that synergistic effect enhanced light absorption capacity and separation efficiency of the photogenerated carriers and the redox ability. In addition, liquid chromatography-mass spectrometry (LC-MS) analysis clarified the mineralization behavior and detailed decomposition pathways of TC. This work opens a new pathway for the design of efficient S-scheme heterojunctions and provides new insights into the photocatalytic degradation mechanism of antibiotics.