Construction of g-C3N4/Bi4Ti3O12 hollow nanofibers with highly efficient visible-light-driven photocatalytic performance
Construction of g-C3N4/Bi4Ti3O12 hollow nanofibers with highly efficient visible-light-driven photocatalytic performance
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DOI：
10.1016/j.colsurfa.2020.126063
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发表时间：
2021-04
期刊：
影响因子：
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通讯作者：
Hongfei Shi;J. Fu;Wei Jiang;Yueting Wang;Baolei Liu;Junxing Liu;Hai-Yang Ji;Weidong Wang;
中科院分区：
文献类型：
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作者：
Hongfei Shi;J. Fu;Wei Jiang;Yueting Wang;Baolei Liu;Junxing Liu;Hai-Yang Ji;Weidong Wang;
探索和开发用于环境修复的有效且持久的可见光响应光催化剂被认为是当前最具挑战性的研究领域之一。本文采用静电纺丝/煅烧技术，通过热聚合制备了新型的g-C3 N4/Bi 4 Ti 3 O 12（CN/BTO-X; X = 6，9和10.8）空心纳米复合材料。扫描电镜和透射电镜观察表明，CN/BTO复合材料主要由中空的纳米颗粒组成，直径为110 ± 20 nm。XPS结果证实了BTO和CN之间的界面相互作用，这意味着这些组分之间形成异质结。光催化性能测试表明，该复合材料对RhB、MO、TC、Cr（VI）等多种污染物具有良好的光催化降解性能。可见光（λ > 420 nm）。其中CN/BTO-9的光催化性能最好，其光催化速率常数分别为0.03064 min-1（TC）、0.11274 min-1（RhB）、0.04474 min-1（MO）和0.01938 min-1（Cr（VI））。CN/BTO具有高的比表面积、良好的可见光吸收、氧化能力强、光生载流子分离效率高的异质结构以及独特的中空双相结构，是其优异的催化性能的主要原因。活性物种捕获实验和ESR测试证实了h+和dotO 2 −是RhB/TC降解的主要原因。根据能带结构、密度泛函理论计算和自由基捕获实验，对催化活性的机理进行了讨论。
The exploration and development of effective and persistent visible-light-responsive photocatalysts for environmental remediation is regarded as one of the most challenging current research areas. Herein, a novel g-C3N4/Bi4Ti3O12(CN/BTO-X; X = 6, 9 and 10.8) hollow nanofiber composite was fabricated through a convenient electrospinning/calcination technique, followed by thermal polymerisation. The SEM and TEM images showed that CN/BTO composite mainly comprised a hollow nanofiber morphology with a diameter of 110 ± 20 nm. The XPS result confirmed the interfacial interaction between BTO and CN, implying the formation of a heterojunction between these components. Photocatalytic measurements revealed that the as-synthesized CN/BTO composite exhibited excellent and stable photocatalytic behaviour of dislodging multiple pollutants (including RhB, MO, TC and Cr (VI) etc.) with visible light (λ > 420 nm). Among these prepared composites, the CN/BTO-9 sample exhibited the highest photocatalytic performance with the rate constants of 0.03064 min−1(TC), 0.11274 min–1(RhB), 0.04474 min–1(MO) and 0.01938 min–1(Cr(VI)), respectively. The outstanding catalytic performance was ascribed to the high specific surface area, improved visible-light adsorption, heterostructure of CN/BTO with strong oxidative ability and efficient separation of photoinduced charge carriers, and its unique hollow nanofiber structure. The active species-capturing experiments and ESR tests verified that h+andradical dotO2−were responsible for RhB/TC degradation. The mechanism accounting for the observed catalytic activities was discussed according to the band gap structure, DFT calculations and free radicals capture tests.