Fabrication of g-C3N4/PW12/TiO2 composite with significantly enhanced photocatalytic performance under visible light
Fabrication of g-C3N4/PW12/TiO2 composite with significantly enhanced photocatalytic performance under visible light
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可见光下光催化性能显着增强的g-C3N4/PW12/TiO2复合材料的制备
DOI：
10.1016/j.jallcom.2020.157924
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发表时间：
2020-11
影响因子：
6.2
通讯作者：
Yangguang Li
中科院分区：
文献类型：
--
作者：
Feihong Shi;Tingting Zhao;Jiabo Wang;Yueting Wang;Zhe Chen;Baolei Liu;Haifeng Ji;Weidong Wang;Gunglei Zhang;Yangguang Li
探索和开发高效、持久的可见光环境修复催化剂是当前最具挑战性的课题之一。在此基础上，采用静电纺丝/煅烧技术制备了g-C3N4/PW12/TiO2（CN/PT-X; X = 3.2, 6和9）复合光催化剂。在复合材料中，g- c3n4生长在PW12/ tio2纳米纤维上形成三维纳米纤维网络，在制备过程中通过调节尿素与PW12/ tio2的质量比来控制g- c3n4的质量。x射线光电子能谱（XPS）结果证实了g- c3n4与PW12/TiO2之间的界面相互作用，表明两者之间形成了异质结。光催化实验表明，在可见光（λ > ~ 420 nm）照射下，CN/PT复合材料对四环素（TC）、双酚A （BPA）和还原Cr（VI）具有显著稳定的光催化性能。此外，CN/PT-6样品表现出最佳的催化活性，速率常数分别为0.03443 min−1（TC）、0.00712 min−1（BPA）和0.025 min−1（Cr(VI)）。这种性能的增强可归因于可见光区的吸附增强、高比表面积和光致载流子的有效分离和转移。活性物种捕获试验和ESR测量验证了h+和·O2−对TC降解负责。基于带隙结构和自由基捕获测试，提出并讨论了光催化行为的机理。
The exploration and development of supernally effective and persistent visible-light-responsive catalysts for environment remediation is regarded as one of the most challenging topics at present. Herein, a new g-C3N4/PW12/TiO2(CN/PT-X; X = 3.2, 6 and 9) composite photocatalyst was fabricated through a convenient electrospinning/calcination technique, followed with thermal polymerization method. In the composite, the g-C3N4was grown on PW12/TiO2nanofibers forming 3D nanofibrous networks, in which the g-C3N4quality was simply operated by regulating quality ratios of urea to PW12/TiO2during preparation process. The X-ray photoelectron spectra (XPS) results confirmed the interfacial interaction between g-C3N4and PW12/TiO2, implying the heterojunction formation between the two components. The photocatalytic tests showed that the CN/PT composites exhibited remarkable and stable photocatalytic performance for removing tetracycline (TC), bisphenol A (BPA) and reduction of Cr(VI) with visible-light (λ > 420 nm) irradiation. Furthermore, the CN/PT-6 sample displayed the optimal catalytic activity with the rate constants of 0.03443 min−1(TC), 0.00712 min−1(BPA) and 0.025 min−1(Cr(VI)), respectively. The enhanced performance could be ascribed to the enhanced adsorption in visible-light region, high specific surface area, effective separation and transfer of photoinduced charge carriers. The active species capturing tests and ESR measurements verified that h+and ·O2−were answerable for TC degradation. The mechanism accounting for the observed photocatalytic behaviour was proposed and discussed based on the band gap structure and free radicals capture tests.
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影响因子：
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