Preparation and Photocatalytic Performance of MgAl-LDHs/TiO2 Composite Photocatalyst

被引：0
|
作者：
Lin B. [1 ,2 ]
Xu Y. [1 ]
Yu D. [1 ,3 ]
机构：
[1] School of Civil Engineering and Architecture, NingboTech University, Zhejiang, Ningbo
[2] School of Civil Engineering, Chongqing Jiaotong University, Chongqing
[3] School of Civil Engineering and Architecture, Zhejiang University, Hangzhou
来源：
Cailiao Daobao/Materials Reports | 2023年 / 37卷 / 19期
关键词：
adsorption; first principles; LDHs; memory effect; photocatalysis; photocatalysis mechanism; synergistic effect;
D O I：
10.11896/cldb.22050098
中图分类号：
学科分类号：
摘要：
Based on the memory effect of hydrotalcite (LDHs), MgAl-LDHs/TiO2 composites were synthesized. The materials were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM)and photoluminescence spectroscopy (PL). Using methylene blue (MB)as degradation material, the photocatalytic performance of MgAl-LDHs/TiO2 under simulated sunlight was studied and the reaction conditions were optimized. Based on first principles theory, the band structure and state density of the composite system were calculated at atomic scale. The main active groups in the photocatalytic process were investigated and the possible photocatalytic reaction mechanism was proposed. The results showed that the agglomeration phenomenon of TiO2 in MgAl-LDHs/TiO2 composites was improved, the adsorption capacity of the composite was greatly enhanced, and the photocatalytic activity of the composite was significantly improved compared with that of TiO2. The degradation rate of methylene blue reached 95.3% within 40 min when the mass ratio of LDHs was 50% and the calcination temperature was 400 ℃. The main active groups in the photocatalytic reaction process are h+ and ·OH. The bandgap obtained by MgAl-LDHs/TiO2 simulation calculation is 1.67 eV which is an indirect bandgap semiconductor. The photoresponse principle is transferred from O 2p in VB to hybrid Ti 3d and Al 3p in CB. © 2023 Cailiao Daobaoshe/ Materials Review. All rights reserved.
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共 28 条
  • [1] Chang Q, Jiang G D, Hu M X, Et al., Environmental Science, 35, 5, (2014)
  • [2] Kusmierek K., Mechanisms& Catalysis, 119, (2016)
  • [3] He J Y, Jia Q M, Wu S S, Et al., New Chemical Materials, 42, 10, (2014)
  • [4] Kanan S, Moyet M A, Arthur R B, Et al., Catalysis Reviews, 62, 3, (2019)
  • [5] Komaraiah D, Radha E, Reddy M V R, Et al., Surface and Interface Analysis, 53, 2, (2020)
  • [6] Singh J, Juneja S, Soni RK, Et al., Journal of Colloid and Interface Science, 590, (2021)
  • [7] Li D Y, Zhang W T, Zhang C., Materials Review, 33, 23, (2019)
  • [8] Gong Y, Wang L L, Xu Y Q, Et al., Materials Review, 34, (2020)
  • [9] Jamil S, Alvi A R, Khan S R., Chemical Progress, 31, 2, (2019)
  • [10] Liao Y M, Yu J, Wei S Q, Et al., Environmental Science, 42, 1, (2021)
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