Preparation of a Novel Ternary Composite of TiO2/UiO-66-NH2/Graphene Oxide with Enhanced Photocatalytic Activities

Ling, Lianjie; Wang, Yang; Zhang, Wei; Ge, Zhimeng; Duan, Wubiao; Liu, Bo

doi:10.1007/s10562-018-2353-0

Cited by 31 publications

(16 citation statements)

References 42 publications

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“…On the other hand, the electrons from GO further migrate to the Pt and lead to the H 2 production. It is also possible that the electrons from RhB* can get directly injected into Pt and produce H 2 , as shown in Figure 17b [219]. Similarly, there have been other TiO 2 /MOFs-based photocatalytic systems reported [220][221][222][223][224][225].…”

Section: Metal-organic Framework-tio 2 Compositesmentioning

confidence: 87%

“…They have further proposed that the photocatalytic activity of TiO 2 /NH 2 -UiO-66 nanocomposites was mainly ruled out by (i) the concentration of TiO 2 , (ii) the effective charge separation characteristics of NH 2 -UiO-66, and (iii) the enhanced availability of charge carriers at the interface of the TiO 2 /NH 2 -UiO-66 system. Ling et al have synthesized a ternary nanocomposite composed of TiO 2 /UiO-66-NH 2 /graphene oxide and studied towards the photocatalytic dye (RhB) degradation and H 2 evolution [219]. They have reported that, under the visible excitation, the electrons tend to transfer from RhB* to CB of MOFs to CB of TiO 2 due to the cascading potential of these systems.…”

Section: Metal-organic Framework-tio 2 Compositesmentioning

confidence: 99%

“…Photocatalytic charge transfer process in (a) TiO 2 /NH 2 -UiO-66 for CO 2 reduction and (b) TiO 2 /NH 2 -UiO-66/GO/Pt for dye removal and H 2 production (reproduced with permission from refs [218,219]…”

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confidence: 99%

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Insights into the TiO2-Based Photocatalytic Systems and Their Mechanisms

Sakar

Prakash

2019

Catalysts

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Photocatalysis is a multifunctional phenomenon that can be employed for energy applications such as H2 production, CO2 reduction into fuels, and environmental applications such as pollutant degradations, antibacterial disinfection, etc. In this direction, it is not an exaggerated fact that TiO2 is blooming in the field of photocatalysis, which is largely explored for various photocatalytic applications. The deeper understanding of TiO2 photocatalysis has led to the design of new photocatalytic materials with multiple functionalities. Accordingly, this paper exclusively reviews the recent developments in the modification of TiO2 photocatalyst towards the understanding of its photocatalytic mechanisms. These modifications generally involve the physical and chemical changes in TiO2 such as anisotropic structuring and integration with other metal oxides, plasmonic materials, carbon-based materials, etc. Such modifications essentially lead to the changes in the energy structure of TiO2 that largely boosts up the photocatalytic process via enhancing the band structure alignments, visible light absorption, carrier separation, and transportation in the system. For instance, the ability to align the band structure in TiO2 makes it suitable for multiple photocatalytic processes such as degradation of various pollutants, H2 production, CO2 conversion, etc. For these reasons, TiO2 can be realized as a prototypical photocatalyst, which paves ways to develop new photocatalytic materials in the field. In this context, this review paper sheds light into the emerging trends in TiO2 in terms of its modifications towards multifunctional photocatalytic applications.

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Section: Metal-organic Framework-tio 2 Compositesmentioning

confidence: 87%

Section: Metal-organic Framework-tio 2 Compositesmentioning

confidence: 99%

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Insights into the TiO2-Based Photocatalytic Systems and Their Mechanisms

Sakar

Prakash

2019

Catalysts

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“…The higher photodegradation efficiency was ascribed to the availability of more active photocatalyst surface for dye absorption, enhanced photoabsorption, and subsequent reactive oxygen species (ROS) generation [45]. This is because the existence of GO hinders the recombination of electron-hole pairs, enhances the absorption of MB, and widens the ultraviolet region range for catalysts [46,47]. In our study, the impurities on the surface of the catalyst were removed by calcination, and the size of the catalyst was reduced; however, when the temperature was too high, the small-sized catalysts were easy to agglomerate.…”

Section: Journal Of Nanomaterialsmentioning

confidence: 99%

Green Synthesis of ZnO-GO Composites for the Photocatalytic Degradation of Methylene Blue

Lin

Hong

Chen

et al. 2020

Journal of Nanomaterials

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Beneficial from the excellent optical performance of zinc oxide (ZnO) nanocrystals and the absorption properties of graphene oxide (GO), the nanocomposites of ZnO and GO with synergistic photocatalytic effects were prepared by a precipitation method, in which GO is utilized as the catalyst carrier. The prepared composites were characterized by X-ray diffraction, X-ray photoelectron spectroscopy, UV-vis spectroscopy, field emission scanning electron microscopy, and transmission electron microscopy and also performed photocatalytic activity for the nanocomposites. The results show that ZnO is uniformly loaded on the surface of GO assisted by an effective interface coupling. Due to interface coupling between ZnO and GO, electrons can be directly transferred from the valence band of ZnO to GO. The photodegradation efficiency of the composites reaches to 97.6%, and the first-order reaction rate constant of photodegradation is calculated to be 0.04401 min-1. The novel ZnO-GO composites with excellent photocatalytic performance display promising potential applications in the field of photocatalysis and will provide a new platform for building next-generation graphene-based semiconductor composites.

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“…Generally, the catalytic reaction promoted by the synergistic effect of Lewis acid and Brönsted acid, and the catalytic effect is related to the total calculated amount (Brönsted acid + Lewis acid). 43 Therefore, combining results in Figure 2 and Table S3 shows that when the total acid concentration was higher than 5.78 and the reaction temperature lower than 663 K, the catalytic effect of the iron-molybdenum-based catalyst was satisfactory. This also proved that the excessively high reaction temperature destroyed the on-surface structure and active sites of the catalyst affected catalytic activity products.…”

Section: Acidity Studymentioning

confidence: 87%

Effects of reaction conditions on one‐step synthesis of methylal via methanol oxidation catalyzed by Mo:Fe(2)/ HZSM ‐5 catalyst

et al. 2021

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In the process of one-step synthesis of methylal via methanol oxidation, the design and research of various dual-function catalysts are important and studies on the influence of reaction conditions on this type of process are scarce. We explored the influence of reaction temperature, reaction space velocity, and the feed ratio of methanol to air on the catalytic effect of the process based on the Fe-Mo-based bifunction catalyst and discovered the most appropriate reaction conditions for the process. Results showed that excessively high reaction temperatures were not conducive to the formation of target product Dimethoxymethane (DMM) and this was verified from the perspective of thermodynamic analysis. At the same time, through Brunaure Emmett Teller (BET), X-ray diffraction, scanning electron microscope, NH 3-temperatureprogrammed chemisorption, and Pyridine Fourier Infrared (PY-FTIR) characterization, analysis of the microstructure and surface characteristics of the catalyst showed that an excessively high reaction temperature caused accumulation of metal oxides on the catalyst surface to block pores and reduce the specific surface area. This also destroyed the active acidic sites on the catalyst surface and weakened the acidity of the catalyst, thereby reducing catalytic activity. Investigation showed that excessively high reaction space velocity caused most of the formaldehyde obtained by catalyzing the initial oxidative dehydrogenation to fail to undergo polycondensation with methanol after desorption in time to obtain DMM, leading to a significant decrease in DMM selectivity. Investigation of the methanol-air feed ratio showed that when CH 3 OH:air = 1.5, the methylal selectivity was highest and catalytic activity had improved. Orthogonal experiments showed that optimal reaction conditions of the process were 663 K, 15 000 h −1 and CH 3 OH: air = 0.82. In addition, compared with other bifunctional catalysts of this process, the self-made Mo:Fe(2)/HZSM-5 bifunctional catalyst exhibited high stability and carbon deposition resistance under severe operating conditions. Meng Yuan contributed to the work equally and should be regarded as co-first authors.

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Preparation of a Novel Ternary Composite of TiO2/UiO-66-NH2/Graphene Oxide with Enhanced Photocatalytic Activities

Cited by 31 publications

References 42 publications

Insights into the TiO2-Based Photocatalytic Systems and Their Mechanisms

Insights into the TiO2-Based Photocatalytic Systems and Their Mechanisms

Green Synthesis of ZnO-GO Composites for the Photocatalytic Degradation of Methylene Blue

Effects of reaction conditions on one‐step synthesis of methylal via methanol oxidation catalyzed by Mo:Fe(2)/ HZSM ‐5 catalyst

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