Microwave-assisted synthesis of Ag-doped MOFs-like organotitanium polymer with high activity in visible-light driven photocatalytic NO oxidization

In the present work, highly efficient and stable Au/CeO2-TiO2 photocatalysts were prepared by a microwave-assisted solution approach. The Au/CeO2-TiO2 composites with optimal molar ratio of Au/Ce/Ti of 0.004:0.1:1 delivered a remarkably high and stable NO conversion rate of 85% in a continuous flow reactor system under simulated solar light irradiation, which far exceeded the rate of 48% over pure TiO2. The tiny Au nanocrystals (∼1.1 nm) were well stabilized by CeO2 via strong metal-support bonding even it was subjected to calcinations at 550 °C for 6 h. These Au nanocrystals served as the very active sites for activating the molecule of nitric oxide and reducing the transmission time of the photogenerated electrons to accelerate O2 transforming to reactive oxygen species. Moreover, the Au-Ce(3+) interface formed and served as an anchoring site of O2 molecule. Then more adsorbed oxygen could react with photogenerated electrons on TiO2 surfaces to produce more superoxide radicals for NO oxidation, resulting in the improved efficiency. Meanwhile, O2 was also captured at the Au/TiO2 perimeter site and the NO molecules on TiO2 sites were initially delivered to the active perimeter site via diffusion on the TiO2 surface, where they assisted O-O bond dissociation and reacted with oxygen at these perimeter sites. Therefore, these finite Au nanocrystals can consecutively expose active sites for oxidizing NO. These synergistic effects created an efficient and stable system for breaking down NO pollutants. Furthermore, the excellent antisintering property of the catalyst will allow them for the potential application in photocatalytic treatment of high-temperature flue gas from power plant.

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“…Combining the previous work has been reported, 7,33,34,39 we suggested that the reaction pathway could be described as following:…”

Section: ■ Introductionmentioning

confidence: 90%

Highly Efficient and Stable Au/CeO₂–TiO₂ Photocatalyst for Nitric Oxide Abatement: Potential Application in Flue Gas Treatment

et al. 2015

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“…For this study, Qiao Sun et al modified the MIL-53(Fe) by adding Mn, Co, and Ni metal into the framework of MIL-53(Fe) material, which exhibited excellent catalytic performance in liquid-phase degradation of phenol [30]. Various rare-earth or transition metals that modify MOFs structures have recently been reported such as three-dimensional Ln(III)-Zn(II) heterometallic coordination polymers [31], Fe substituted Cr MIL-101 [32], Ag-doped MOF-like organotitanium polymer (Ag@NH2-MOP(Ti)) [33], Ti-doped UiO-66 [34], Eu substituted Fe MIL-53 [35], and Zn-Ln coordination polymers (Ln = Nd, Pr, Sm, Eu, Tb, Dy) [36].…”

Section: Introductionmentioning

confidence: 99%

Effective Photocatalytic Activity of Mixed Ni/Fe-Base Metal-Organic Framework under a Compact Fluorescent Daylight Lamp

Nguyen

Bạch

et al. 2018

Catalysts

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Mixed Ni/Fe-base metal-organic framework (Ni/Fe-MOF) with different molar ratios of Ni2+/Fe3+ have been successfully produced using an appropriate solvothermal router. Physicochemical properties of all samples were characterized using X-ray diffraction (XRD), Raman, field emission scanning electron microscopes (FE-SEM), fourier-transform infrared spectroscopy (FT-IR), N2 adsorption-desorption analysis, X-ray photoelectron spectroscopy (XPS), ultraviolet-visible diffuse reflectance spectra (UV-Vis DRS), and photoluminescence spectra (PL). The photocatalytic degradation performances of the photocatalysts were evaluated in the decomposition of rhodamine B (RhB) under a compact fluorescent daylight lamp. From XRD, IR, XPS, and Raman results, with the presence of mixed ion Fe3+ and Ni2+, MIL-88B (MIL standing for Materials of Institut Lavoisier) crystals based on the mixed metal Fe2NiO cluster were formed, while MIL-53(Fe) was formed with the presence of single ion Fe3+. From UV-Vis DRS results, Ni/Fe-MOF samples exhibited the absorption spectrum up to the visible region, and then they showed the high photocatalytic activity under visible light irradiation. A Ni/Fe-MOF sample with a Ni2+/Fe3+ molar ratio of 0.3 showed the highest photocatalytic degradation capacity of RhB, superior to that of the MIL-53(Fe) sample. The obtained result could be explained as a consequence of the large surface area with large pore volumes and pore size by the Ni2+ incorporating into the MOF’s structure. In addition, a mixed metal Fe/Ni-based framework consisted of mixed-metal cluster Fe2NiO with an electron transfer effect and may enhance the photocatalytic performance.

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“…On the other hand, modification of photocatalysts with noble metal nanoparticles (NMNPs) is also an effective approach to improve their visible light activity, owing to the surface plasmon resonance (SPR) effect of NMNPs enables the supported photocatalysts to absorb visible light [20][21]. Among different noble metals, gold (Au)…”

Section: Introductionmentioning

confidence: 99%

In-situ growth of Au and β-Bi2O3 nanoparticles on flower-like Bi2O2CO3: A multi-heterojunction photocatalyst with enhanced visible light responsive photocatalytic activity

Wang

et al. 2017

Journal of Colloid and Interface Science

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In this work, flower-like Au/BiOCO/BiO multi-heterojunction photocatalysts were prepared by a in-situ growth method. The as-prepared samples were characterized by different techniques including Transmission Electron Microscopy (TEM), X-ray diffraction (XRD), UV-vis diffuse reflectance spectrometry (DRS), X-ray photoelectron spectroscopy (XPS), Photoluminescence (PL) and photo-induced current. The photocatalytic performance of the as prepared samples was evaluated by degradation of rhodamine B (RhB) under visible light (λ>400nm). Au/BiOCO/BiO exhibited much higher activity than pure BiOCO or BiOCO/BiO. The rate constant of best one Au/BiOCO/BiO sample is 100 and 14 times as that of pure BiOCO and β-BiO/BiOCO, respectively. The enhanced photocatalytic activity of Au/BiOCO/BiO can be ascribed to the surface plasmon resonance (SPR) effects of Au nanoparticles and the formed multi-heterojunctions, which enhanced the absorbance of visible light and facilitated the transferring and separation of photogenerated electron-hole pairs, respectively.

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Microwave-assisted synthesis of Ag-doped MOFs-like organotitanium polymer with high activity in visible-light driven photocatalytic NO oxidization

Cited by 100 publications

References 32 publications

Highly Efficient and Stable Au/CeO₂–TiO₂ Photocatalyst for Nitric Oxide Abatement: Potential Application in Flue Gas Treatment

Highly Efficient and Stable Au/CeO₂–TiO₂ Photocatalyst for Nitric Oxide Abatement: Potential Application in Flue Gas Treatment

Effective Photocatalytic Activity of Mixed Ni/Fe-Base Metal-Organic Framework under a Compact Fluorescent Daylight Lamp

In-situ growth of Au and β-Bi2O3 nanoparticles on flower-like Bi2O2CO3: A multi-heterojunction photocatalyst with enhanced visible light responsive photocatalytic activity

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Microwave-assisted synthesis of Ag-doped MOFs-like organotitanium polymer with high activity in visible-light driven photocatalytic NO oxidization

Cited by 100 publications

References 32 publications

Highly Efficient and Stable Au/CeO2–TiO2 Photocatalyst for Nitric Oxide Abatement: Potential Application in Flue Gas Treatment

Highly Efficient and Stable Au/CeO2–TiO2 Photocatalyst for Nitric Oxide Abatement: Potential Application in Flue Gas Treatment

Effective Photocatalytic Activity of Mixed Ni/Fe-Base Metal-Organic Framework under a Compact Fluorescent Daylight Lamp

In-situ growth of Au and β-Bi2O3 nanoparticles on flower-like Bi2O2CO3: A multi-heterojunction photocatalyst with enhanced visible light responsive photocatalytic activity

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Highly Efficient and Stable Au/CeO₂–TiO₂ Photocatalyst for Nitric Oxide Abatement: Potential Application in Flue Gas Treatment

Highly Efficient and Stable Au/CeO₂–TiO₂ Photocatalyst for Nitric Oxide Abatement: Potential Application in Flue Gas Treatment