Synthesis, characterization and adsorption ability of UiO-66-NH
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Lộc, Lưu Cẩm; Nguyen, Thi Thuy; Tri, Nguyen; Hoang, Tien Cuong

doi:10.1088/2043-6262/6/2/025004

Cited by 110 publications

(87 citation statements)

References 19 publications

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“…And finally, the third main step of weight loss was about 27% beyond 400 °C due to the decomposition of catalyst sample. As a result, the thermal stability of UiO66-NH 2 in this work was around 400 °C that was agreed with the result of other reports [15,17,21].…”

Section: Physicochemical Characteristics Of Materialssupporting

confidence: 93%

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Thin film nano-photocatalyts with low band gap energy for gas phase degradation of p -xylene: TiO ₂ doped Cr, UiO66-NH ₂ and LaBO ₃ (B = Fe, Mn, and Co)

Lộc

Nguyen

Tri

et al. 2017

Adv. Nat. Sci: Nanosci. Nanotechnol.

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By dip-coating technique the thin films of nano-photocatalysts TiO2, Cr-doped TiO2, LaBO3 perovskites (B = Fe, Mn, and Co) prepared by sol-gel method, and UiO66-NH2 prepared by a solvothermal were obtained and employed for gas phase degradation of p-xylene. Physicochemical characteristics of the catalysts were examined by the methods of BET, SEM, TEM, XRD, FT-IR, TGA, Raman and UV–vis spectroscopies. The thickness of film was determined by a Veeco-American Dektek 6M instrument. The activity of catalysts was evaluated in deep photooxidation of p-xylene in a microflow reactor at room temperature with the radiation sources of a UV (λ = 365 nm) and LED lamps (λ = 400–510 nm). The obtained results showed that TiO2 and TiO2 doped Cr thin films was featured by an anatase phase with nanoparticles of 10–100 nm. Doping TiO2 with 0.1%mol Cr2O3 led to reduce band gap energy from 3.01 down to 1.99 eV and extend the spectrum of photon absorption to the visible region (λ = 622 nm). LaBO3 perovkite thin films were also featured by a crystal phase with average particle nanosize of 8–40 nm, a BET surface area of 17.6–32.7 m2 g−1 and band gap energy of 1.87–2.20 eV. UiO66-NH2 was obtained in the ball shape of 100–200 nm, a BET surface area of 576 m2 g−1 and a band gap energy of 2.83 eV. The low band gap energy nano-photocatalysts based on Cr-doped TiO2 and LaBO3 perovskites exhibited highly stable and active for photo-degradation of p-xylene in the gas phase under radiation of UV–vis light. Perovskite LaFeO3 and Cr–TiO2 thin films were the best photocatalysts with a decomposition yield being reached up to 1.70 gp-xylene/gcat.

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Section: Physicochemical Characteristics Of Materialssupporting

confidence: 93%

“…Amoni-functionalized UiO66 (UiO66-NH 2 ) was synthesized by a solve-thermal method, described in detail in our previous article [15], with a difference CH 3 OH was used as an exchanged solvent instead of CH 2 Cl 2 .…”

Section: Catalyst Synthesismentioning

confidence: 99%

Thin film nano-photocatalyts with low band gap energy for gas phase degradation of p -xylene: TiO ₂ doped Cr, UiO66-NH ₂ and LaBO ₃ (B = Fe, Mn, and Co)

Lộc

Nguyen

Tri

et al. 2017

Adv. Nat. Sci: Nanosci. Nanotechnol.

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“…The BET surface area and the total pore volume of UiO-66-NH 2 are 1384.6 m 2 g −1 and 0.654 cm 3 g −1 , respectively, much higher than UiO-66-NH 2 /TiO 2 , which are 671.7 m 2 g −1 and 0.0672 cm 3 g −1 , respectively. 30,31 The presence of TiO 2 in the UiO-66-NH 2 /TiO 2 nanocomposites is confirmed by the presence of the stretching vibration absorption peak arising from O-Ti-O at 562.6 cm −1 , while the other peaks of UiO-66-NH 2 remain unchanged. Fig.…”

Section: Resultsmentioning

confidence: 91%

Highly stable and ultrasensitive chlorogenic acid sensor based on metal–organic frameworks/titanium dioxide nanocomposites

Wang

Chen

et al. 2016

Analyst

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Metal-organic frameworks/titanium dioxide (UiO-66-NH2/TiO2) nanocomposites have been prepared by a simple hydrothermal reaction and they exhibit excellent electrocatalytic activity for chlorogenic acid oxidation due to the synergic effect of UiO-66-NH2 and TiO2. Under the optimal conditions, the sensor can be employed in the quantification of chlorogenic acid in the ranges of 0.01-1.0 μmol L(-1) and 1.0-15 μmol L(-1) with an ultralow detection limit of 7 nmol L(-1) (S/N = 3). Moreover, UiO-66-NH2/TiO2 nanocomposites demonstrate significant stability in acidic buffer solution and maintain their electrocatalytic activities at least up to 90 cycles. The potential utility was validated by the analysis of coffee and tea samples and good recoveries were obtained from different spiked values. The UiO-66-NH2/TiO2 based sensor with highly sensitive, selective and stable consecutive monitoring of chlorogenic acid is a promising candidate for the construction of highly active electrocatalyst in electrochemical biosensors.

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“…On the P25, there is no inhibition of CO 2 because the rate of its production in the p ‐xylene photooxidation is low ( k is small), while on LaFeO 3 the suppression by CO 2 is strongest due to the highest value of reaction rate constant ( k ). The previous investigation showed that although adsorption capacity of UiO‐66 is not high compared to other MOFs, by adding functional groups in structures led to its increase in adsorption capacity. The experiments indicated that in comparison with UiO‐66 the addition of NH 2 could increase the CO 2 storage capacity at 1 bar and 303 K twice from 28.43 up to 52 cm 3 ⋅g −1 …”

Section: Resultsmentioning

confidence: 96%

“…The previous investigation showed that although adsorption capacity of UiO‐66 is not high compared to other MOFs, by adding functional groups in structures led to its increase in adsorption capacity. The experiments indicated that in comparison with UiO‐66 the addition of NH 2 could increase the CO 2 storage capacity at 1 bar and 303 K twice from 28.43 up to 52 cm 3 ⋅g −1 …”

Section: Resultsmentioning

confidence: 96%

Kinetics of photocatalytic degradation of gaseous p‐xylene on UiO‐66‐NH₂ and LaFeO₃ thin films under combined illumination of ultraviolet and visible lights

Thuy¹,

Lộc

Tri³

et al. 2019

Int J of Chemical Kinetics

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The thin film photocatalysts were prepared from solvothermal UiO‐66‐NH2 and sol‐gel perovskite LaFeO3 by a dip‐coating technique. The properties of obtained catalysts were investigated by the methods of Brunauer‐Emmett‐Teller adsorption, XRD, SEM, FT‐IR, TGA, and UV‐vis spectroscopies. The results proved that the thin film of the thickness of 4.2 and 4.7 µm was successfully prepared from micro‐mesoporous UiO‐66‐NH2 and LaFeO3 nanocrystals. Possessing small crystals (9‐35 nm) and the band gap energy of 2.83 and 1.92 eV, respectively, UiO‐66‐NH2 and LaFeO3 are shown to be a highly active visible‐light photocatalyst for photodegradation of p‐xylene‐contained gas. The kinetics of photocatalytic degradation of p‐xylene under combined illumination of ultraviolet and visible lights over obtained UiO‐66‐NH2 and LaFeO3 thin films were carried out in a gradientless flow circulating system at room temperature and atmospheric pressure. The results showed that the Langmuir‐Hinshelwood kinetic model was successfully applied to correlate the obtained data. The kinetics of the reaction on both catalysts were found to be written by the fractional equation, describing the dependence of the reaction rate on the concentration of p‐xylene, oxygen molecules, dissociative adsorbed water vapor, the photon flux, and the inhibition of CO2 product. It implies that the reaction occurred at high surface coverages, molecular p‐xylene, and oxygen participated in the reaction in the form of surface molecular; water—in the forms of •OH and H+. Although there is a general kinetic equation for reaction on various catalysts, the different affinities of the catalysts with the compounds present in the reaction create the kinetic feature of the reaction on each catalyst. Because of the high affinity of catalysts with water vapor, the given reactant increased the rate of p‐xylene photocatalytic degradation at low concentration but inhibited it in the high concentration region. The adsorption affinity of LaFeO3 to oxygen is higher compared to UiO‐66‐NH2; then, there was an optimum concentration of oxygen in the photodegradation of p‐xylene on the former, whereas in the latter monotonically increasing relationship was found.

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Synthesis, characterization and adsorption ability of UiO-66-NH ₂

Cited by 110 publications

References 19 publications

Thin film nano-photocatalyts with low band gap energy for gas phase degradation of p -xylene: TiO ₂ doped Cr, UiO66-NH ₂ and LaBO ₃ (B = Fe, Mn, and Co)

Thin film nano-photocatalyts with low band gap energy for gas phase degradation of p -xylene: TiO ₂ doped Cr, UiO66-NH ₂ and LaBO ₃ (B = Fe, Mn, and Co)

Highly stable and ultrasensitive chlorogenic acid sensor based on metal–organic frameworks/titanium dioxide nanocomposites

Kinetics of photocatalytic degradation of gaseous p‐xylene on UiO‐66‐NH₂ and LaFeO₃ thin films under combined illumination of ultraviolet and visible lights

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Synthesis, characterization and adsorption ability of UiO-66-NH 2

Cited by 110 publications

References 19 publications

Thin film nano-photocatalyts with low band gap energy for gas phase degradation of p -xylene: TiO 2 doped Cr, UiO66-NH 2 and LaBO 3 (B = Fe, Mn, and Co)

Thin film nano-photocatalyts with low band gap energy for gas phase degradation of p -xylene: TiO 2 doped Cr, UiO66-NH 2 and LaBO 3 (B = Fe, Mn, and Co)

Highly stable and ultrasensitive chlorogenic acid sensor based on metal–organic frameworks/titanium dioxide nanocomposites

Kinetics of photocatalytic degradation of gaseous p‐xylene on UiO‐66‐NH2 and LaFeO3 thin films under combined illumination of ultraviolet and visible lights

Contact Info

Product

Resources

About

Synthesis, characterization and adsorption ability of UiO-66-NH ₂

Thin film nano-photocatalyts with low band gap energy for gas phase degradation of p -xylene: TiO ₂ doped Cr, UiO66-NH ₂ and LaBO ₃ (B = Fe, Mn, and Co)

Thin film nano-photocatalyts with low band gap energy for gas phase degradation of p -xylene: TiO ₂ doped Cr, UiO66-NH ₂ and LaBO ₃ (B = Fe, Mn, and Co)

Kinetics of photocatalytic degradation of gaseous p‐xylene on UiO‐66‐NH₂ and LaFeO₃ thin films under combined illumination of ultraviolet and visible lights