In situ photocalorimetry: An alternative approach to study photocatalysis by tracing heat changes and kinetics

Li, Xingxing; Huang, Zaiyin; Zuojiao, Liu; Diao, Kai-Sheng; Fan, Gao-Chao; Huang, Zhan-Peng; Tan, Xuecai

doi:10.1016/j.apcatb.2015.07.036

Cited by 22 publications

(3 citation statements)

References 46 publications

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“…It can be seen that, after 210 min of irradiation, only 59.3% of IBP has been destroyed in the presence of UV irradiation, while with UV/Fe 2+ /H 2 O 2 process it is achieved 62.1%. Therefore, the main active species responsible to the photo‐degradation are °OH, h + and

O_{2}^{-}

° which followed the sequence °OH > h + >

O_{2}^{-}

° . Thus, the maximum degradation of IBP is observed in presence of UV/Fe‐JUL‐15 (73.8%) using a catalyst concentration of 0.25 g/L.…”

Section: Resultsmentioning

confidence: 93%

Enhanced performance of Fe‐JUL‐15 prepared by ultrasonic method through the photo‐degradation of ibuprofen

Guettaia

Boudjemaa

Bachari

et al. 2017

Env Prog and Sustain Energy

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The present study involves the degradation of ibuprofen (IBP) anti‐inflammatory drug used in the pharmaceutical sector by photo‐catalysis, photolysis and photo‐Fenton processes. IBP degradation through these processes was investigated under UV irradiation used a catalyst based on iron incorporated in mesoporous silica framework (JUL‐15). The catalyst was characterized by XRD, BET, FTIR, diffuse reflectance UV‐Vis, SEM/EDX, and electrical conductivity. The photo‐catalytic properties of this material were evaluated via IBP degradation by varying different parameters as the pH levels, the concentration of IBP and the catalyst amount. The IBP abatement was monitored by UV‐visible spectrophotometry and HPLC. The characterization results indicated that, the material has a small particles size and a specific surface area above 109 m2 g−1. The optical band gap (∼ 1.4 eV) obtained from Kubelka‐Munk equation was well suited in the UV region. A higher degradation was observed with an initial catalyst concentration of 0.25 g/L. Moreover, the catalyst demonstrates significant photo‐degradation after 210 min under UV light (lamp's wavelength of 254 nm). © 2017 American Institute of Chemical Engineers Environ Prog, 37: 738–745, 2018

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O_{2}^{-}

° which followed the sequence °OH > h + >

O_{2}^{-}

° . Thus, the maximum degradation of IBP is observed in presence of UV/Fe‐JUL‐15 (73.8%) using a catalyst concentration of 0.25 g/L.…”

Section: Resultsmentioning

confidence: 93%

Enhanced performance of Fe‐JUL‐15 prepared by ultrasonic method through the photo‐degradation of ibuprofen

Guettaia

Boudjemaa

Bachari

et al. 2017

Env Prog and Sustain Energy

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“…Determination of the surface thermodynamic properties of nano-Cu 2 O will help us to understand and analyze the various surface processes for nano-Cu 2 O. In situ microcalorimetry is an effective, high-precision, and sensitive experimental technology for real-time online monitoring of changes in the thermodynamic information of a reaction system. , In our previous work, we reported the use of this technique in combination with the principles of thermodynamic cycle and the transition state theory to obtain the standard molar formation thermodynamic properties and surface thermodynamic properties of nanoparticles at different sizes and temperatures. − Furthermore, we applied this technique to the field of photocatalysis for studying the in situ thermodynamic and kinetic properties of the photocatalytic process. − Therefore, we believe that it is feasible to use a microcalorimeter to determine the surface heat capacity of nano-Cu 2 O. In this work, we use in situ microcalorimetry to obtain the thermodynamic properties during the reaction process of Cu 2 O with HNO 3 .…”

Section: Introductionmentioning

confidence: 99%

Theoretical and Experimental Studies on the Critical Size Effect on Surface Heat Capacity Using In Situ Microcalorimetry: During the Solid–Liquid Reactions of Cu₂O Nanocubes

Zhang

Tang

Gan

et al. 2022

Ind. Eng. Chem. Res.

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Phase transition, energy storage, and other activities depend critically on the size variations of nanomaterials for their heat capacity. The size variation of the nanomaterial is also equally important to the thermodynamic properties for chemical reaction processes. Based on this, it will be fascinating to examine how the surface heat capacity of nanomaterials changes with size. Herein, we used an in situ microcalorimeter to report a general approach to obtaining the regular patterns of numerical changes in the surface heat capacity at different sizes and temperatures when the chemical reactions of cuprous oxide (Cu 2 O) take place in the liquid phase. We synthesized four Cu 2 O nanocubes with uniform size distributions, which range from 40 to 120 nm, by using the liquid-phase reduction method. Combined with the principle of thermodynamic cycle and transition state theory, the effects of size and temperature changes on the standard molar formation thermodynamic properties, surface thermodynamic properties, and specific surface thermodynamic properties of Cu 2 O nanocubes were calculated and analyzed. The calculated results are in agreement with the established thermodynamic model. It is inspiring that we find that Cu 2 O nanocubes also have a critical size in the range of 55−67 nm, and their molar surface heat capacity and specific surface heat capacity are 59.35 and 59.31 nm, respectively. This property allows them to exhibit differences in thermal resistance from bulk materials within an acceptable range of error. This work has important scientific significance and values for enriching and developing the surface physical chemistry and understanding the energy storage and other processes of nanomaterials.

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“…In recent years, there have been many documented successful cases of BiVO 4 -based heterojunctions. These included: Ag 2 CO 3 /BiVO 4 ; Ag/Ag 2 O–BiVO 4 ; BiVO 4 :Ag; BiVO 4 /BiOCl; BiVO 4 /BiOBr; BiPO 4 /BiVO 4 ; Fe 2 O 3 /3DOM BiVO 4 ; BiVO 4 /InVO 4 ; BiVO 4 /Bi 2 WO 6 ; BiVO 4 /Bi 2 Ti 2 O 7 ; m-BiVO 4 /t-BiVO 4 , and so on [ 17 – 28 ]. Also, carbonaceous materials, such as activated carbon (AG), carbon dots, fullerene (C 60 ), carbon nanotubes and graphene have been widely employed for enhancement of photocatalytic activity of BiVO 4 [ 29 ].…”

Section: Introductionmentioning

confidence: 99%

Fabrication of the heterojunction catalyst BiVO ₄ /P25 and its visible-light photocatalytic activities

Cai¹,

Cheng²,

Xu³

et al. 2018

R. Soc. open sci.

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A heterojunction catalyst, BiVO4/P25, was successfully fabricated using a one-step hydrothermal method. The prepared composite was characterized using XRD, XPS, Raman, FT-IR, UV–vis, SEM, HRTEM and PL. The HRTEM pictures revealed that the heterostructured composite was composed of BiVO4 and P25, and from the pictures of SEM we could see the P25 nanoparticles assembling on the surface of flower-shaped BiVO4 nanostructures. The XPS spectra showed that the prepared catalyst consisted of Bi, V, O, Ti and C. The photocatalytic activity of BiVO4/P25 was evaluated by degraded methyl blue (MB) and tetracycline under visible light illumination (λ > 420 nm), and the results showed that BiVO4/P25 composite has a better photocatalytic performance compared with pure BiVO4 and the most active c-BiVO4/P25 sample showed enough catalytic stability after three successive reuses for MB photodegradation. The enhanced photocatalytic performance could mainly be attributed to the better optical absorption ability and good absorption ability of organic contaminants.

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In situ photocalorimetry: An alternative approach to study photocatalysis by tracing heat changes and kinetics

Cited by 22 publications

References 46 publications

Enhanced performance of Fe‐JUL‐15 prepared by ultrasonic method through the photo‐degradation of ibuprofen

Enhanced performance of Fe‐JUL‐15 prepared by ultrasonic method through the photo‐degradation of ibuprofen

Theoretical and Experimental Studies on the Critical Size Effect on Surface Heat Capacity Using In Situ Microcalorimetry: During the Solid–Liquid Reactions of Cu₂O Nanocubes

Fabrication of the heterojunction catalyst BiVO ₄ /P25 and its visible-light photocatalytic activities

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In situ photocalorimetry: An alternative approach to study photocatalysis by tracing heat changes and kinetics

Cited by 22 publications

References 46 publications

Enhanced performance of Fe‐JUL‐15 prepared by ultrasonic method through the photo‐degradation of ibuprofen

Enhanced performance of Fe‐JUL‐15 prepared by ultrasonic method through the photo‐degradation of ibuprofen

Theoretical and Experimental Studies on the Critical Size Effect on Surface Heat Capacity Using In Situ Microcalorimetry: During the Solid–Liquid Reactions of Cu2O Nanocubes

Fabrication of the heterojunction catalyst BiVO 4 /P25 and its visible-light photocatalytic activities

Contact Info

Product

Resources

About

Theoretical and Experimental Studies on the Critical Size Effect on Surface Heat Capacity Using In Situ Microcalorimetry: During the Solid–Liquid Reactions of Cu₂O Nanocubes

Fabrication of the heterojunction catalyst BiVO ₄ /P25 and its visible-light photocatalytic activities