The effect of calcination atmosphere on the structure and photoactivity of TiO2 synthesized through an unconventional doping using activated carbon

Slimen, Houda; Lachheb, Hinda; Qourzal, Samir; Assabbane, Ali; Houas, Ammar

doi:10.1016/j.jece.2015.02.017

Cited by 10 publications

(2 citation statements)

References 44 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This is because the incorporation of biochar with ZnO causes ZnO to be dispersed on the surface of the biochar causing a larger surface area of the photocatalyst. The larger the surface area of the photocatalyst, the higher the photocatalytic activity [40]. The high photocatalytic activity of ZnO/ECB can also be seen from the energy gap value of the ZnO/ECB photocatalyst.…”

Section: Resultsmentioning

confidence: 99%

Synthesis of ZnO/ECB (Eichhornia crassipes Biochar) as a Sustainable Efficient Photocatalyst for Photodegradation of Reactive Black-5

Mulyatun¹,

Udaibah²,

Hafidzotur³

et al. 2021

Proceedings of the International Conference on Science and Engineering (ICSE-UIN-SUKA 2021)

View full text Add to dashboard Cite

ZnO/ECB photocatalyst (Eichhornia crassipes Biochar) has been synthesized to be applied as a photocatalyst in the degradation of Reactive Black-5 dye. ZnO/ECB photocatalyst was synthesized by the coprecipitation method with the ratio Zn(NO3)2.6H2O:ECB (M:w) 0.25:1 (0.25MZnO/ECB); 0.45:1 (0.45MZnO/ECB); and 0.6;1 (0.6MZnO/ECB). The characteristics of the ZnO/ECB photocatalyst were tested using X-ray diffraction, Fourier Transforms Infrared (FTIR), and UV Diffuse Reflectance Spectroscopy (UV-DRS) to determine the energy gap of the photocatalyst. The diffractogram pattern showed that the ZnO/ECB crystals were hexagonal wurtzite in shape. The results of the Kubelka-Munk UV-DRS analysis showed that the energy gap of the ZnO/ECB photocatalyst was smaller than that of pure ZnO. The efficiency of the ZnO/ECB catalyst was evaluated through photocatalytic degradation of an aqueous solution of Reactive Black-5 dye. Measurement of photocatalytic activity under UV radiation showed that ZnO/ECB photocatalyst has a higher degradation ability than pure ZnO. The high photocatalytic activity of the ZnO/ECB catalyst was due to the low energy gap of the ZnO/ECB catalyst, thereby reducing the electron and hole recombination rate in the synthesized photocatalyst. Photocatalyst of 0.25ZnO/ECB has the highest photocatalytic activity with degradation efficiency reaching 75.47%.

show abstract

Section: Resultsmentioning

confidence: 99%

Synthesis of ZnO/ECB (Eichhornia crassipes Biochar) as a Sustainable Efficient Photocatalyst for Photodegradation of Reactive Black-5

Mulyatun¹,

Udaibah²,

Hafidzotur³

et al. 2021

Proceedings of the International Conference on Science and Engineering (ICSE-UIN-SUKA 2021)

View full text Add to dashboard Cite

show abstract

“…Presently, the development of novel catalysts, which is crucial to the advancement of SCR, is largely focused on the optimization of active components, calcination temperature and calcination time [14][15][16], thus emphasizing the significance of the calcination process. Nevertheless, research regarding the effects of the calcination atmosphere has been relatively scarce, even though many reports [27][28][29][30][31][32] suggest that the calcination atmosphere could make a significant difference in terms of the particle sizes, defect concentrations, valence states and phase structures of catalysts, giving rise to variations in catalytic properties. In addition, previous studies conducted by our own group have determined that the calcination atmosphere greatly affects the catalytic activity of MnOx/TiO2 catalysts for low-temperature SCR [33,34].…”

Section: Introductionmentioning

confidence: 99%

Performance enhancement mechanism of Mn-based catalysts prepared under N 2 for NO x removal: Evidence of the poor crystallization and oxidation of MnO x

Xie

Fang

et al. 2017

Chinese Journal of Catalysis

View full text Add to dashboard Cite

Among multitudinous metal-oxide catalysts for the selective catalytic reduction of NOx with NH3 (NH3-SCR), Mn-based catalysts have become very popular and developed rapidly in recent years because of its superior low-temperature denitrification activity, mainly originating from multi-valence of Mn. Most studies suggest that the catalytic activity of multi-component oxides is superior to that of single-component catalysts owing to the synergistic effect among the metallic elements in such materials, of which more attentions have been given to Ce as an additive owing to its powerful oxygen storage capacity, redox ability and its ready availability. As the core of SCR technology, the research points in catalyst development at the present stage of all researchers in countries mainly centralize on the optimization of active components, carriers, calcination temperature, calcination time and temperature-raising procedure, giving little thought to the effects of the calcination atmosphere. In the present work, Ce-modified Mn-based catalysts were prepared by a simple impregnation method. The effects of the calcination atmosphere (N2, air or O2) on the performance of the resulting materials during NH3-SCR and its causes of the differences were subsequently investigated and characterized using various analytical methods. Data obtained from X-ray diffraction, thermogravimetry and temperature-programmed reduction with hydrogen show that calcination under N2 reduces both the degree of oxidation and crystallization of the MnOx. Scanning electron microscopy also demonstrates that the use of N2 inhibits the growth of grains and increases the dispersion of the catalysts. In addition, the results of temperature-programmed desorption with ammonia indicate that catalysts calcined under N2 exhibit a greater quantity of acid sites. Finally, X-ray photoelectron spectrometry and activity results demonstrate that MnOx in the lower valence states is more favorable for NH3-SCR reactions. In conclusion, catalysts calcined under N2 show superior performance during NH3-SCR for NOx removal, allowing NO conversions up to 94% at 473 K.

show abstract

Non-metal modified TiO2: a step towards visible light photocatalysis

Mittal

Marı́

Sharma

et al. 2019

J Mater Sci: Mater Electron

View full text Add to dashboard Cite

The effect of calcination atmosphere on the structure and photoactivity of TiO2 synthesized through an unconventional doping using activated carbon

Cited by 10 publications

References 44 publications

Synthesis of ZnO/ECB (Eichhornia crassipes Biochar) as a Sustainable Efficient Photocatalyst for Photodegradation of Reactive Black-5

Synthesis of ZnO/ECB (Eichhornia crassipes Biochar) as a Sustainable Efficient Photocatalyst for Photodegradation of Reactive Black-5

Performance enhancement mechanism of Mn-based catalysts prepared under N 2 for NO x removal: Evidence of the poor crystallization and oxidation of MnO x

Non-metal modified TiO2: a step towards visible light photocatalysis

Contact Info

Product

Resources

About