Photocatalytic removal of SO2 over Mn doped titanium dioxide supported by multi-walled carbon nanotubes

Bao, Jianchun; Dai, Ying; Líu, Hao; Yang, Linjun

doi:10.1016/j.ijhydene.2016.03.174

Cited by 18 publications

(12 citation statements)

References 32 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…TEM analysis of TiO 2 samples formed on the CNT by hydrothermal method (Figure f–k) illustrates the formation of TiO 2 nanoparticle clusters with an intimate bound along the side walls as well as the ends of CNT. Similar results have been previously obtained on TiO 2 @CNT composites. − As seen in Figure f–h, the TiO 2 nanoparticles distributed between the bundles and the CNT are able to hinder the agglomeration of TiO 2 particles. FT-IR analysis of CNT also confirmed the formation of functional groups on the surface of CNT as a result of the functionalization process.…”

Section: Resultssupporting

confidence: 88%

Effects of Carbon Nanotube and Carbon Sphere Templates in TiO₂ Composites for Photocatalytic Hydrogen Production

Estahbanati

Feilizadeh

Yancheshmeh

et al. 2019

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

Incorporation of carbonaceous templates (CT) into TiO2 composites is a promising alternative to increase the photocatalytic activity of TiO2. In this work, the effects of carbon sphere (CS) and carbon nanotube (CNT) incorporation (as CT) in TiO2 composites were thoroughly investigated and the roles of these CTs as template, cocatalyst, and adsorbent were studied. To this end, three different methods were utilized to form a layer of TiO2 on the CT: alcoholic phase sol–gel, aqueous phase sol–gel, and hydrothermal. The role of CT as template was examined through morphology analysis of the prepared composites. The cocatalyst and adsorbent roles of CT were investigated based on photocatalytic hydrogen production from glycerol. Interestingly, it was found that the incorporation of CNT into TiO2 composite can approximately double the rate of hydrogen production (i) in the absence of Pt or (ii) at low glycerol concentration. Accordingly, it was concluded that in addition to being a template, the CNT can play two important roles as cocatalyst and adsorbent.

show abstract

Section: Resultssupporting

confidence: 88%

Effects of Carbon Nanotube and Carbon Sphere Templates in TiO₂ Composites for Photocatalytic Hydrogen Production

Estahbanati

Feilizadeh

Yancheshmeh

et al. 2019

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

show abstract

“…Flue gas humidity is regarded as a significant component relating to the formation of hydroxyl groups on the surface of a photocatalyst. Meanwhile, H 2 O has attracted much more attention for its multiple roles in photocatalytic oxidation compared with the roles of O 2 . To probe the influence of flue gas humidity on SO 2 photocatalytic removal, Figure compares SO 2 removal efficiencies under different gas mixtures.…”

Section: Resultsmentioning

confidence: 99%

Photochemical Removal of SO₂ over TiO₂-Based Nanofibers by a Dry Photocatalytic Oxidation Process

2017

View full text Add to dashboard Cite

Efficient and economical technologies are essential to the control of SO 2 , the emission of which poses serious health concerns and environmental risks. Photocatalysis is an attractive method for reducing SO 2 emissions. To reduce energy consumption for excess moisture evaporation, a dry photocatalytic oxidation (DPCO) system was used instead of a traditional gas−liquid process in this study. Considering that TiO 2 is a widely applied photocatalyst for the purification of gaseous pollutants, this study investigated the photocatalytic removal of SO 2 over different TiO 2 -based nanofibers. Results show that the reduction of SO 2 was mainly due to oxidation. Under ultraviolet irradiation, the removal of SO 2 was enhanced by the presence of NO 2 , which was formed by the oxidation of NO. More interestingly, the SO 2 removal efficiency remains 100% over cerium-based titania nanofibers with an increase in gas humidity, indicating that this sample has excellent resistance to H 2 O. This is very beneficial for application in an actual flue gas atmosphere, where H 2 O is inevitable. In contrast, H 2 O played a bifacial effect in the photocatalytic removal of SO 2 over copper-based titania nanofibers. Under low levels of H 2 O (<4%), competitive adsorption for active sites leads to the deactivation of photocatalytic activity, while addition of 8% H 2 O resulted in more SO 2 dissolution. Nevertheless, the promoting effect was limited; competitive adsorption was the major factor. Accordingly, the main reaction products are H 2 SO 4 and H 2 SO 3 . These indicate that combining photocatalysis technology with TiO 2 -based nanofibers is a promising strategy for oxidizing SO 2 during a DPCO process.

show abstract

“…Liu et al [26] investigated the adsorption of SO 2 and NO on Cu-doped Multi-Walled Carbon Nanotubes/TiO 2 (MWCNTs/TiO 2 ), with the removal efficiency of 62% and 43%, respectively. Bao et al [27] prepared MWCNTs/TiO 2 doped with Mn to remove SO 2 , which showed a good desulfurization efficiency (66%). Yang et al [28] synthesized Cr-doped MWCNTs/TiO 2 for SO 2 removal; the results showed that Cr-doped MWCNTs/TiO 2 displayed a better adsorption property than MWCNTs/TiO 2 .…”

Section: Introductionmentioning

confidence: 99%

Study on Photocatalytic Desulfurization and Denitrification Performance of Cu- and Cr-Modified MWCNT

Jian

Tong

et al. 2021

Processes

View full text Add to dashboard Cite

Carbon nanotubes are a promising adsorbent for desulfurization and denitrification. In this paper, Cu- and Cr-doped TiO2 supported by multi-walled carbon nanotubes (MWCNTs/Cu-Cr-TiO2) were synthesized by the sol-gel method. Characterizations of the samples were performed by TEM, XPS, XRD, DRS, and BET. The experiments of simultaneous desulfurization and denitrification were conducted in a fixed-bed reactor. The results showed that the adsorbent with a Cu to Cr molar ratio of 3 displays excellent adsorption property. The SO2 and NO adsorption capacity of MWCNTs/Cu-Cr-TiO2 (Cu/Cr = 3) were 36.83 and 12.34 mg/g under the optimal experimental operating parameters (SO2 content: 1575 mg/m3, NO content 736 mg/m3, O2 content 8%, H2O content 5%, and space velocity 1003 h−1). The adsorption capacity of MWCNTs/Cu-Cr-TiO2 was significantly better than that of the adsorbent doped with Cu or Cr alone (MWCNTs/Cu-TiO2 and MWCNTs/Cr-TiO2). Compared with single metal doping, bimetallic multivalent states accelerate the electron migration and separation from holes, which increase the number of oxygen vacancies and enhance the adsorption of SO2 and NO. The kinetic models and the reaction mechanism of the desulfurization and denitrification were also analyzed in this work.

show abstract

Photocatalytic removal of SO2 over Mn doped titanium dioxide supported by multi-walled carbon nanotubes

Cited by 18 publications

References 32 publications

Effects of Carbon Nanotube and Carbon Sphere Templates in TiO₂ Composites for Photocatalytic Hydrogen Production

Effects of Carbon Nanotube and Carbon Sphere Templates in TiO₂ Composites for Photocatalytic Hydrogen Production

Photochemical Removal of SO₂ over TiO₂-Based Nanofibers by a Dry Photocatalytic Oxidation Process

Study on Photocatalytic Desulfurization and Denitrification Performance of Cu- and Cr-Modified MWCNT

Contact Info

Product

Resources

About

Photocatalytic removal of SO2 over Mn doped titanium dioxide supported by multi-walled carbon nanotubes

Cited by 18 publications

References 32 publications

Effects of Carbon Nanotube and Carbon Sphere Templates in TiO2 Composites for Photocatalytic Hydrogen Production

Effects of Carbon Nanotube and Carbon Sphere Templates in TiO2 Composites for Photocatalytic Hydrogen Production

Photochemical Removal of SO2 over TiO2-Based Nanofibers by a Dry Photocatalytic Oxidation Process

Study on Photocatalytic Desulfurization and Denitrification Performance of Cu- and Cr-Modified MWCNT

Contact Info

Product

Resources

About

Effects of Carbon Nanotube and Carbon Sphere Templates in TiO₂ Composites for Photocatalytic Hydrogen Production

Effects of Carbon Nanotube and Carbon Sphere Templates in TiO₂ Composites for Photocatalytic Hydrogen Production

Photochemical Removal of SO₂ over TiO₂-Based Nanofibers by a Dry Photocatalytic Oxidation Process