Photocatalytic decomposition of 4-nitrophenol on Ti-containing MCM-41

Do, Youngkyu; Kim, Jin-Ho; Park, Jin-Hwan; Park, Seongsoo; Hong, Seong-Soo; Suh, Cha-Soo; Lee, Gun-Dae

doi:10.1016/j.cattod.2005.03.009

Cited by 56 publications

(33 citation statements)

References 21 publications

(26 reference statements)

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Introduction of Ti into siliceous mesoporous materials has been recognized as an effective method to prepare titanium oxide species with higher surface area, and has given a new approach for the application of mesoporous materials in oxidation catalysis [5]. Recently, it has been reported that incorporation of photoactive species such as Cr-Ti substituted titanium oxides into framework of MCM-41 [6] yields a photocatalyst with discernible activities in both UV and visible light regions. Unfortunately however, poor wetting stability of MCM-41 under conditions of prolonged use of the catalyst in aqueous environment has generally restricted its utilization.…”

Section: Introductionmentioning

confidence: 99%

Post-synthesis of TiO2 Dispersed Inside the Pore Channels of SBA-15 and its Photocatalytic Activity for the Degradation of Methylene Blue

Shindo

Koizumi

Hatakeyama

et al. 2011

Int.J.Soc.Mater.Eng.Resour.

View full text Add to dashboard Cite

TiO 2 -SBA-15 mesoporous materials in which titanium oxide species were dispersed inside the pore channels of SBA-15 were prepared by a novel post-synthesis method. In this method, cetyltrimethylammonium bromide surfactant molecules were incorporated inside the channels of the mesopores of SBA-15 followed by the addition of titanium tetraethoxide. Effect of hydrolysis conditions of titanium tetraethoxide on the formation and properties of Ti oxides in TiO 2 -SBA-15 materials was investigated. Physico-chemical properties of TiO 2 -SBA-15 materials were characterized by XRD, N 2 adsorption, SEM and UV-vis. Size and morphology of Ti oxide species in TiO 2 -SBA-15 materials were dependent on the hydrolysis conditions of titanium tetraethoxide, i.e., H 2 O/Ti molar ratio. Dispersed titanium oxide species were mainly formed on the internal surface of SBA-15, i.e., on the surface of mesopore walls of the TiO 2 -SBA-15 samples when synthesized at low H 2 O/Ti ratios of 2 and 4, whereas large TiO 2 anatase particles were predominantly formed on the external surface of SBA-15 when the samples were prepared at high H 2 O/Ti molar ratios. The photocatalytic activity of the TiO 2 -SBA-15 samples was investigated for the degradation of methylene blue, MB, and compared with that of pure TiO 2 , P25. The TiO 2 -SBA-15 samples, in which titanium oxide species were dispersed on the internal surface of SBA-15, showed higher and more stable photocatalytic activity in the degradation and/or decolorization of MB than P25 and TiO 2 -SBA-15 which has TiO 2 particles on the outer surface of SBA-15.

show abstract

Section: Introductionmentioning

confidence: 99%

Post-synthesis of TiO2 Dispersed Inside the Pore Channels of SBA-15 and its Photocatalytic Activity for the Degradation of Methylene Blue

Shindo

Koizumi

Hatakeyama

et al. 2011

Int.J.Soc.Mater.Eng.Resour.

View full text Add to dashboard Cite

show abstract

“…to Ti 3? [6,11]. Although it is known that TiO 2 is reduced at very high temperatures (around 1300°C) [52], Fe2O 3 may promote the reduction of Ti 4?…”

Section: Samplementioning

confidence: 96%

“…Figure 1 gives out the corresponding low-angle XRD patterns. The MCM-41 sample shows a well defined hexagonal structure, which is evidenced by the diffraction peaks at 2.4°, 4.3°and 5.0°assignable to the (100), (110) and (200) silica planes, respectively [11]. However, a decrease in the structural regularity is observed upon the loading of Cr, Fe or Co. Then, an additional loading of TiO 2 has not greatly modified the structural ordering of the samples, except for the TiO 2 /Co/MCM-41 sample.…”

Section: Catalytic Experimentsmentioning

confidence: 97%

Synthesis and Photocatalytic Activity of Titania-Loaded Transition Metal-Modified MCM-41 Molecular Sieves

et al. 2011

View full text Add to dashboard Cite

MCM-41 materials were modified with Cr, Fe, Co and Ti by the wet impregnation method. Various techniques including ICP, XRD, N 2 adsorption, UV-Vis DRS and TPR were employed for the catalysts characterization. The Acid Orange 7 (AO7) degradation in aqueous solution was studied over the synthesized photocatalyst under UV-Vis and visible radiation. The Cr modified catalysts exhibited the major activity under UV and visible light. Particularly, the Cr/MCM-41 sample reached a dye degradation of around 81% in visible light, being the Cr 6? species primarily responsible for this photoactivity. Upon the loading of TiO 2 , the searched heterojunction effect between chromium and titania species was not observed.

show abstract

“…Specially, the pore size of ordered mesoporous material can be tuned within the nanosize range and the pore surface can be functionalized with various organic materials [5,6]. When compared to MCM-41, SBA-15 provides a more stable matrix for forming occluded nanoparticles, due to its thicker walls and large pore size [7].…”

Section: Introductionmentioning

confidence: 99%

Effect of Pretreatment Conditions on the Catalytic Activity of Benzene Combustion Over SBA-15-Supported Copper Oxides

et al. 2010

Self Cite

View full text Add to dashboard Cite

show abstract

Photocatalytic decomposition of 4-nitrophenol on Ti-containing MCM-41

Cited by 56 publications

References 21 publications

Post-synthesis of TiO2 Dispersed Inside the Pore Channels of SBA-15 and its Photocatalytic Activity for the Degradation of Methylene Blue

Post-synthesis of TiO2 Dispersed Inside the Pore Channels of SBA-15 and its Photocatalytic Activity for the Degradation of Methylene Blue

Synthesis and Photocatalytic Activity of Titania-Loaded Transition Metal-Modified MCM-41 Molecular Sieves

Effect of Pretreatment Conditions on the Catalytic Activity of Benzene Combustion Over SBA-15-Supported Copper Oxides

Contact Info

Product

Resources

About