Photocatalytic degradation of dye pollutant over Ti and Co doped SBA-15: Comparison of activities under visible light

Suraja, P. V.; Yaakob, Zahira; Binitha, N. N.; Resmi, M. R.; Silija, P. P.

doi:10.1016/j.cej.2011.05.071

Cited by 32 publications

(20 citation statements)

References 33 publications

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“…For Ti-SBA-15 samples, the IR absorption at about 960 cm −1 usually is characteristic of the Ti-O-Si vibration. However, there are still some deputes over the assignment of the band at 960 cm −1 in titanium-containing molecular sieves, which is often assigned to asymmetric Si-O-Ti vibration and correlated with the presence of Si-OH group [20]. In the present work, the band at about 960 cm −1 is slightly weak in pure siliceous SBA-15.…”

Section: Resultsmentioning

confidence: 41%

Synthesis of Titanium Containing SBA-15 and Its Application for Photocatalytic Degradation of Phenol

Yang

Jiang

Lai

et al. 2014

International Journal of Chemical Engineering

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We synthesized Ti-containing SBA-15 by one-pot hydrothermal method and extensively investigated its physicochemical properties and examined its photocatalytic activity to degrade phenol. It’s shown that appropriate amount of titanium could be effectively incorporated into the framework of SBA-15 without provoking structure change and the tetrahedrally coordinated titanium species were well-ordered in Ti-incorporated SBA-15. Under UV-irradiation, the Ti-containing SBA-15 exhibits good photocatalytic activity for phenol degradation in the simulated waste water. The higher photocatalytic activity of Ti-containing SBA-15 to degrade phenol was ascribed to the more titanium content and anatase titanium dioxide. In addition, the new photocatalyst displays a good regeneration and cyclic performance after six runs.

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Section: Resultsmentioning

confidence: 41%

Synthesis of Titanium Containing SBA-15 and Its Application for Photocatalytic Degradation of Phenol

Yang

Jiang

Lai

et al. 2014

International Journal of Chemical Engineering

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“…The higher conversion and reaction rates were obtained in the first period of reaction when H 2 O 2 was introduced after adsorption the step (samples VTi-2 and NbTi-2). These results sustained the effect of the adsorption step on oxidation reaction confirmed, over time, by photocatalytic reactions, other oxidation processes in which both Ti and V catalysts or other transition metals with redox properties were used immobilized on mesoporous silica [7][8][9][10]28]. An induction period was needed (VTi-1, NbTi-1catalyst) in oxidation of aromatic hydrocarbons when the oxidant, reagent, catalyst, and solvent were mixed together at the beginning of the reaction and effect of the second metal was significant.…”

Section: Vmcm-41supporting

confidence: 63%

“…The presence of redox couple Ce 4+/ Ce 3+ exchaged the surface oxygen vacancies that could be transformed in oxygen radicals with formation of superoxide radicals. Many other photocatalysts were obtained by immobilization of the photoactive transition metals on various mesoporous silica supports, and their activity was evaluated in oxidation of organic polutants from water as dyes, functionalized 8-hydroxyquinolinate, antibiotics [9,10,28,56]. In all of these, the active photoactive metallic sites were Ti 4+ , Co 2+ , Fe 3+ , Al 3+ , Zn 2+ , Eu 3+ , Tb 3+ , Er 3+ , Nd 3+ with various dispersion on MCM-41, SBA-15 or hierarchical silica supports.…”

Section: Incorporated Metal Active Sites With Redox Propertiesmentioning

confidence: 99%

“…The ordered mesoporous silicas (OMSs) containing transition metals are versatile catalytic materials for oxidation of a wide range of organic compounds [1][2][3]. Mesoporous materials with various structures such as MCM-41 (2d hexagonal p6mm) [4][5][6], MCM-48 (3d cubic Ia3d) [7,8], SBA-15 (large-pore 2d hexagonal p6mm) [2,[9][10][11][12], SBA-16 (large-pore 3d cubic Im3m) [13], KIT-5 (well-ordered cage-type mesoporous with cubic Fm3m) [2], and KIT-6 (large-pore cubic with interpenetrated cylindrical mesopores Ia3d) [2,[14][15][16][17][18] have been used as supports for transition metals. These supports with controlled morphology and accessible metallic center for the reactant molecules also offered the opportunity to immobilize the transition metal complexes and their heterogenization [19,20].…”

Section: Introductionmentioning

confidence: 99%

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Catalytic Behavior of Metal Active Sites From Modified Mesoporous Silicas in Oxidation of Organic Compounds

Pârvulescu¹

2020

Redox

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The ordered mesoporous silicas containing transition metals are versatile catalytic materials for oxidation of a wide range of organic compounds. In order to obtain active catalysts, different active redox metal sites have been introduced into specific locations (mesoporous channels and framework) of ordered mesoporous silicas (OMSs). All the reported results evidenced that localization of metal ions, their interaction with another metal (bimetallic catalysts) and the support, with typical properties of the ordered mesoporous silica, influenced the oxidation state, respectively their redox properties. To support this, the results regarding the specific properties of transitional metals in the ordered structure of silica, obtained using various characterization methods, were presented. The activity of metal sites in the oxidation reactions was evidenced in various applications carried out in the liquid or gaseous phase. The oxidation of various organic compounds in liquid phase with H 2 O 2 (especially aromatic compounds and of alcohols) and in gas phase with oxygen from air was presented for a variety of metal-modified OMSs. The active sites and possible reaction mechanisms were presented for some catalytic systems. The immobilization of multiple metal active species on new ordered porous frameworks and their synergistic interactions remain topics of interest in the future.

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“…22 The band at 962 cm À1 is characteristic of the Ti-O-Si vibration. 23 As to the FT-IR spectra of N/Ti-SBA-15, the peaks at 1628 cm À1 and 3430 cm À1 are slightly weaken ascribing to the hybrid stretching vibration and bending vibration of N-H in amine and O-H, respectively. In addition, the peak at 1474 cm À1 belonged to bending vibration of the Ti-N bond.…”

Section: Resultsmentioning

confidence: 97%

Enhancing photocatalytic degradation of phenol through nitrogen- and nitrogen/fluorine-codoped Ti-SBA-15

et al. 2015

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F-N/Ti-SBA-15 and N/Ti-SBA-15 were prepared by hydrothermal method using ammonium fluoride and triethylamine as nonmetal dopants, respectively. The structure and surface properties of the as-prepared samples have been characterized by N 2 adsorption-desorption isotherms, UV-Vis DRS spectra, FT-IR and XPS. It was found that the doping of non-metals could narrow the band gap of samples without changes in the mesoporous structure properties. The F-N/Ti-SBA-15 was demonstrated as efficient catalyst for photodegradation of phenol both in the UV light and visible light. The formation of surface oxygen vacancies may be responsible for the promotion of nonmetal F-N/Ti-SBA-15 on the photodegradation of phenol.

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Photocatalytic degradation of dye pollutant over Ti and Co doped SBA-15: Comparison of activities under visible light

Cited by 32 publications

References 33 publications

Synthesis of Titanium Containing SBA-15 and Its Application for Photocatalytic Degradation of Phenol

Synthesis of Titanium Containing SBA-15 and Its Application for Photocatalytic Degradation of Phenol

Catalytic Behavior of Metal Active Sites From Modified Mesoporous Silicas in Oxidation of Organic Compounds

Enhancing photocatalytic degradation of phenol through nitrogen- and nitrogen/fluorine-codoped Ti-SBA-15

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