Annealing temperature effects on sol–gel nanostructured mesoporous TiO2/SiO2 and its photocatalytic activity

Strauss, Mathias; Maroneze, Camila M.; Silva, Juliana M. de Souza e; Sígoli, Fernando Aparecido; Gushikem, Yoshitaka; Mazali, Ítalo Odone

doi:10.1016/j.matchemphys.2010.11.041

Cited by 20 publications

(5 citation statements)

References 42 publications

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“…Unlike in the case of the pristine δ-MnO 2 , where well-resolved lattices fringes were observed along the (001) plane of the nanostrand (Figure c), a reduction in lattice periodicity and long-range order was observed in the doped catalysts (Figure f,i). This could be attributable to structural defects due to lattice distortions, , possibly resulting from incorporation of the dopants into the lattice structure of δ-MnO 2 . A higher degree of lattice distortion was observed on 0.05Co-δ-MnO 2 compared to 0.05Cu-δ-MnO 2 , likely indicating a higher level of Co incorporation.…”

Section: Results and Discussionmentioning

confidence: 99%

Opposite Effects of Co and Cu Dopants on the Catalytic Activities of Birnessite MnO₂ Catalyst for Low-Temperature Formaldehyde Oxidation

et al. 2020

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Defect engineering is an effective strategy to enhance the activity of catalysts for various applications. Herein, it was demonstrated that in addition to enhancing surface properties via doping, the influence of dopants on the surface–intermediate interaction is a critical parameter that impacts the catalytic activity of doped catalysts for low-temperature formaldehyde (HCHO) oxidation. The incorporation of Co into the lattice structure of δ-MnO2 led to the generation of oxygen vacancies, which promoted the formation of surface active oxygen species, reduced activation energy, and enhanced catalytic activity for low-temperature oxidation of HCHO. On the contrary, Cu doping led to a drastic suppression of the catalytic activity of δ-MnO2, despite its enhanced redox properties and slight increase in the surface concentration of active oxygen species, compared to pristine δ-MnO2. Diffuse reflectance infrared Fourier transform analysis revealed that in the presence of Cu, carbonate intermediate species accumulate on the surface of the catalysts, leading to partial blockage of active sites and suppression of catalytic activity.

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Section: Results and Discussionmentioning

confidence: 99%

Opposite Effects of Co and Cu Dopants on the Catalytic Activities of Birnessite MnO₂ Catalyst for Low-Temperature Formaldehyde Oxidation

et al. 2020

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“…Also, SiO 2 is used as a support to increase the specific surface area. Accordingly, using a mixture of glass powder, as a main constituent of SiO 2 , with TiO 2 often leads to an increase in the surface area and could improve the photocatalytic activity of the final produced catalyst (Zhang et al 1998;Strauss et al 2011;Mahltig et al 2011). Results in Table 7.1 revealed that high removal efficiency of all heavy metals (Pb, Cd, Cu and Zn) was observed when using the modified catalyst (GB/TiO 2 ), while the GB adsorbent showed less removal efficiency of the metals.…”

Section: Effect Of Adsorption (Gb) and Photocatalysis (Gb/tio 2 ) On mentioning

confidence: 99%

Photocatalytic Degradation of Divalent Metals under Sunlight Irradiation Using Nanoparticle TiO2 Modified Concrete Materials (Recycled Glass Cullet)

Rashed

2015

Recent Progress in Desalination, Environmental and Marine Outfall Systems

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Tackling water shortage issues with the desalination of seawater and salty water is common in desert nations. Recently, new methodologies have been developed based on using nanotechnology for water desalination. Updating the field of water treatment by the photochemical technique has led to an important development in oxidative degradation processes applying titanium dioxide (TiO 2) as a catalyst. Searching for low-cost technologies for materials science applications, glass waste was used as an adsorbent and a promoting catalyst for photocatalytic oxidation of pollutants under sunlight irradiation source. In this study the newlyexplored nanocomposite TiO 2 catalyst supported with recycled glass cullet, derived from crushed waste beverage bottles (as adsorbent), was used as a promising alternative catalyst material for the removal of Cd, Cu, Pb and Zn from water. The effects of various parameters (adsorbent and catalyst dose, solution pH, contact time and initial metal concentration) on metal-removal efficiency were investigated. The results revealed a higher removal percentage of metals using glass cullet/ TiO 2 (GB/TiO 2 ) than GB as low-cost materials for water treatment. IntroductionIncreased demand for water is a global problem and clean water represents an essential necessity of human life. With only 3 % of all the available water on the planet being fresh water, seawater can be another source made available for drinking water with innovations in the development of novel technologies to desalinate water being a promising method (Mona 2010).

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“… 7,8 These synthesis routes usually proceed through the formation of an amorphous phase, which then requires higher-temperature treatment and the use of additives to form nanocrystalline phases of titania. 9 …”

Section: Introductionmentioning

confidence: 99%

Structure of the amorphous titania precursor phase of N-doped photocatalysts

2021

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Annealing temperature effects on sol–gel nanostructured mesoporous TiO2/SiO2 and its photocatalytic activity

Cited by 20 publications

References 42 publications

Opposite Effects of Co and Cu Dopants on the Catalytic Activities of Birnessite MnO₂ Catalyst for Low-Temperature Formaldehyde Oxidation

Opposite Effects of Co and Cu Dopants on the Catalytic Activities of Birnessite MnO₂ Catalyst for Low-Temperature Formaldehyde Oxidation

Photocatalytic Degradation of Divalent Metals under Sunlight Irradiation Using Nanoparticle TiO2 Modified Concrete Materials (Recycled Glass Cullet)

Structure of the amorphous titania precursor phase of N-doped photocatalysts

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Annealing temperature effects on sol–gel nanostructured mesoporous TiO2/SiO2 and its photocatalytic activity

Cited by 20 publications

References 42 publications

Opposite Effects of Co and Cu Dopants on the Catalytic Activities of Birnessite MnO2 Catalyst for Low-Temperature Formaldehyde Oxidation

Opposite Effects of Co and Cu Dopants on the Catalytic Activities of Birnessite MnO2 Catalyst for Low-Temperature Formaldehyde Oxidation

Photocatalytic Degradation of Divalent Metals under Sunlight Irradiation Using Nanoparticle TiO2 Modified Concrete Materials (Recycled Glass Cullet)

Structure of the amorphous titania precursor phase of N-doped photocatalysts

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Opposite Effects of Co and Cu Dopants on the Catalytic Activities of Birnessite MnO₂ Catalyst for Low-Temperature Formaldehyde Oxidation

Opposite Effects of Co and Cu Dopants on the Catalytic Activities of Birnessite MnO₂ Catalyst for Low-Temperature Formaldehyde Oxidation