Enhancement of photocatalytic degradation of dimethyl phthalate with nano-TiO2 immobilized onto hydrophobic layered double hydroxides: A mechanism study

Huang, Zhujian; Wu, Pingxiao; Lu, Yonghong; Wang, Xiaorong; Zhu, Ning; Dang, Zhi

doi:10.1016/j.jhazmat.2012.12.016

Cited by 106 publications

(30 citation statements)

References 37 publications

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“…MgAl [37]. The band-gap energy (E g ) was determined by the Tauc relation using the transformed Kulbelka-Munk function according to the following equations: [48] n Eg) calcined hydrotalcite that also observed in other studies [29,34].…”

Section: X-ray Diffractionmentioning

confidence: 98%

“…10) also resulted in the highest TOC reduction, reaching about 80% after 360 min. M a n u s c r i p t 20 Allied to this, the hydroxyl groups present in the LDH structure can react with the photogenerated hole in the VB of TiO 2 , and thereby promote the production of • OH [37,41,59].…”

Section: X-ray Diffractionmentioning

confidence: 99%

“…However, there is a decrease in the intensity of the reflection peaks, related to the LDH. This is probably due to the disorder caused by the randon incorporation of TiO 2 nanoparticles inside the LDH lamellar structure can lead to broad peaks and a low intensity[20,21,36,37] One can also observe an increase in the (003) inter-layer distance from 7.69 (MgAl-CO 3 ) to 7.72 Å (TiO 2 /MgAl-CO 3 ) and from 7.59 Å in MgZnAl-CO 3 -5 to 7.62 Å in TiO 2 /MgZnAl-CO 3 -5 caused by TiO 2 incorporation .INSERT FIG. 3…”

mentioning

confidence: 99%

“…4 . 5A shows the micrograph of the non-calcined photocatalyst TiO 2 /MgZnAl-CO 3 -5 where there is a random coating of the LDH layers of the MgZnAl-5 by the nanoparticles of TiO 2 forming agglomerates with a spongy appearance which are responsible by increasing the heterogeneity of the surface of the photocatalysts[37,41]. After the calcination(Fig.…”

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confidence: 99%

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Enhanced photocatalytic activity of TiO2-impregnated with MgZnAl mixed oxides obtained from layered double hydroxides for phenol degradation

Almeida

Bellato

Mounteer

et al. 2015

Applied Surface Science

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Highlight► The catalysts composite TiO 2 /MgZnAl-5, was more efficient than TiO 2 P25.► The effects of different molar ratios zinc on the photocatalysts were investigated.► Synergistic effect between constituents of TiO 2 /MgZnAl-5 increases the photocatalysis.► TiO 2 /MgZnAl-5 exhibited the adsorption of light displacing the greater wavelength.► The catalyst composite TiO 2 /MgZnAl-5 can be reused for five consecutive cycles. AbstractPage 2 of 34 A c c e p t e d M a n u s c r i p t 2 A series of TiO 2 /MgZnAl photocatalysts, were successfully synthesized from ternary (Mg, Zn and Al) layered double hydroxides impregnated with TiO 2 nanoparticles by the co-precipitation method at variable pH with different Zn 2+ /Mg 2+ molar ratios . The composite photocatalysts were calcined at 500 °C resulting in the incorporation of oxide zinc, in the calcined MgZnAl LDH structure. Synergistic effect between ZnO and TiO 2 lead to significant enhancement of TiO 2 /MgZnAl photocatalytic activity. Composite photocatalysts were characterized by ICP-MS, N 2 adsorption/desorption, XRD, SEM, EDS, IR and UV-Vis DRS. Phenol in aqueous solution (50 mg/L) was used as a model compound for evoluation of UV-Vis (filter cutoff for λ > 300 nm) photocatalytic activity . The most efficient phocatalyst composite was obtained at a 5% Zn 2+ /Mg 2+ molar ratio , in the catalyst identified as TiO 2 /MgZnAl-5. This composite catalyst had high photocatalytic activity, completely destroying phenol and removing 80% of total organic carbon in solution after 360 min.The TiO 2 /MgZnAl-5 catalyst remained relatively stable, presenting a 15% decrease in phenol degradation efficiency after five consecutive photocatalytic cycles.

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Section: X-ray Diffractionmentioning

confidence: 98%

Section: X-ray Diffractionmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Enhanced photocatalytic activity of TiO2-impregnated with MgZnAl mixed oxides obtained from layered double hydroxides for phenol degradation

Almeida

Bellato

Mounteer

et al. 2015

Applied Surface Science

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“…The loading amount of TiO 2 on the photocatalytic properties of TiO 2 /ZnAlLDHs nanocomposites was further studied [62], which showed a great influence on the interactions between ZnAl-LDH and TiO 2 . A proper TiO 2 loading can ensure the stability of photocatalytic system, constrain the undesired LDH memory effect, Fig.…”

Section: Ldh-based Nanocomposites For Photocatalysismentioning

confidence: 99%