Structural and nano-composite features of TiO2–Al2O3 powders prepared by sol–gel method

Ahmed, Mahmoud Ali; Abdel-Messih, M. F.

doi:10.1016/j.jallcom.2010.10.172

Cited by 73 publications

(42 citation statements)

References 39 publications

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“…Since initial studies by Fujishima and Honda, 1 heterogeneous photocatalysis 2 has attracted considerable attention due to its many technological applications, such as H 2 production, [3][4][5] CO 2 reduction, 6-8 environmental remediation, [9][10][11][12] among others. TiO 2 has been widely used in heterogeneous photocatalysis due its low cost, low toxicity, chemical and photochemical stability, usually expressive photocatalytic activity and versatility.…”

Section: Introductionmentioning

confidence: 99%

“…Several strategies have been employed to overcome this limitation, including doping 3 and production of nanocomposites. 9,[12][13][14] TiO 2 -based photocatalysis has been specially used in environmental remediation for the removal of recalcitrant and hazardous organic pollutants in wastewater. 9,15 The radicals produced from its excitation by light are able to efficiently oxidize organic pollutants leading in some cases to a complete mineralization of the organic matter.…”

Section: Introductionmentioning

confidence: 99%

“…Paracetamol (N-acetyl-p-aminophenol, PCT), Figure 1a, among other pharmaceutical products, their metabolites, pesticides, hormones and herbicides, 9,[16][17][18][19][20] is calling attention due to its persistence in the environment and the inability of the sewage treatment plants in removing this contaminant, which may result in bioaccumulation and harmful consequences for ecosystems. 17,[20][21][22] Although PCT is metabolized mainly by the liver, up to 68% of this drug tends to be excreted in the urine when ingested within permitted levels.…”

Section: Introductionmentioning

confidence: 99%

“…9,[12][13][14] TiO 2 -based photocatalysis has been specially used in environmental remediation for the removal of recalcitrant and hazardous organic pollutants in wastewater. 9,15 The radicals produced from its excitation by light are able to efficiently oxidize organic pollutants leading in some cases to a complete mineralization of the organic matter.Paracetamol (N-acetyl-p-aminophenol, PCT), Figure 1a, among other pharmaceutical products, their metabolites, pesticides, hormones and herbicides, 9,16-20 is calling attention due to its persistence in the environment and the inability of the sewage treatment plants in removing this contaminant, which may result in bioaccumulation and harmful consequences for ecosystems. 17,[20][21][22] Although PCT is metabolized mainly by the liver, up to 68% of this drug tends to be excreted in the urine when ingested within permitted levels.…”

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Efficient Mineralization of Paracetamol Using the Nanocomposite TiO₂/Zn(II) Phthalocyanine as Photocatalyst

França¹,

Santos²,

Silva³

et al. 2016

Journal of the Brazilian Chemical Society

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The photocatalytic performance of a composite based on the association of TiO 2 and 2.5 wt.% of zinc(II) phthalocyanine (TiO 2 /ZnPc) was evaluated towards the mineralization of paracetamol and compared to that observed for the bare oxide in different pH and H 2 O 2 concentrations. The results show that the photocatalytic performances were influenced by the pH, with maximum efficiency around the isoelectric point. Mineralization efficiencies between 86-91% was obtained using TiO 2 /ZnPc in pH 5.5-6.8, with 33 mg L -1 of H 2 O 2 , ca. 15% higher than that observed with TiO 2 . The mineralization efficiencies using bare TiO 2 and TiO 2 /ZnPc were respectively 112 and 18% lower in the absence of H 2 O 2 . The better performance of TiO 2 /ZnPc is related to its extended light absorption and non-uniform coating of the TiO 2 surface by ZnPc aggregates. Above pH 6.8, the mineralization efficiencies decrease for both photocatalysts, although the consumption of H 2 O 2 remains above 90%, due to its decomposition in alkaline pH.Keywords: mineralization, paracetamol, heterogeneous photocatalysis, role of pH and hydrogen peroxide, TiO 2 /zinc(II) phthalocyanine nanocomposite IntroductionSince initial studies by Fujishima and Honda, 1 heterogeneous photocatalysis 2 has attracted considerable attention due to its many technological applications, such as H 2 production, 3-5 CO 2 reduction, 6-8 environmental remediation, 9-12 among others. TiO 2 has been widely used in heterogeneous photocatalysis due its low cost, low toxicity, chemical and photochemical stability, usually expressive photocatalytic activity and versatility. 2,10,12,13 Its main limitation as photocatalyst is related to the lack of absorption in the visible region, which limits its use under solar irradiation. Several strategies have been employed to overcome this limitation, including doping 3 and production of nanocomposites. 9,[12][13][14] TiO 2 -based photocatalysis has been specially used in environmental remediation for the removal of recalcitrant and hazardous organic pollutants in wastewater. 9,15 The radicals produced from its excitation by light are able to efficiently oxidize organic pollutants leading in some cases to a complete mineralization of the organic matter.Paracetamol (N-acetyl-p-aminophenol, PCT), Figure 1a, among other pharmaceutical products, their metabolites, pesticides, hormones and herbicides, 9,16-20 is calling attention due to its persistence in the environment and the inability of the sewage treatment plants in removing this contaminant, which may result in bioaccumulation and harmful consequences for ecosystems. 17,[20][21][22] Although PCT is metabolized mainly by the liver, up to 68% of this drug tends to be excreted in the urine when ingested within permitted levels. [21][22][23][24] It should be emphasized that one of the routes of paracetamol metabolism produces highly toxic metabolites able to bind covalently to cysteine present in proteins. 23,25Figure 1. Chemical structure of PCT (a) and Zn(II) phthalocyanine (b). França e...

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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Efficient Mineralization of Paracetamol Using the Nanocomposite TiO₂/Zn(II) Phthalocyanine as Photocatalyst

França¹,

Santos²,

Silva³

et al. 2016

Journal of the Brazilian Chemical Society

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“…Al 2 O 3 /TiO 2 composites can be used as thermal-resistant parts, catalysts, wear-resistant coatings, and lubricative additives [1][2][3][4][5][6][7][8]. However, homogeneous distribution of the constituents Al 2 O 3 and TiO 2 remains a big challenge to fabricate composites of high performance.…”

Section: Introductionmentioning

confidence: 99%

Al2O3/TiO2 core/shell powder derived by novel sol–gel routes

Yang

Long

Qiu

et al. 2015

J Sol-Gel Sci Technol

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Novel sol-gel process is introduced to fabricate Al 2 O 3 /TiO 2 powder. Inorganic salt other than expensive alkoxide is used as precursors. Core/shell structure is achieved by dropwise addition of TiO 2 sol into Al 2 O 3 sol, and ultrafine raw powders are not utilized as cores in the one-pot process. The phase evolution, microstructure, surface composition, and particle size changes in the core/ shell structure powders are characterized. Upon calcination, the anatase-to-rutile transformation of TiO 2 phase occurs at low temperature due to the oxygen vacancies of adjacent Al 2 O 3 . TEM image shows the core/shell morphology of the powder, and (110) and (101) planes of Al 2 O 3 /TiO 2 are detected in the interface from HRTEM image. EDS and XPS spectra verify that the Al 2 O 3 core is fully covered by a thin TiO 2 layer. The average particle size decreases slightly due to the volume reduction caused by the anatase-to-rutile and c-to-a Al 2 O 3 transformations, which increase slightly at 1050°C due to solid phase sintering of the composite powder. Graphical Abstract

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Highly stable Ni/ZnO‐Al₂O₃ adsorbent promoted by TiO₂ for reactive adsorption desulfurization

Liu

Peng

Yang

et al. 2021

EcoMat

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The reactive adsorption desulfurization is an important and efficient technology for the ultra‐deep desulfurization of gasoline. The performance of an adsorbent is vital for the efficiency of the reactive adsorption desulfurization process. The formation of inert spinels is commonly recognized for the deactivation of adsorbents. In this work, TiO2 was incorporated in the Ni/ZnO‐Al2O3 adsorbent to inhibit the formation of the spinel phase. The TiO2 formed a stable protection layer on the surface of Al2O3, which prevented the interaction between Al2O3 and ZnO, inhibiting the formation of the ZnAl2O4 spinel phase. The introduction of TiO2 significantly improved the stability of the adsorbents during cyclic hydrothermal treatments, while the sulfur capacity slightly dropped. Characterization results revealed that TiO2 was homogeneously dispersed on the surface of Al2O3 support and the incorporation of TiO2 could maintain a certain amount of Lewis acid sites in the adsorbents, which are favorable for the adsorption of organo‐sulfur compounds.

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Structural and nano-composite features of TiO2–Al2O3 powders prepared by sol–gel method

Cited by 73 publications

References 39 publications

Efficient Mineralization of Paracetamol Using the Nanocomposite TiO₂/Zn(II) Phthalocyanine as Photocatalyst

Efficient Mineralization of Paracetamol Using the Nanocomposite TiO₂/Zn(II) Phthalocyanine as Photocatalyst

Al2O3/TiO2 core/shell powder derived by novel sol–gel routes

Highly stable Ni/ZnO‐Al₂O₃ adsorbent promoted by TiO₂ for reactive adsorption desulfurization

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Structural and nano-composite features of TiO2–Al2O3 powders prepared by sol–gel method

Cited by 73 publications

References 39 publications

Efficient Mineralization of Paracetamol Using the Nanocomposite TiO2/Zn(II) Phthalocyanine as Photocatalyst

Efficient Mineralization of Paracetamol Using the Nanocomposite TiO2/Zn(II) Phthalocyanine as Photocatalyst

Al2O3/TiO2 core/shell powder derived by novel sol–gel routes

Highly stable Ni/ZnO‐Al2O3 adsorbent promoted by TiO2 for reactive adsorption desulfurization

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Efficient Mineralization of Paracetamol Using the Nanocomposite TiO₂/Zn(II) Phthalocyanine as Photocatalyst

Efficient Mineralization of Paracetamol Using the Nanocomposite TiO₂/Zn(II) Phthalocyanine as Photocatalyst

Highly stable Ni/ZnO‐Al₂O₃ adsorbent promoted by TiO₂ for reactive adsorption desulfurization