Lead oxide-modified TiO2 photocatalyst: tuning light absorption and charge carrier separation by lead oxidation state

Iwaszuk, Anna; Nolan, Michael

doi:10.1039/c3cy00194f

Cited by 37 publications

(49 citation statements)

References 47 publications

(85 reference statements)

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“…(a), (b): reproduced from [86] , 2013, The Royal Society of Chemistry (c), (d): reproduced from [87] , 2013, The Royal Society of Chemistry…”

Section: + To Induce Visible Light Absorptionmentioning

confidence: 99%

“…These are characterised by a distorted atomic structure that has been described in detail over the last decade [104,105] detailed results for other SnOx and PbOx nanoclusters on anatase and rutile are described in refs. [86,87,90,91] . All SnOx and PbOx nanoclusters adsorb strongly at the anatase (001) [105] .…”

Section: + To Induce Visible Light Absorptionmentioning

confidence: 99%

“…Valentin and Selloni described this model for anatase [82] (see also refs [83,84] ) and we have used it extensively in understanding different modifications of TiO2 with nanoclusters [81,[85][86][87] . Figure 7 shows the spin density from the relaxed triplet state for a selection of free and supported TiO2 nanoclusters; ref [81] shows a more extensive set of nanoclusters and see also ref [88] for high level DFT results on electron-hole localisation in TiO2 nanoclusters, showing consistency between the different DFT approaches and models.…”

Section: Tio2 Nanocluster Modified Rutile Tio2 As a Model System For mentioning

confidence: 99%

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Design of Novel Visible Light Active Photocatalyst Materials: Surface Modified TiO₂

et al. 2016

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Type of publicationArticle (peer-reviewed) AbstractThis progress review describes our work on the design of new TiO2 based photocatalysts. The key concept is the formation of composite structures through the modification of anatase and rutile TiO2 with molecular-sized nanoclusters of metals oxides. Our density functional theory (DFT) level simulations have been compared with experimental work synthesizing and characterizing surface modified TiO2. We use DFT to show that nanoclusters of metal oxides such as TiO2, SnO/SnO2, PbO/PbO2, ZnO and CuO are stable when adsorbed at rutile and anatase surfaces and can lead to a significant red shift in the absorption edge which will induce visible light absorption; this is the first requirement for a useful photocatalyst. We determine the origin of the red shift and the fate of excited electrons and holes. For p-block metal oxides the oxidation state of Sn and Pb can be used to modify the magnitude of the red shift and its mechanism. We describe comparisons of recent experimental studies of surface modified TiO2 that validate our DFT simulations. These nanocluster-modified TiO2 structures 2 form the basis of a new class of photocatalysts which will be useful in oxidation reactions and with a correct choice of nanocluster modified can be applied to other reactions.

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“…(a), (b): reproduced from [86] , 2013, The Royal Society of Chemistry (c), (d): reproduced from [87] , 2013, The Royal Society of Chemistry…”

Section: + To Induce Visible Light Absorptionmentioning

confidence: 99%

Section: + To Induce Visible Light Absorptionmentioning

confidence: 99%

Section: Tio2 Nanocluster Modified Rutile Tio2 As a Model System For mentioning

confidence: 99%

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Design of Novel Visible Light Active Photocatalyst Materials: Surface Modified TiO₂

et al. 2016

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“…It has been reported that the Nb sited at the bulk and Pb enriched near the surface could contribute to the visible light absorption. The Pd loaded on the surface could capture the excited electrons and improve the charge separation . In addition, the porosity and surface area of the samples were examined by N 2 sorption experiments; the N 2 sorption isotherm curves are shown in Figure S5 (Supporting Information).…”

Section: Resultsmentioning

confidence: 99%

“…The Pd loaded on the surface could capturet he excited electrons and improve the charges eparation. [61][62][63] In addition, the porosity and surfacea rea of the samples were examined by N 2 sorptione xperiments;t he N 2 sorption isotherm curves are shown in Figure S5 (Supporting Information). The calculated specific surface area (S BET )a nd pore volume of the samples were approximately 30.53-32.77 m 2 g À1 and 0.274-0.285cm 3 g À1 ,respectively.…”

Section: Resultsmentioning

confidence: 99%

From E‐Waste to Nb‐Pb Co‐Doped and Pd‐Loaded TiO₂/BaTiO₃ Heterostructure: Highly Efficient Photocatalytic Performance

Niu

2019

ChemSusChem

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A new and sustainable process was reported for the in situ synthesis of Nb‐Pb co‐doped and Pd‐loaded TiO2/BaTiO3 nanometer heterostructures from waste multilayer ceramic capacitors through a simple chlorination–leaching route. The particle size of the Nb‐Pb co‐doped heterostructure and the Pd loading were 20–50 nm and less than 5 nm, respectively. The bandgaps of the prepared samples were in the range 2.81–2.92 eV. The optimal simulated‐sunlight photocatalytic H2 production rate and Rhodamine B degradation rate of the prepared heterostructure could reach 576.8 μmol g−1 h−1 and 0.29911 min−1, respectively, which were approximately 11.3 and 19.1 times higher than those of commercial TiO2, and 5.96 and 8.91 times higher than those of bare TiO2/BaTiO3. The recycled heterostructure exhibited excellent photostability and reusability. Such superior photocatalytic performance of the sample was attributed to the formation of the heterostructure, the Nb‐Pb co‐doping, and the Pd loading, which enhanced the visible light absorption and charge separation efficiency. Furthermore, DFT calculations were applied to explore the enhanced mechanism. This study demonstrates a sustainable process for the conversion of e‐waste to a high‐value‐added and highefficiency photocatalyst, which has the advantages of waste utilization, low‐cost preparation, and environmental protection.

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Insights into Photocatalysis from Computational Chemistry

Rhatigan

Nolan

2021

Heterogeneous Photocatalysis

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Lead oxide-modified TiO2 photocatalyst: tuning light absorption and charge carrier separation by lead oxidation state

Cited by 37 publications

References 47 publications

Design of Novel Visible Light Active Photocatalyst Materials: Surface Modified TiO₂

Design of Novel Visible Light Active Photocatalyst Materials: Surface Modified TiO₂

From E‐Waste to Nb‐Pb Co‐Doped and Pd‐Loaded TiO₂/BaTiO₃ Heterostructure: Highly Efficient Photocatalytic Performance

Insights into Photocatalysis from Computational Chemistry

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Lead oxide-modified TiO2 photocatalyst: tuning light absorption and charge carrier separation by lead oxidation state

Cited by 37 publications

References 47 publications

Design of Novel Visible Light Active Photocatalyst Materials: Surface Modified TiO2

Design of Novel Visible Light Active Photocatalyst Materials: Surface Modified TiO2

From E‐Waste to Nb‐Pb Co‐Doped and Pd‐Loaded TiO2/BaTiO3 Heterostructure: Highly Efficient Photocatalytic Performance

Insights into Photocatalysis from Computational Chemistry

Contact Info

Product

Resources

About

Design of Novel Visible Light Active Photocatalyst Materials: Surface Modified TiO₂

Design of Novel Visible Light Active Photocatalyst Materials: Surface Modified TiO₂

From E‐Waste to Nb‐Pb Co‐Doped and Pd‐Loaded TiO₂/BaTiO₃ Heterostructure: Highly Efficient Photocatalytic Performance