Enhancement of visible-light photoactivity by polypropylene coated plasmonic Au/TiO2 for dye degradation in water solution

D’Amato, Chiara Anna; Giovannetti, Rita; Zannotti, Marco; Rommozzi, Elena; Ferraro, Stefano; Seghetti, Chiara; Minicucci, Marco; Gunnella, R.; Cicco, Andrea Di

doi:10.1016/j.apsusc.2018.01.290

Cited by 81 publications

(38 citation statements)

References 58 publications

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“…However, some drawbacks limit the practical application of TiO 2 . For instance, fast h + /e − recombination [13]; the large bandgap energy of 3.2 eV can only be excited by ultraviolet light (UV) with a wavelength less than 387 nm [3,6,[14][15][16][17]. In recent years, scientists have advanced many strategies in order to further improve the photocatalytic performance of TiO 2 , such as doping with non-metallic elements, combining with metal ions, depositing noble metals, and creating heterojunctions with other semiconductors [12,[18][19][20][21][22].…”

mentioning

confidence: 99%

Reduced Graphene Oxide–P25 Nanocomposites as Efficient Photocatalysts for Degradation of Bisphenol A in Water

Bai

Yang

et al. 2019

Catalysts

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Reduced graphene oxide-titanium dioxide photocatalyst (rGO-TiO 2 ) was successfully synthesized by the hydrothermal method. The rGO-TiO 2 was used as photocatalyst for the degradation of bisphenol A (BPA), which is a typical endocrine disruptor of the environment. Characterization of photocatalysts and photocatalytic experiments under different conditions were performed for studying the structure and properties of photocatalysts. The characterization results showed that part of the anatase type TiO 2 was converted into rutile type TiO 2 after hydrothermal treatment and 1% rGO-P25 had the largest specific surface area (52.174 m 2 /g). Photocatalytic experiments indicated that 1% rGO-P25 had the best catalytic effect, and the most suitable concentration was 0.5 g/L. When the solution pH was 5.98, the catalyst was the most active. Under visible light, the three photocatalytic mechanisms were ranked as follows:1% rGO-P25 also had strong photocatalytic activity in the photocatalytic degradation of BPA under sunlight irradiation. 1% rGO-P25 with 0.5 g/L may be a very promising photocatalyst with a variety of light sources, especially under sunlight for practical applications.Catalysts 2019, 9, 607 2 of 15 out under normal temperature and pressure [10]; modern production cleaning process, where the energy source of this process is solar energy that cannot cause secondary pollution, and organic matter can be mineralized into clean energy such as H 2 O and CO 2 [11]; fast reaction rate, where organic pollutants can be destroyed completely within minutes to hours [12]. However, some drawbacks limit the practical application of TiO 2 . For instance, fast h + /e − recombination [13]; the large bandgap energy of 3.2 eV can only be excited by ultraviolet light (UV) with a wavelength less than 387 nm [3,6,[14][15][16][17]. In recent years, scientists have advanced many strategies in order to further improve the photocatalytic performance of TiO 2 , such as doping with non-metallic elements, combining with metal ions, depositing noble metals, and creating heterojunctions with other semiconductors [12,[18][19][20][21][22]. More recently, in contrast to other materials, graphene, graphene oxide (GO), and the graphene monolith formed by the stripping of GO, reduced graphene oxide (rGO) used in this experiment received wider attention because of its good mechanical strength, high electron mobility, chemical stability, optical properties, and high surface area [23][24][25][26][27]. Among them, rGO is a derivative of graphene and has a unique sp 2 hybrid carbon network [28]. The surface of the relatively inert graphene becomes extremely active due to the introduction of a large number of oxygen-containing functional groups such as hydroxyl group, epoxy group, carbonyl group, and a carboxyl group [29,30]. Therefore, the surface of graphene can also be connected to specific functions such as biomolecules, polymers, and inorganic particles [31]. The photocatalytic enhancement of rGO-TiO 2 composites can be attributed to three aspects: fi...

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confidence: 99%

Reduced Graphene Oxide–P25 Nanocomposites as Efficient Photocatalysts for Degradation of Bisphenol A in Water

Bai

Yang

et al. 2019

Catalysts

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“…This shows that the prepared TiO2 has the high activity (001) facets. The Figure 3b shows d = 0.235 nm and d = 0.245 nm spacings, corresponding to the (001) facets of TiO2 and the (111) surface of Cu2O, respectively [45], which shows that the prepared composite catalyst contains the high activity (001) facets.…”

Section: Crystal Facet Analysis Of Catalystsmentioning

confidence: 92%

Heterostructure Cu2O/(001)TiO2 Effected on Photocatalytic Degradation of Ammonia of Livestock Houses

Wang

Zhu

et al. 2019

Catalysts

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In this paper, a heterogeneous composite catalyst Cu2O/(001)TiO2 was prepared by the impregnation-reduction method. The crystal form, highly active facet content, morphology, optical properties, and the photogenerated electron-hole recombination rate of the as-prepared catalysts were investigated. The performance of Cu2O/(001)TiO2 was appraised by photocatalytic degradation of ammonia under sunlight and was compared with lone P25, Cu2O, and (001)TiO2 at the same reaction conditions. The results showed that 80% of the ammonia concentration (120 ± 3 ppm) was removed by Cu2O/(001)TiO2, which was a higher degradation rate than that of pure P25 (12%), Cu2O (12%), and (001)TiO2 (15%) during 120 min of reaction time. The reason may be due to the compound’s (Cu2O/(001)TiO2) highly active (001) facets content that increased by 8.2% and the band gap width decreasing by 1.02 eV. It was also found that the air flow impacts the photocatalytic degradation of ammonia. Therefore, learning how to maintain the degradation effect of Cu2O/(001)TiO2 with ammonia will be important in future practical applications.

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“…In the UV/VIS DRS spectra, h-TiO 2 showed absorption of visible light, which indicates the presence of Ti(III) and Ti atoms with even lower oxidation numbers (Supporting Information 2). The optical band gap of bare TiO 2 and h-TiO 2 were determined using Kubelka-Munk method [32,33], and they are 3.2 and 3.1 eV, respectively (Supporting Information 2). However, this was not verified by the Ti 2p spectra in XPS.…”

Section: Characterizations Of Samplesmentioning

confidence: 99%

Surface Modification of TiO2 for Obtaining High Resistance against Poisoning during Photocatalytic Decomposition of Toluene

et al. 2018

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Titanium oxide (TiO2) nanostructures, the most widely used photocatalysts, are known to suffer from poisoning of the active sites during photocatalytic decomposition of volatile organic compounds. Partially oxidized organic compounds with low volatility stick to the catalyst surface, limiting the practical application for air purification. In this work, we studied the UV-driven photocatalytic activity of bare TiO2 toward toluene decomposition under various conditions and found that surface deactivation is pronounced either under dry conditions or humid conditions with a very high toluene concentration (~442 ppm). In contrast, when the humidity was relatively high (~34 %RH) and toluene concentration was low (~66 ppm), such deactivation was not significant. We then modified TiO2 surfaces by deposition of polydimethylsiloxane and subsequent annealing, which yielded a more hydrophilic surface. We provide experimental evidence that our hydrophilic TiO2 does not show deactivation under the conditions that induce significant deactivation with bare TiO2. Conversion of toluene into dimethylacetamide was observed on the hydrophilic TiO2 and did not result in poisoning of active sites. Our hydrophilic TiO2 shows high potential for application in air purification for extended time, which is not possible using bare TiO2 due to the significant poisoning of active sites.

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Enhancement of visible-light photoactivity by polypropylene coated plasmonic Au/TiO2 for dye degradation in water solution

Cited by 81 publications

References 58 publications

Reduced Graphene Oxide–P25 Nanocomposites as Efficient Photocatalysts for Degradation of Bisphenol A in Water

Reduced Graphene Oxide–P25 Nanocomposites as Efficient Photocatalysts for Degradation of Bisphenol A in Water

Heterostructure Cu2O/(001)TiO2 Effected on Photocatalytic Degradation of Ammonia of Livestock Houses

Surface Modification of TiO2 for Obtaining High Resistance against Poisoning during Photocatalytic Decomposition of Toluene

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