Boosted Visible-Light Photodegradation of Methylene Blue by V and Co Co-Doped TiO2

Lv, Tianping; Zhao, Jianhong; Chen, Mingpeng; Shen, Kaiyuan; Zhang, Dongming; Zhang, Jin; Zhang, Genlin; Liu, Qingju

doi:10.3390/ma11101946

Cited by 47 publications

(18 citation statements)

References 39 publications

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“…Research into new coating materials has become an urgent task in protecting stone-built cultural heritage. Nano-TiO 2 has shown potential applicability, owing to its good stability, non-toxicity, and low price [18][19][20]. In 1992, Skoulikidis proposed the possibility of using TiO 2 as a protective stone coating by establishing a model [21].…”

Section: Introductionmentioning

confidence: 99%

Study of TiO2-Modified Sol Coating Material in the Protection of Stone-Built Cultural Heritage

et al. 2020

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Coating materials can effectively protect stone-built cultural heritage and, as such, research into coating materials has gained comprehensive attention from researchers. The aim of this work is to prepare a TiO 2 -modified sol coating material (TSCM) and study its protective effects on stone-built cultural heritage. TSCM and pure TiO 2 sol (p-sol, unmodified; for comparison) were applied evenly over the entire surface of stone samples. The prepared stone samples included untreated stone, stone treated with pure sol, and stone treated with TSCM. The protective effects of TSCM were evaluated by water absorption, water vapor permeability, acid resistance, and weather resistance experiments. The results show that stone treated with TSCM has excellent water absorption and water vapor permeability, strong acid resistance, and good weather resistance, compared with untreated stone or stone treated with p-sol. The acid resistance of stone treated by TSCM was 1.75 times higher than that treated with traditional coating materials. The weather resistance cycle number of stone treated by TSCM was four times higher than that treated with organic protective materials. These findings are expected to provide useful suggestions for the protection of stone-built cultural heritage.Coatings 2020, 10, 179 2 of 11 or added to acrylic polymers [22][23][24], but they could be easily removed from the coating surface owing to weak bonding [25][26][27]. In order to avoid the loss of TiO 2 nanoparticles, some researchers have proposed to composite TiO 2 nanoparticles into a SiO 2 -sol [28], which can enhance its photocatalytic activity when applied to a building. To the best of our knowledge, there have been no scientific studies about compositing TiO 2 nanoparticles into a TiO 2 -sol for the protection of stone-built cultural heritage. More importantly, the method presented in the work of [28] provides us with valuable suggestions about the protection of stone-built cultural heritage. Hence, it is necessary to investigate a modified TiO 2 -sol with significant protective effect on stone-built cultural heritage.The aim of this paper is to prepare a TiO 2 -modified sol coating material (TSCM) that is capable of protecting stone-built cultural heritage. Analyses of the composition and microscopic morphology of TSCM were conducted using X-ray diffraction (XRD) and scanning electron microscopy (SEM). Some experiments were conducted to evaluate the protective effects of TSCM, in terms of wettability, weather resistance, and acid resistance. The results suggest that TSCM has excellent water absorption, water vapor permeability, acid resistance, and weather resistance. The study, therefore, provides a new method for the protection of stone-built cultural heritage.

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Section: Introductionmentioning

confidence: 99%

Study of TiO2-Modified Sol Coating Material in the Protection of Stone-Built Cultural Heritage

et al. 2020

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“…Apart from Ti 3+ ions, other transition metals, such as copper (Cu), vanadium (V), chromium (Cr), manganese (Mn), iron (Fe) and nickel (Ni), are typically employed to enhance the visible-light photocatalytic activity of titania [88][89][90][91][92][93][94][95][109][110][111][112][113][114][115]. The redshift effectiveness takes the following order: V > Cr > Mn > Fe > Ni [86].…”

Section: Metal Dopingmentioning

confidence: 99%

“…This is typically termed the 'co-doping'. The enhancement in the photocatalytic activity of co-doped TiO 2 is attributed to the synergistic effect of the dopants in increasing visible light absorption, thus facilitating electron-hole generation and suppressing the recombination rate [90,[113][114][115]. Very recently, Aviles-Garcia et al synthesized W and Mo co-doped TiO 2 , and reported that the nanocomposite with the W:Mo = 1:1 ratio having a bandgap of 2.87 eV exhibits a synergistic effect between the dopants to generate more hydroxyl radicals for degrading 4-chlorophenol.…”

Section: Metal Dopingmentioning

confidence: 99%

Visible-Light Active Titanium Dioxide Nanomaterials with Bactericidal Properties

2020

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This article provides an overview of current research into the development, synthesis, photocatalytic bacterial activity, biocompatibility and cytotoxic properties of various visible-light active titanium dioxide (TiO2) nanoparticles (NPs) and their nanocomposites. To achieve antibacterial inactivation under visible light, TiO2 NPs are doped with metal and non-metal elements, modified with carbonaceous nanomaterials, and coupled with other metal oxide semiconductors. Transition metals introduce a localized d-electron state just below the conduction band of TiO2 NPs, thereby narrowing the bandgap and causing a red shift of the optical absorption edge into the visible region. Silver nanoparticles of doped TiO2 NPs experience surface plasmon resonance under visible light excitation, leading to the injection of hot electrons into the conduction band of TiO2 NPs to generate reactive oxygen species (ROS) for bacterial killing. The modification of TiO2 NPs with carbon nanotubes and graphene sheets also achieve the efficient creation of ROS under visible light irradiation. Furthermore, titanium-based alloy implants in orthopedics with enhanced antibacterial activity and biocompatibility can be achieved by forming a surface layer of Ag-doped titania nanotubes. By incorporating TiO2 NPs and Cu-doped TiO2 NPs into chitosan or the textile matrix, the resulting polymer nanocomposites exhibit excellent antimicrobial properties that can have applications as fruit/food wrapping films, self-cleaning fabrics, medical scaffolds and wound dressings. Considering the possible use of visible-light active TiO2 nanomaterials for various applications, their toxicity impact on the environment and public health is also addressed.

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“…This study uses the fabrication routes employed previously by us for the synthesis of undoped TiO 2 and monodoped Fe-TiO 2 , Co-TiO 2 , Mn-TiO 2 , and Ni-TiO 2 [13,14], which are described in detail below (Scheme 1). The environmental impacts were compared initially using a weight-based functional unit of 1 kg of nanoparticles, given that this can be used to compare the production of an equivalent amount of nanomaterial.…”

Section: Scope and System Boundariesmentioning

confidence: 99%

“…Given this, several authors have tried to develop visible-responsive TiO 2 photocatalysts by doping them with either metal ions and/or nonmetal ions, or by the creation of hetero-junctions with other semiconductors [4,11,12]. Among these strategies, transition-metal doping has been shown to be quite effective [12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Life Cycle Assessment of the Sustainability of Enhancing the Photodegradation Activity of TiO2 with Metal-Doping

Fernandes

Silva

2020

Materials

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While TiO2 nanoparticles have shown potential as photocatalysts in the degradation of organic contaminants, their inability to absorb efficiently visible light has limited their industrial application. One strategy for solving this problem is monodoping TiO2 photocatalysts with transition metals, which has worked in the degradation of several pollutants. However, it is not clear if this improvement is enough to offset the potential environmental impacts of adding metal ions to the synthesis of TiO2. Herein, we have used Life Cycle Assessment (LCA) to determine the sustainability of monodoping TiO2 with transition metals (Fe, Co, Mn and Ni, with a 1% weight ratio) to enhance the photocatalytic properties of the photocatalyst toward the degradation of Carbamazepine and Methyl Orange, under UV-A and visible light irradiation. We found that the addition of transition-metals has no significant effect on the environmental impacts associated with the synthesis of TiO2, when a weight-based functional unit was considered. However, when photocatalytic activity was considered, major differences were found. Thus, our results demonstrate that the sustainability of monodoping with different transition metals is solely determined by their ability to enhance (or not) the photocatalytic activity of TiO2. Our data also demonstrated that isopropyl alcohol constitutes a critical point in the synthesis of TiO2 photocatalysts, with ethanol being a potential substitute.

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Boosted Visible-Light Photodegradation of Methylene Blue by V and Co Co-Doped TiO2

Cited by 47 publications

References 39 publications

Study of TiO2-Modified Sol Coating Material in the Protection of Stone-Built Cultural Heritage

Study of TiO2-Modified Sol Coating Material in the Protection of Stone-Built Cultural Heritage

Visible-Light Active Titanium Dioxide Nanomaterials with Bactericidal Properties

Life Cycle Assessment of the Sustainability of Enhancing the Photodegradation Activity of TiO2 with Metal-Doping

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