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Search for "photocatalytic activity" in Full Text gives 113 result(s) in Beilstein Journal of Nanotechnology.
Nanomaterials for photocatalysis and applications in environmental remediation and renewable energy
Beilstein J. Nanotechnol. 2023, 14, 722–724, doi:10.3762/bjnano.14.58
- studies [20][21][22]. Besides, Nhu et al. [23] used rosin as a green chemical approach to fabricate ZnO nanoparticles, exhibiting a high photocatalytic activity for both methylene blue (100%) and methyl orange (82.78%) decomposition after 210 min under UV radiation. Moreover, the advantages in the
Titania nanoparticles for photocatalytic degradation of ethanol under simulated solar light
Beilstein J. Nanotechnol. 2023, 14, 616–630, doi:10.3762/bjnano.14.51
- differences in crystal structure are reflected in direct or indirect electron transitions. The bandgaps of anatase and rutile differ only by 0.2 eV, but can influence significantly the creation of electron–hole pairs, resulting in an increase of the photocatalytic activity. Anatase has a higher decomposition
- efficiency than rutile [14][31], while the highest photocatalytic activity has been found in mixed anatase/rutile TiO2 [13][32]. One possible explanation is that the difference in the crystal structure and chemical bonding results in different ionization potentials and electron affinities. Exploiting these
- ratio between anatase and rutile that yields the highest photocatalytic activity. Thus, the main scope of this study is to find the best process parameters for the pyrolysis synthesis of TiO2 powders. Another part is to obtain powders with specific mixtures of the crystallographic phases (anatase/rutile
Bismuth-based nanostructured photocatalysts for the remediation of antibiotics and organic dyes
Beilstein J. Nanotechnol. 2023, 14, 291–321, doi:10.3762/bjnano.14.26
- -light spectrum. Additionally, the reverse bond between the cation and anion is more favourable for the production and transportation of holes, which facilitates photocatalytic activity. Because of this, significant efforts have been made to synthesise bismuth-based nanomaterials (BiVO4, Bi5O7I-MoO3
- photocatalytic degradation of organic dyes and antibiotics in water. The general synthesis of nanometre-sized photocatalytic materials based on bismuth employing energy-efficient techniques is examined. A critical review is also given of ways to improve the photocatalytic activity of the photocatalysts. An
- charges and, hence, increase photocatalytic activity, metallic bismuth can function as a direct plasmonic photocatalyst (similar to Au and Ag) or a co-catalyst [77]. Also, the unique layered crystal structure of Aurivillius-type bismuth oxide-based semiconductors allows for the induction of an internal
Non-stoichiometric magnetite as catalyst for the photocatalytic degradation of phenol and 2,6-dibromo-4-methylphenol – a new approach in water treatment
Beilstein J. Nanotechnol. 2022, 13, 1531–1540, doi:10.3762/bjnano.13.126
- SEM reveals the maximum size of the particles. The catalytic activity of commercially available M1 and M2 was evaluated through the photocatalytic degradation of phenol and DBMP. The photocatalytic activity was compared with the efficiency of ozonolysis. The photocatalytic efficiency is improved by
- . Photocatalytic degradation of phenols The photocatalytic activity of M1 and M2 was evaluated by the photocatalytic degradation of PhOH and DBMP. First, 750 cm3 (1.064 × 10−3 mol·L−1) of aqueous phenol solution was placed into the reactor. The pH of the solution was adjusted to 8 ± 0.1 with 0.1 mol·L−1 NaOH. Then
A TiO2@MWCNTs nanocomposite photoanode for solar-driven water splitting
Beilstein J. Nanotechnol. 2022, 13, 1520–1530, doi:10.3762/bjnano.13.125
- photocatalytic activity in the studied potential window. This confirms that the combination of TiO2 and MWCNTs enhances the visible-light absorption of the nanocomposite, even under weak light illuminance (dark conditions), which leads to the enhancement of the current density of the TiO2@MWCNTs electrode. At
LED-light-activated photocatalytic performance of metal-free carbon-modified hexagonal boron nitride towards degradation of methylene blue and phenol
Beilstein J. Nanotechnol. 2022, 13, 1380–1392, doi:10.3762/bjnano.13.114
- conditions. The linear sweep voltammetry (LSV) studies were conducted under both dark and light conditions with a scanning speed of 5 mV/s. Photocatalytic activity The LED-light-driven photocatalysis experiments were performed in a 250 mL conical flask containing 50 mg of the as-synthesized material and 200
- photocatalytic process [24]. The MBN-80 also exhibited a lower LDB and charge transit time through the depletion layer (charge transit time ∝ (LDebye)2), meaning a lower recombination of the charge carriers leading to an enhanced photocatalytic activity [29]. The same could again be justified through the width
- . Furthermore, a substantial reduction in the photocatalytic activity was observed when AgNO3 and p-benzoquinone were added into the reaction system. The introduction of AgNO3 resulted in the capture of electrons from the reaction mixture which disrupts the generation of O2−• through the O2/O2−• reduction
Recent trends in Bi-based nanomaterials: challenges, fabrication, enhancement techniques, and environmental applications
Beilstein J. Nanotechnol. 2022, 13, 1316–1336, doi:10.3762/bjnano.13.109
- than Bi5+. The earlier compounds have been examined more thoroughly than the latter. The overlap of O 2p and Bi 6s orbitals in the valence band (VB) of Bi3+-containing compounds improves photogenerated charge mobility and, hence, improves photocatalytic activity [22][23]. Furthermore, except for BiOF
- times greater CO2 adsorption and enhanced light absorption. The enhanced properties were reflected in the photocatalytic activity, resulting in a rate of methanol synthesis of 75 mol·g−1·h−1, which was much greater than the rate produced by the unaltered Bi2WO6. As a result of the decrease in
- obtained. They found that Bi5O7Br effectively converts molecular oxygen to superoxide radicals and hydroxyl radicals in visible light. Under UV–vis irradiation, Bi5O7Br showed a higher photocatalytic activity in the degradation of rhodamine B (RhB) dye than BiOBr. The addition of Bi5O7Br photocatalysis to
Rapid fabrication of MgO@g-C3N4 heterojunctions for photocatalytic nitric oxide removal
Beilstein J. Nanotechnol. 2022, 13, 1141–1154, doi:10.3762/bjnano.13.96
- and urea and, subsequently, characterized. Charge transfer dynamics in the heterojunction and band structure were investigated to understand the effect of the heterojunction on the photocatalytic activity. Finally, the photocatalytic pathway of the MgO@g-C3N4 heterojunction was studied via trapping
- photocatalytic activity of as-prepared MgO@g-C3N4 was evaluated by monitoring NO degradation. The photocatalytic NO removal experiments were performed using a 4.5 L reaction chamber and a Xenon lamp (300 W) as the visible light source. The initial NO concentration was 500 ppb, the flow rate was 1.5 L·min−1, and
- bandgap reduction can be attributed to Mg−N bonds in the MgO@g-C3N4 materials, which promote charge transport, thus, increasing the photocatalytic efficiency [33][51]. Generally, smaller bandgaps lead to better light absorption, indicating the high photocatalytic activity of MgO@g-C3N4 under visible light
Green synthesis of zinc oxide nanoparticles toward highly efficient photocatalysis and antibacterial application
Beilstein J. Nanotechnol. 2022, 13, 1108–1119, doi:10.3762/bjnano.13.94
- photocatalysts. ZnO has a higher quantum efficiency than that of TiO2 since it absorbs more energy in the UV region [4][5][6][7]. Furthermore, ZnO is a low-cost photocatalyst with high photocatalytic activity, nontoxicity, light sensitivity, and stability [8][9][10]. The photodegradation of organic substances by
- hexagonal wurtzite structure form. The HR-TEM image showed the interplanar spacing of 0.251 ± 0.003 nm corresponding to the (101) crystal plane of ZnO, and the size of ZnO NPs is in the range of 30–100 nm. The bandgap energy of synthesized ZnO was 3.15 eV. Synthesized ZnO NPs showed high photocatalytic
- activity in dye degradation (methylene blue and methyl orange). The photodegradation efficiency of a dye solution by ZnO NPs under UV is greater than that under visible light. ZnO NPs completely degraded a MB solution of 10 mg/L for 210 min under ultraviolet light while the MB degradation efficiency
Spindle-like MIL101(Fe) decorated with Bi2O3 nanoparticles for enhanced degradation of chlortetracycline under visible-light irradiation
Beilstein J. Nanotechnol. 2022, 13, 1038–1050, doi:10.3762/bjnano.13.91
- solvothermal method to obtain a novel 0D/3D heterojunction Bi2O3/MIL101(Fe) (BOM). The morphology and optical properties of the as-prepared Bi2O3/MIL101(Fe) composite were characterized. The photocatalytic activity of the synthesized samples was evaluated by degrading chlortetracycline (CTC) under visible
- -light irradiation. The obtained BOM-20 composite (20 wt % Bi2O3/MIL101(Fe)) exhibits the highest photocatalytic activity with CTC degradation efficiency of 88.2% within 120 min. The degradation rate constant of BOM-20 toward CTC is 0.01348 min−1, which is 5.9 and 4.3 times higher than that of pristine
- Bi2O3 and MIL101(Fe), respectively. The enhanced photocatalytic activity is attributed to the formation of a Z-scheme heterojunction between Bi2O3 and MIL101(Fe), which is conducive to the rapid separation of photogenerated carriers and the enhancement of photogenerated electron and hole redox capacity
Solar-light-driven LaFexNi1−xO3 perovskite oxides for photocatalytic Fenton-like reaction to degrade organic pollutants
Beilstein J. Nanotechnol. 2022, 13, 882–895, doi:10.3762/bjnano.13.79
- Fenton reaction, a photo-Fenton reaction excited by ultraviolet light or visible light can achieve a faster reaction rate and a complete degree of oxidation [19]. Besides, it shows a positive relationship between light intensity and photocatalytic activity. With the assistance of light irradiation, the
- photocatalytic activity of LaFexNi1−xO3 photocatalysts was examined by evaluating the performance of photocatalytic MB degradation. 300 W Xe-lamp equipped with AM 1.5G filter (Newport Corporation, USA) was used as the light source in the degradation experiment. The light intensity was adjusted to 100 mW/cm2
Hierarchical Bi2WO6/TiO2-nanotube composites derived from natural cellulose for visible-light photocatalytic treatment of pollutants
Beilstein J. Nanotechnol. 2022, 13, 745–762, doi:10.3762/bjnano.13.66
- ][8]. However, the wide bandgap of TiO2 inhibits the absorption of light in the visible region and the rapid recombination of photogenerated electron−hole pairs restrains its photocatalytic activity. It has been verified that constructing TiO2-based heterostructured composites by using visible-light
Sodium doping in brookite TiO2 enhances its photocatalytic activity
Beilstein J. Nanotechnol. 2022, 13, 599–609, doi:10.3762/bjnano.13.52
- enhances its photocatalytic activity, which becomes three times higher than that of the quasi-spherical brookite TiO2. The results demonstrated that the sodium-doped brookite NaxTi1−xO2 can be stable up to 500 °C. At 600°C, the sodium in the brookite precipitates in the form of Na2CO3, and above 700 °C
- structure and produce microstructures such as the core–shell structure, local lattice distortion, interstitial atoms, and atomic vacancies, which are critical to its excellent photocatalytic activity. Keywords: brookite titanium dioxide; core–shell structure; photocatalytic activity; sodium doping; twins
- increased due to its importance for photocatalytic application. Ohtani et al. reported that extra-fine brookite TiO2 exhibited good photocatalytic activity for redox reactions in aqueous propan-2-ol and silver sulfate solution [7]. Kobayashi et al. suggested that the photoactivity of brookite nanoparticles
Zinc oxide nanostructures for fluorescence and Raman signal enhancement: a review
Beilstein J. Nanotechnol. 2022, 13, 472–490, doi:10.3762/bjnano.13.40
- combined with metal nanoparticles, resulting in enhanced photoactivity of Au-decorated ZnO nanocrystals for photoelectrochemical water splitting [9], improved photodetection performance of ZnO nanofibers decorated with Au NPs [10], or enhanced photocatalytic activity of ZnO doped with Au NPs [11]. Moreover
- milli-Q water to the freshly prepared Ag nanowire solution [55]. A higher photocatalytic activity was shown for the Ag–ZnO core–shell particles compared to ZnO alone under solar light irradiation. SERS applications of ZnO-based nanostructures SERS is a powerful technique with promising applications for
- promising optoelectronic device applications [84][85]. Being a wide-bandgap n-type semiconductor, ZnO can give a strong UV emission even at room temperature. Thus, it presents high photocatalytic activity and the potential to use it for UV light emitters. Apart from UV emission, the photoluminescence (PL
Engineered titania nanomaterials in advanced clinical applications
Beilstein J. Nanotechnol. 2022, 13, 201–218, doi:10.3762/bjnano.13.15
- systems for theranostic purposes. Titanium dioxide (titanium(IV) oxide/titania/TiO2) has garnered considerable attention as one of the most extensively studied metal oxides in clinical applications. Owing to the unique properties of titania, such as photocatalytic activity, excellent biocompatibility
- photocatalytic activity. Upon UV irradiation, the electrons in the valence band get excited to the conduction band, leading to the formation of electron–hole pairs and the generation of ROS. Subsequently, the generated holes (h+) convert water/hydroxide molecules to peroxide/hydroxyl radicals by oxidation. The
- considered as a valuable antimicrobial agent due to its photocatalytic activity and self-cleaning properties. Several factors might affect the physicochemical properties of TiO2 nps. Crystal structure and shape are the most critical factors responsible for their antimicrobial property [76]. TiO2 has
A comprehensive review on electrospun nanohybrid membranes for wastewater treatment
Beilstein J. Nanotechnol. 2022, 13, 137–159, doi:10.3762/bjnano.13.10
Tin dioxide nanomaterial-based photocatalysts for nitrogen oxide oxidation: a review
Beilstein J. Nanotechnol. 2022, 13, 96–113, doi:10.3762/bjnano.13.7
- the decomposition of gas pollutants are still being developed. In addition, previous studies have shown that the photocatalytic activity regarding NOx decomposition of SnO2 and other materials depends on many factors, such as physical structure and band energies, surface and defect states, and
- reflectance spectroscopy (DRS) [35][36][37][38][39][40]. This promotes a new avenue for diverse analyses of semiconductor photocatalysts in addition to the traditional theories and conclusions. Previous studies have shown that the photocatalytic activity of NOx decomposition of materials in general and SnO2
- quantum dots (SQDs) were heated from 200 to 700 °C, which indicated that the bandgap of the SQDs decreased from 3.49 to 2.52 eV (for SQD-700) as shown in Figure 3. These results demonstrated that the redshift is favorable for a photocatalytic activity in the visible light region. Meanwhile, Fan et al. [47
Recent progress in magnetic applications for micro- and nanorobots
Beilstein J. Nanotechnol. 2021, 12, 744–755, doi:10.3762/bjnano.12.58
- to the human body or the environment caused by other materials such as lead. In addition, Gopal et al. [48] pointed out that boron exhibits diamagnetic properties in B-doped anatase TiO2 nanoparticles and showed photocatalytic activity in the visible-light range. Magnetic MNRs were applied to the
Nanoporous and nonporous conjugated donor–acceptor polymer semiconductors for photocatalytic hydrogen production
Beilstein J. Nanotechnol. 2021, 12, 607–623, doi:10.3762/bjnano.12.50
- functional groups and geometries of the polymer framework, the influence of different factors on the photocatalytic activity can be systematically investigated and, consequently, the structure–performance relationships are unveiled. Herein, the donor and acceptor fragments in the polymer structures are
- bandgaps of the CTFs can be easily tuned to optimize the photocatalytic activity by introducing different functional groups. Besides using a single kind of electron acceptor, researchers also attempted to incorporate multiple electron acceptors to construct CPs for PHP. For instance, Thomas et al. [48
- significantly modulate the properties and photocatalytic activities of CTFs. Pyridine-based conjugated polymers Pyridine, as a nitrogen-containing benzene analogue, was incorporated into linear conjugated polymers as early as in the 1990s. The CPs exhibited distinctive photocatalytic activity for H2 production
Boosting of photocatalytic hydrogen evolution via chlorine doping of polymeric carbon nitride
Beilstein J. Nanotechnol. 2021, 12, 473–484, doi:10.3762/bjnano.12.38
- , Poland 10.3762/bjnano.12.38 Abstract Chlorine is found to be a suitable element for the modification of polymeric carbon nitride properties towards an efficient visible-light photocatalytic activity. In this study, chlorine-doped polymeric carbon nitride (Cl-PCN) has been examined as a photocatalyst in
- photocatalytic activity [15][16][17]. Furthermore, it exhibits high thermal and chemical stability during photocatalytic reactions in the aqueous phase [18]. Unfortunately, its catalytic performance is mainly constrained by several typical challenges, which are the low density of reactive sites, nonresponse in
- the long-wavelength region, sluggish kinetics, and high recombination of photoexcited electron–hole pairs [19][20][21]. Tremendous efforts have been made in order to increase the photocatalytic activity of PCN materials by optimizing their nanostructure and improving their chemical surface texture
Unravelling the interfacial interaction in mesoporous SiO2@nickel phyllosilicate/TiO2 core–shell nanostructures for photocatalytic activity
Beilstein J. Nanotechnol. 2020, 11, 1834–1846, doi:10.3762/bjnano.11.165
- , the electron–hole recombination can be inhibited by loading metals, such as Ni [12], V, Fe [13], Ag [14], and Cu–Ni [15], on the TiO2 surface, which accelerates the formation of hydroxyl radicals and, consequently, improves the photocatalytic activity of TiO2. In contrast, the doping of TiO2 with
- factor that affects the photocatalytic activity of TiO2, is its adsorption capacity for dye molecules. The adsorption capacity of TiO2 can be readily improved by modifying its surface charge density or by increasing its surface area and pore volume [5][20][21]. Further, SiO2 is a good adsorptive material
- that facilitates easy adsorption of organic molecules and their transfer onto the active sites of TiO2 [22][23]. Additionally, the interaction between SiO2 and TiO2 could result in the creation of oxygen vacancies that promote charge-transfer processes and, hence, enhance the photocatalytic activity
Nanocasting synthesis of BiFeO3 nanoparticles with enhanced visible-light photocatalytic activity
Beilstein J. Nanotechnol. 2020, 11, 1822–1833, doi:10.3762/bjnano.11.164
- applications has been limited due to their relatively large bandgaps along with their susceptibility to the fast recombination of photogenerated electron–hole pairs, leading to inefficient photocatalytic activity under visible-light or solar irradiation [14][15][16][17][18]. Thus, the development of
- photocatalytic activity [20]. Since the photocatalytic degradation of organic molecules using a metal oxide photocatalyst is a heterogeneous process, it is obvious that efficiency and overall catalytic performance are strongly correlated to the number of active sites on the catalyst surface area and, thus, to
- experiments The photocatalytic activity of the samples was evaluated regarding the degradation of RhB in water at room temperature under visible light using high-power LEDs with an emission wavelength of λ > 420 nm as a light source. In a typical experiment, 50 mL of dye solution (concentration of rhodamine B
Cu2O nanoparticles for the degradation of methyl parathion
Beilstein J. Nanotechnol. 2020, 11, 1546–1555, doi:10.3762/bjnano.11.137
- bacteria are used for the degradation of MP, whereas photocatalytic degradation needs photons in the form of UV light and chemical degradation utilizes chemical species, such as copper(I) oxide (Cu2O) NPs in this work. Cu2O is widely known for its photocatalytic activity [29][30][31][32][33]. However
Antimicrobial metal-based nanoparticles: a review on their synthesis, types and antimicrobial action
Beilstein J. Nanotechnol. 2020, 11, 1450–1469, doi:10.3762/bjnano.11.129
- microorganisms [151]. Superoxide radicals (O2−), hydroxyl radicals (•OH), hydrogen peroxide (H2O2), and singlet oxygen (1O2) are the most well-known ROS. The mechanism that better explains the synthesis of ROS from NPs is based on their photocatalytic activity (Figure 5). Metal compounds receive enough energy
Effect of Ag loading position on the photocatalytic performance of TiO2 nanocolumn arrays
Beilstein J. Nanotechnol. 2020, 11, 717–728, doi:10.3762/bjnano.11.59
- ], and combination with metal elements or other metal oxides [10]. Compared with the bulk material, one-dimensional (1D) nanostructured TiO2 presents enhanced photocatalytic activity that depends on a variety of factors such as surface area, particle shape, crystalline structure, crystal size, and
- spectra and (c,d) bandgaps of the different samples. Photocatalytic activity for the degradation of MB: (a) UV–vis absorption spectra for the photocatalytic degradation of MB in the presence of AFT1 sample, (b) photocatalytic degradation rate of MB by different samples and pure MB under UV–vis light, (c
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