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Luan J, Niu B, Ma B, Yang G, Liu W. Preparation and Property Characterization of In 2YSbO 7/BiSnSbO 6 Heterojunction Photocatalyst toward Photocatalytic Degradation of Indigo Carmine within Dye Wastewater under Visible-Light Irradiation. MATERIALS (BASEL, SWITZERLAND) 2022; 15:6648. [PMID: 36233988 PMCID: PMC9571768 DOI: 10.3390/ma15196648] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/25/2022] [Revised: 09/07/2022] [Accepted: 09/20/2022] [Indexed: 06/16/2023]
Abstract
In2YSbO7 and In2YSbO7/BiSnSbO6 heterojunction photocatalyst were prepared by a solvothermal method for the first time. The structural characteristics of In2YSbO7 had been represented. The outcomes showed that In2YSbO7 crystallized well and possessed pyrochlore constitution, a stable cubic crystal system and space group Fd3m. The lattice parameter of In2YSbO7 was discovered to be a = 11.102698 Å and the band gap energy of In2YSbO7 was discovered to be 2.68 eV, separately. After visible-light irradiation of 120 minutes (VLGI-120M), the removal rate (ROR) of indigo carmine (IC) reached 99.42% with In2YSbO7/BiSnSbO6 heterojunction (IBH) as a photocatalyst. The ROR of total organic carbon (TOC) reached 93.10% with IBH as a photocatalyst after VLGI-120M. Additionally, the dynamics constant k which was taken from the dynamic curve toward (DCT) IC density and VLGI time with IBH as a catalyst reached 0.02950 min-1. The dynamics constant k which came from the DCT TOC density and VLGI time with IBH as a photocatalyst reached 0.01783 min-1. The photocatalytic degradation of IC in dye wastewater (DW) with IBH as a photocatalyst under VLGI was in accordance with the first-order kinetic curves. IBH was used to degrade IC in DW for three cycles of experiments under VLGI, and the ROR of IC reached 98.74%, 96.89% and 94.88%, respectively, after VLGI-120M, indicating that IBH had high stability. Compared with superoxide anions or holes, hydroxyl radicals possessed the largest oxidative ability for removing IC in DW, as demonstrated by experiments with the addition of trapping agents. Lastly, the probable degradation mechanism and degradation pathway of IC were revealed in detail. The results showed that a visible-light-responsive heterojunction photocatalyst which possessed high catalytic activity and a photocatalytic reaction system which could effectively remove IC in DW were obtained. This work provided a fresh scientific research idea for improving the performance of a single catalyst.
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Affiliation(s)
- Jingfei Luan
- School of Physics, Changchun Normal University, Changchun 130032, China
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210093, China
| | - Bowen Niu
- School of Physics, Changchun Normal University, Changchun 130032, China
| | - Bingbing Ma
- School of Physics, Changchun Normal University, Changchun 130032, China
| | - Guangmin Yang
- School of Physics, Changchun Normal University, Changchun 130032, China
| | - Wenlu Liu
- School of Physics, Changchun Normal University, Changchun 130032, China
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Pascariu P, Cojocaru C, Homocianu M, Samoila P. Tuning of Sm 3+ and Er 3+-doped TiO 2 nanofibers for enhancement of the photocatalytic performance: Optimization of the photodegradation conditions. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2022; 316:115317. [PMID: 35658261 DOI: 10.1016/j.jenvman.2022.115317] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/28/2022] [Revised: 04/11/2022] [Accepted: 05/12/2022] [Indexed: 06/15/2023]
Abstract
Titanium dioxide (TiO2)-based nanofibers doped with samarium (Sm3+) and erbium (Er3+) at doping levels tuned in the range of 0.05-1.0% were prepared by the electrospinning-calcination method. The produced materials were well characterized by X-ray diffraction, SEM, EDX, and UV-vis diffuse reflectance spectroscopy. These one-dimensional nanostructures showed a crystalline structure with values of fiber diameters values between 60 and 100 nm. The best catalyst sample of this study was formulated as TiO2:Sm (0.1%) and sintered at 600 °C. And, it was employed to intensify the photocatalytic process under visible-light irradiation. Likewise, the chemometric approach was applied to optimize the process. The results revealed that the rate constant for the photo-degradation of a cationic organic pollutant was significantly improved (k = 3.496 × 10-1 min-1). In terms of the reaction half-life, the intensification and optimization of the process led to a decrease in the half-life of the reaction from 68 to 2 min. And, these are outstanding findings for the photo-degradation process under visible-light irradiation. In addition, the total organic carbon (TOC) removal efficiencies were found to be 69.95% and 72.30% for the mineralization of MB and CIP, respectively, after a 360 min reaction time, which are significant results. Moreover, this material demonstrated remarkable photocatalytic activity for the degradation of ciprofloxacin (CIP) with a 99.6% removal efficiency and a rate constant of 4.292 × 10-1 min-1. Finally, the stability and reusability of this catalyst were demonstrated during five repetitive cycles of the CIP photodegradation.
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Affiliation(s)
- Petronela Pascariu
- "Petru Poni" Institute of Macromolecular Chemistry, 41A Grigore Ghica Voda Alley, 700487, Iasi, Romania.
| | - Corneliu Cojocaru
- "Petru Poni" Institute of Macromolecular Chemistry, 41A Grigore Ghica Voda Alley, 700487, Iasi, Romania.
| | - Mihaela Homocianu
- "Petru Poni" Institute of Macromolecular Chemistry, 41A Grigore Ghica Voda Alley, 700487, Iasi, Romania
| | - Petrisor Samoila
- "Petru Poni" Institute of Macromolecular Chemistry, 41A Grigore Ghica Voda Alley, 700487, Iasi, Romania
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Preparation, Property Characterization of Gd2YSbO7/ZnBiNbO5 Heterojunction Photocatalyst for Photocatalytic Degradation of Benzotriazole under Visible Light Irradiation. Catalysts 2022. [DOI: 10.3390/catal12020159] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/10/2022] Open
Abstract
The Gd2YSbO7/ZnBiNbO5 heterojunction photocatalyst was synthesized for the first time by the facile in situ precipitation method. The structural properties of a Gd2YSbO7/ZnBiNbO5 heterojunction photocatalyst were characterized by X-ray diffractometer, scanning electron microscope-X ray energy dispersive spectra, X-ray photoelectron spectrograph and UV-Vis diffuse reflectance spectrophotometer. The band gap energy (BGE) of Gd2YSbO7 or ZnBiNbO5 was found to be 2.396 eV or 2.696 eV, respectively. The photocatalytic property of Gd2YSbO7 or ZnBiNbO5 or Gd2YSbO7/ZnBiNbO5 heterojunction photocatalyst (GZHP) was reported. After a visible-light irradiation of 145 minutes (VLI-145 min), the removal rate (RER) of benzotriazole reached 99.05%, 82.45%, 78.23% or 47.30% with Gd2YSbO7/ZnBiNbO5 heterojunction (GZH), Gd2YSbO7, ZnBiNbO5 or N-doped TiO2 (NTO) as photocatalyst. In addition, the kinetic constant k, derived from the dynamic curve toward benzotriazole concentration and visible light irradiation time with GZH as a photocatalyst, reached 0.0213 min−1. Compared with Gd2YSbO7 or ZnBiNbO5 or NTO, GZHP showed maximal photocatalytic activity (PHA) for the photocatalytic degradation of benzotriazole under visible-light irradiation. The RER of total organic carbon during the photocatalytic degradation of benzotriazole reached 90.18%, 74.35%, 70.73% or 42.15% with GZH as a photocatalyst or with Gd2YSbO7, ZnBiNbO5 or NTO as a photocatalyst after VLI-145 min. Moreover, the kinetic constant k, which came from the dynamic curve toward total organic carbon concentration and visible light irradiation time with GZH as a photocatalyst, reached 0.0110 min−1. Based on above results, GZHP showed the maximal mineralization percentage ratio when GZHP degraded benzotriazole. The results showed that hydroxyl radicals was the main oxidation radical during the degradation of benzotriazole. The photocatalytic degradation of benzotriazole with GZH as a photocatalyst conformed to the first-order reaction kinetics. Our research aimed to improve the photocatalytic properties of the single photocatalyst.
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Synthesis, Property Characterization and Photocatalytic Activity of the Ag3PO4/Gd2BiTaO7 Heterojunction Catalyst under Visible Light Irradiation. Catalysts 2021. [DOI: 10.3390/catal12010022] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
A new type of Gd2BiTaO7 nanocatalyst (GBT) was synthesized by a high-temperature solid-phase method, and a heterojunction photocatalyst, which was composed of GBT and silver phosphate (AP), was prepared by the facile in-situ precipitation method for the first time. The photocatalytic property of GBT or the Ag3PO4/Gd2BiTaO7 heterojunction photocatalyst (AGHP) was reported. The structural properties of GBT and AGHP were characterized by an X-ray diffractometer, scanning electron microscope–X-ray energy dispersive spectra, an X-ray photoelectron spectrograph, a synchrotron-based ultraviolet photoelectron spectroscope, a Fourier transform infrared spectrometer, an UV-Vis diffuse reflectance spectrophotometer and an electron paramagnetic resonance spectrometer. The results displayed that GBT was well crystallized with a stable cubic crystal system and space group Fd3m. The lattice parameter or band gap energy of GBT was found to be a = 10.740051 Å or 2.35 eV, respectively. After visible light irradiation of 30 min, the removal rate of bisphenol A (BPA) reached 99.52%, 95.53% or 37.00% with AGHP as the photocatalyst, with Ag3PO4 and potassium persulfate (AP-PS) as photocatalysts or with N-doped TiO2 (NT) as a photocatalyst, respectively. According to the experimental data, it could be found that the removal rate of BPA with AGHP as a photocatalyst was 2.69 times higher than that with NT as a photocatalyst. AGHP showed higher photocatalytic activity for photocatalytic degradation of BPA under visible light irradiation compared with GBT or AP-PS or NT. The removal rate of total organic carbon (TOC) was 96.21%, 88.10% or 30.55% with AGHP as a photocatalyst, with AP-PS as photocatalysts or with NT as a photocatalyst after visible light irradiation of 30 min. The above results indicated that AGHP possessed the maximal mineralization percentage ratio during the process of degrading BPA compared with GBT or AP-PS or NT. The results indicated that the main oxidation radical was •OH during the process of degrading BPA. The photocatalytic degradation of BPA with AGHP as a photocatalyst conformed to the first-order reaction kinetics. This study provided inspiration for obtaining visible light-responsive heterojunction photocatalysts with high catalytic activity and efficient removal technologies for organic pollutants and toxic pollutants, and as a result, the potential practical applications of visible light-responsive heterojunction photocatalysts were widened. The subsequent research of thin-film plating of the heterojunction catalysts and the construction of complete photoluminescent thin-film catalytic reaction systems, which utilized visible light irradiation, could provide new technologies and perspectives for the pharmaceutical wastewater treatment industry.
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Photocatalytic Activity of Nanocoatings Based on Mixed Oxide V-TiO2 Nanoparticles with Controlled Composition and Size. Catalysts 2021. [DOI: 10.3390/catal11121457] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
V-TiO2 photocatalyst with 0 ≤ V ≤ 20 mol% was prepared via the sol–gel method based on mixed oxide titanium–vanadium nanoparticles with size and composition control. The mixed oxide vanadium–titanium oxo-alkoxy nanonoparticles were generated in a chemical micromixing reactor, coated on glass beads via liquid colloid deposition method and underwent to an appropriate thermal treatment forming crystallized nanocoatings. X-ray diffraction, Raman, thermogravimetric and differential thermal analyses confirmed anatase crystalline structure at vanadium content ≤ 10 mol%, with the cell parameters identical to those of pure TiO2. At a higher vanadium content of ~20 mol%, the material segregation began and orthorhombic phase of V2O5 appeared. The crystallization onset temperature of V-TiO2 smoothly changed with an increase in vanadium content. The best photocatalytic performance towards methylene blue decomposition in aqueous solutions under UVA and visible light illuminations was observed in V-TiO2 nanocoatings with, respectively, 2 mol% and 10 mol% vanadium.
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Electrospun-based TiO2 nanofibers for organic pollutant photodegradation: a comprehensive review. REV CHEM ENG 2021. [DOI: 10.1515/revce-2020-0022] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
Abstract
Titanium dioxide (TiO2) is commonly used as a photocatalyst in the removal of organic pollutants. However, weaknesses of TiO2 such as fast charge recombination and low visible light usage limit its industrial application. Furthermore, photocatalysts that are lost during the treatment of pollutants create the problem of secondary pollutants. Electrospun-based TiO2 fiber is a promising alternative to immobilize TiO2 and to improve its performance in photodegradation. Some strategies have been employed in fabricating the photocatalytic fibers by producing hollow fibers, porous fibers, composite TiO2 with magnetic materials, graphene oxide, as well as doping TiO2 with metal. The modification of TiO2 can improve the absorption of TiO2 to the visible light area, act as an electron acceptor, provide large surface area, and promote the phase transformation of TiO2. The improvement of TiO2 properties can enhance carrier transfer rate which reduces the recombination and promotes the generation of radicals that potentially degrade organic pollutants. The recyclability of fibers, calcination effect, photocatalytic reactors used, operation parameters involved in photodegradation as well as the commercialization potential of TiO2 fibers are also discussed in this review.
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Zhang P, Zhang S, Wan D, Zhang P, Zhang Z, Shao G. Multilevel polarization-fields enhanced capture and photocatalytic conversion of particulate matter over flexible schottky-junction nanofiber membranes. JOURNAL OF HAZARDOUS MATERIALS 2020; 395:122639. [PMID: 32305717 DOI: 10.1016/j.jhazmat.2020.122639] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/09/2020] [Revised: 04/01/2020] [Accepted: 04/02/2020] [Indexed: 06/11/2023]
Abstract
Atmospheric Particulate matter (PM) with small sizes has caused a serious air-pollution problem calling for high-performance PM-capture materials and promising remediation strategies. In this contribution, we propose a new idea to proactively capture PM and simultaneously in-situ convert the captured PM pollution over the flexible schottky-junctions nanofiber membrane (NFM) consisting of rutile TiO2 nanoparticles (NPs)-decorated electrospun carbon NFs. We also demonstrate that both the interfacial electron-transfer process at the TiO2/carbon schottky-junctions and the photo-excitation process at the surface of TiO2 NPs can induce polarization fields in the TiO2/carbon NFM due to the difference of the space-charge distribution. These multilevel polarization fields can drive the long-range electrostatic force to enhance the proactive PM-capture ability of the NFM. As such, the TiO2/carbon NFM exhibited a satisfactory quality factor (0.11 Pa-1) for balancing the PM2.5-filtration efficiency (99.92 %) and the pressure drop (only 63 Pa). More importantly, upon UV-vis-light irradiation, 92.98 % of the ultrafine PM0.3 was removed over this TiO2/carbon NFM. Furthermore, the as-captured PM on the NFM could be photocatalytically decomposed by the photoactive-component of TiO2 NPs, during which some of the carbonaceous PM was converted into the fuels of such CO and CH4 through a multi-step photoreaction.
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Affiliation(s)
- Peng Zhang
- School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450001, PR China; State Centre for International Cooperation on Designer Low-Carbon & Environmental Materials (CDLCEM), Zhengzhou University, Zhengzhou 450001, PR China; Zhengzhou Materials Genome Institute, Xingyang 450100, PR China.
| | - Shijie Zhang
- School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450001, PR China; State Centre for International Cooperation on Designer Low-Carbon & Environmental Materials (CDLCEM), Zhengzhou University, Zhengzhou 450001, PR China
| | - Dongyang Wan
- School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450001, PR China; State Centre for International Cooperation on Designer Low-Carbon & Environmental Materials (CDLCEM), Zhengzhou University, Zhengzhou 450001, PR China
| | - Pengpeng Zhang
- School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450001, PR China; State Centre for International Cooperation on Designer Low-Carbon & Environmental Materials (CDLCEM), Zhengzhou University, Zhengzhou 450001, PR China
| | - Zhenyi Zhang
- School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450001, PR China; State Centre for International Cooperation on Designer Low-Carbon & Environmental Materials (CDLCEM), Zhengzhou University, Zhengzhou 450001, PR China; Zhengzhou Materials Genome Institute, Xingyang 450100, PR China; Key Laboratory of New Energy and Rare Earth Resource Utilization of State Ethnic Affairs Commission, Key Laboratory of Photosensitive Materials and Devices of Liaoning Province, School of Physics and Materials Engineering, Dalian Minzu University, 18 Liaohe West Road, Dalian 116600, PR China.
| | - Guosheng Shao
- School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450001, PR China; State Centre for International Cooperation on Designer Low-Carbon & Environmental Materials (CDLCEM), Zhengzhou University, Zhengzhou 450001, PR China; Zhengzhou Materials Genome Institute, Xingyang 450100, PR China.
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Graphene Quantum Dots Doped PVDF(TBT)/PVP(TBT) Fiber Film with Enhanced Photocatalytic Performance. APPLIED SCIENCES-BASEL 2020. [DOI: 10.3390/app10020596] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
We report the fabrication of polyvinylidene fluoride (tetrabutyl titanate)/polyvinyl pyrrolidone ((tetrabutyl titanate))-graphene quantum dots [PVDF(TBT)/PVP(TBT)-GQDs] film photocatalyst with enhanced photocatalytic performance. The polyvinylidene fluoride (tetrabutyl titanate)/polyvinyl pyrrolidone ((tetrabutyl titanate)) [PVDF(TBT)/PVP(TBT)] film was first prepared with a dual-electrospinning method and then followed by attaching graphene quantum dots (GQDs) to the surface of the composite film through a hydrothermal method. Later, part of the PVP in the composite film was dissolved by a hydrothermal method. As a result, a PVDF(TBT)/PVP(TBT)-GQDs film photocatalyst with a larger specific surface area was achieved. The photocatalytic degradation behavior of the PVDF(TBT)/PVP(TBT)-GQDs film photocatalyst was examined by using Rhodamine B as the target contaminant. The PVDF(TBT)/PVP(TBT)-GQDs photocatalyst showed a higher photocatalytic efficiency than PVDF(TBT)-H2O, PVDF(TBT)/PVP(TBT)-H2O, and PVDF(TBT)-GQDs, respectively. The enhanced photocatalytic efficiency can be attributed to the broader optical response range of the PVDF(TBT)/PVP(TBT)-GQDs photocatalyst, which makes it useful as an effective photocatalyst under white light irradiation.
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EPR Evidence for Dynamic Rearrangements of Vanadium Paramagnetic Centers on the Surface of V-Doped Titanium Dioxide. Catal Letters 2019. [DOI: 10.1007/s10562-019-02946-w] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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10
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El Mragui A, Zegaoui O, Daou I. Synthesis, characterization and photocatalytic properties under visible light of doped and co-doped TiO2-based nanoparticles. ACTA ACUST UNITED AC 2019. [DOI: 10.1016/j.matpr.2019.04.049] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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11
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Enhanced photocatalytic activity of TiO2/graphene by tailoring oxidation degrees of graphene oxide for gaseous mercury removal. KOREAN J CHEM ENG 2018. [DOI: 10.1007/s11814-018-0148-z] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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12
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Pahasup-Anan T, Suwannahong K, Dechapanya W, Rangkupan R. Fabrication and photocatalytic activity of TiO 2 composite membranes via simultaneous electrospinning and electrospraying process. J Environ Sci (China) 2018; 72:13-24. [PMID: 30244739 DOI: 10.1016/j.jes.2017.11.025] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2017] [Revised: 11/06/2017] [Accepted: 11/24/2017] [Indexed: 06/08/2023]
Abstract
In present study, a simultaneous electrospinning and electrospraying (SEE) process was employed to produce microclusters of TiO2 nanoparticles and interlock them in nanofibrous network. The photocatalytic composite membranes (PCMs) were fabricated by electrospraying TiO2 nanoparticle suspension into microcluster form that dispersed and entrapped within nylon-6 electrospun fiber membrane. Three PCMs membrane with TiO2 content of 52.0, 83.6, and 91.7wt.% were successfully fabricated. The membrane consisted of TiO2 microclusters, ranging in sizes from around 0.3 to 10μm, distributed uniformly within the nylon-6 nanofibrous network. PCMs photocatalytic activity against Methylene Blue (MB) in aqueous solution showed more than 98% MB removal efficiency after 120min of photocatalytic oxidation (PCO) for all PCMs. For PCM with the highest TiO2 content tested for 5 PCO cycles, it was found that most of their TiO2 content remained incorporated within the nanofibrous structure. The concept of nanoparticles clusters entrapment with SEE fabrication employed here provide a simple and effective method for reducing detachment of nanostructure phase from nanocomposite membrane.
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Affiliation(s)
- Taddao Pahasup-Anan
- International Program in Hazardous Substance and Environmental Management, Graduate School, Chulalongkorn University, Bangkok 10330, Thailand; Center of Excellence on Hazardous Substance Management (HSM), Bangkok 10330, Thailand
| | - Kowit Suwannahong
- Department of Public Health, Faculty of Public Health, Western University, Kanchanaburi 71170, Thailand
| | - Wipada Dechapanya
- International Program in Hazardous Substance and Environmental Management, Graduate School, Chulalongkorn University, Bangkok 10330, Thailand; Department of Chemical Engineering, Faculty of Engineering, Ubonratchathani University, Ubonratchathani 34190, Thailand.
| | - Ratthapol Rangkupan
- Metallurgy and Materials Science Research Institute, Chulalongkorn University, Bangkok 10330, Thailand; Nanotec-CU Center of Excellence on Food and Agriculture, Chulalongkorn University, Bangkok 10330, Thailand.
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Naeem R, Ehsan MA, Rehman A, Yamani ZH, Hakeem AS, Mazhar M. Single step aerosol assisted chemical vapor deposition of p–n Sn(ii) oxide–Ti(iv) oxide nanocomposite thin film electrodes for investigation of photoelectrochemical properties. NEW J CHEM 2018. [DOI: 10.1039/c7nj04606e] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Novel p–n SnO–TiO2 nanocomposite film electrodes were fabricated through a single step method and their photoelectrocatalytic properties were evaluated.
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Affiliation(s)
- Rabia Naeem
- Department of Chemistry
- Faculty of Science
- University of Malaya
- Lembah Pantai
- Malaysia
| | - Muhammad Ali Ehsan
- Center of Research Excellence in Nanotechnology (CENT)
- King Fahd University of Petroleum & Minerals
- Dhahran 31261
- Saudi Arabia
| | - Abdul Rehman
- Department of Chemistry
- King Fahd University of Petroleum & Minerals
- Dhahran 31261
- Saudi Arabia
| | - Zain Hassan Yamani
- Center of Research Excellence in Nanotechnology (CENT)
- King Fahd University of Petroleum & Minerals
- Dhahran 31261
- Saudi Arabia
| | - Abbas Saeed Hakeem
- Center of Research Excellence in Nanotechnology (CENT)
- King Fahd University of Petroleum & Minerals
- Dhahran 31261
- Saudi Arabia
| | - Muhammad Mazhar
- Department of Environmental Sciences
- Fatima Jinnah Women University, the Mall
- Rawalpindi
- Pakistan
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A new bismuth vanadate-type semiconductor Bi 12 V 2 O 23 with visible light-driven photocatalytic activity. J Taiwan Inst Chem Eng 2017. [DOI: 10.1016/j.jtice.2017.09.042] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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15
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Singh N, Prakash J, Misra M, Sharma A, Gupta RK. Dual Functional Ta-Doped Electrospun TiO 2 Nanofibers with Enhanced Photocatalysis and SERS Detection for Organic Compounds. ACS APPLIED MATERIALS & INTERFACES 2017; 9:28495-28507. [PMID: 28776975 DOI: 10.1021/acsami.7b07571] [Citation(s) in RCA: 63] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
There is a growing interest in multifunctional nanomaterials for the detection as well as degradation of organic contaminants in the water. In this work, we report on the development of dual functional TiO2 nanofibers (TNF) with different tantalum (Ta) doping (1-10 mol %) by a simple electrospinning technique. As-prepared TNF show mesoporous dominant structure, which are favorable for photocatalytic activity due to the presence of catalytic spots. Ta doping decreases the crystalline size within TiO2 matrix because of the incorporation of Ta5+ ions and restricts the phase transformation from anatase to rutile. Ta doping slightly enhances the visible light absorption because of the Ti3+ defects sites created upon Ta5+ doping. The effect of Ta doping within TiO2 matrix was systematically studied for the degradation of methylene blue (MB) dye under ultraviolet (UV) and solar light irradiation. The 5% Ta-doped TNF were found to be optimal and showed 5.1 and 2.2 times higher photocatalytic activity as compared to TNF under UV and solar light irradiation, respectively. The effect of Ta doping for the detection of MB molecules was also studied by surface enhanced Raman scattering (SERS). It was observed that 5% Ta-doped TNF exhibit higher photocatalytic activity and enhanced SERS signals of adsorbed MB molecules as compared to the TNF. The enhanced photocatalytic and SERS activities can be explained as combined effects of enhanced visible light absorption, lower crystalline size, and slightly higher surface area. The observed results show that Ta doping induces new energy levels below the conduction band of TiO2 because of Ti3+ defects, which inhibit the photogenerated charge recombination acting as electron traps and promote charge transfer mechanism acting as an intermediate state for TiO2 to MB molecule electron transfer, and are mainly responsible for the enhanced photocatalytic and SERS activities, respectively.
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Affiliation(s)
| | - Jai Prakash
- Department of Physics, University of the Free State , Bloemfontein 9300, South Africa
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Advances in Photocatalytic CO₂ Reduction with Water: A Review. MATERIALS 2017; 10:ma10060629. [PMID: 28772988 PMCID: PMC5553537 DOI: 10.3390/ma10060629] [Citation(s) in RCA: 76] [Impact Index Per Article: 10.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/15/2017] [Revised: 04/04/2017] [Accepted: 05/23/2017] [Indexed: 12/20/2022]
Abstract
In recent years, the increasing level of CO₂ in the atmosphere has not only contributed to global warming but has also triggered considerable interest in photocatalytic reduction of CO₂. The reduction of CO₂ with H₂O using sunlight is an innovative way to solve the current growing environmental challenges. This paper reviews the basic principles of photocatalysis and photocatalytic CO₂ reduction, discusses the measures of the photocatalytic efficiency and summarizes current advances in the exploration of this technology using different types of semiconductor photocatalysts, such as TiO₂ and modified TiO₂, layered-perovskite Ag/ALa₄Ti₄O15 (A = Ca, Ba, Sr), ferroelectric LiNbO₃, and plasmonic photocatalysts. Visible light harvesting, novel plasmonic photocatalysts offer potential solutions for some of the main drawbacks in this reduction process. Effective plasmonic photocatalysts that have shown reduction activities towards CO₂ with H₂O are highlighted here. Although this technology is still at an embryonic stage, further studies with standard theoretical and comprehensive format are suggested to develop photocatalysts with high production rates and selectivity. Based on the collected results, the immense prospects and opportunities that exist in this technique are also reviewed here.
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Wang B, de Godoi FC, Zheng S, Gentle IR, Li C. Enhanced photocatalytic properties of reusable TiO 2 -loaded natural porous minerals in dye wastewater purification. POWDER TECHNOL 2016. [DOI: 10.1016/j.powtec.2016.09.003] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Li T, Zhang Z, Li W, Liu C, Wang J, An L. H 4 SiW 12 O 40 /polymethylmethacrylate/polyvinyl alcohol sandwich nanofibrous membrane with enhanced photocatalytic activity. Colloids Surf A Physicochem Eng Asp 2016. [DOI: 10.1016/j.colsurfa.2015.10.061] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Cai Y, Ye Y, Wu S, Liu J, Liang C. Simultaneous Cu doping and growth of TiO2 nanocrystalline array film as a glucose biosensor. RSC Adv 2016. [DOI: 10.1039/c6ra15014d] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
Copper ion doping and growth of a TiO2 nanocrystalline material can be realized by using colloidal nanoparticles as a reactive precursor. Such an efficient doping design facilitates the use of TiO2 as a potential biosensor for glucose molecules.
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Affiliation(s)
- Yunyu Cai
- Key Laboratory of Materials Physics and Anhui Key Laboratory of Nanomaterials and Nanotechnology
- Institute of Solid State Physics
- Chinese Academy of Sciences
- Hefei 230031
- China
| | - Yixing Ye
- Key Laboratory of Materials Physics and Anhui Key Laboratory of Nanomaterials and Nanotechnology
- Institute of Solid State Physics
- Chinese Academy of Sciences
- Hefei 230031
- China
| | - Shouliang Wu
- Key Laboratory of Materials Physics and Anhui Key Laboratory of Nanomaterials and Nanotechnology
- Institute of Solid State Physics
- Chinese Academy of Sciences
- Hefei 230031
- China
| | - Jun Liu
- Key Laboratory of Materials Physics and Anhui Key Laboratory of Nanomaterials and Nanotechnology
- Institute of Solid State Physics
- Chinese Academy of Sciences
- Hefei 230031
- China
| | - Changhao Liang
- Key Laboratory of Materials Physics and Anhui Key Laboratory of Nanomaterials and Nanotechnology
- Institute of Solid State Physics
- Chinese Academy of Sciences
- Hefei 230031
- China
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Baklanova I, Krasil’nikov V, Zhukov V, Gyrdasova O, Kuznetsov M, Buldakova L, Yanchenko M. Synthesis, spectral, optical and photocatalytic properties of vanadium- and carbon-doped titanium dioxide with three-dimensional architecture of aggregates. J Photochem Photobiol A Chem 2016. [DOI: 10.1016/j.jphotochem.2015.08.002] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Wang C, Huang Z. Synthesis and Photocatalytic Activity of One-dimensional α-Fe2O3 Nanorods. CHEM LETT 2015. [DOI: 10.1246/cl.150847] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Chao Wang
- School of Materials Science and Engineering, Wuhan University of Technology
- School of Construction and Materials Engineering, Hubei University of Education
| | - Zhixiong Huang
- School of Materials Science and Engineering, Wuhan University of Technology
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Li T, Zhang Z, Li W, Liu C, Zhou H, An L. Electrospinning preparation, characterization, and enhanced photocatalytic activity of an Silicotungstic acid (H4SiW12O40)/poly(vinyl alcohol)/poly(methyl methacrylate) composite nanofiber membrane. J Appl Polym Sci 2015. [DOI: 10.1002/app.43193] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Tingting Li
- College of Material Science and Engineering; North China University of Science and Technology, Hebei Provincial Key Laboratory of Inorganic Nonmetallic Materials; Tangshan 063009 China
| | - Zhiming Zhang
- College of Material Science and Engineering; North China University of Science and Technology, Hebei Provincial Key Laboratory of Inorganic Nonmetallic Materials; Tangshan 063009 China
| | - Wei Li
- College of Material Science and Engineering; North China University of Science and Technology, Hebei Provincial Key Laboratory of Inorganic Nonmetallic Materials; Tangshan 063009 China
| | - Ce Liu
- College of Chemical Engineering; North China University of Science and Technology; Tangshan 063009 China
| | - Haoyu Zhou
- College of Material Science and Engineering; North China University of Science and Technology, Hebei Provincial Key Laboratory of Inorganic Nonmetallic Materials; Tangshan 063009 China
| | - Libao An
- College of Mechanical Engineering; North China University of Science and Technology; Tangshan 063009 China
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Chuai H, Zhou D, Zhu X, Li Z, Huang W. Characterization of V2O5/MoO3 composite photocatalysts prepared via electrospinning and their photodegradation activity for dimethyl phthalate. CHINESE JOURNAL OF CATALYSIS 2015. [DOI: 10.1016/s1872-2067(15)61002-6] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Wang B, Zhang G, Leng X, Sun Z, Zheng S. Characterization and improved solar light activity of vanadium doped TiO2/diatomite hybrid catalysts. JOURNAL OF HAZARDOUS MATERIALS 2015; 285:212-220. [PMID: 25497036 DOI: 10.1016/j.jhazmat.2014.11.031] [Citation(s) in RCA: 60] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/12/2014] [Revised: 11/17/2014] [Accepted: 11/21/2014] [Indexed: 06/04/2023]
Abstract
V-doped TiO2/diatomite composite photocatalysts with different vanadium concentrations were synthesized by a modified sol-gel method. The diatomite was responsible for the well dispersion of TiO2 nanoparticles on the matrix and consequently inhibited the agglomeration. V-TiO2/diatomite hybrids showed red shift in TiO2 absorption edge with enhanced absorption intensity. Most importantly, the dopant energy levels were formed in the TiO2 bandgap due to V(4+) ions substituted to Ti(4+) sites. The 0.5% V-TiO2/diatomite photocatalyst displayed narrower bandgap (2.95 eV) compared to undoped sample (3.13 eV) and other doped samples (3.05 eV) with higher doping concentration. The photocatalytic activities of V doped TiO2/diatomite samples for the degradation of Rhodamine B under stimulated solar light illumination were significantly improved compared with the undoped sample. In our case, V(4+) ions incorporated in TiO2 lattice were responsible for increased visible-light absorption and electron transfer to oxygen molecules adsorbed on the surface of TiO2 to produce superoxide radicals ˙O2(-), while V(5+) species presented on the surface of TiO2 particles in the form of V2O5 contributed to e(-)-h(+) separation. In addition, due to the combination of diatomite as support, this hybrid photocatalyst could be separated from solution quickly by natural settlement and exhibited good reusability.
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Affiliation(s)
- Bin Wang
- School of Chemical and Environmental Engineering, China University of Mining & Technology, Beijing 100083, PR China; School of Chemistry and Molecular Biosciences, The University of Queensland, Brisbane, Qld 4072, Australia.
| | - Guangxin Zhang
- School of Chemical and Environmental Engineering, China University of Mining & Technology, Beijing 100083, PR China.
| | - Xue Leng
- School of Chemistry and Molecular Biosciences, The University of Queensland, Brisbane, Qld 4072, Australia.
| | - Zhiming Sun
- School of Chemical and Environmental Engineering, China University of Mining & Technology, Beijing 100083, PR China.
| | - Shuilin Zheng
- School of Chemical and Environmental Engineering, China University of Mining & Technology, Beijing 100083, PR China.
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Yu R, Xue N, Huo S, Li J, Wang J. Structure characteristics and photoactivity of simultaneous luminescence and photocatalysis in CaV2O6 nanorods synthesized by the sol–gel Pechini method. RSC Adv 2015. [DOI: 10.1039/c5ra10465c] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
CaV2O6 nanorods show simultaneous luminescent and photocatalytic activities meaning that CaV2O6 could be a potential photoactive material with a layered structure constructed by line-arranged VO5 units.
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Affiliation(s)
- Ruijin Yu
- College of Science
- Northwest A&F University
- Yangling
- PR China
- Department of Chemistry
| | - Na Xue
- College of Science
- Northwest A&F University
- Yangling
- PR China
| | - Shuaidong Huo
- Department of Chemistry
- University of Massachusetts Amherst
- Amherst
- USA
| | - Junbo Li
- Department of Chemistry
- University of Massachusetts Amherst
- Amherst
- USA
| | - Jinyi Wang
- College of Science
- Northwest A&F University
- Yangling
- PR China
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Nimkar SH, Agrawal SP, Kondawar SB. Fabrication of Electrospun Nanofibers of Titanium Dioxide Intercalated Polyaniline Nanocomposites for CO2 Gas Sensor. ACTA ACUST UNITED AC 2015. [DOI: 10.1016/j.mspro.2015.06.008] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Mondal K, Bhattacharyya S, Sharma A. Photocatalytic Degradation of Naphthalene by Electrospun Mesoporous Carbon-Doped Anatase TiO2 Nanofiber Mats. Ind Eng Chem Res 2014. [DOI: 10.1021/ie5025744] [Citation(s) in RCA: 62] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Kunal Mondal
- Department
of Chemical Engineering, Indian Institute of Technology, Kanpur, 208016, India
| | | | - Ashutosh Sharma
- Department
of Chemical Engineering, Indian Institute of Technology, Kanpur, 208016, India
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Sun D, Li J, He L, Zhao B, Wang T, Li R, Yin S, Feng Z, Sato T. Facile solvothermal synthesis of BiOCl–TiO2heterostructures with enhanced photocatalytic activity. CrystEngComm 2014. [DOI: 10.1039/c4ce00596a] [Citation(s) in RCA: 55] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Lu M, Shao C, Wang K, Lu N, Zhang X, Zhang P, Zhang M, Li X, Liu Y. p-MoO3 nanostructures/n-TiO2 nanofiber heterojunctions: controlled fabrication and enhanced photocatalytic properties. ACS APPLIED MATERIALS & INTERFACES 2014; 6:9004-12. [PMID: 24869636 DOI: 10.1021/am5021155] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
In this work, p-MoO3 nanostructures/n-TiO2 nanofiber heterojunctions (p-MoO3/n-TiO2-NF-HJs) were obtained by a two-step fabrication route. First, MoO2 nanostructures were hydrothermally grown on electrospun TiO2 nanofibers. Second, by thermal treatment of the obtained MoO2 nanostructures/TiO2 nanofibers, p-MoO3/n-TiO2-NF-HJs were obtained due to the phase transition of MoO2 to MoO3. With increasing the concentration of molybdenum precursor in hydrothermal process, the morphologies of MoO2 changed from nanoparticles to nanosheets, and then fully covered shells with an increased loading on TiO2 nanofibers. After calcination, the obtained p-MoO3/n-TiO2-NF-HJs possessed similar morphology to that without thermal treatment. X-ray photoelectron spectra showed that both Ti 2p and OTi-O 1s peaks of p-MoO3/n-TiO2-NF-HJs shifted to higher binding energies than that of TiO2 nanofibers, suggesting electron transfer from TiO2 to MoO3 in the formation of p-n nanoheterojunctions. The p-n nanoheterojunctions decreased photoluminescence intensity, suppressed photogenerated electrons and holes recombinations, and enhanced charge separation and photocatalytic efficiencies. The apparent first-order rate constant for the degradation of RB by p-MoO3/n-TiO2-NF-HJs with nanosheets surface morphology was two times that of TiO2 nanofibers. For the core/shell structure of p-MoO3/n-TiO2-NF-HJs, the internal electric field of p-n junction forced the photogenerated electrons transferring to TiO2 cores, then decreased the surface photocatalytic reactions and led to the lowest photocatalytic activity among the p-MoO3/n-TiO2-NF-HJs.
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Affiliation(s)
- Mingxing Lu
- Center for Advanced Optoelectronic Functional Materials Research, and Key Laboratory of UV Light-Emitting Materials and Technology of Ministry of Education, Northeast Normal University , 5268 Renmin Street, Changchun 130024, People's Republic of China
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Lu D, Zhang M, Zhang Z, Li Q, Wang X, Yang J. Self-organized vanadium and nitrogen co-doped titania nanotube arrays with enhanced photocatalytic reduction of CO2 into CH4. NANOSCALE RESEARCH LETTERS 2014; 9:272. [PMID: 24948893 PMCID: PMC4050103 DOI: 10.1186/1556-276x-9-272] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/26/2014] [Accepted: 05/21/2014] [Indexed: 05/30/2023]
Abstract
Self-organized V-N co-doped TiO2 nanotube arrays (TNAs) with various doping amount were synthesized by anodizing in association with hydrothermal treatment. Impacts of V-N co-doping on the morphologies, phase structures, and photoelectrochemical properties of the TNAs films were thoroughly investigated. The co-doped TiO2 photocatalysts show remarkably enhanced photocatalytic activity for the CO2 photoreduction to methane under ultraviolet illumination. The mechanism of the enhanced photocatalytic activity is discussed in detail.
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Affiliation(s)
- Dandan Lu
- Key Laboratory for Special Functional Materials of Ministry of Education, Henan University, Kaifeng 475004, People's Republic of China
| | - Min Zhang
- Key Laboratory for Special Functional Materials of Ministry of Education, Henan University, Kaifeng 475004, People's Republic of China
| | - Zhihua Zhang
- Key Laboratory for Special Functional Materials of Ministry of Education, Henan University, Kaifeng 475004, People's Republic of China
| | - Qiuye Li
- Key Laboratory for Special Functional Materials of Ministry of Education, Henan University, Kaifeng 475004, People's Republic of China
| | - Xiaodong Wang
- Key Laboratory for Special Functional Materials of Ministry of Education, Henan University, Kaifeng 475004, People's Republic of China
| | - Jianjun Yang
- Key Laboratory for Special Functional Materials of Ministry of Education, Henan University, Kaifeng 475004, People's Republic of China
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The enhancement in photocatalytic activity of bismuth modified silica and bismuth silicate nanofibers. CATAL COMMUN 2014. [DOI: 10.1016/j.catcom.2014.02.001] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
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Fabrication of CdS and CuWO4 modified TiO2 nanoparticles and its photocatalytic activity under visible light irradiation. J IND ENG CHEM 2014. [DOI: 10.1016/j.jiec.2013.04.038] [Citation(s) in RCA: 64] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Zhang Z, Shao C, Li X, Sun Y, Zhang M, Mu J, Zhang P, Guo Z, Liu Y. Hierarchical assembly of ultrathin hexagonal SnS2 nanosheets onto electrospun TiO2 nanofibers: enhanced photocatalytic activity based on photoinduced interfacial charge transfer. NANOSCALE 2013; 5:606-618. [PMID: 23202888 DOI: 10.1039/c2nr32301j] [Citation(s) in RCA: 149] [Impact Index Per Article: 13.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Well-designed hierarchical nanostructures with one dimensional (1D) TiO(2) nanofibers (120-350 nm in diameter and several micrometers in length) and ultrathin hexagonal SnS(2) nanosheets (40-70 nm in lateral size and 4-8 nm in thickness) were successfully synthesized by combining the electrospinning technique (for TiO(2) nanofibers) and a hydrothermal growth method (for SnS(2) nanosheets). The single-crystalline SnS(2) nanosheets with a 2D layered structure were uniformly grown onto the electrospun TiO(2) nanofibers consisted of either anatase (A) phase or anatase-rutile (AR) mixed phase TiO(2) nanoparticles. The definite heterojunction interface between SnS(2) nanosheets and TiO(2) (A or R) nanoparticles were investigated by high resolution transmission electron microscopy (HRTEM) and X-ray photoelectron spectroscopy (XPS). Moreover, the as-prepared SnS(2)/TiO(2) hierarchical nanostructures as nanoheterojunction photocatalysts exhibited excellent UV and visible light photocatalytic activities for the degradation of organic dyes (rhodamine B and methyl orange) and phenols (4-nitrophenol), remarkably superior to the TiO(2) nanofibers and the SnS(2) nanosheets, mainly owing to the photoinduced interfacial charge transfer based on the photosynergistic effect of the SnS(2)/TiO(2) heterojunction. Significantly, the SnS(2)/TiO(2) (AR) hierarchical nanostructures as the tricomponent heterojunction system possessed stronger photocatalytic activity than the bicomponent heterojunction system of SnS(2)/TiO(2) (A) hierarchical nanostructures or TiO(2) (AR) nanofibers, which was discussed in terms of the three-way photosynergistic effect between SnS(2), TiO(2) (A) and TiO(2) (R) component in the SnS(2)/TiO(2) (AR) heterojunction resulting in the high separation efficiency of photoinduced electron-hole pairs, as evidenced by photoluminescence (PL) and surface photovoltage spectra (SPS).
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Affiliation(s)
- Zhenyi Zhang
- Center for Advanced Optoelectronic Functional Materials Research, Key Laboratory of UV Light-Emitting Materials and Technology of Ministry of Education, Northeast Normal University, 5268 Renmin Street, Changchun 130024, People's Republic of China
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Wang W, Feng Z, Jiang W, Zhan J. Electrospun porous CuO–Ag nanofibers for quantitative sensitive SERS detection. CrystEngComm 2013. [DOI: 10.1039/c2ce26591e] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Guo Z, Chen B, Mu J, Zhang M, Zhang P, Zhang Z, Wang J, Zhang X, Sun Y, Shao C, Liu Y. Iron phthalocyanine/TiO2 nanofiber heterostructures with enhanced visible photocatalytic activity assisted with H2O2. JOURNAL OF HAZARDOUS MATERIALS 2012; 219-220:156-63. [PMID: 22503141 DOI: 10.1016/j.jhazmat.2012.03.068] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/12/2011] [Revised: 03/24/2012] [Accepted: 03/26/2012] [Indexed: 05/24/2023]
Abstract
One-dimensional 2,9,16,23-tetra-nitrophthalocyanine iron(II) (TNFePc)/TiO(2) nanofiber heterostructures have been successfully obtained by a simple combination of electrospinning technique and solvothermal process. The as-obtained products were characterized by field emission scanning electron microscopy (FE-SEM), energy-dispersive X-ray (EDX) spectroscopy, transmission electron microscopy (TEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and IR spectrum. The results revealed that the TNFePc nanosheets were successfully grown on the primary TiO(2) nanofibers. And, the coverage density of the secondary TNFePc nanostructures could be controlled by adjusting the experimental parameters. Photocatalytic tests displayed that the H(2)O(2) assisted TNFePc/TiO(2) nanofiber heterostructures (TNFePc/TiO(2)-H(2)O(2)) possessed a much higher degradation rate of methyl orange than the pure TiO(2) and TNFePc/TiO(2) nanofiber without H(2)O(2) under visible light. Moreover, the TNFePc/TiO(2) nanofiber heterostructures could be easily recycled without the decrease of the photocatalytic activity due to their one-dimensional nanostructural property of TiO(2) nanofibers.
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Affiliation(s)
- Zengcai Guo
- Department of Chemistry, Northeast Normal University, Changchun, People's Republic of China
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Yang Y, Zhang G, Xu W. Facile synthesis and photocatalytic properties of AgAgClTiO2/rectorite composite. J Colloid Interface Sci 2012; 376:217-23. [DOI: 10.1016/j.jcis.2012.03.003] [Citation(s) in RCA: 101] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2011] [Revised: 02/19/2012] [Accepted: 03/01/2012] [Indexed: 11/15/2022]
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AgIO3-modified AgI/TiO2 composites for photocatalytic degradation of p-chlorophenol under visible light irradiation. J Colloid Interface Sci 2012; 378:159-66. [PMID: 22572219 DOI: 10.1016/j.jcis.2012.04.020] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2011] [Revised: 04/06/2012] [Accepted: 04/10/2012] [Indexed: 11/21/2022]
Abstract
Semiconducting silver iodate (AgIO(3)) was used to modify the visible light response of an AgI/TiO(2) (AIT) catalyst by a facile method. The uncalcined AIT (AITun) and AIT calcined at 200°C (AIT200) consisted of AgIO(3), AgI, and TiO(2) semiconductors, while that calcined at 450 °C (AIT450) was composed of AgI and TiO(2). The activity in p-chlorophenol (PCP) degradation under visible light irradiation using either AITun or AIT200 was much higher than that with AIT450, which was mainly attributed to the fact that the presence of AgIO(3) provided a new matching band potential. AIT200 exhibited better photocatalytic properties than AITun due to its higher crystallinity after calcination. Moreover, the high catalytic activity of AIT200 was maintained after five successive cyclic experiments under visible irradiation. Considering the effect of radical scavengers and N(2) purging on the photocatalysis process, we deduced that the probable pathway of PCP degradation was mainly a surface charge process, caused by valence band holes.
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Liu Y, Yu H, Lv Z, Zhan S, Yang J, Peng X, Ren Y, Wu X. Simulated-sunlight-activated photocatalysis of methylene blue using cerium-doped SiO2/TiO2 nanostructured fibers. J Environ Sci (China) 2012; 24:1867-75. [PMID: 23520858 DOI: 10.1016/s1001-0742(11)61008-5] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
Cerium-doped SiO2/TiO2 nanostructured fibers were fabricated by electrospinning technology. The prepared fibers were characterized by thermogravimetric analysis (TGA), scanning electron microscopy (SEM), X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FT-IR). Using the fibers as catalysts, photocatalytic degradation of Methylene Blue (MB) aqueous solution was carried out under simulated sunlight. The 0.2% Ce doping proved to be the optimal concentration for the doping of TiO2/SiO2, compared to other Ce-doped molar concentrations. The 0.2% Ce-doped SiO2/TiO2 fibers exhibited higher photocatalytic activity than industrial Degussa P25 and the samples doped with only Ce or SiO2. The reasons for improving the photocatalytic activity were also discussed. Several operational parameters were studied, which showed that the photocatalytic efficiency of MB was influenced by parameters such as the initial dye concentration, the initial pH, inorganic anions, and so on. In addition, the influences of an electron acceptor and a radical scavenger suggested that OH was the dominant photooxidant during the photocatalytic process. The reuse evaluation of the fibers indicated that their photocatalytic activity had good stability.
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Affiliation(s)
- Yu Liu
- College of Environmental Science and Engineering, Nankai University, Tianjin 300071, China.
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Islam MM, Bredow T, Gerson A. Electronic Properties of Vanadium-Doped TiO2. Chemphyschem 2011; 12:3467-73. [DOI: 10.1002/cphc.201100557] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2011] [Indexed: 11/07/2022]
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Zhang M, Shao C, Guo Z, Zhang Z, Mu J, Cao T, Liu Y. Hierarchical nanostructures of copper(II) phthalocyanine on electrospun TiO(2) nanofibers: controllable solvothermal-fabrication and enhanced visible photocatalytic properties. ACS APPLIED MATERIALS & INTERFACES 2011; 3:369-377. [PMID: 21218852 DOI: 10.1021/am100989a] [Citation(s) in RCA: 82] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
In the present work, 2,9,16,23-tetranitrophthalocyanine copper(II) (TNCuPc)/TiO(2) hierarchical nanostructures were successfully fabricated by a simple combination method of electrospinning technique and solvothermal processing. Scanning electron microscopy (SEM), energy-dispersive X-ray (EDX) spectroscopy, X-ray diffraction (XRD), UV-vis diffuse reflectance (DR), Fourier transform infrared spectrum (FT-IR), X-ray photoelectron spectroscopy (XPS), and thermal gravimetric and differential thermal analysis (TG-DTA) were used to characterize the as-synthesized TNCuPc/TiO(2) hierarchical nanostructures. The results showed that the secondary TNCuPc nanostructures were not only successfully grown on the primary TiO(2) nanofibers substrates but also uniformly distributed without aggregation. By adjusting the solvothermal fabrication parameters, the TNCuPc nanowires or nanoflowers were facilely fabricated, and also the loading amounts of TNCuPc could be controlled on the TNCuPc/TiO(2) hierarchical nanostructural nanofibers. And, there might exist the interaction between TNCuPc and TiO(2). A possible mechanism for the formation of TNCuPc/TiO(2) hierarchical nanostructures was suggested. The photocatalytic studies revealed that the TNCuPc/TiO(2) hierarchical nanostructures exhibited enhanced photocatalytic efficiency of photodegradation of Rhodamine B (RB) compared with the pure TNCuPc or TiO(2) nanofibers under visible-light irradiation.
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Affiliation(s)
- Mingyi Zhang
- Center for Advanced Optoelectronic Functional Materials Research and Key Laboratory of UV Light-Emitting Materials and Technology of Ministry of Education, Northeast Normal University, 5268 Renmin Street, Changchun 130024, People's Republic of China
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Calleja A, Granados X, Ricart S, Oró J, Arbiol J, Mestres N, Carrillo AE, Palmer X, Cano F, Tornero JA, Puig T, Obradors X. High temperature transformation of electrospun BaZrO3 nanotubes into nanoparticle chains. CrystEngComm 2011. [DOI: 10.1039/c1ce05108c] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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