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Yang X, Li K, Wang C, Wang F, Sun X, Ma Y, Li Y, Shi L, Ning P. Cu/ACF adsorbent modified by non-thermal plasma for simultaneous adsorption-oxidation of H 2S and PH 3. J Environ Sci (China) 2023; 127:641-651. [PMID: 36522093 DOI: 10.1016/j.jes.2022.06.011] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2022] [Revised: 06/06/2022] [Accepted: 06/07/2022] [Indexed: 06/17/2023]
Abstract
Non-thermal plasma (NTP) surface modification technology is a new method to control the surface properties of materials, which has been widely used in the field of environmental protection because of its short action time, simple process and no pollution. In this study, Cu/ACF (activated carbon fiber loaded with copper) adsorbent was modified with NTP to remove H2S and PH3 simultaneously under low temperature and micro-oxygen condition. Meanwhile, the effects of different modified atmosphere (air, N2 and NH3), specific energy input (0-13 J/mL) and modification time (0-30 min) on the removal of H2S and PH3 were investigated. Performance test results indicated that under the same reaction conditions, the adsorbent modified by NH3 plasma with 5 J/mL for 10 min had the best removal effect on H2S and PH3. CO2 temperature-programmed desorption and X-ray photoelectron spectroscopy (XPS) analyzes showed that NH3 plasma modification could introduce amino functional groups on the surface of the adsorbent, and increase the types and number of alkaline sites on the surface. Brunauer-Emmett-Teller and scanning electron microscopy showed that NH3 plasma modification did not significantly change the pore size structure of the adsorbent, but more active components were evenly exposed to the surface, thus improving the adsorption performance. In addition, X-ray diffraction and XPS analysis indicated that the consumption of active components (Cu and Cu2O) and the accumulation of sulfate and phosphate on the surface and inner pores of the adsorbent are the main reasons for the deactivation of the adsorbent.
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Affiliation(s)
- Xinyu Yang
- Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, China
| | - Kai Li
- Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, China; National-Regional Engineering Center for Recovery of Waste Gases from Metallurgical and Chemical Industries, Kunming University of Science and Technology, Kunming 650500, China
| | - Chi Wang
- Faculty of Chemical Engineering, Kunming University of Science and Technology, Kunming 650500, China.
| | - Fei Wang
- Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, China
| | - Xin Sun
- Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, China
| | - Yixing Ma
- Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, China
| | - Yuan Li
- Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, China
| | - Lei Shi
- Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, China
| | - Ping Ning
- Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, China; National-Regional Engineering Center for Recovery of Waste Gases from Metallurgical and Chemical Industries, Kunming University of Science and Technology, Kunming 650500, China.
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Martín-Gómez J, Reca-Expósito S, López-Tenllado FJ, Hidalgo-Carrillo J, Marinas A, Urbano FJ. Synthesis of Fe-TiO 2 and Cu-TiO 2 Based Materials by Olive Leaves Biotemplating-Application to Hydrogen Production from Glycerol Photoreforming. NANOMATERIALS (BASEL, SWITZERLAND) 2023; 13:664. [PMID: 36839032 PMCID: PMC9966289 DOI: 10.3390/nano13040664] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/16/2023] [Revised: 02/03/2023] [Accepted: 02/06/2023] [Indexed: 06/18/2023]
Abstract
Hydrogen production is mainly based on the use of fossil fuels, but currently, many alternative routes are being developed, among which the photo-reforming of oxygenated organic compounds stands out. Recently, several studies have been carried out in order to develop new techniques to create bio-inspired TiO2 structures. One of these is 'biotemplating', a process that replicates a biological system in an inorganic TiO2-based structure. In this study, olive by-products-olive leaves-are valorized as a biotemplate for the synthesis of new Fe-TiO2- and Cu-TiO2-based photocatalysts with the aim of improving the replication of the leaf structure and enhancing hydrogen photoproduction. In conclusion, the incorporation of iron and copper decreases the band gap and increases the energetic disorder at the band edges. Moreover, it is verified by SEM and TEM that the metals are not found forming particles but are introduced into the formed TiO2 structure. The accuracy of the internal and external structure replication is improved with the incorporation of Fe in the synthesis, while the incorporation of Cu substantially improves the production of hydrogen, which is multiplied 14 times under UV light and 6 times under sunlight, as compared to a pure TiO2 structure.
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Clarizia L, Vitiello G, Bericat Vadell R, Sá J, Marotta R, Di Somma I, Andreozzi R, Luciani G. Effect of Synthesis Method on Reaction Mechanism for Hydrogen Evolution over Cu xO y/TiO 2 Photocatalysts: A Kinetic Analysis. Int J Mol Sci 2023; 24:2004. [PMID: 36768327 PMCID: PMC9916258 DOI: 10.3390/ijms24032004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2022] [Revised: 01/12/2023] [Accepted: 01/16/2023] [Indexed: 01/21/2023] Open
Abstract
The existing literature survey reports rare and conflicting studies on the effect of the preparation method of metal-based semiconductor photocatalysts on structural/morphological features, electronic properties, and kinetics regulating the photocatalytic H2 generation reaction. In this investigation, we compare the different copper/titania-based photocatalysts for H2 generation synthesized via distinct methods (i.e., photodeposition and impregnation). Our study aims to establish a stringent correlation between physicochemical/electronic properties and photocatalytic performances for H2 generation based on material characterization and kinetic modeling of the experimental outcomes. Estimating unknown kinetic parameters, such as charge recombination rate and quantum yield, suggests a mechanism regulating charge carrier lifetime depending on copper distribution on the TiO2 surface. We demonstrate that H2 generation photoefficiency recorded over impregnated CuxOy/TiO2 is related to an even distribution of Cu(0)/Cu(I) on TiO2, and the formation of an Ohmic junction concertedly extended charge carrier lifetime and separation. The outcomes of the kinetic analysis and the related modeling investigation underpin photocatalyst physicochemical and electronic properties. Overall, the present study lays the groundwork for the future design of metal-based semiconductor photocatalysts with high photoefficiencies for H2 evolution.
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Affiliation(s)
- Laura Clarizia
- Department of Chemical, Materials and Industrial Production Engineering, University of Naples “Federico II”, p.le V. Tecchio 80, 80125 Napoli, Italy
| | - Giuseppe Vitiello
- Department of Chemical, Materials and Industrial Production Engineering, University of Naples “Federico II”, p.le V. Tecchio 80, 80125 Napoli, Italy
- CSGI, Center for Colloid and Interface Science, via della Lastruccia 3, 50019 Sesto Fiorentino, Italy
| | - Robert Bericat Vadell
- Department of Chemistry-Ångström, Physical Chemistry Division, Uppsala University, P.O. Box 532, 751 20 Uppsala, Sweden
| | - Jacinto Sá
- Department of Chemistry-Ångström, Physical Chemistry Division, Uppsala University, P.O. Box 532, 751 20 Uppsala, Sweden
- Institute of Physical Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224 Warsaw, Poland
| | - Raffaele Marotta
- Department of Chemical, Materials and Industrial Production Engineering, University of Naples “Federico II”, p.le V. Tecchio 80, 80125 Napoli, Italy
| | - Ilaria Di Somma
- Istituto di Scienze e Tecnologie per l’Energia e la Mobilità Sostenibili (STEMS)-Consiglio Nazionale delle Ricerche, p.le V. Tecchio 80, 80125 Napoli, Italy
| | - Roberto Andreozzi
- Department of Chemical, Materials and Industrial Production Engineering, University of Naples “Federico II”, p.le V. Tecchio 80, 80125 Napoli, Italy
| | - Giuseppina Luciani
- Department of Chemical, Materials and Industrial Production Engineering, University of Naples “Federico II”, p.le V. Tecchio 80, 80125 Napoli, Italy
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Munusamy TD, Chin SY, Khan MMR. Hydrogen production via photoreforming of wastewater under LED light-driven over CuO@exfoliated g-C 3N 4 nanoheterojunction. CHEMOSPHERE 2022; 301:134649. [PMID: 35452649 DOI: 10.1016/j.chemosphere.2022.134649] [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: 02/15/2022] [Revised: 04/04/2022] [Accepted: 04/14/2022] [Indexed: 06/14/2023]
Abstract
As the global interest heading towards net zero emission by 2050, clean hydrogen production technologies becomes limelight among the research community. Besides, the generation of large quantity of industrial wastewaters creates huge dilemma and needs special attention. In this work, synthetic wastewater using formaldehyde (FA) as a model organic pollutant was utilized to produce hydrogen. The photocatalyst, CuO@exfoliated g-C3N4 nanoheterojunction was synthesized by an acid treatment and facile chemical precipitation technique. XRD results confirmed the successful formation of exfoliated g-C3N4 by expanding the interlayer spacing of the nanosheets via shifting of characteristic peak of graphite towards lower 2θ from 27.97° to 27.04°. Meanwhile, the BET surface area of CuO@exfoliated g-C3N4 (199.3 m2/g) was remarkably enhanced as compared to bulk g-C3N4 (34.5 m2/g) and exfoliated g-C3N4 (104.4 m2/g). The existence of large pores (3.55 cm3/g) in CuO@exfoliated g-C3N4 promotes the accessibility of reactant to the surface active sites, escalating the redox reactions. Study on hydrogen production via photoreforming of aqueous formaldehyde over the prepared photocatalysts were conducted. Interestingly, hydrogen generated using CuO@exfoliated g-C3N4 (3867 μmol/g) was greatly enhanced by 7 times and 13 times than the counterparts catalysts, exfoliated g-C3N4 (532 μmol/g) and pure CuO (271 μmol/g) respectively. By employing the CuO@exfoliated g-C3N4 nanoheterojunction, the optimum hydrogen with apparent quantum efficiency (AQE) of 5664 μmol/g and 22% were obtained respectively. Besides, S-scheme reaction mechanism was proposed based on heterojunction formed between the p-type CuO and n-type exfoliated g-C3N4 nanosheets.
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Affiliation(s)
- Thurga Devi Munusamy
- Department of Chemical Engineering, College of Engineering, Universiti Malaysia Pahang, Lebuhraya Tun Razak, 26300, Gambang, Kuantan, Pahang, Malaysia
| | - Sim Yee Chin
- Department of Chemical Engineering, College of Engineering, Universiti Malaysia Pahang, Lebuhraya Tun Razak, 26300, Gambang, Kuantan, Pahang, Malaysia; Centre of Excellence for Advanced Research in Fluid Flow (CARIFF), Universiti Malaysia Pahang, 26300, Gambang, Kuantan, Pahang, Malaysia
| | - Md Maksudur Rahman Khan
- Department of Chemical Engineering, College of Engineering, Universiti Malaysia Pahang, Lebuhraya Tun Razak, 26300, Gambang, Kuantan, Pahang, Malaysia; Centre of Excellence for Advanced Research in Fluid Flow (CARIFF), Universiti Malaysia Pahang, 26300, Gambang, Kuantan, Pahang, Malaysia.
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Fischer DK, Rodrigues de Fraga K, Scheeren CW. Ionic liquid/TiO 2 nanoparticles doped with non-expensive metals: new active catalyst for phenol photodegradation. RSC Adv 2022; 12:2473-2484. [PMID: 35425271 PMCID: PMC8979310 DOI: 10.1039/d1ra08459c] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2021] [Accepted: 12/22/2021] [Indexed: 11/21/2022] Open
Abstract
TiO2 nanoparticles were synthesized using 1-n-butyl-3-methylimidazolium tetrafluoroborate (BMI·BF4) ionic liquid and doped with non-expensive metals Cu2+ and Fe3+ by the sol–gel method. The new generated photocatalysts had their morphological, textural and structural characteristics analysed by scanning electron microscopy and dispersive X-ray spectroscopy (SEM/EDS), transmission electron microscopy (TEM), Brunauer–Emmett–Teller analysis (BET), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD) and diffuse reflectance spectroscopy (DRS). The results showed two phases by XRD analysis, anatase (majority) and rutile (minority). The SEM micrographs exposed spherical TiO2 NPs/BMI·BF4 IL and compact layers for Cu2+ and Fe3+-doped TiO2 NPs in BMI·BF4 IL, the EDX confirmed only the presence of Ti, O, Fe and Cu. The BET and BJH analyses exhibited high porous TiO2 NPs/BMI·BF4 IL. The BET and BJH analyses confirmed that the pore diameter of mesoporous materials was between 12 and 16 nm with similar values for surface area (55–63 m2 g−1). The TEM images exhibited spherical shape nanoparticles with mean diameter of 20–22 nm. The DRS analysis and Tauc equation were applied to estimate the optical energy band gap of the photocatalysts. The energy band gap values of 3.1 eV, 3.32 eV, and 2.78 eV were obtained for TiO2 NPs/BMI·BF4 IL, 1% Fe3+-doped TiO2 NPs/BMI·BF4 IL and 1% Cu2+-doped TiO2 NPs/BMI·BF4 IL, respectively. Phenol photodegradation was realized using Cu2+ and Fe3+-doped TiO2 NPs/BMI·BF4 IL under UV/visible irradiation and quantified by HPLC-FLD. The phenol photodegradation was investigated by different concentrations of metal-doped TiO2 NPs/BMI·BF4 IL. The new active photocatalysts 1% Cu2+-doped TiO2 NPs and 1% Fe3+-doped TiO2 NPs/BMI·BF4 IL exhibited high catalytic activity (99.9% and 96.8%, respectively). The photocatalysts 1% Cu2+ and 1% Fe3+-doped TiO2 NPs/BMI·BF4 IL were also evaluated using industrial wastewater from the tobacco industry. The results showed 56.7% phenol photodegradation, due to the complexity of the tobacco matrix wastewater. TiO2 nanoparticles were synthesized using 1-n-butyl-3-methylimidazolium tetrafluoroborate (BMI·BF4) ionic liquid and doped with non-expensive metals Cu2+ and Fe3+ by the sol–gel method.![]()
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Affiliation(s)
- Daiane Kessler Fischer
- Laboratory of Catalysis and Nanomaterials, School of Chemistry and Food, Federal University of Rio Grande-FURG Rua Barão do Caí, 125 CEP 95500-000 Santo Antônio da Patrulha RS Brazil
| | - Karina Rodrigues de Fraga
- Laboratory of Catalysis and Nanomaterials, School of Chemistry and Food, Federal University of Rio Grande-FURG Rua Barão do Caí, 125 CEP 95500-000 Santo Antônio da Patrulha RS Brazil
| | - Carla Weber Scheeren
- Laboratory of Catalysis and Nanomaterials, School of Chemistry and Food, Federal University of Rio Grande-FURG Rua Barão do Caí, 125 CEP 95500-000 Santo Antônio da Patrulha RS Brazil
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6
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Photocatalytic Performance of Carbon-Containing CuMo-Based Catalysts under Sunlight Illumination. Catalysts 2022. [DOI: 10.3390/catal12010046] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
Carbon-doped nanostructured CuMo-based photocatalysts were prepared by solvothermal synthesis. Two thermal treatments—oxidative and inert atmosphere—were used for the synthesis of the catalysts, and the influence of spherical carbon structures upon the crystalline phases on the photocatalytic activity and stability was studied. XRD showed the catalysts are nanostructured and composed by a mixture of copper (Cu, Cu2O, and CuO) and molybdenum (MoO2 and MoO3) crystalline phases. The catalysts were used for the degradation of yellow 5 under solar light. A remarkable leaching of Mo both in dark and under solar irradiation was observed and quantified. This phenomenon was responsible for the loss of photocatalytic activity for the degradation of the dye on the Mo-containing series. Conversely, the Cu-based photocatalysts were stable, with no leaching observed after 6 h irradiation and with a higher conversion of yellow 5 compared with the Mo- and CuMo series. The stability of Cu-based catalysts was attributed to a protective effect of spherical carbon structures formed during the solvothermal synthesis. Regarding the catalysts’ composition, sample Cu4-800-N2 prepared by pyrolysis exhibited up to 4.4 times higher photoactivity than that of the pristine material, which is attributed to a combined effect of an enhanced surface area and micropore volume generated during the pyrolytic treatment due to the presence of the carbon component in the catalyst. Scavenger tests have revealed that the mechanism for tartrazine degradation on irradiated Cu-based catalysts involves successive attacks of •OH radicals.
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Corredor J, Harankahage D, Gloaguen F, Rivero MJ, Zamkov M, Ortiz I. Influence of QD photosensitizers in the photocatalytic production of hydrogen with biomimetic [FeFe]-hydrogenase. Comparative performance of CdSe and CdTe. CHEMOSPHERE 2021; 278:130485. [PMID: 33839391 DOI: 10.1016/j.chemosphere.2021.130485] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/27/2021] [Revised: 03/20/2021] [Accepted: 04/02/2021] [Indexed: 06/12/2023]
Abstract
Photocatalytic systems comprising a hydrogenase-type catalyst and CdX (X = S, Se, Te) chalcogenide quantum dot (QD) photosensitizers show extraordinary hydrogen production rates under visible light excitation. What remains unknown is the mechanism of energy conversion in these systems. Here, we have explored this question by comparing the performance of two QD sensitizers, CdSe and CdTe, in photocatalytic systems featuring aqueous suspensions of a [Fe2 (μ-1,2-benzenedithiolate) CO6] catalyst and an ascorbic acid sacrificial agent. Overall, the hydrogen production yield for CdSe-sensitized reactions QDs was found to be 13 times greater than that of CdTe counterparts. According to emission quenching experiments, an enhanced performance of CdSe sensitizers reflected a greater rate of electron transfer from the ascorbic acid (kAsc). The observed difference in the QD-ascorbic acid charge transfer rates between the two QD materials was consistent with respective driving forces for these systems.
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Affiliation(s)
- Juan Corredor
- Department of Chemical and Biomolecular Engineering, ETSIIT, University of Cantabria, Avda. de Los Castros S/n, 39005, Santander, Spain
| | - Dulanjan Harankahage
- Department of Physics and Center for Photochemical Sciences, Bowling Green State University, Bowling Green, OH, 43043, USA
| | - Frederic Gloaguen
- UMR 6521, CNRS, Université de Bretagne Occidentale, CS 93837, 29238, Brest, France
| | - Maria J Rivero
- Department of Chemical and Biomolecular Engineering, ETSIIT, University of Cantabria, Avda. de Los Castros S/n, 39005, Santander, Spain
| | - Mikhail Zamkov
- Department of Physics and Center for Photochemical Sciences, Bowling Green State University, Bowling Green, OH, 43043, USA
| | - Inmaculada Ortiz
- Department of Chemical and Biomolecular Engineering, ETSIIT, University of Cantabria, Avda. de Los Castros S/n, 39005, Santander, Spain.
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8
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Albukhari SM, Shawky A. Ag/Ag2O-decorated sol-gel-processed TeO2 nanojunctions for enhanced H2 production under visible light. J Mol Liq 2021. [DOI: 10.1016/j.molliq.2021.116870] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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9
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Photoelectrochemical Hydrogen Production by Screen-Printed Copper Oxide Electrodes. ENERGIES 2021. [DOI: 10.3390/en14102942] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
In this work, copper oxides-based photocathodes for photoelectrochemical cells (PEC) were produced for the first time by screen printing. A total 7 × 10−3 g/m2 glycerine trioleate was found as optimum deflocculant amount to assure stable and homogeneous inks, based on CuO nano-powder. The inks were formulated considering different binder amounts and deposited producing films with homogenous thickness, microstructure, and roughness. The as-produced films were thermally treated to obtain Cu2O- and Cu2O/CuO-based electrodes. The increased porosity obtained by adding higher amounts of binder in the ink positively affected the electron transfer from the surface of the electrode to the electrolyte, thus increasing the corresponding photocurrent values. Moreover, the Cu2O/CuO system showed a higher charge carrier and photocurrent density than the Cu2O-based one. The mixed Cu2O/CuO films allowed the most significant hydrogen production, especially in slightly acid reaction conditions.
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Díaz L, Rodríguez VD, González-Rodríguez M, Rodríguez-Castellón E, Algarra M, Núñez P, Moretti E. M/TiO 2 (M = Fe, Co, Ni, Cu, Zn) catalysts for photocatalytic hydrogen production under UV and visible light irradiation. Inorg Chem Front 2021. [DOI: 10.1039/d0qi01311k] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
Cu/TiO2 photocatalysts can be considered a promising low-cost alternative to the well-known Pt/TiO2 system for hydrogen production under UV-Vis irradiation.
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Affiliation(s)
- L. Díaz
- Departamento de Química
- U.D. Química Inorgánica
- Universidad de La Laguna
- 38206 La Laguna
- Spain
| | - V. D. Rodríguez
- Departamento de Física
- Universidad de La Laguna
- 38206 La Laguna
- Spain
- Instituto Universitario de Materiales y Nanotecnología
| | - M. González-Rodríguez
- Departamento de Química
- U.D. Química Inorgánica
- Universidad de La Laguna
- 38206 La Laguna
- Spain
| | - E. Rodríguez-Castellón
- Departamento de Química Inorgánica
- Facultad de Ciencias
- Universidad de Málaga
- 29010 Málaga
- Spain
| | - M. Algarra
- Departamento de Química Inorgánica
- Facultad de Ciencias
- Universidad de Málaga
- 29010 Málaga
- Spain
| | - P. Núñez
- Departamento de Química
- U.D. Química Inorgánica
- Universidad de La Laguna
- 38206 La Laguna
- Spain
| | - E. Moretti
- Dipartimento di Scienze Molecolari e Nanosistemi
- Università Ca’ Foscari Venezia
- 30172 Mestre Venezia
- Italy
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11
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Yang F, Yang R, Yan L, Wu J, Liu X, Yang L, Zhong M, Luo X, Zhang L. Enhancement of Titania Photoanode Performance by Sandwiching Copper between Two Titania Layers. MATERIALS (BASEL, SWITZERLAND) 2020; 13:E4326. [PMID: 32998460 PMCID: PMC7579609 DOI: 10.3390/ma13194326] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/06/2020] [Revised: 09/08/2020] [Accepted: 09/10/2020] [Indexed: 11/17/2022]
Abstract
Vacancies in semiconductors can play a versatile role in boosting their photocatalytic activity. In this work, a novel TiO2/Cu/TiO2 sandwich structure is designed and constructed. Abundant vacancies were introduced in TiO2 lattice by Cu reduction under heat treatment. Meanwhile, Cu atom could diffuse into TiO2 to form Cu-doped TiO2. The synergistic effect between oxygen vacancies and Cu atoms achieved about 2.4 times improved photocurrent of TiO2/Cu/TiO2 sandwich structure compared to bare TiO2 thin film. The enhanced photoactivity may be attributed to regulated electron structure of TiO2 by oxygen vacancies and Cu dopant from experimental results and density functional theory calculations. Oxygen vacancies and Cu dopant in TiO2 formed through copper metal reduction can introduce impurity levels and narrow the band gap of TiO2, thus improve the visible light response. More importantly, the Cu2+ and oxygen vacancies in TiO2 lattice can dramatically increase the charge density around conduction band and promote separation of photo-induced charge carriers. Furthermore, the oxygen vacancies on the surface may serve as active site for sufficient chemical reaction. This work presents a novel method to prepare doped metal oxides catalysts with abundant vacancies for improving photocatalytic activity.
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Affiliation(s)
- Fan Yang
- Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang 621900, China; (F.Y.); (R.Y.); (L.Y.); (J.W.); (X.L.); (L.Y.); (M.Z.); (L.Z.)
- Department of Physics, University of Science and Technology of China, Hefei 230026, China
| | - Ruizhuang Yang
- Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang 621900, China; (F.Y.); (R.Y.); (L.Y.); (J.W.); (X.L.); (L.Y.); (M.Z.); (L.Z.)
| | - Lin Yan
- Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang 621900, China; (F.Y.); (R.Y.); (L.Y.); (J.W.); (X.L.); (L.Y.); (M.Z.); (L.Z.)
| | - Jiankun Wu
- Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang 621900, China; (F.Y.); (R.Y.); (L.Y.); (J.W.); (X.L.); (L.Y.); (M.Z.); (L.Z.)
| | - Xiaolin Liu
- Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang 621900, China; (F.Y.); (R.Y.); (L.Y.); (J.W.); (X.L.); (L.Y.); (M.Z.); (L.Z.)
- Department of Physics, University of Science and Technology of China, Hefei 230026, China
| | - Lirong Yang
- Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang 621900, China; (F.Y.); (R.Y.); (L.Y.); (J.W.); (X.L.); (L.Y.); (M.Z.); (L.Z.)
| | - Minglong Zhong
- Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang 621900, China; (F.Y.); (R.Y.); (L.Y.); (J.W.); (X.L.); (L.Y.); (M.Z.); (L.Z.)
| | - Xuan Luo
- Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang 621900, China; (F.Y.); (R.Y.); (L.Y.); (J.W.); (X.L.); (L.Y.); (M.Z.); (L.Z.)
| | - Lin Zhang
- Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang 621900, China; (F.Y.); (R.Y.); (L.Y.); (J.W.); (X.L.); (L.Y.); (M.Z.); (L.Z.)
- Department of Physics, University of Science and Technology of China, Hefei 230026, China
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12
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Hinojosa-Reyes M, Camposeco Solis R, Rodríguez-González V, Ruiz F. Recycling of copper-adsorbed titanate nanotubes (TNTs) for photocatalytic hydrogen production. SEP SCI TECHNOL 2020. [DOI: 10.1080/01496395.2020.1788598] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
| | - Roberto Camposeco Solis
- Instituto De Ciencias Aplicadas Y Tecnología, Universidad Nacional Autónoma de México, México
| | - Vicente Rodríguez-González
- División De Materiales Avanzados, IPICYT, Instituto Potosino De Investigación Científica Y Tecnológica, 78216, San Luis Potosí, México
| | - Facundo Ruiz
- Facultad De Ciencias, Universidad Autónoma De San Luis Potosí, San Luis Potosí, México
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Zhang X, Chen Y, Shang Q, Guo Y. Copper doping and organic sensitization enhance photocatalytic activity of titanium dioxide: Efficient degradation of phenol and tetrabromobisphenol A. THE SCIENCE OF THE TOTAL ENVIRONMENT 2020; 716:137144. [PMID: 32059292 DOI: 10.1016/j.scitotenv.2020.137144] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/20/2019] [Revised: 02/04/2020] [Accepted: 02/04/2020] [Indexed: 06/10/2023]
Abstract
A novel photocatalyst (Cu-TiO2@HQ) had been synthesized by combining Cu-doped TiO2 nanoparticles with 8-Hydroxyquinoline (HQ) via hydrothermal method. The photocatalytic activities of Cu-TiO2@HQ were investigated by using phenol and tetrabromobisphenol A (TBBPA) as target pollutants, respectively. The results indicated that the degradation efficiencies of phenol and TBBPA by Cu-TiO2@HQ were 99.2% (in 30 min) and 99.4% (in 10 min) under visible light irradiation. Both of them were much better than that of pure TiO2 (8.63% in 30 min) and Cu-TiO2 (14.74% in 30 min). When phenol or TBBPA were degraded together with the reduction of Cr (VI), the reaction rate of each pollutant was significantly increased, and the cyclic stability of photocatalyst Cu-TiO2@HQ was greatly improved. Based on the spectroscopic and photoelectric characteristic analysis we found that in the mixture of phenol-Cr (VI) or TBBPA-Cr (VI) both photo-generated electrons and holes can be consumed simultaneously, thus preventing their recombination. The possible degradation products of phenol and TBBPA including its degradation path way were also analyzed by high resolution liquid chromatography-mass spectrometry-mass spectrometry.
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Affiliation(s)
- Xiaoyan Zhang
- Faculty of Chemistry, Northeast Normal University, Changchun 130024, China
| | - Yunning Chen
- Faculty of Chemistry, Northeast Normal University, Changchun 130024, China
| | - Qingkun Shang
- Faculty of Chemistry, Northeast Normal University, Changchun 130024, China.
| | - Yingna Guo
- Faculty of Chemistry, Northeast Normal University, Changchun 130024, China
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Aslam S, Sagar RUR, Kumar H, Zhang G, Nosheen F, Namvari M, Mahmood N, Zhang M, Qiu Y. Mixed-dimensional heterostructures of hydrophobic/hydrophilic graphene foam for tunable hydrogen evolution reaction. CHEMOSPHERE 2020; 245:125607. [PMID: 31884174 DOI: 10.1016/j.chemosphere.2019.125607] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/08/2019] [Revised: 11/26/2019] [Accepted: 12/08/2019] [Indexed: 06/10/2023]
Abstract
The synergetic effect of hydrophilic and hydrophobic carbon can be used to obtain tunable hydrogen evolution reaction (HER) at the interface. Herein, graphene oxide (GO-Hummers method) was coated on graphene foam (GF) synthesized via chemical vapor deposition to develop mixed-dimensional heterostructure for the observation of HER. The porosity of GF not only provides an optimized diffusion coefficient for better mass transport but also modified surface chemistry (GF/GO-hydrophobic/hydrophilic interface), which results in an onset potential 50 mV and overpotential of 450 mV to achieve the current density 10 mA/cm2. The surface analysis shows that inherent functional groups at the surface played a key role in tuning the activity of hybrid, providing a pathway to introduce non-corrosive electrodes for water splitting.
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Affiliation(s)
- Sehrish Aslam
- Shenzhen Engineering Lab of Flexible Transparent Conductive Films, School of Materials Science and Engineering, Harbin Institute of Technology, Shenzhen, 518055, China
| | - Rizwan Ur Rehman Sagar
- Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen, 518055, China.
| | - Hitanshu Kumar
- College of Materials Science and Engineering, Shenzhen University, Shenzhen, 518055, China
| | - Gaowei Zhang
- Shenzhen Engineering Lab of Flexible Transparent Conductive Films, School of Materials Science and Engineering, Harbin Institute of Technology, Shenzhen, 518055, China
| | - Farhat Nosheen
- Department of Chemistry, Division of Science & Technology, University of Education, Lahore, Pakistan
| | - Mina Namvari
- Regional Centre for Advanced Technologies and Materials, Department of Physical Chemistry, Faculty of Science, Palacký University Olomouc, 17. listopadu 1192/12, 771 46, Olomouc, Czech Republic
| | - Nasir Mahmood
- School of Engineering, RMIT University, 124 La Trobe Street, 3001, Melbourne, Victoria, Australia.
| | - Min Zhang
- Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen, 518055, China.
| | - Yejun Qiu
- Shenzhen Engineering Lab of Flexible Transparent Conductive Films, School of Materials Science and Engineering, Harbin Institute of Technology, Shenzhen, 518055, China.
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Pedroza-Herrera G, Medina-Ramírez IE, Lozano-Álvarez JA, Rodil SE. Evaluation of the Photocatalytic Activity of Copper Doped TiO2 nanoparticles for the Purification and/or Disinfection of Industrial Effluents. Catal Today 2020. [DOI: 10.1016/j.cattod.2018.09.017] [Citation(s) in RCA: 42] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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16
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Preparation of nanoparticulate TiO2 containing nanocrystalline phases of anatase and brookite by electrochemical dissolution of remelted titanium components. ARAB J CHEM 2020. [DOI: 10.1016/j.arabjc.2018.07.015] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
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17
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Near UV‐Irradiation of CuO
x
‐Impregnated TiO
2
Providing Active Species for H
2
Production Through Methanol Photoreforming. ChemCatChem 2019. [DOI: 10.1002/cctc.201900818] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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18
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Xie X, Li S, Zhang H, Wang Z, Huang H. Promoting charge separation of biochar-based Zn-TiO 2/pBC in the presence of ZnO for efficient sulfamethoxazole photodegradation under visible light irradiation. THE SCIENCE OF THE TOTAL ENVIRONMENT 2019; 659:529-539. [PMID: 31096382 DOI: 10.1016/j.scitotenv.2018.12.401] [Citation(s) in RCA: 41] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/10/2018] [Revised: 12/17/2018] [Accepted: 12/26/2018] [Indexed: 05/27/2023]
Abstract
A novel and effective photocatalyst namely titanium dioxide doped with zinc elements stacked on reed straw biochar which was pretreated by acid (Zn-TiO2/pBC) with visible light response was successfully prepared by a simple modified sol-gel method firstly. The prepared samples were characterized by scanning microscopy (SEM), energy dispersive X-ray spectrum (EDS), X-ray diffraction (XRD), nitrogen adsorption-desorption (BET) and UV-Vis diffuse reflectance spectra (DRS). The photocatalytic activity of Zn-TiO2/pBC was further investigated through the photodegradation of sulfamethoxazole (SMX). Compared with TiO2 and TiO2/pBC, Zn-TiO2/pBC had better photocatalytic activity under visible light due to zinc elements effectively inhibiting the agglomeration of TiO2 and hindering the combination of photogenerated electrons and holes. The removal rate of SMX could reach 81.21%, which was 1.37 times higher than that of TiO2/pBC(300). Three common anions (SO42-, Cl-, NO3-) existing in the Yellow River exhibited detrimental effects on the SMX photodegradation to a certain degree. It might mainly occurred hydroxylation, cleavage of SN bond and opening of isoxazole ring reactions during the photodegradation process of SMX. Meanwhile, there might be four main degradation pathways proposed throw the LC/MS/MS analysis. Finally, good reusability and stability illustrated Zn-TiO2/pBC owned good practicality and feasibility for removal of organic pollutants in environment remediation area.
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Affiliation(s)
- Xiaoyun Xie
- College of Earth and Environmental Sciences, Lanzhou University, Lanzhou 730000, China
| | - Shan Li
- College of Earth and Environmental Sciences, Lanzhou University, Lanzhou 730000, China
| | - Hanyu Zhang
- College of Earth and Environmental Sciences, Lanzhou University, Lanzhou 730000, China
| | - Zhaowei Wang
- College of Earth and Environmental Sciences, Lanzhou University, Lanzhou 730000, China.
| | - Hong Huang
- College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, China
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Li C, Rao Y, Zhang B, Huang K, Cao X, Peng D, Wu J, Xiao L, Huang Y. Extraordinary catalysis induced by titanium foil cathode plasma for degradation of water pollutant. CHEMOSPHERE 2019; 214:341-348. [PMID: 30267907 DOI: 10.1016/j.chemosphere.2018.09.138] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/27/2018] [Revised: 09/21/2018] [Accepted: 09/22/2018] [Indexed: 06/08/2023]
Abstract
The present paper reports a rapid and cost-effective bifunctional approach to the degradation of organic pollutants in the aqueous solution. This in situ hybrid induced photocatalytic method involves the advanced oxidation process, and photocatalytic process induced by ultraviolet radiated from the plasma discharge to improve the degradation efficiency. This powerful plasma allows the organic molecules to be cleaved either in the plasma zone or on the plasma/solution interface through hydrogen abstraction and electron transfer. Four parallel metal foil electrodes (i.e. Ta, Cu, Ti and Au coated Ti), used as cathodes in the two-electrode system, were evaluated in terms of their degradable performance to organic pollutants. It was found that the degradation rates are dependent on the electrical conduction of metal cathodes. During the discharge process, the Ti-based foil produces TiO2 particles, which then act as catalyst in the electrolyte and perform the photocatalytic process along with the plasma discharge process to degrade organic pollutants. It is of particular interest that gold nanoparticles, generated from Au coated Ti foil film during electrode discharging, are less than 5 nm in size and further enhance the TiO2 photocatalytic activity. In fact, this bifunctional plasma discharge process to the degradation of water pollutant provides an insight into more applications such as chemical conversion, water purification and dust pollution.
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Affiliation(s)
- Chaojiang Li
- College of Science, Hubei University of Technology, Hongshan District, Wuhan, 430068, China; School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, 639798, Singapore; Department of Materials Science and Engineering, National University of Singapore, 9 Engineering Drive 1, 117576, Singapore
| | - Yuhan Rao
- School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, 639798, Singapore
| | - Bowei Zhang
- School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, 639798, Singapore.
| | - Kang Huang
- Division of Chemistry and Biological Chemistry, Nanyang Technological University, 50 Nanyang Avenue, 639798, Singapore
| | - Xun Cao
- School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, 639798, Singapore
| | - Dongdong Peng
- School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, 639798, Singapore
| | - Junsheng Wu
- Institute of Advanced Materials and Technology, University of Science and Technology Beijing, Beijing, 100083, China.
| | - Longqiang Xiao
- Division of Chemistry and Biological Chemistry, Nanyang Technological University, 50 Nanyang Avenue, 639798, Singapore
| | - Yizhong Huang
- College of Science, Hubei University of Technology, Hongshan District, Wuhan, 430068, China; School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, 639798, Singapore.
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TiO₂ Modification with Transition Metallic Species (Cr, Co, Ni, and Cu) for Photocatalytic Abatement of Acetic Acid in Liquid Phase and Propene in Gas Phase. MATERIALS 2018; 12:ma12010040. [PMID: 30583575 PMCID: PMC6337716 DOI: 10.3390/ma12010040] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/16/2018] [Revised: 12/14/2018] [Accepted: 12/19/2018] [Indexed: 11/24/2022]
Abstract
The commercial P25 titania has been modified with transition metallic species (Cr, Co, Ni, and Cu), added by impregnation with aqueous solutions of the corresponding nitrates. The preparation procedure also includes a heat treatment (500 °C) in argon to decompose the nitrates, remove impurities and to strengthen the metal–TiO2 interaction. The catalysts have been thoroughly characterized using N2 adsorption, scanning electron microscopy (SEM), X-ray diffraction (XRD), UV-visible diffuse-reflectance spectroscopy (UV-vis DRS) and X-ray photoelectron spectroscopy (XPS), and have been tested in the aqueous phase decomposition of acetic acid and in the gas phase oxidation of propene, using an irradiation source of 365 nm in both cases. The photocatalytic activity of the four metal-containing catalysts varies with the nature of the metallic species and follows a similar trend in the two tested reactions. The effect of the nature of the added metallic species is mainly based on the electrochemical properties of the supported species, being Cu/P25 (the sample that contains copper) the best performing catalyst. In the photodecomposition of acetic acid, all the metal-containing samples are more active than bare P25, while in the gas phase oxidation of propene, bare P25 is more active. This has been explained considering that the rate-determining steps are different in gas and liquid media.
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21
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Physicochemical study of adsorption and photodegradation processes of methylene blue on copper-doped TiO2 films. J Photochem Photobiol A Chem 2018. [DOI: 10.1016/j.jphotochem.2018.04.022] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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22
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Liu R, Zhang Y. Mechanism of UV-driven Photoelectrocatalytic Degradation of Berberine Chloride Form Using the ESR Spin-trapping Method. Photochem Photobiol 2018; 94:650-658. [PMID: 29437228 DOI: 10.1111/php.12907] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2017] [Accepted: 01/26/2018] [Indexed: 01/01/2023]
Abstract
Photoelectrocatalytic (PEC) system greatly improves the migration of photoexcited charges, retards the fast recombination of electron-hole and increases the lifetime of photogenerated holes. In this article, we constructed a novel PEC system to degrade berberine chloride form (BCF). XRD patterns indicated aging time was an important condition for the crystal type of TiO2, and the best proportion of anatase/rutile was 80/20. The band gap energy of the TiO2 was 3.01 eV. We demonstrated that a synergistic effect existed between photocatalysis (PC) and electrocatalysis (EC). Besides, we discussed the influence of pH, current density, the amount of catalyst and initial BCF concentration on the degradation of BCF. Electron spin resonance (ESR) through spin trap 5, 5-dimethyl-1-pyrroline-N-oxide (DMPO) and the scavenging experiments suggested that the reactive oxygen species (ROS) were superoxide radicals (O2·-), hydroxyl radicals (·OH) and sulfate radical (SO4·-) in PEC system. Furthermore, we compared the two pathway of formation DMPO-SO4 adducts and found that SO4·- was the most major oxidized species in degrading BCF. We proposed a plausible reaction mechanism. Intriguingly, even under lower current and weaker light conditions, the PEC process maintained its effectiveness, demonstrating the feasibility of the PEC approach.
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Affiliation(s)
- Rong Liu
- State Key Laboratory of Hollow Fiber Membrane Materials and Processes, School of Environmental and Chemical Engineering, Tianjin Polytechnic University, Tianjin, China
| | - Yonggang Zhang
- State Key Laboratory of Hollow Fiber Membrane Materials and Processes, School of Environmental and Chemical Engineering, Tianjin Polytechnic University, Tianjin, China
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