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Synthesis of Reduced Graphene Oxide/Copper Tin Sulfide (Cu2SnS3) Composite for the Photocatalytic Degradation of Tetracycline. J Inorg Organomet Polym Mater 2022. [DOI: 10.1007/s10904-022-02308-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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2
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Critical analysis of various supporting mediums employed for the incapacitation of silver nanomaterial for aniline and phenolic pollutants: A review. KOREAN J CHEM ENG 2021. [DOI: 10.1007/s11814-017-0192-0] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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3
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Boosting the photocatalytic ability of hybrid biVO4-TiO2 heterostructure nanocomposites for H2 production by reduced graphene oxide (rGO). J Taiwan Inst Chem Eng 2020. [DOI: 10.1016/j.jtice.2020.04.001] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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4
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Xue J, Li J, Bi Q, Tang C, Zhang L, Leng Z. Yb-substitution triggered BiVO4-Bi2O3 heterojunction electrode for photoelectrocatalytic degradation of organics. Colloids Surf A Physicochem Eng Asp 2020. [DOI: 10.1016/j.colsurfa.2020.124640] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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5
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Barkaat S, Zuber M, Zia KM, Noreen A, Tabasum S. UV/H 2O 2/Ferrioxalate Based Integrated Approach to Decolorize and Mineralize Reactive Blue Dye: Optimization Through Response Surface Methodology. Z PHYS CHEM 2019. [DOI: 10.1515/zpch-2019-1388] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
Abstract
The decolorization and mineralization of Reactive Blue 222 dye was studied using UV/H2O2/ferrioxalate approach in combination with Pleorotus ostreatus. The dye was decolorized by UV/H2O2/ferrioxalate based advanced oxidation process (AOP) at different levels of process variables dye concentration, catalyst dose, pH, reaction time and resultantly, 80% decolorization was achieved. Pleorotus ostreatus treatment enhanced the dye degradation up to 92% at optimum levels of pH, temperature, inoculum size, carbon and nitrogen sources at specific concentration. Response Surface Methodology (RSM) was employed for optimization under face-centered central composite design (CCD). Although both treatments were found efficient for the removal of dye, but on applying the integrated approach, 96% dye removal was obtained which led to complete degradation of the dye. FTIR analysis confirmed the degradation of dye into low mass compounds. The water quality assurance parameters were measured to assess the mineralization efficiency. A significant reduction in COD (94%) and TOC (92%) were found when dye was degraded integrated approach. A phytotoxicity analysis on Pisum sativum plant revealed the non-toxic behavior of metabolites produced. Results revealed that the integrated approach is highly promising for the decolorization and mineralization of the Reactive Blue 222 dye and is also extendable to treat the dye in textile wastewater.
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Affiliation(s)
- Samra Barkaat
- Department of Applied Chemistry , Government College University Faisalabad , Faisalabad , Pakistan
| | - Muhammad Zuber
- Department of Applied Chemistry , Government College University Faisalabad , Faisalabad , Pakistan
- Department of Chemistry , The University of Lahore , Lahore , Pakistan
| | - Khalid Mahmood Zia
- Department of Applied Chemistry , Government College University Faisalabad , Faisalabad , Pakistan
| | - Aqdas Noreen
- Department of Applied Chemistry , Government College University Faisalabad , Faisalabad , Pakistan
| | - Shazia Tabasum
- Department of Applied Chemistry , Government College University Faisalabad , Faisalabad , Pakistan
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6
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Douda J, González Vargas CR, Basiuk EV, Díaz Cano AI, Fuentes García JA, Hernández Contreras XA. Optical properties of amine-functionalized graphene oxide. APPLIED NANOSCIENCE 2019. [DOI: 10.1007/s13204-019-00956-z] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
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7
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Wang Y, Yan H, Zhang Q. Graphene–Magnetic Spinel Ferrite Nanocomposite: Facile Synthesis and Excellent Photocatalytic Performance. Aust J Chem 2019. [DOI: 10.1071/ch18432] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
Spinel ferrite structured ZnFe2O4 nanoparticles anchored on reduced graphene oxide (rGO) sheets have been prepared via a facile hydrothermal method combined with a solvothermal approach. For the synthesis of the ZnFe2O4/rGO nanocomposites, the rGO nanosheet contains epoxy functional groups serving as the active sites, which allowed the formation of uniform ZnFe2O4 nanoparticles. Due to the structure of the ZnFe2O4/RGO nanocomposites, the aggregation of the ZnFe2O4 nanoparticles can be readily disrupted and electronic transfer through the rGO nanosheets is accelerated. This could in turn enhance the photocatalytic efficiency. It was also demonstrated that ZnFe2O4/rGO (40 wt-%) hybrid nanocomposites almost reached adsorption equilibrium in the RhB dye within 60min. The Langmuir equation model showed that the photodegradation of RhB was well fitted to first order reaction kinetics with k=0.6254min−1. This illustrated that the addition of GO could reduce the bandgap of pure ZnFe2O4, which avoided the combination of electrons and holes. The ZnFe2O4/rGO nanocomposites could also enhance the utilisation of sunlight. In addition, the ZnFe2O4/rGO nanocomposite photocatalyst also demonstrated a supramagnetic property, holding potential to be utilised for water treatment.
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8
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Choi DS, Kim C, Lim J, Cho SH, Lee GY, Lee HJ, Choi JW, Kim H, Kim ID, Kim SO. Ultrastable Graphene-Encapsulated 3 nm Nanoparticles by In Situ Chemical Vapor Deposition. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2018; 30:e1805023. [PMID: 30318636 DOI: 10.1002/adma.201805023] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/02/2018] [Revised: 09/19/2018] [Indexed: 06/08/2023]
Abstract
Nanoscale materials offer enormous opportunities for catalysis, sensing, energy storage, and so on, along with their superior surface activity and extremely large surface area. Unfortunately, their strong reactivity causes severe degradation and oxidation even under ambient conditions and thereby deteriorates long-term usability. Here superlative stable graphene-encapsulated nanoparticles with a narrow diameter distribution prepared via in situ chemical vapor deposition (CVD) are presented. The judiciously designed CVD protocol generates 3 nm size metal and ceramic nanoparticles intimately encapsulated by few-layer graphene shells. Significantly, graphene-encapsulated Co3 O4 nanoparticles exhibit outstanding structural and functional integrity over 2000 cycles of lithiation/delithiation for Li-ion battery anode application, accompanied by 200% reversible volume change of the inner core particles. The insight obtained from this approach offers guidance for utilizing high-capacity electrode materials for Li-ion batteries. Furthermore, this in situ CVD synthesis is compatible with many different metal precursors and postsynthetic treatments, including oxidation, phosphidation, and sulfidation, and thus offers a versatile platform for reliable high-performance catalysis and energy storage/conversion with nanomaterials.
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Affiliation(s)
- Dong Sung Choi
- National Creative Research Initiative Center for Multi-Dimensional Directed Nanoscale Assembly, Department of Materials Science and Engineering, KAIST, Daejeon, 34141, Republic of Korea
| | - Chanhoon Kim
- Department of Materials Science and Engineering, KAIST, Daejeon, 34141, Republic of Korea
| | - Joonwon Lim
- National Creative Research Initiative Center for Multi-Dimensional Directed Nanoscale Assembly, Department of Materials Science and Engineering, KAIST, Daejeon, 34141, Republic of Korea
| | - Su-Ho Cho
- Department of Materials Science and Engineering, KAIST, Daejeon, 34141, Republic of Korea
| | - Gil Yong Lee
- National Creative Research Initiative Center for Multi-Dimensional Directed Nanoscale Assembly, Department of Materials Science and Engineering, KAIST, Daejeon, 34141, Republic of Korea
| | - Ho Jin Lee
- National Creative Research Initiative Center for Multi-Dimensional Directed Nanoscale Assembly, Department of Materials Science and Engineering, KAIST, Daejeon, 34141, Republic of Korea
| | - Jang Wook Choi
- School of Chemical and Biological Engineering and Institute of Chemical Processes, Seoul National University, Seoul, 08826, Republic of Korea
| | - Heeyeon Kim
- Energy Materials Laboratory, KIER, Daejeon, 34129, Republic of Korea
| | - Il-Doo Kim
- Department of Materials Science and Engineering, KAIST, Daejeon, 34141, Republic of Korea
| | - Sang Ouk Kim
- National Creative Research Initiative Center for Multi-Dimensional Directed Nanoscale Assembly, Department of Materials Science and Engineering, KAIST, Daejeon, 34141, Republic of Korea
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9
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Facile Fabrication of Dumbbell-Like β-Bi₂O₃/Graphene Nanocomposites and Their Highly Efficient Photocatalytic Activity. MATERIALS 2018; 11:ma11081359. [PMID: 30082601 PMCID: PMC6119887 DOI: 10.3390/ma11081359] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/10/2018] [Revised: 08/03/2018] [Accepted: 08/03/2018] [Indexed: 11/23/2022]
Abstract
β-Bi2O3 decorated graphene nanosheets (β-Bi2O3/GN) were prepared by a facile solution mixing method. The crystal structure, surface morphology, and photo absorbance properties of the products were characterized by XRD, SEM, and UV-VIS diffuse reflection, respectively. Moreover, the effect of graphene content on photocatalytic activity was systematically investigated, and the results indicated that these composites possessed a high degradation rate of Rhodamine B (RhB), which was three times higher than that of bare β-Bi2O3 when graphene content was 1 wt %. This high photocatalytic activity was attributed predominantly to the presence of graphene, which served as an electron collector and transporter to efficiently lengthen the lifetime of the photogenerated charge carriers from β-Bi2O3.
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10
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Zhang C, Du Z, Zhou R, Xu P, Dong X, Fu Y, Wang Q, Su C, Yan L, Gu Z. Cu 2(OH)PO 4/reduced graphene oxide nanocomposites for enhanced photocatalytic degradation of 2,4-dichlorophenol under infrared light irradiation. RSC Adv 2018; 8:3611-3618. [PMID: 35542932 PMCID: PMC9077714 DOI: 10.1039/c7ra12684k] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2017] [Accepted: 01/05/2018] [Indexed: 11/30/2022] Open
Abstract
Sparked by the growing environmental crises, photocatalytic degradation of chlorophenols with inexhaustible solar energy is expected to be converted into actual applications. Here, we report the preparation of the nanocomposite of Cu2(OH)PO4 and reduced graphene oxide (Cu2(OH)PO4/rGO) through a one-step hydrothermal method and examined its infrared-light photocatalytic activity in the degradation of 2,4-dichlorophenol (2,4-DCP). As evidenced by the absorption spectra and the degradation of 2,4-DCP, Cu2(OH)PO4/rGO exhibited enhanced infrared light-driven photocatalytic activity compared to pure Cu2(OH)PO4 and was very stable even after repeated cycling. More importantly, the introduction of hydrogen peroxide (H2O2) could combine the photocatalytic and photo-Fenton effects into one reaction system and maximize the infrared light photocatalytic efficiency. Typically, the rate constant of Cu2(OH)PO4/rGO and H2O2 was more than 6.25 times higher than that of only Cu2(OH)PO4/rGO, and almost 10 times greater than the value for pure Cu2(OH)PO4. Further, a plausible mechanism for the enhanced photocatalytic properties of Cu2(OH)PO4/rGO has been discussed. These findings may help the development of novel hybrid photocatalysts with enhanced infrared light photocatalytic activity for applications in the treatment of chlorophenol-contaminated wastewater.
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Affiliation(s)
- Chenyang Zhang
- College of Mechanical and Electronic Engineering, Shandong University of Science and Technology Qingdao 266590 P. R. China
- CAS Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety, Institute of High Energy Physics, Chinese Academy of Sciences Beijing 100049 P. R. China
| | - Zhen Du
- CAS Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety, Institute of High Energy Physics, Chinese Academy of Sciences Beijing 100049 P. R. China
| | - Ruyi Zhou
- CAS Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety, Institute of High Energy Physics, Chinese Academy of Sciences Beijing 100049 P. R. China
| | - Peng Xu
- CAS Key Laboratory of Standardization and Measurement for Nanotechnology, National Center for Nanoscience and Technology Beijing 100190 P. R. China
| | - Xinghua Dong
- CAS Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety, Institute of High Energy Physics, Chinese Academy of Sciences Beijing 100049 P. R. China
- University of Chinese Academy of Sciences Beijing 101408 P. R. China
| | - Yanyan Fu
- State Key Lab of Transducer Technology, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences Changning Road 865 Shanghai 200050 P. R. China
| | - Qing Wang
- School of Material Science and Engineering, Shandong University of Science and Technology Qingdao 266590 P. R. China
| | - Chunjian Su
- College of Mechanical and Electronic Engineering, Shandong University of Science and Technology Qingdao 266590 P. R. China
| | - Liang Yan
- CAS Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety, Institute of High Energy Physics, Chinese Academy of Sciences Beijing 100049 P. R. China
- University of Chinese Academy of Sciences Beijing 101408 P. R. China
| | - Zhanjun Gu
- CAS Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety, Institute of High Energy Physics, Chinese Academy of Sciences Beijing 100049 P. R. China
- University of Chinese Academy of Sciences Beijing 101408 P. R. China
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11
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12
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Xiang N, Huang J, Zhao H, Liu C, Liu X. A Green Approach to the Synthesis of Reduced Graphene Oxide using Sodium Humate. ACTA ACUST UNITED AC 2016. [DOI: 10.1515/zpch-2016-0762] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
A green and simple chemistry approach was demonstrated to prepare reduced graphene oxide (rGO) using sodium humate (SH) as the reducing agent. Without using toxic and harmful chemicals, this method is environmentally friendly and suitable for the large-scale production of graphene. At first, the improved Hummers method to oxidize graphite for the synthesis of graphene oxide (GO) was applied, and then the as-prepared GO was reduced by SH to form rGO. Characterization was performed using Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), scanning electron microscope (SEM), energy dispersive X-ray spectroscopy (EDX), X-ray photoelectron spectrometry (XPS) and Raman spectra. The intensity ratio of the D and G band (ID/IG) of GO after reduction with SH increases from 0.96 (GO) to 1.11 (rGO), the results obtained from the Raman spectra proved high purity of the final products.
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Affiliation(s)
- Ning Xiang
- Key Laboratory of Groundwater Resources and Environment, Ministry of Education, Jilin University, Changchun 130021, P.R. China
| | - Jiguo Huang
- Key Laboratory of Groundwater Resources and Environment, Ministry of Education, Jilin University, Changchun 130021, P.R. China
| | - Honggang Zhao
- Xinjiang Normal University, Urumqi 830054, P.R. China
| | - Chengjia Liu
- Key Laboratory of Groundwater Resources and Environment, Ministry of Education, Jilin University, Changchun 130021, P.R. China
| | - Xingjuan Liu
- Key Laboratory of Groundwater Resources and Environment, Ministry of Education, Jilin University, Changchun 130021, P.R. China
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13
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Fu Q, Wang X, Li C, Sui Y, Han Y, Lv Z, Song B, Xu P. Enhanced photocatalytic activity on polarized ferroelectric KNbO3. RSC Adv 2016. [DOI: 10.1039/c6ra23344a] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
In this paper, we demonstrate the enhanced photodegradation of rhodamine B on polarized ferroelectric KNbO3 (KNO) particles.
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Affiliation(s)
- Qiang Fu
- Department of Physics
- Harbin Institute of Technology
- Harbin 150001
- China
- Department of Physics
| | - Xianjie Wang
- Department of Physics
- Harbin Institute of Technology
- Harbin 150001
- China
| | - Changyu Li
- Material Science and Engineering College
- Northeast Forestry University
- Harbin 150040
- China
| | - Yu Sui
- Department of Physics
- Harbin Institute of Technology
- Harbin 150001
- China
| | - Yaping Han
- Department of Physics
- Northeast Forestry University
- Harbin 150040
- China
| | - Zhe Lv
- Department of Physics
- Harbin Institute of Technology
- Harbin 150001
- China
| | - Bo Song
- Department of Physics
- Harbin Institute of Technology
- Harbin 150001
- China
- Academy of Fundamental and Interdisciplinary Sciences
| | - Ping Xu
- School of Chemistry and Chemical Engineering
- Harbin Institute of Technology
- Harbin 150001
- China
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14
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Khairy M, Mohamed MM. SnO₂(β-Bi₂O₃)/Bi₂Sn₂O₇ nanohybrids doped with Pt and Pd nanoparticles: applications in visible light photocatalysis, electrical conductivity and dye-sensitized solar cells. Phys Chem Chem Phys 2015; 17:21716-28. [PMID: 26234250 DOI: 10.1039/c5cp02066b] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Bi2O3-SnO2 nanocomposites formed at a nominal molar ratio of 3 : 1 and loaded with Pd/Pt nanoparticles synthesized by a sol gel-hydrothermal method with the aid of a template were thoroughly characterized by X-ray diffraction, TEM-EDX, N2 sorptiometry, diffuse reflectance UV-Vis, FTIR, photoluminescence and electrical conductivity. It has been shown that Pd and Pt stimulate the existence of β-Bi2O3 and SnO2, respectively together with the key component Bi2Sn2O7. The photocatalytic results indicate that Pd/β-Bi2O3-Bi2Sn2O7 revealed a remarkable performance for the degradation of methylene blue (MB) dye as compared to the Pt/SnO2-Bi2Sn2O7 and Bi2O3-SnO2 samples in both the UV and visible regions. The enhanced photocatalytic activity of the Pd/β-Bi2O3-Bi2Sn2O7 nanocomposite is primarily attributed to the broad contact between the β-Bi2O3 and Bi2Sn2O7 phases, which indicates high mesoporosity and heterojunction structures resulting in separation efficacy between photo-induced electron-hole pairs. Specifically, the photosensitive β-Bi2O3 is easily excited and released electrons to be accepted by Bi2Sn2O7 and Pd that might be deposited in the interlayer between β-Bi2O3 and Bi2Sn2O7. The degradation mechanism of MB over Pd/β-Bi2O3-Bi2Sn2O7 in the visible region showed that the dye degradation proceeds through evolution of ˙O2(-) and ˙OH radicals as evaluated using photoluminescence and free radical trapping experiments. An insight into the electrical properties including the dielectric constant and impedance of the materials indicates that Pd/β-Bi2O3-Bi2Sn2O7 has the highest conductivity based on increasing the ionic transport and defects at the β-Bi2O3/Bi2Sn2O7 heterojunction. This material displayed an improved photocurrent response of a higher power conversion efficiency, exceeding that of Pt/SnO2-Bi2Sn2O7 and SnBi3 by 50% and 250%, respectively, in dye-sensitized solar cells. Picosecond-resolved photoluminescence (PL) and polarization gated PL anisotropy measurements were combined to clarify the process of FRET from the excited Pd/β-Bi2O3-Bi2Sn2O7 to SD N719. This indicates that the latter structure can be proposed as a multifunctional candidate for use in dye-sensitized solar cells, as an electrical material and as an efficient photocatalyst based on its versatile structure.
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Affiliation(s)
- M Khairy
- Chemistry Department, Faculty of Science, Benha University, Benha, Egypt.
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15
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Li ZX, Ma CY, Chen WB, Ou-Yang ZJ, Feng WJ, Dong W. Photoluminescence and labelling for microcrack bone of N-salicylidene-3-amino-1,2,4-triazole. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2015; 136 Pt C:1982-1987. [PMID: 25468441 DOI: 10.1016/j.saa.2014.10.121] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/21/2014] [Revised: 10/26/2014] [Accepted: 10/29/2014] [Indexed: 06/04/2023]
Abstract
A new Schiff base of N-salicylidene-3-amino-1,2,4-triazole (SAT) was synthesized and its photoluminescent, photochromic and thermochromic properties were characterized and demonstrated. The fluorescence lifetime and quantum yield of SAT were measured and the microcrack bone imaging using SAT as a fluorescent label was observed by laser scanning confocal microscope (LSCM). The absorption spectrum of SAT was demonstrated using DFT/TD-DFT calculation.
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Affiliation(s)
- Zhi-Xin Li
- School of Chemistry and Chemical Engineering, Guangzhou Key Laboratory for Environmentally Functional Materials and Technology, Guangzhou University, Guangzhou 510006, China
| | - Chang-Yan Ma
- School of Chemistry and Chemical Engineering, Guangzhou Key Laboratory for Environmentally Functional Materials and Technology, Guangzhou University, Guangzhou 510006, China
| | - Wen-Bin Chen
- School of Chemistry and Chemical Engineering, Guangzhou Key Laboratory for Environmentally Functional Materials and Technology, Guangzhou University, Guangzhou 510006, China
| | - Zhi-Jian Ou-Yang
- School of Chemistry and Chemical Engineering, Guangzhou Key Laboratory for Environmentally Functional Materials and Technology, Guangzhou University, Guangzhou 510006, China
| | - Wei-Jin Feng
- School of Chemistry and Chemical Engineering, Guangzhou Key Laboratory for Environmentally Functional Materials and Technology, Guangzhou University, Guangzhou 510006, China
| | - Wen Dong
- School of Chemistry and Chemical Engineering, Guangzhou Key Laboratory for Environmentally Functional Materials and Technology, Guangzhou University, Guangzhou 510006, China.
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16
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Zhong S, Zhang F, Lu W, Wang T, Qu L. One-step synthesis of Bi2WO6/Bi2O3 loaded reduced graphene oxide multicomponent composite with enhanced visible-light photocatalytic activity. RSC Adv 2015. [DOI: 10.1039/c5ra08538a] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Schematic diagram of charge separation in visible-light irradiation and the energy band mechanism of enhanced photocatalytic activity of BWO@R.
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Affiliation(s)
- Shuang Zhong
- Key Laboratory of Groundwater Resources and Environment
- Ministry of Education
- Jilin University
- Changchun 130026
- China
| | - Fengjun Zhang
- Key Laboratory of Groundwater Resources and Environment
- Ministry of Education
- Jilin University
- Changchun 130026
- China
| | - Wei Lu
- Key Laboratory of Groundwater Resources and Environment
- Ministry of Education
- Jilin University
- Changchun 130026
- China
| | - Tianye Wang
- Key Laboratory of Groundwater Resources and Environment
- Ministry of Education
- Jilin University
- Changchun 130026
- China
| | - Liyuan Qu
- Key Laboratory of Groundwater Resources and Environment
- Ministry of Education
- Jilin University
- Changchun 130026
- China
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17
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Gupta S, Subramanian VR. Encapsulating Bi2Ti2O7 (BTO) with reduced graphene oxide (RGO): an effective strategy to enhance photocatalytic and photoelectrocatalytic activity of BTO. ACS APPLIED MATERIALS & INTERFACES 2014; 6:18597-18608. [PMID: 25082783 DOI: 10.1021/am503396r] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Multimetal oxides (AxByOz) offer a higher degree of freedom compared to single metal oxides (AOx) in that these oxides facilitate (i) designing nanomaterials with greater stability, (ii) tuning of the optical bandgap, and (iii) promoting visible light absorption. However, all AxByOz materials such as pyrochlores (A2B2O7)--referred to here as band-gap engineered composite oxide nanomaterials or BECONs--are traditionally prone to severe charge recombination at their surface. To alleviate the charge recombination, an effective strategy is to employ reduced graphene oxide (RGO) as a charge separator. The BECON and the RGO with oppositely charged functional groups attached to them can be integrated at the interface by employing a simple electrostatic self-assembly approach. As a case study, the approach is demonstrated using the Pt-free pyrochlore bismuth titanate (BTO) with RGO, and the application of the composite is investigated for the first time. When tested as a photocatalyst toward hydrogen production, an increase of ∼ 250% using BTO in the presence of RGO was observed. Further, photoelectrochemical measurements indicate an enhancement of ∼ 130% in the photocurrent with RGO inclusion. These two results firmly establish the viability of the electrostatic approach and the inclusion of RGO. The merits of the RGO addition is identified as (i) the RGO-assisted improvement in the separation of the photogenerated charges of BTO, (ii) the enhanced utilization of the charges in a photocatalytic process, and (iii) the maintenance of the BTO/RGO structural integrity after repeated use (established through reusability analysis). The success of the self-assembly strategy presented here lays the foundation for developing other forms of BECONs, belonging to perovskites (ABO3), sillenite (A12BO20), or delafossite (ABO2) groups, hitherto written off due to limited or no photoelectrochemicalactivity.
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Affiliation(s)
- Satyajit Gupta
- Department of Chemical and Materials Engineering, University of Nevada , Reno, Nevada 89557, United States
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18
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Sun Z, Guo J, Zhu S, Ma J, Liao Y, Zhang D. High photocatalytic performance by engineering Bi2WO6 nanoneedles onto graphene sheets. RSC Adv 2014. [DOI: 10.1039/c4ra03533j] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023] Open
Abstract
A sonochemical method was described to engineer Bi2WO6 nanoneedles on graphene sheets, which showed improved performances both in H2 and O2 creation.
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Affiliation(s)
- Zhihua Sun
- State Key Laboratory of Metal Matrix Composites
- Shanghai Jiao Tong University
- Shanghai, P. R. China
| | - Jingjing Guo
- State Key Laboratory of Metal Matrix Composites
- Shanghai Jiao Tong University
- Shanghai, P. R. China
| | - Shenmin Zhu
- State Key Laboratory of Metal Matrix Composites
- Shanghai Jiao Tong University
- Shanghai, P. R. China
| | - Jun Ma
- School of Engineering
- University of South Australia
- SA 5095, Australia
| | - Yongliang Liao
- State Key Laboratory of Metal Matrix Composites
- Shanghai Jiao Tong University
- Shanghai, P. R. China
| | - Di Zhang
- State Key Laboratory of Metal Matrix Composites
- Shanghai Jiao Tong University
- Shanghai, P. R. China
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