13558-31-1Relevant articles and documents
Photocatalysis through Excitation of Adsorbates. 3. Effect of Electron Acceptors on the Efficiency of Interfacial Charge Separation
Takizawa, Takuo,Watanabe, Tadashi,Honda, Kenichi
, p. 51 - 55 (1980)
Charge separation in photoexcited rhodamine B-CdS-electron acceptor systems was investigated photochemically and photoelectrochemically, by using acceptors with different standard reduction potentials (E0red.).The formal quantum efficiency (FQE) of N-deethylation of the dye after photoinduced electron injection into CdS (in photochemical suspension systems) and sensitized photocurrents flowing through a single-crystal CdS membrane separating the dye from an acceptor (in photoelectrochemical systems) were measured as a function of concentration of acceptors.Both FQE and sensitized photocurrents reflect the efficiency of charge separation between the dye and acceptors.Results indicate that charge separation occurs only in the presence of CdS and its efficiency rises as E0red. of the acceptor is more positive.The effectiveness of the present systems for photoinduced charge separation is discussed.
The upconversion and enhanced visible light photocatalytic activity of Er3+-doped tetragonal BiVO4
Yang, Wei,Tan, Guoqiang,Ren, Huijun,Zhang, Lili,Zhao, Chengcheng,Xia, Ao
, p. 7324 - 7329 (2015)
Er3+-doped BiVO4 with tetragonal structure is prepared by the microwave hydrothermal method. X-ray diffraction and Rietveld refinement demonstrate that the structure is transformed from the monoclinic (C2/c:c3) phase to the tetragonal (I41/amd:2) phase by doping with Er3+ ions. Er3+ doping also influences the morphology change of BiVO4 from irregular flake-like crystal to rod-like crystal, which leads to the increase of the surface areas from 3.25 to 11.96 m2 g-1. Compared with the monoclinic BiVO4, the upconversion of the Er3+-doped tetragonal BiVO4 occurs through the transitions from the 4I15/2 ground state to 4F7/2, 2H11/2, and 4F9/2 states, respectively. The photocatalytic experiment indicates that the tetragonal BiVO4 (8 at.%) with a larger specific surface area (9.88 m2 g-1) shows the best photocatalytic activity under visible light irradiation, which can efficiently improve the degradation rate of RhB up to 97.2% at 150 min. This journal is
Visible light photodegradation of rhodamine B over VDF/CTFE copolymer-templated crystalline mesoporous titania
Zi, Guoli,Wang, Yi,Zheng, Kai,Zhao, Huan,Wang, Fuzhi,Zhang, Wenjun,Yan, Zhiying,He, Jiao,Wang, Jiaqiang
, p. 2383 - 2391 (2012)
Mesoporous TiO2 with anatase crystalline structure (MTiO 2/F2319) has been synthesized by using vinylidene fluoride/chlorotrifluoroethylene copolymer (1:9 in mole, F2319) as template. The synthesized mesoporous titania samples were characterized by a combination of various physicochemical techniques, such as X-ray diffraction, scanning electron microscopy, high-resolution transmission electron microscopy, and N2 adsorption/desorption. It was found that without any external doping, MTiO2/F2319 exhibited significantly higher photocatalytic activities for the degradation of rhodamine B (RhB) dye than P25 TiO2 under visible light irradiation. Furthermore, the UV-Vis absorption maximum of the dye solution exhibited a gradual hypsochromic shift due to de-ethylation and degradation of RhB dye. Springer Science+Business Media B.V. 2012.
New latent fluorophore for DT diaphorase
Huang, Sheng-Tung,Lin, Yuh-Ling
, p. 265 - 268 (2006)
This study describes the design and synthesis of a novel latent fluorophore 3 for DT diaphorase based on the trimethyl lock effect and characterization of its enzymatic kinetics. Fluorophore 3 is also a sensitive fluorimetric reagent for detecting glucose when coupled with DTD and glucose dehydrogenase.
A novel synthetic route for magnetically retrievable Bi2WO 6 hierarchical microspheres with enhanced visible photocatalytic performance
Liu, Zhi,Chen, Feitai,Gao, Yuanpeng,Liu, Yang,Fang, Pengfei,Wang, Shaojie
, p. 7027 - 7030 (2013)
We report a reliable and effective strategy to synthesize magnetically recyclable Bi2WO6 microspheres using Fe3O 4 nanoparticles as supports. The as-prepared hierarchical photocatalyst displays excellent photocatalytic activity and reusability under visible light irradiation. The Royal Society of Chemistry 2013.
Tandem photocatalytic oxidation of Rhodamine B over surface fluorinated bismuth vanadate crystals
Liu, Shengwei,Yin, Kai,Ren, Wanshu,Cheng, Bei,Yu, Jiaguo
, p. 17759 - 17767 (2012)
BiVO4 crystals with monoclinic-phase and controllable morphologies were synthesized by NaF-mediated hydrothermal processes using Bi(NO3)3 and V2O5 as precursors. The NaF added as a structural controller not only affected the crystal evolution processes of BiVO4 crystals, but also enabled the in situ surface fluorination of the as-synthesized BiVO4 crystals. Interestingly, the photocatalytic oxidation reactions of RhB occurred in a stepwise manner over fluorinated BiVO4 photocatalyst, that is, a faster de-ethylation process (conversion of RhB into rhodamine) followed by a relatively slower mineralization process, involving the destruction of the conjugated structure in rhodamine. Surface fluorination favored the RhB adsorption and hole transfer between RhB molecules and BiVO4 photocatalyst, thus progressively enhancing the initial direct hole transfer mediated de-ethylation process. In contrast, surface fluorination exerts compromised effects on the ·O 2- mediated mineralization process, enhancing surface RhB adsorption versus retarding electron transfer from BiVO4 photocatalyst to O2 giving rise to ·O2-, and consequently, moderate surface fluorine coverage is required to balance the aforementioned conflicting effects and achieve the higher mineralization rate. The present study not only demonstrates that the photocatalytic efficiency can be modified by tuning photogenerated active species and photocatalytic reaction processes, but also provides new insights into the fluorination effects on the semiconductor photocatalysis.
Piezocatalytic performance of Na0.5Bi0.5TiO3 nanoparticles for degradation of organic pollutants
Chen, Lirong,Hao, Xihong,Li, Yong,Lu, Chunxiao,Shi, Lu,Zhang, Qiwei,Zhang, Tiejun
, (2021/11/16)
Piezocatalysis has been considered as a promising technology in water pollution treatment. In this work, a series of piezoelectric Na0.5Bi0.5TiO3 (NBT) nanoparticles were prepared by hydrothermal method using different titanium sources as titanium precursors. The piezocatalytic performances of the NBT nanoparticles were investigated by the degradation of Rhodamine B (RhB) with the concentration of 10 mg/L under ultrasonic vibration. It is found that the NBT nanoparticles prepared by using anatase titanium oxide as titanium precursor show optimum piezocatalytic activity and the rate constant of 0.022 min?1 is achieved for RhB. The initial RhB concentration, ultrasonic power, particles size and specific surface area of NBT materials play an important role in optimizing the piezocatalytic performance. Moreover, the NBT nanoparticles show a satisfactory stability and reusability for the piezocatalytic degradation. The piezocatalytic mechanism of NBT nanoparticles was elucidated by the identification of free radicals and intermediates in the degradation process. The work provides a guidance to design and develop new high-performance piezocatalysts.
