ACS Sustainable Chemistry & Engineering
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2015
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IF 4.642
Fang Xu,Xiang-Ning Song,Guo-Ping Sheng,Hong-Wei Luo,Wen-Wei Li,Ri-Sheng Yao,Han-Qing Yu
The generation of hydroxyl radical (•OH) under solar irradiation from natural photosensitizers is widely recognized to play a key role in the photochemical degradation of biorefractory organic pollutants. Solar-light-mediated •OH production has been supposed as a green and sustainable strategy in water and wastewater treatment. In this study, an efficient visible-light-mediated •OH generation method using the photosensitization of vitamin B2 (VB2) catalyzed by dissolved iron was proposed. •OH generation was validated by electron paramagnetic resonance spectroscopy combined with spin trapping, and was further confirmed using the hydroxylation of nitrobenzene. VB2 plays a dual role of in the process of •OH generation. In the initial step, VB2 works as an excellent photosensitizer. Upon absorption of a photon, VB2 gives rise to its excited singlet state (1VB*) and, through intersystem crossing, to its excited triplet state (3VB*). In the subsequent step, VB2 works as an effective electron mediator to mediate O2•– generation. However, O2•– is sensitive to proton and is converted to H2O2 quickly in water. Ultimately, the •OH generation occurs through dissolved-iron catalyzed decomposition of H2O2. All ingredients involved in this process are nontoxic, environmentally benign, and easily available. Thus, this process might have potential environmental implications.
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Journal of Physical Chemistry C
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2015
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IF 4.772
Dong Yang,Yuanyuan Sun,Zhenwei Tong,Yao Tian,Yuanbing Li,Zhongyi Jiang
Inspired by the bioadhesion mechanism found in mussel, a catechol derivative, 3-(3,4-dihydroxyphenyl)propionic acid (diHPP), is employed as both linker and reducer of Ag+ to synthesize the Ag/TiO2 nanotube (Ag/TNT) heterojunction under ambient conditions in this study. In the prepared Ag/TNT composite, Ag nanocrystals about 3.8 nm in diameter distribute over the TNT surface uniformly and form the heterojunction structure with TNT. The diHPP first links to the TNT surface through the bidentate chelation of catechol group with Ti4+ and then acts as both an anchor and a reducer to in situ nucleate and grow Ag nanocrystals on the TNT surface. By adjusting the AgNO3 concentration, the loading amount of Ag nanocrystals on the TNT surface can be controlled easily, and the visible-light absorption ability of Ag/TNT heterojunctions enhances with increasing the Ag loading amount. Moreover, their photocatalytic activity was evaluated by the degradation capability of Rhodamine B (RhB) under visible light. The Ag/TNT heterojunctions exhibit the high visible-light photocatalytic activity, which can almost degrade 100% RhB within 2 h. This excellent performance can be attributed to the local electric field caused by the surface plasmon resonance (SPR) of Ag nanocrystals and the high adsorption capability of TNTs with large specific surface area.
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APPLIED SURFACE SCIENCE
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2015
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IF 2.711
Guoling Wu,Ping Li,Dongbo Xu,Bifu Luo,Yuanzhi Hong,Weidong Shi,Chunbo Liu
Visible-light-driven manganese doped SrTiO 3 nanocubes with various manganese atomic percentages in the range of 3–7%, were prepared by a hydrothermal method. These obtained photocatalysts were systematically characterized by XRD, EDX, TEM, STEM, XPS, UV–vis, PL, EIS. The results demonstrated that the Mn 4+ has substituted into the lattice of SrTiO 3 nanocubes and the absorption onset shifted toward the visible region. It is beneficial to the photocatalytic degradation of tetracycline under the visible light irradiation. Interestingly, the optimal doping atomic percentages at 5% exhibited the highest degradation rates (66.7%) in 60 min. The high photocatalytic activity could be ascribed to the Mn doping adjustment the energy band of SrTiO 3 and the highly effective separation of photo-generated electron–hole pairs. Furthermore, the possible photocatalytic mechanism has been discussed based on the active species trapping experiments and ESR analysis.
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CATALYSIS COMMUNICATIONS
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2015
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IF 3.699
Weiming Wu,Teng Teng,Xiao-Yuan Wu,Xuejing Dui,Lei Zhang,Jinhua Xiong,Ling Wu,Can-Zhong Lu
A cobalt-based polyoxometalate, Na 7 H 10 [Co 6 (H 2 O) 2 (PW 9 O 34 ) 2 (PW 6 O 26 )]·30H 2 O, was synthesized by a simple aqueous solution method. It showed catalytic activity for the visible-light-driven H 2 evolution from water splitting with eosin Y as the photosensitizer and triethanolamine as the electron donor. The initial rate of the H 2 evolution was 141 μmol h − 1 , which was higher than that of Co 2 + cations (55 μmol h − 1 ). The efficient catalytic activity was attributed to that the [B-PW 9 O 34 ] 9 − units in the sample act as electron transmitters to accelerate charge transfer. Moreover, a possible mechanism was proposed to explain the H 2 evolution from water splitting in the present system.
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RSC Advances
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2015
·Vol. 5
·期 21
·16239-16249
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IF 3.84
Hong-Peng Jiao,Xiang Yu,Zhao-Qing Liu,Pan-Yong Kuang,Yuan-Ming Zhang
To overcome the drawback of low photocatalytic efficiency brought by fast electron–hole recombination and narrow photoresponse range, the heterostructured Bi2S3/BiOBr microspheres were designed and synthesized via a facile one-pot solvothermal method. The as-prepared heterostructured Bi2S3/BiOBr photocatalyst exhibits significantly enhanced photoelectrochemical performance and photocatalytic activity for decomposing rhodamine B (RhB) and Brilliant ponceau 5R (BP) compared with pure BiOBr under visible light irradiation, which could be mainly attributed to the formation of a heterojunction in the Bi2S3/BiOBr interface, which can efficiently facilitate the separation of photogenerated electron–hole pairs. Furthermore, a terephthalic acid photoluminescence (TA-PL) probing test and radical trapping experiments demonstrate that the h+ and ·O2− radicals are the dominant reactive species while ·OH radicals could be neglected. In addition, the possible enhanced photocatalytic mechanism is proposed on the basis of the calculated energy band positions and radical trapping experiments.
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NANO
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2014
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IF 1.26
SHAOFANG SUN,YAFAN WU,XIAN ZHANG,ZHONGJIE ZHANG,YAN YAN,WEISHENG GUAN
The removal of CIP from the environment has become a mandatory issue. In our paper, we have realized the visible-light-driven degradation of CIP on the BiVO 4 – Bi 2 WO 6 nano-heterojunction photocatalysts. The synthesized photocatalysts were characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HRTEM), ultraviolet-visible (UV-Vis) absorption spectra and photoluminescence (PL) spectra. Compared with the single-phase BiVO 4 and Bi 2 WO 6 counterparts, BiVO 4 – Bi 2 WO 6 nano-heterojunction photocatalysts show enhanced photocatalytic degradation activities in visible-light-driven CIP degradation. Particularly, when R ( Bi 2 WO 6 ∕ BiVO 4 ) = 10 wt .%, the products exhibit the highest CIP degradation ratio in 60 min of 76.8% under visible light illumination. The tentative mechanism of the interface charge transfer (IFCT) effect in the BiVO 4 – Bi 2 WO 6 heterojunction structure is also discussed by using the band position calculation.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2014
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IF 2.235
Gehong Zhang,Weisheng Guan,Hao Shen,Xian Zhang,Weiqiang Fan,Changyu Lu,Hongye Bai,Lisong Xiao,Wei Gu,Weidong Shi
In our work, we have successfully synthesized WO3 nanosheets via a simple, fast, and organic additives-free hydrothermal method. The obtained products are 200–500 nm-sized with square corners and high crystallinity. A possible formation mechanism of WO3 nanosheets is discussed in this study based on the experimental results and our understanding. WO3 nanosheets modified with Pt exhibit enhanced photocatalytic activity of tetracycline compared with bare WO3 nanosheets under visible-light irradiation (λ > 420 nm). Furthermore, the effects of Pt as cocatalyst can be clearly drawn, and the degradation ratio of 2% Pt/WO3 nanosheets is over 3 times that of bare WO3 nanosheets, which is reasonable to expect the obvious Pt-dependent activity. The addition of 10 mL of iso-propanol leads to a considerable decreased degradation ratio (DR) of tetracycline (TC) on 2% Pt/WO3 photocatalysts, further indicating the ·OH radicals do exist in the process of the photocatalytic oxidation (PCO) of TC.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2013
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IF 3.548
Jianjun Ding,Wenhao Yan,Song Sun,Jun Bao,Chen Gao
A series of graphene/CaIn 2 O 4 composites were synthesized using a facile solvothermal method to improve the photocatalytic performance of CaIn 2 O 4 . The reduction of graphene oxide to graphene and the deposition of CaIn 2 O 4 nanoparticles on the graphene sheets can be achieved simultaneously during the solvothermal process. The photocatalytic activities of as-prepared graphene/CaIn 2 O 4 composites for hydrogen evolution from CH 3 OH/H 2 O solution were investigated under visible light irradiation . It was found that graphene exhibited an obvious influence on the photocatalytic activity of CaIn 2 O 4 . The graphene/CaIn 2 O 4 composite reached a high H 2 evolution rate of 62.5 μmol h −1 from CH 3 OH/H 2 O solution when the content of graphene was 1 wt%. Furthermore, the 1 wt% graphene/CaIn 2 O 4 composite did not show deactivation for H 2 evolution for longer than 32 h. This work could provide a new insight into the fabrication of visible light driven photocatalysts with efficient and stable performance.
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CHINESE JOURNAL OF POLYMER SCIENCE
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2013
·Vol. 31
·期 11
·1579-1589
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IF 1.27
Liu Wei,Sun Ming-liang,Liu Qian,He Ben-lin,Ge Hong-lun,Sun Miao,Zhang Qin-jie,Wang Wei
Synthesis and electrochemical polymerization of 9,9-bis(2-(2-(2-methoxy ethoxy)ethoxy)ethyl)-fluorene (EO-F) into poly[9,9-bis(2-(2-(2-methoxy ethoxy)ethoxy)ethyl)-fluorene] (EO-PF) films are reported. The boron trifluoride diethyl etherate electrolyte enables facile preparation of EO-PF films at lower potential compared to LiClO 4 /MeCN and the electrochemical polymerizations are discussed. The EO-PF shows good electrochemical behavior and can be dissolved in solvents such as DMSO and THF. The solubility of EO-PF in THF is 2 mg·mL −1 and the number average molecular weight is 35300 with a polydispersity index of 1.65. The side chains on C 9 position of the monomer maintain unchanged after electrooxidation into corresponding polymer. The EO-PF dissolved in THF under 365 nm ultraviolet light is sky blue light emitting with the Commission Internationale de L’Eclairage-CIE coordinates of (0.19, 0.15). The electropolymerized EO-PF is used for the first time in chemosensing metal ions, demonstrating fluorescence quenching for Mn 2+ and Fe 3+ while fluorescence enhancement for Cr 6+ ions.
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MATERIALS RESEARCH BULLETIN
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2015
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IF 2.288
Weicheng Xu,Jianzhang Fang,Ximiao Zhu,Zhanqiang Fang,Chaoping Cen
A series of novel p−n junction photocatalysts BiOI/Bi 2 Sn 2 O 7 (BiOI/BSO) were successfully fabricated via a facile hydrothermal method. The phase structures, morphologies and optical properties of the as-prepared samples were studied by XRD, TEM, HRTEM, BET, XPS, UV–vis DRS and photoluminescence (PL) spectroscopy. The results showed that BiOI/BSO heteronanostructures displayed much higher photocatalytic activity than pure BSO and BiOI for the degradation of rhodamine B (RhB). The best photocatalytic activity of BiOI/BSO with almost 99.9% RhB degradation situated at molar percentage ratio of 4% after 6 h irradiation. The enhanced photocatalytic performance of BiOI/BSO could be mainly attributed to the formation of the heterojunction between p-BiOI and n-BSO, which effectively restrains the recombination of photoinduced electron–hole pairs. Moreover, the study of radical scavengers affirmed that h + and •O 2 − were the primary reactive species for the degradation of RhB.
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RSC Advances
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2015
·Vol. 5
·期 20
·15110-15117
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IF 3.84
Chunyan Zhang,Jiasheng Lai,Juncheng Hu
A series of Mn-doped CdS hollow sphere photocatalysts has been directly synthesized by a simple and facile hydrothermal route for the first time. It was demonstrated that GSH acts as the S source and a gas bubble-template in this process. The products were characterized by XRD, SEM, TEM, HRTEM, XPS, and UV-vis spectroscopy. The as-prepared CdS and Mn-doped CdS hollow spheres all showed much higher activity than P25 under visible light (λ > 420 nm) irradiation. Among them, the 2.0 mol% Mn-doped CdS sample exhibited the highest photoactivity for the removal of organic pollutant RhB, and about 99.2% MO was decomposed after 50 min of visible light irradiation. Moreover, this catalyst also showed good stability, and after four cycles, the degradation efficiency still remained at 85%. The excellent photoactivity of the as-prepared Mn-doped CdS hollow spheres could be attributed to the synergistic effects of its appropriate band-gap structure and the special porous spherical morphology. The unique hollow sphere structure may favor the harvesting of excited light due to its special multiple scattering effect within the interior space, and the doping of Mn2+ may facilitate the generation of photoinduced electrons and hole pairs, and inhibit their recombination rate by acting as temporary trapping sites. This material may have great application potentials in environmental remediation and energy harvesting.
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CATALYSIS COMMUNICATIONS
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2013
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IF 2.915
Jie Cui,Ting He,Xu Zhang
Platinum ion doped magnetic TiO 2 (Fe 3 O 4 @SiO 2 @Pt ion –TiO 2 ) hybrid microspheres with uniform magnetic cores were synthesized and characterized in this work. The results indicate that the photoactivity of Fe 3 O 4 @SiO 2 @Pt ion –TiO 2 is much higher than Fe 3 O 4 @SiO 2 @TiO 2 for the decolorization of acid orange 20 under UV–visible light irradiation. The trend for the final degradation ratio with Fe 3 O 4 @SiO 2 @Pt ion –TiO 2 is quite small, even after seven repetitive experiments. These data indicate that the magnetic microspheres possess the potential to be effective and stable catalysts. The results demonstrate that the Pt ion doped magnetic catalyst meets the needs for both immobilization and high photoactivity.
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