RSC Advances
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2017
·Vol. 7
·期 46
·28797-28801
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IF 3.108
W. X. Liao,X. L. Zhao,T. S. Wang
The relatively wide band gap (>2.0 eV) and limited light absorption ranges (only up to 600 nm) of photocatalysts severely restrict the exploitation of solar energy. Herein, we developed a Bi7.38Cr0.62O12+x crystal photocatalyst with a narrow band gap of 1.98 eV and a broad light absorption range of ∼650 nm. Unlike other broad light absorption range photocatalysts (up to ∼650 nm) such as red phosphorus, Fe2O3, and CdSe, which are either unstable or show low photocatalytic performances, the as-synthesized Bi7.38Cr0.62O12+x crystal photocatalyst exhibits a steady photocatalytic activity for the decomposition of methylene blue, methyl blue, and phenol, and production of O2.
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RESEARCH ON CHEMICAL INTERMEDIATES
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2017
·Vol. 43
·期 9
·5217-5228
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IF 1.369
Qin Na,Jing Kaiqiang,Chen Rui,Xiong Jinhua,Liang Ruowen,Li Zhaohui,Wu Ling
Abstract SnS 2 /SnO 2 nanocomposites have been successfully prepared via a hydrothermal method using electrospun SnO 2 nanotubes as both substrates and reactants. The ratios of the nanocomposites are controlled by varying the concentration of thioacetamide during the solvothermal synthesis processes. The as-prepared SnS 2 /SnO 2 nanocomposites exhibit considerable improvement on the photocatalytic activities for the reduction of aqueous Cr(VI) under visible light irradiation. Their photoactivities are also much higher than that of SnS 2 nanoplates and a physical mixture of SnO 2 and SnS 2 . In particular, the SnS 2 /SnO 2 -B sample exhibits the highest photocatalytic activity. After visible light irradiation for 60 min, the reduction rate has reached about 100%. The photoelectrochemical analyses further show that the high photocatalytic activity of the SnS 2 /SnO 2 -B sample can be ascribed to the unique structural features and the intimate interfacial contact between SnS 2 and SnO 2 , which is more effective separation of the photo-generated carriers. Graphical Abstract
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Journal of Materials Chemistry A
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2017
·Vol. 5
·期 21
·10651-10657
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IF 8.867
Yansong Zhou,Gang Chen,Edward H. Sargent,Taotao Zhuang,Cao Thang Dinh,Fang He
Solar energy conversion through artificial photosynthesis is of considerable interest. Unfortunately, the efficiencies of current photocatalysts are limited by the rapid recombination of photogenerated charge carriers and their failure to respond to the long-wavelength light region in sunlight. To harness solar energy efficiently, we propose, for the first time, the concept of freestanding nano-sized photoelectrodes as efficient photocatalysts for artificial photosynthesis applications. Through introducing charge transporting components and incorporating photoactive narrow bandgap semiconductors, a long wavelength responding and freestanding nano-photoelectrode composed of PEDOT:PSS/CdS/ZnO/WS2 has been fabricated. This freestanding nano-photoelectrode can serve as a highly efficient and stable photocatalyst for hydrogen (H2) evolution with a rate of as high as 1028 μmol h−1, without loading any noble metal containing co-catalyst, under simulated sunlight irradiation. Impressively, the designed nano-photoelectrode shows an outstanding apparent quantum efficiency (APQ) of 0.3% for H2 evolution at a wavelength of λ = 600 nm.
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Molecular Catalysis
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2017
·
IF 0
Junlei Zhang,Zhen Ma
Ag 3 VO 4 /BiOBr n-p heterojunctions were prepared via chemical deposition. Ag 3 VO 4 /BiOBr consists of Ag 3 VO 4 nanoparticles with sizes ranging from several to tens nanometers and flower-like BiOBr microspheres composed of irregular nanosheets. The photocatalytic performance of Ag 3 VO 4 /BiOBr and relevant samples was investigated in the visible-light-driven degradation of Rhodamine B (RhB), methylene blue (MB), methyl orange (MO), and tetracycline hydrochloride (TC). Ag 3 VO 4 /BiOBr heterojunction with a BiOBr/Ag 3 VO 4 mass ratio of 10% was more active than a physical mixture of Ag 3 VO 4 and BiOBr, showing the importance of forming the heterojunction. Photogenerated holes (h + ) and superoxide radical anions ( O 2 − ) were found to be the primary active species. A possible mechanism for the enhanced photocatalytic performance was proposed.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2017
·
IF 9.446
Zengyu You,Yuxuan Su,Yang Yu,Hui Wang,Tian Qin,Fang Zhang,Qianhong Shen,Hui Yang
A novel g-C 3 N 4 nanorod/InVO 4 hollow sphere composite was fabricated through a facile template-free method. The structure-property relationship was analyzed, and the formation mechanism of such structure and morphology was also proposed based on the observation from time-dependent morphology evolvement. The results show that InVO 4 hollow spheres uniformly load on the surface of g-C 3 N 4 nanorod and thus forming the heterojunction with an intimate interface. The bulk g-C 3 N 4 experiences a possible peeling process to form the rod-like structure, during which the mass ratio of InVO 4 and ultraphonic process play a key role. Moreover, bubble-template is believed to determine the formation of InVO 4 hollow sphere. Owing to this unique structure and morphology, the enhanced visible-light photocatalytic activities are achieved because of the synergistic effect of light harvesting, high transfer efficiency and enhanced separation efficiency of photo-generated carriers. And more importantly, this fabrication method combines heterojunction constructing with morphology controlling of g-C 3 N 4 in one step, and thus may supply a new idea for the preparation of other g-C 3 N 4 based composites.
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Science Bulletin
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2016
·
IF 0
Xiaoping Liu,Hao Qin,Weiliu Fan
Band offset is a dominant factor affecting the photocatalytic performance of heterostructure photocatalysts . Therefore, controlling the band gap structure of semiconductors is a key challenge in the development of efficient photocatalysts. We used a typical in situ-method to prepare diverse graphite-phase carbon nitride (g-C 3 N 4 ) samples from melamine , thiourea , and a mixture thereof, and found that they exhibited band gaps between 2.3–2.8 eV. From UV–Vis spectra and X-ray photoelectron spectroscopy measurements, we determined that the g-C 3 N 4 samples exhibited different band gap values and valence band positions. On this basis, we constructed g-C 3 N 4 /m-LaVO 4 heterojunctions with different band offsets. UV–Vis spectra and X-ray photoelectron spectroscopy measurements revealed that the valence band offsets (VBOs) of the different heterojunctions were similar, but their conduction band offsets (CBOs) were significantly different. Photocatalytic experiments revealed that the reaction rate was enhanced with an increase in the CBO value. Furthermore, the three-phase g-C 3 N 4 /g-C 3 N 4 /m-LaVO4 heterojunction composed of m-LaVO4 and mixed g-C 3 N 4 showed the highest photocatalytic activity , which was mainly due to the construction of a multilevel structure. This work investigates the influence of the band offset on heterojunction photoelectrochemical properties and provides a new strategy to improve the photocatalytic activity by constructing multilevel structures.
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SENSORS AND ACTUATORS B-CHEMICAL
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2016
·
IF 4.758
Shuguang Yan,Dongyan Deng,Hongjie Song,Yingying Su,Yi Lv
A highly efficient resonance light scattering (RLS) and visual probe based on mercaptosuccinic acid (MA) modified copper sulfide (CuS) nanosheets has been successfully established for sensitive and selective detection of l -cysteine ( l -Cys). The CuS nanosheets are facilely synthesized via a reductive solution route with MA as reductant and modifier at room temperature. The as-prepared CuS nanosheets have been characterized by scanning electron microscope (SEM), X-ray photoelectron spectroscopy (XPS), X-ray powder diffraction (XRD), UV–vis spectra and Fourier transform infrared spectroscopy (FTIR), respectively. Experimental results indicated that formation of hydrogen bonds and thiol-Cu chemical bonds between CuS nanosheets and l -Cys significantly contributed to the sensitivity and selectivity of the proposed method no matter for RLS or visual detection of l -Cys. Under the optimum experimental conditions, the linear range of the l -Cys RLS probe was 2.78 (10σ/K)-7000 nmol/L ( r = 0.9944), and the detection limit was 0.83 nmol/L (3σ/K). As to visual detection, the detection limit could also be extended to 75 μmol/L.
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INORGANIC CHEMISTRY
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2016
·
IF 4.82
Molin Zhou,Ke Xiao,Xingxing Jiang,Hongwei Huang,Zheshuai Lin,Jiyong Yao,Yicheng Wu
Visible-light-responsive photocatalytic materials have important applications. In this article, through inserting electropositive ion Ba2+ into the three-dimensional framework of ZnSe, a one-dimensional chalcogenide Ba2ZnSe3 has been obtained by traditional solid-state reaction. It crystallizes in orthorhombic centrosymmetric space group Pnma with unit cell parameters of a = 9.0744(2) Å, b = 4.4229(1) Å, c = 17.6308(4) Å, and Z = 4. Its structure features [ZnSe3]4– anionic straight chains parallel to the b direction, which are further separated by Ba2+ cations filling in the cavities. On the basis of the UV–vis–NIR diffuse reflectance spectroscopy, Ba2ZnSe3 possesses a typical direct band gap of 2.75 eV, which is in good agreement with the electronic structure calculation. Moreover, Ba2ZnSe3 shows good visible-light-responsive photocatalytic activity and excellent thermal stability and cyclability, which are favorable for its application.
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PubMed
高影响因子
Small
·
2016
·Vol. 12
·期 31
·4286-4298
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IF 8.315
Qi Lei,Wen-Xiu Qiu,Jing-Jing Hu,Peng-Xi Cao,Cheng-Hui Zhu,Han Cheng,Xian-Zheng Zhang
In this work, a matrix metalloproteinase (MMP)-triggered tumor targeted mesoporous silica nanoparticle (MSN) is designed to realize near-infrared (NIR) photothermal-responsive drug release and combined chemo/photothermal tumor therapy. Indocyanine green (ICG) and doxorubicin (DOX) are both loaded in the MSN modified with thermal-cleavable gatekeeper (Azo-CD), which can be decapped by ICG-generated hyperthermia under NIR illumination. A peptidic sequence containing a short PEG chain, matrix metalloproteinase (MMP) substrate (PLGVR) and tumor cell targeting motif (RGD) are further decorated on the MSN via a host–guest interaction. The PEG chain can protect the MSN during the circulation and be cleaved off in the tumor tissues with overexpressed MMP, and then the RGD motif is switched on to target tumor cells. After the tumor-triggered targeting process, the NIR irradiation guided by ICG fluorescence can trigger cytosol drug release and realize combined chemo/photothermal therapy.
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PubMed
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2017
·
IF 9.446
Zhan Wang,Xianjun Lang
Herein, we report an efficient protocol for the selective oxidation of amines with the sole involvement of conduction band electrons (e cb − ) of TiO 2 for both the activation of O 2 and the ensuing oxidation reaction. Visible light was harvested by dye molecules on the surface of TiO 2 , which injects electrons into its conduction band, generating dye radical cations. Charge transfers from dye radical cations to amines are relayed by the catalytic cycle of (2,2,6,6-tetramethylpiperidin-1-yl)oxyl (TEMPO) to TEMPO + , which is an oxidant that can conduct the direct two-electron oxidation of amines to imines. TEMPO was regenerated by the oxidation of TEMPOH with superoxide generated by the interaction of e cb − and O 2 . This work suggests that one can exploit the strategy of cooperative photocatalysis with each component performing in its optimal role: TiO 2 for O 2 activation, dye for visible light harvesting, and TEMPO for oxidative transformations.
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高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2017
·
IF 9.446
Jianhua Yang,Zhengkui Li,Hongjie Zhu
A novel hydrogel catalyst (p(HEA/NMMA)-CuS) with the function of adsorption and degradation of organic pollutants in water was successfully synthesized using irradiation polymerization and in situ precipitation methods The composite hydrogel catalyst was characterized by SEM-EDS, TEM, swelling kinetics, zeta potential, TGA, XPS, FTIR and XRD. Besides, the effects and mechanisms of adsorption and degradation of sulfamethoxazole(SMX) as the representative pollutant by p(HEA/NMMA)-CuS hydrogel were observed. The results presented that adsorption process of SMX on complex hydrogel fit well to Langmuir monolayer adsorption, and followed a pseudo-second-order rate equation. The decomposition of SMX by p(HEA/NMMA)-CuS hydrogel in aqueous solution under 500 w visible light achieved balance in 24 h, the removal ratio reached 95.91%, and the SMX was mineralized with 43.56%. Hydroxyl radicals was detected as the reactive species using EPR in the system, degradation intermediates of SMX were further analyzed by LC-TOF-MSMS, a possible pathway for SMX degradation was presented. The degradation mechanism of SMX was also illustrated by theoretical calculations of frontier electron densities. Furthermore, mineralization, stability and regeneration results indicated that the developed hydrogel catalyst, p(HEA/NMMA)-CuS hydrogel, was promising in practical application.
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高影响因子
CERAMICS INTERNATIONAL
·
2016
·
IF 2.758
Qian Wen Cao,Yi Fan Zheng,Xu Chun Song
A series of energy band adjustable Bi 2 W x Mo 1−x O 6 -BiOCl (x=0, 0.2, 0.4, 0.6, 0.8 and 1.0) heterojunctions were successfully synthesized through a solvothermal crystallization method. Characteristics and properties of the products were investigated using XRD , TEM , HRTEM , EDS , and DRS. Meanwhile, the photocatalytic activities of Bi 2 W x Mo 1−x O 6 -BiOCl composites were estimated by degrading Rhodamine B (RhB) under visible light irradiation. The results show that Bi 2 W 0.6 Mo 0.4 O 6 -BiOCl (1:14) composite displayed the best photocatalytic performance among all the as-prepared samples. The enhanced visible-light photocatalytic activities of Bi 2 W x Mo 1−x O 6 -BiOCl heterojunctions could be attributed to the generation of the adjustable energy band configuration, which has great influences on the generation of photoinduced carriers through inhibiting the recombination of electron-hole pairs. According to the active species trapping results and energy band calculation, the mechanism of the significant enhancement of the photocatalytic activity was proposed. This method may provide new insights into the energy band adjusting of photocatalysts used in environmental remediation and photocatalytic water purification.
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