ChemSusChem
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2016
·Vol. 9
·期 10
·1118-1124
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IF 7.116
Xuefeng Liu,Zipeng Xing,Hang Zhang,Wenmei Wang,Yan Zhang,Zhenzi Li,Xiaoyan Wu,Xiujuan Yu,Wei Zhou
Graphical Pass the Mo : A 3 D sandwich of mesoporous black TiO 2 (MBT)/MoS 2 /MBT was fabricated using a facile mechanochemistry method combined with an in situ solid-state chemical reduction approach. The material exhibited excellent visible-light-driven photocatalytic performance for pollutant degradation and hydrogen evolution owing to the sandwich-like heterojunction structure and Ti 3+ doping. A novel 3 D mesoporous black TiO 2 (MBT)/MoS 2 /MBT sandwich-like nanosheet was successfully fabricated using a facile mechanochemical process combined with an in situ solid-state chemical reduction approach, followed by mild calcination (350 °C) under an argon atmosphere. The MBT/MoS 2 /MBT exhibits a 3 D sandwich-like nanosheet structure and heterojunctions are formed at the interfaces between MoS 2 and black TiO 2 . The significantly narrowed band gap of MBT/MoS 2 /MBT is attributed to the introduction of MoS 2 and the formed Ti 3+ species in the frameworks. The visible-light photocatalytic degradation rate of methyl orange and the hydrogen production rate are as high as 89.86 % and 0.56 mmol h −1 g −1 , respectively. The introduction of MoS 2 and Ti 3+ in the frameworks favors the visible-light absorption and the separation of photogenerated charges, and the 3 D sandwich-like heterojunction structure facilitates the transfer of photogenerated charges.
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Polymer Chemistry
·
2016
·Vol. 7
·期 20
·3444-3450
·
IF 5.687
Dehua Li,Jinhui Jiang,Qiutong Huang,Guang Wang,Meiduo Zhang,Jianzhong Du
We report a compound polymer micelle with light-triggered “on–off” switching of fluorescence based on the self-assembly of two block copolymers. First, the naphthalimide fluorophore is incorporated into poly(styrene-stat-naphthalimide)-b-poly(N-isopropyl acrylamide) [P(St-stat-MANI)-b-PNIPAM]. Second, the naphthopyran unit is engineered in poly(styrene-stat-naphthopyran)-b-poly(N-isopropyl acrylamide) [P(St-stat-NP)-b-PNIPAM] to manipulate the fluorescence when self-assembled into compound micelles with fluorophore-containing P(St-stat-MANI)-b-PNIPAM. The fluorescence of naphthalimide (MANI) can be modulated between “on” and “off” states by the photochromic reaction of naphthopyran (NP) upon UV irradiation and thermal fading reaction. Furthermore, Nile red (NR) was encapsulated in the micelle and showed a controlled release behavior by light. Our strategy may be extended for designing a range of multifunctional smart fluorescent materials such as chemical sensors.
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ELECTROCHEMISTRY COMMUNICATIONS
·
2016
·
IF 4.569
Hua-Bin Fang,Nan Li,Zhibing Xue,Yikun Zhang,Yan-Zhen Zheng,Xia Tao
Tungsten disulfide (WS 2 ) has recently emerged as a narrow-band visible-light-driven photocatalyst; however, high recombination of photo-induced electrons and holes becomes a major concern to advance its photocatalytic performance. Here we for the first time adopt manganese oxide (MnO x ) as a hole-trapping material to decorate WS 2 nanosheets by photo-deposition in MnSO 4 solution. The MnO x decorated WS 2 (MnO x /WS 2 ) is found to exhibit more negative flat band potential, lower impedance and higher photocurrent response compared with pure WS 2 . These features beneficial to charge transfer and separation render the MnO x /WS 2 nanosheets highly active and visible-light-driven photocatalyst in RhB degradation. Further, the hole-trapping function of MnO x in promoting efficient charge separation of MnO x /WS 2 is experimentally demonstrated.
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RSC Advances
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2017
·Vol. 7
·期 46
·28797-28801
·
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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Frontiers in Plant Science
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2017
·
IF 4.291
Ye Shenyi,Shao Qingsong,Xu Mengjie,Li Shuailing,Wu Mei,Tan Xin,Su Liyang
The aim of this study was to investigate the effects of light quality on the morphological traits, leaf anatomical characteristics, antioxidant enzyme (superoxide dismutase, catalase, and peroxidase) activities, photosynthetic pigments content, and bioactive compounds (phenols, flavonoids, and polysaccharides) content in Anoectochilus roxburghii. Plants of A. roxburghii were grown under light filtered through four differently colored films for 8 months. The four treatments were red film (RF), blue film (BF), yellow film (YF), and colorless plastic film (control, CK). Compared with the A. roxburghii plants in CK, those in the BF treatment showed significantly greater stem diameter, fresh weight, leaf area, stomatal frequency, chlorophyll content (Chl a, Chl b, Chl a+b), antioxidant enzyme activities, and active compound (polysaccharides, flavones) content. The plants in the RF treatment showed the greatest plant height and phenolics contents. These results show that growing A. roxburghii plants under blue film is a useful technique to improve quality. This technique is conducive to achieving large-scale sustainable production of high-quality plant materials.
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Science Bulletin
·
2017
·
IF 4.092
Jie Xu,Zhenye Chen,Hongwen Zhang,Guibin Lin,Huaxiang Lin,Xuxu Wang,Jinlin Long
For a long time, there has been global concern over the environment and energy problems. Recently, the problems, which have brought about serious effect on the global living condition, have been in the “spotlight” and given impetus to the universal’s efforts to head for the same direction: stem the worst warming and strive for the renewable energy source . Hydrogen peroxide (H 2 O 2 ) is undoubtedly a good choice, which holds the promise as a clean, efficient, safe and transferrable energy carrier. Octahedral coordination polymer , Cd 3 (C 3 N 3 S 3 ) 2 , was found to be a robust photocatalyst for H 2 O 2 generation under visible light irradiation . To further improve the H 2 O 2 generation efficiency, adhering the octahedron to reduced graphene (rGO) was applied as the strategy herein. The study shows that by adhering Cd 3 (C 3 N 3 S 3 ) 2 to rGO , the formation of H 2 O 2 is 2.5-fold enhanced and its deformation is concurrently suppressed. This work not only demonstrates the effectiveness of adhering Cd 3 (C 3 N 3 S 3 ) 2 polymer to rGO for the improvement of the polymer’s photocatalytic performance, but also proposes a general way for the fabrication of graphene/coordination compound hybrids for maximizing their synergy.
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WORLD JOURNAL OF MICROBIOLOGY & BIOTECHNOLOGY
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2017
·Vol. 33
·期 2
·1-14
·
IF 1.658
Guan Jian,Shen Songdong,Wu Hao,Liu Xin,Shen Weijie,He Yuan,Duan R.
The filamentous Cyanobacterium Arthrospira is commercially produced and is a functional, high-value, health food. We identified 5 low temperature and low light intensity tolerant strains of Arthrospira sp. (GMPA1, GMPA7, GMPB1, GMPC1, and GMPC3) using ethyl methanesulfonate mutagenesis and low temperature screening. The 5 Arthrospira strains grew rapidly below 14 °C, 43.75 μmol photons m −2 s −1 and performed breed conservation at 2.5 °C, 8.75 μmol photons m −2 s −1 . We used morphological identification and molecular genetic analysis to identify GMPA1, GMPA7, GMPB1 and GMPC1 as Arthrospira platensis , while GMPC3 was identified as Arthrospira maxima . Growth at different culture temperatures was determined at regular intervals using dry biomass. At 16 °C and 43.75 μmol photons m −2 s −1 , the maximum dry biomass production and the mean dry biomass productivity of GMPA1, GMPB1, and GMPC1 were 2057 ± 80 mg l −1 , 68.7 ± 2.5 mg l −1 day −1 , 1839 ± 44 mg l −1 , 60.6 ± 1.8 mg l −1 day −1 , and 2113 ± 64 mg l −1 , 77.7 ± 2.5 mg l −1 day −1 respectively. GMPB1 was chosen for additional low temperature tolerance studies and growth temperature preference. In winter, GMPB1 grew well at mean temperatures <10 °C, achieving 3258 mg dry biomass from a starting 68 mg. In summer, GMPB1 grew rapidly at mean temperatures more than 28 °C, achieving 1140 mg l −1 dry biomass from a starting 240 mg. Phytonutrient analysis of GMPB1 showed high levels of C-phycocyanin and carotenoids. Arthrospira metabolism relates to terpenoids, and the methyl- d -erythritol 4-phosphate pathway is the only terpenoid biosynthetic pathway in Cyanobacteria. The 1-deoxy- d -xylulose 5-phosphate reductoisomerase (DXR) gene from GMPB1 was cloned and phylogenetic analysis showed that GMPB1 is closest to the Cyanobacterium Oscillatoria nigro-viridis PCC711. Low temperature tolerant Arthrospira strains could broaden the areas suitable for cultivation, extend the seasonal cultivation time, and lower production costs.
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TALANTA
·
2017
·
IF 4.162
Sifang Lv,Feng Chen,Chunyan Chen,Xiaoming Chen,Hang Gong,Changqun Cai
We report a rapid and facile resonance light scattering (RLS) technique that utilizes CdTe quantum dots (CdTe QDs) probe to detect microRNA-122. The RLS sensor is ingeniously designed with P1 and P2 , two cDNA sequence probes with partially complementary sequences to miRNA-122. The amine-modified P1 and P2 are coupled to the surface of QDs to form functional QDs-P1 and QDs-P2 conjugates, which are collectively referred to as QDs-P. The cDNAs hybridize with the target miRNA to rapidly induce the self-assembly of QDs probe and change RLS intensity. The proposed technique can detect miRNA-122 within 40 min. RLS intensity is enhanced in proportion with miRNA-122 concentrations of 0.16–4.80 nM and has a low detection limit of 9.4 pM. In addition, the assay satisfactorily detects miRNAs in human serum samples. Thus, the assay has considerable potential for the analysis of other interesting tumor makers.
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Small
·
2016
·Vol. 12
·期 31
·4286-4298
·
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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ACS Applied Materials & Interfaces
·
2016
·
IF 7.145
Lili Yan,Zhichun Li,Mingxing Sun,Guoqing Shen,Liang Li
Semiconductor quantum dots (QDs) are suitable light absorbers for photocatalysis because of their unique properties. However, QDs generally suffer from poor photochemical stability against air, limiting their applications in photocatalysis. In this study, a stable solar-light-driven QDs-containing photocatalytic film was developed to facilitate photocatalytic degradation of the soil fumigant 1,3-dichloropropene (1,3-D). Highly stable CuInS2/ZnS:Al core/shell QDs (CIS/ZnS:Al QDs) were synthesized by doping Al into the ZnS shell and controlling ZnS:Al shell thickness; the CIS/ZnS:Al QDs were subsequently combined with TiO2 to form a CIS/ZnS:Al-TiO2 photocatalyst. The optimized ZnS:Al shell thickness for 1,3-D photodegradation was approximately 1.3 nm, which guaranteed and balanced the good photocatalytic activity and stability of the CIS/ZnS:Al-TiO2 photocatalyst. The photodegradation efficiency of 1,3-D can be maintained up to more than 80% after five cycles during recycling experiment. When CIS/ZnS:Al-TiO2 was deposited as photocatalytic film on a flexible polyethylene terephthalate substrate, over 99% of cis-1,3-D and 98% of trans-1,3-D were depleted as they passed through the film during 15 h of irradiation under natural solar light. This study demonstrated that the stable CIS/ZnS:Al-TiO2 photocatalyst both in powder and film form is a promising agent for photodegradation and emission reduction of soil fumigants.
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NANOTECHNOLOGY
·
2016
·Vol. 27
·期 35
·355402
·
IF 3.573
Chunyan Zhang,Yongfeng Lu,Qingqing Jiang,Juncheng Hu
CdS hollow spheres (CdS HS) coupled with graphitic carbon nitride (g-C3N4) photocatalysts are synthesized and characterized by x-ray diffraction (XRD), transmission electron microscopy (TEM), ultraviolet-visible diffuse reflection spectroscopy (DRS), x-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FT-IR), and photoluminescence spectroscopy (PL). The effect of CdS content on CdS HS/g-C3N4 activity is investigated by the degradation of Rhodamine B (RhB). The sample of 20 wt% CdS content shows the best photocatalytic performance under visible-light irradiation, with the corresponding RhB degradation rate reaching 97.3%. The excellent photoactivity of CdS HS/g-C3N4 is attributed to the synergistic effect of g-C3N4 and CdS HS. A possible photocatalytic mechanism of the CdS HS/g-C3N4 composite is proposed and corroborated by PL.
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INORGANIC CHEMISTRY
·
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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