SENSORS AND ACTUATORS B-CHEMICAL
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2017
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IF 5.401
Xiao Fang Zhang,Na Li,Yu Ling,Li Tang,Nian Bing Li,Hong Qun Luo
As one of the DNA damage repair enzymes, uracil-DNA glycosylase (UDG) plays an important role in maintaining genomic integrity. By linked bridge hybridizing-induced split G-quadruplex (SQ), we demonstrate here the construction of a simple and sensitive DNA machine for the detection of UDG activity. The satisfactory split G-quadruplex sequences (SQS) were successfully selected to be the ingredients of SQ formation. In this work, UDG recognized and removed the uracil bases from the stem of hairpin DNA (HP). And then, HP with a low melting temperature hybridized with designed SQS, forming a three-way DNA structure with an SQ. With the addition of Thioflavin T, a dramatical enhancement of fluorescence intensity was presented due to the G-quadruplex/Thioflavin T complex formation. The detection limit was as low as 7.8 × 10 −3 U/mL. And we also successfully investigated the performance of UDG activity in the HeLa cell lysate. This optical DNA machine with the merits of being simple, rapid, and economical was flexibly suitable for not only active UDG assay but also diverse target detection by adjusting the recognition region of the HP.
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高影响因子
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
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2017
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IF 2.625
Zhilan Cai,Yuming Zhou,Shuaishuai Ma,Shiwei Li,Haiyong Yang,Shuo Zhao,Xi Zhong,Wenting Wu
A novel g-C 3 N 4 /CuS p - n heterostructured photocatalyst has been fabricated through an in situ synthesis technique. The samples were characterized through X-ray diffraction, energy dispersive spectroscopy, X-ray photoelectron spectroscopy, transmission electron microscopy and UV–vis spectroscopy. And the results indicated that CuS nanoparticles were closely anchored on the surface of g-C 3 N 4 with good dispersion. The g-C 3 N 4 /CuS heterojunctions exhibited enhanced photocatalytic performance in degradation of RhB and MB than that of pure g-C 3 N 4 and CuS, and the selected sample of g-C 3 N 4 /CuS-2 displayed the best photocatalytic activity. The degradation rates of RhB and MB with g-C 3 N 4 /CuS-2 photocatalyst were 8.914 and 13.543 times higher than that of pure g-C 3 N 4 , and 3.023 and 6.373 times higher than that of pure CuS, respectively. The enhancement of photocatalytic activity may be ascribed to the matched overlapping band structure and the interaction between CuS and g-C 3 N 4 . The interaction between g-C 3 N 4 and CuS would not only improve the optical absorption property of g-C 3 N 4 , but also create more interface for the efficiently transfer of photo-generated electron-hole pairs to restrict the recombination, which was proved by the photoluminescent spectra. Moreover, a possible photocatalytic mechanism has been tentatively proposed according to the experimental results.
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高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2017
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IF 9.446
Shao-jia Liu,Fa-tang Li,Yi-lei Li,Ying-juan Hao,Xiao-jing Wang,Bo Li,Rui-hong Liu
The mismatches of lattices and energy bands in heterojunction are the dominant factors restricting the generation efficiency of reactive oxygen species (ROS) that are powerful tools for water purification and anti-bacteria. In this paper, the mediated lattice matching role of amorphous Al 2 O 3 is presented for constructing the ternary g-C 3 N 4 /Al 2 O 3 /ZnO heterojunctions, which exhibit higher molecular oxygen activation performance than binary g-C 3 N 4 /ZnO and g-C 3 N 4 /Al 2 O 3 heterojunctions. The oxygen activation ability and the ROS generation were testified by the electron paramagnetic resonance (EPR) measurement, transformation of nitroblue tetrazolium (NBT) and degradation of methylene blue (MB). The ROS include superoxide anion radical ( O 2 − ) and consequent product of hydroxyl radical ( OH). The superior oxygen activation performance of the ternary heterojunctions can be attributed to the lattices matching of the mediated amorphous Al 2 O 3 and the resultant efficient cascade electron transfer.
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高影响因子
JOURNAL OF WUHAN UNIVERSITY OF TECHNOLOGY-MATERIALS SCIENCE EDITION
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2017
·Vol. 32
·期 4
·963-970
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IF 0.447
He Guanghua,Ke Wanwan,Liu Liang,Li Ya,Zheng Hua,Yin Yihua,Yi Ying
Superabsorbent hydrogels were prepared successfully from N -succinyl chitosan grafted poly(acrylic acid- co -acrylamide). The potassium persulfate (KPS), N , N ’-methylenebisacrylamide (MBA) were used as the initiator and crosslinker, respectively. Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM) were used to confirm the porous network structure of superabsorbent hydrogel. The effects of reaction parameters on the swelling behaviors of the superabsorbent hydrogels were investigated. The results indicated that water absorbency increased first, and then decreased gradually with the increase in the contents of monomer (AA+AM), KPS, MBA or acrylamide. The product had excellent water absorbency of 1375 g/g in distilled water and 83 g/g in 0.9wt% NaCl solution. Simultaneously, the superabsorbent hydrogels were pH sensitive. The antibacterial activities of the hydrogels against Escherichia coli ( E. coli ) were improved effectively because of polyamidoamine (PAMAM) dendrimer absorbed in the hydrogels.
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MATERIALS RESEARCH BULLETIN
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2016
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IF 2.435
Xueru Yan,Ruopeng Xu,Junkang Guo,Xiang Cai,Dengjie Chen,Langhuan Huang,Yongqiang Xiong,Shaozao Tan
A high efficient visible-light-region Cu 2 O/g-C 3 N 4 /RGO composite 3D aerogel photocatalyst was fabricated by a facile self-assemble method. The aerogel composite with various RGO and g-C 3 N 4 to Cu 2 O weight ratios was synthesized and characterized. The results showed that the Cu 2 O/g-C 3 N 4 heterojunction absorbed visible light region shifted to a lower energy. In order to improved photocatalytic activity, the Cu 2 O/g-C 3 N 4 heterojunction loaded on reduced graphene oxide sheets resulted in increasing absorption in the visible light range and improving photodegradation activity. The optimal content of Cu 2 O in the Cu 2 O/g-C 3 N 4 /RGO aerogel was 40%, which exhibited the effectively synthetized Cu 2 O/g-C 3 N 4 heterojunction, and greatly improved photocatalytic activity. Moreover, the ternary composite aerogel exhibited 96% (Methylene Blue) and 83% (Methyl Orange) degradation efficiency within 80 min. The combined heterojunction with synergistic effects of this novel composite aerogel account for the excellent photocatalytic efficiency.
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JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
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2016
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IF 4.179
Yinhua Jiang,Fan Li,Yan Liu,Yuanzhi Hong,Peipei Liu,Liang Ni
An interlayer structure hybrid photocatalyst of TiO 2 hollow sphere/g-C 3 N 4 (TOCN) has been successfully constructed via a facile impregnation process. The photocatalytic activity was evaluated by degrading Rhodamine B under visible irradiation. TOCN-2 with 33 wt.% g-C 3 N 4 had much higher photocatalytic efficiency (98.09%) than pure g-C 3 N 4 (18.62%) and TiO 2 hollow sphere (16.37%). Significantly, TOCN-2 showed much superior photocatalytic performance than TiO 2 nanoparticle/g-C 3 N 4 composite (53.16%), indicating the hollow morphology of TiO 2 also played a crucial role for RhB degradation. In TOCN system, both the morphology effect of TiO 2 and the synergistic effects between TiO 2 and g-C 3 N 4 resulted in significantly enhancing photocatalytic performance.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2016
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IF 3.299
Yuanzhi Hong,Yadong Meng,Guangyi Zhang,Bingxin Yin,Yong Zhao,Weidong Shi,Changsheng Li
Novel carbon quantum dots (CQDs)/graphitic-like carbon nitride (g-C 3 N 4 ) metal-free heterojunctions were firstly synthesized via a facile low temperature process. Multiple physicochemical techniques were carried out to characterize the samples. The CQDs with the average size of about 5 nm are attached to the surfaces of g-C 3 N 4 nanosheets. The photocatalytic activity of as-prepared samples was carefully evaluated by the degradation of rhodamine B (RhB) and tetracycline hydrochloride (TC-HCl) under visible light irradiation. Photocatalysis result displayed that the CQDs/g-C 3 N 4 heterojunctions can significantly enhance visible-light photocatalytic activity in compared to that of pristine g-C 3 N 4 . The reaction rate constant of the optimum active C0.50%/CN heterojunction for the photodegradation of RhB and TC-HCl were about 3.7-fold and 1.9-fold higher than that of bare g-C 3 N 4 , respectively. The efficiently enhanced photoactivity was attributed to the CQDs not only can improve the photogenerated electron–hole pair’s separation, but also can increase light harvesting by the up-conversion photoluminescence behavior. Moreover, the as-prepared C0.50%/CN sample also exhibited excellent photostability and recyclability for both photodegradation of RhB and TC-HCl. In addition, the possible enhanced photocatalytic mechanism was proposed and analyzed by the active species trapping experiments. This work will bring about potential for application in environmental purification and useful for designing other CQDs-based photocatalyst in energy conversion.
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高影响因子
Nanoscale Research Letters
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2016
·Vol. 11
·期 1
·1-9
·
IF 2.584
Gao Qiqian,Sun Shihan,Li Xuesong,Zhang Xueyu,Duan Lianfeng,Lü Wei
In present work, two-dimensional g-C 3 N 4 was used to modify TiO 2 nanorod array photoanodes for CdS quantum dot-sensitized solar cells (QDSSCs), and the improved cell performances were reported. Single crystal TiO 2 nanorods are prepared by hydrothermal method on transparent conductive glass and spin-coated with g-C 3 N 4 . CdS quantum dots were deposited on the g-C 3 N 4 modified TiO 2 photoanodes via successive ionic layer adsorption and reaction method. Compared with pure TiO 2 nanorod array photoanodes, the g-C 3 N 4 modified photoanodes showed an obvious improvement in cell performances, and a champion efficiency of 2.31 % with open circuit voltage of 0.66 V, short circuit current density of 7.13 mA/cm 2 , and fill factor (FF) of 0.49 was achieved, giving 23 % enhancement in cell efficiency. The improved performances were due to the matching conduction bands and valence bands of g-C 3 N 4 and TiO 2 , which greatly enhanced the separation and transfer of the photogenerated electrons and holes and effectively suppressed interfacial recombination. Present work provides a new direction for improving performance of QDSSCs.
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PubMed
高影响因子
BIOSENSORS & BIOELECTRONICS
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2016
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IF 7.476
Shuisheng Hu,Wenjun Ouyang,Longhua Guo,Zhenyu Lin,Xiaohua Jiang,Bin Qiu,Guonan Chen
A fluorescent biosensor for ochratoxin A was fabricated on the basis of a new nanocomposite (Fe 3 O 4 /g-C 3 N 4 /HKUST-1 composites). Fe 3 O 4 /g-C 3 N 4 /HKUST-1 was synthesized in this work for the first time, which combined HKUST-1 with g-C 3 N 4 to improve its chemical stability. Fe 3 O 4 /g-C 3 N 4 /HKUST-1 composites have strong adsorption capacity for dye-labeled aptamer and are able to completely quench the fluorescence of the dye through the photoinduced electron transfer (PET) mechanism. In the presence of ochratoxin A (OTA), it can bind with the aptamer with high affinity, causing the releasing of the dye-labeled aptamer from the Fe 3 O 4 /g-C 3 N 4 /HKUST-1 and therefore results in the recovery of fluorescence. The fluorescence intensity of the biosensor has a linear relationship with the OTA concentration in the range of 5.0–160.0 ng/mL. The LOD of sensor is 2.57 ng/mL (S/N=3). This fluorescence sensor based on the Fe 3 O 4 /g-C 3 N 4 /HKUST-1 composites has been applied to detect OTA in corn with satisfying results.
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PubMed
高影响因子
SUPERLATTICES AND MICROSTRUCTURES
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2016
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IF 2.117
Fangmin Yan,Lianfeng Duan,Qiqian Gao,Jiao Men,Shihan Sun,Xueyu Zhang,Wei Lü
In spite of the great development in quantum dot sensitized solar cells (QDSSCs), enrichment of material system of QDSSCs is still imperial mission for further advances. In this report, two-dimensional graphitic carbon nitride (g-C 3 N 4 ) prepared from urea was applied to modify porous TiO 2 photoanodes , followed by the deposition of CdS and CdSe QDs as sensitizers. In the as-prepared photoanodes, g-C 3 N 4 functioned as barrier for retarding electron backward recombination and assisted to strengthen light absorption . Compared with the pure TiO 2 photoanode, the photoelectrical behaviors of g-C 3 N 4 modified TiO 2 photoanode were obviously improved. By optimizing the loading amount of g-C 3 N 4 , the champion performance was achieved at 15% addition amount of g-C 3 N 4 with shortcircuit current density of 15.1 mA cm −2 , open circuit voltage of 0.56 V, and energy conversion efficiency of 4.14% under AM 1.5 illumination. The improvement in cell performance was attributed to the type II alignment between g-C 3 N 4 and TiO 2 , which induced the fast separation of photogenerated carriers. The transfer of the photogenerated electrons and holes is driven by the conduction band offset of 0.39 eV and the valence band offset of 0.86 eV, respectively. Present results provided a new insight for further optimum photoanode structures of QDSSCs.
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高影响因子
CARBON
·
2016
·
IF 6.198
Kui Li,Xin Xie,Wei-De Zhang
Graphitic carbon nitride-based nanocomposites hold great promise in photocatalysis . In this study, nanocomposites based on graphitic carbon nitride-encapsulating carbon spheres (CS/g-C 3 N 4 ) were facilely fabricated through polymerization of melamine from the carbon spheres. The incorporation of carbon spheres in g-C 3 N 4 leads to enlarged contact area and strengthened interaction between the two π-conjugated components. The CS/g-C 3 N 4 composites exhibit large specific surface area, improved visible light utilization, more negative potential of conduction band , and enhanced separation of photo-generated charge carriers. The optimized CS/g-C 3 N 4 composite displays a hydrogen evolution rate of 50.2 μmol h −1 , which is almost 4.8 times of that over the pure g-C 3 N 4 . The structures and morphologies of the catalysts can be maintained after photocatalytic reaction. This approach may stimulate a new way to construct g-C 3 N 4 -based nanocomposites with other carbon materials.
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高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2017
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IF 9.446
Anye Shi,Huihui Li,Shu Yin,Bin Liu,Jiachi Zhang,Yuhua Wang
Single layer g-C 3 N 4 could be obtained from a protonic acid treatment of g-C 3 N 4 or a new sandwich-like orientation growth of melamine. Through the self-assembly of melamine and polyacrylamide by hydrogen bonds and electrostatic interactions, g-C 3 N 4 , with extended planarized atomic single layer, exhibits superiority in both photocatalytic hydrogen evolution and photocatalytic degradation under visible light irradiation. Besides low efficiency, the acid exfoliation will destroy the delocalized π-system by inducing O atoms. The decrease of conjugation degree increases the optical gaps, making it hard for g-C 3 N 4 to capture photons. On the contrary, the facile sandwich-like orientation growth of melamine highly keeps the conjugation degree of g-C 3 N 4 and extends its delocalized π-system. Such single layer g-C 3 N 4 is more active even better than N-doped TiO 2 under visible light irradiation.
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高影响因子
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