ACS Applied Materials & Interfaces
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2018
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IF 8.097
Qiuwen Wu,Gen Wei,Zhuobin Xu,Jing Han,Juqun Xi,Lei Fan,Lizeng Gao
Infections caused by bacteria are a growing global challenge for public health as bacteria develop resistance, which will cause the failure of anti-infective treatment eventually. An effective alternative strategy to traditional antibacterial therapy is utilizing reactive oxygen species (ROS) to kill bacteria. Here, we report a simple route to prepare PEGylated nitrogen-doped carbon capsules (PEG-N-CCs) as an antibacterial agent. The PEG-N-CCs can translate near-infrared light (NIR) into heat and produce a high concentration of ROS triggered by NIR irradiation. Both heating and ROS are critical to destroy the outer membranes and rupture cell bodies, causing DNA fragmentation and glutathione oxidation both in Gram-negative Escherichia coli, Gram-positive Staphylococcus aureus, and their multidrug-resistant strains. Moreover, PEG-N-CCs plus NIR irradiation can efficiently scavenge the existing biofilms and prevent the formation of new biofilms, killing planktonic bacteria as well as those within the biofilm. Our studies prove that the PEG-N-CCs plus NIR irradiation can provide a simple and effective platform for combating bacteria, employing carbon nanomaterials as an antibacterial alternative for treatment of infectious diseases.
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IRANIAN POLYMER JOURNAL
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2018
·Vol. 27
·期 11
·881-887
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IF 1.278
Zeng Le-Lin,Xie Wan-Yun,Yang Cai-Xia,Liang Enxiang,Wang Guo-Xiang
In this study, a novel photocatalyst, pentarylenebis(dicarboximide) dye: (1,6,13,18-tetra(4-(2,3,3-trimethylbut-2-yl)phenoxy)- N,N ’-(2,6-diisopropylphenyl)-pentarylene-3,4,15,16-tetracarboxidiimide) (TTPDPT), was first used in metal-free photoinduced atom transfer radical polymerization (ATRP) of methyl methacrylates (MMA). The initiator was methyl α-bromoisobutyrate (MBI) and the light source was mild near-infrared (NIR) light irradiation ( λ max ≈ 870 nm). The TTPDPT-mediated ATRP relies on in situ photoreduction of a MBI through an electron transfer process to generate the desired alkyl radical, which could induce polymerization of the monomer. The photoinduced metal-free ATRP of MMA shows typical characteristics of controlled free radical polymerization, showing the linear evolution of number-average molecular weight ( M n,GPC ) with monomer conversion, where polymers with predetermined degree of polymerization have well-controlled molecular weights and narrow molecular weight distribution ( M w / M n ). The photoinduced metal-free ATRP of MMA can be carried out with just ppm level of TTPDPT. The polymerization initiation and propagation can be operated by the aid of pulsed light sequences while NIR light source was used to promote carbon–carbon bond formation and to produce poly(methyl methacrylate) (PMMA) with M w / M n as low as 1.5. The synthesized PMMA was characterized by 1 H nuclear magnetic resonance ( 1 H NMR). The resultant PMMA contained a bromide end group that can be employed to reinitiate styrene polymerization to produce block copolymers through chain extension experiments.
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MACROMOLECULES
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2018
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IF 5.914
Zhen Wang,Sen Yan,Huang-Chen Cui,Guang Cheng,Hui Ma,Qing-Mei Zhang,Qing-Pu Zhang,Jun-Min Liu,Bien Tan,Chun Zhang
A tetraphenylethylene-based oxacalixarene macrocycle (TOM) with high fluorescence quantum yield (70%) was used as monomer to construct a fluorescent macrocycle-based porous organic polymer (pTOM). With high surface area, specific pore size, and emissive properties, the blue-greenish fluorescent pTOM can be developed into white-light-emission materials by adsorbing guests of tris(bipyridine)ruthenium with complementary emission color by the Förster resonance energy transfer (FRET) effect.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2019
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IF 14.229
Fang Li,Wei Zhao,Dennis Y.C. Leung
Photoelectrocatalytic hydrogen production is a clean and sustainable way to combat energy crises and environmental issues. The performance of BiVO 4 which acts as a promising photoanode could be effectively enhanced by loading with Bi nanoparticles. In this study, a viable method to fabricate Bi/BiVO 4 electrode was proposed to enhance hydrogen production through a photoelectrocatalytic reaction. The results indicated that Bi nanoparticles loaded under optimal condition could obviously increase the photocurrent density of the BiVO 4 electrode from 0.9 mA cm −2 to 2.0 mA cm −2 under visible light illumination. Furthermore, the photoelectrochemical hydrogen production efficiency could have a 2.5-fold improvement with the addition of 20 ppm phenol. The possible mechanism of the enhanced performance and the function of phenol in the overall reaction was discussed.
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PROGRESS IN ORGANIC COATINGS
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2019
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IF 3.42
Lingli Ni,Cheng Zhu,Shizhong Zhang,Peng Cai,Aissam Airoudj,Laurent Vonna,Samar Hajjar-Garreau,Abraham Chemtob
Nano/micro structures are crucial for superhydrophobic surfaces, but rare are methods able to generate such dual structuring in a single step using a single precursor. We show that the visible light-controlled self-assembly of bis-silylated alkane precursors can create in one-step organosilica coatings exhibiting two levels of hierarchy: lamellae at nanoscale, and plate-like crystals at microscale. Crystallization rate can be precisely controlled by alkylene bridging group and irradiance. This allowed us to achieve superhydrophobic properties by the creation of a dense and uniform network of nanostructured microcrystals with high surface roughness. The obtained coatings displayed chemical stability, good thermal resistance and high mechanical strength through the cross-linked siloxane structure, which is essential for applications.
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MICROCHIMICA ACTA
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2019
·Vol. 186
·期 6
·1-8
·
IF 5.479
Zhang Yu,Xu Mengjiao,Gao Pan,Gao Wenkai,Bian Zhenfeng,Jia Nengqin
A photoelectrochemical (PEC) method was developed for the determination of dopamine. It is making use of a composite prepared from gold nanoparticles and TiO 2 (type P25) and placed on a fluorine-doped tin oxide (FTO) electrode. The composites are used for photoelectrical detection with improved electron transfer efficiency for photoproduction and with improved photoelectrical conversion efficiency. This is due to the excellent electrical conductivity and surface plasmon resonance absorption by gold nanoparticles, and also by the photocatalytic effect of TiO 2 . Dopamine binds easily to the surface of the composites and acts as an electron donor. This electrode gives a strongly enhanced photocurrent which increases linearly in the 0.1 to 100 μM dopamine concentration range and has a 23 nM detection limit (at S/ N = 3). The electrode was operated over 15 cycles of light-on and light-off states every 20 s under visible-light illumination, and the sensor indicates good stability. In addition, it is selective over several possible interferents including uric acid, L-cysteine, glutathione, ascorbic acid and glucose.
A new gold/P25 composite-based photoelectrochemical sensing scheme for dopamine is described. Under visible light irradiation, the photocurrent response is increased with the increasing concentration of dopamine (DA).
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Nanoscale Research Letters
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2019
·Vol. 14
·期 1
·1-9
·
IF 3.159
Liu Hanxin,Sun Chun,Gao Zhiyuan,Geng Chong,Shi Shuangshuang,Wang Le,Su Sijing,Bi Wengang
Perovskite quantum dots (QDs) have been widely used in white light-emitting diodes (WLEDs), due to their high quantum yield (QY), tunable bandgap, and simple preparation. However, the red-emitting perovskite QDs are usually containing iodine (I), which is not stable under continuous light irradiation. Herein, perovskite-based WLED is fabricated by lead-free bismuth (Bi)-doped inorganic perovskites Cs 2 SnCl 6 and less-lead Mn-doped CsPbCl 3 QDs, which emits white light with color coordinates of (0.334, 0.297). The Bi-doped Cs 2 SnCl 6 and Mn-doped CsPbCl 3 QDs both show excellent stability when kept in the ambient air. As benefits from this desired characteristic, the as-prepared WLED shows excellent stability along with operating time. These results can promote the application of inorganic perovskite QDs in the field of WLEDs.
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Environmental Progress & Sustainable Energy
·
2018
·Vol. 38
·期 2
·336-344
·
IF 1.326
Xueyan Li,Rong Yin,Yanyan Liu,Qingzhi Luo,Jing An,Desong Wang,Sijie Liu,Bo Dai
The ZnO/cyclized polyacrylonitrile (CPAN) composites were prepared by impregnation and heat treatment process. The morphology, crystal type, internal structure of ZnO/CPAN nanocomposites were characterized by UV-vis-diffuse reflectance spectroscope (DRS), X-ray diffraction, transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS). The visible light photocatalytic activity of ZnO/CPAN was evaluated by degradation of methyl orange under xenon lamp irradiation. The DRS results indicate that the absorption of ZnO/CPAN nanocomposites in the visible region was significantly higher than that of pure ZnO nanoparticles. The TEM results show that the surface of ZnO nanoparticles is occupied by the CPAN in small amount. The results of photocatalytic experiment show that the photocatalytic activity of ZnO nanoparticles can be improved significantly by the modification of CPAN. The possible photocatalytic mechanism was also discussed. © 2018 American Institute of Chemical Engineers Environ Prog, 38: 336–344, 2019
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2018
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IF 11.698
Weiyi Chen,Bin Han,Chen Tian,Xueming Liu,Shujie Liang,Hong Deng,Zhang Lin
Reducing carbon dioxide (CO 2 ) to various value-added chemical products by photocatalysis could effectively alleviate the serious problems of global warming and energy shortages. Currently, most commonly prepared photocatalysts present poor performance under visible light irradiation. In this study, we adopted a facile, scalable and controllable approach to prepare ultrathin two-dimensional (2D) porous Co 3 O 4 catalysts (Co 3 O 4 -NS) by air calcining of the ultrathin metal-organic framework (MOFs) nanosheet templates to validly reduce CO 2 with a Ru-based photosensitizer under visible light irradiation. Benefitting from the structural nature of MOFs precursors, the calcined Co 3 O 4 -NS inherit the morphology of 2D and well-developed porosity, which support the transport of electrons, enhance the adsorption of CO 2 molecules, and render abundant catalytic sites for CO 2 activation. As a result, the CO generation rate is approximately 4.52 μmol·h −1 with selectivity of 70.1%, which is superior to the Co 3 O 4 bulk catalysts (Co 3 O 4 -BK). Additionally, density functional theory (DFT) calculations reveal that the model of Co 3 O 4 monolayer has stronger CO 2 adsorption energy than that of the Co 3 O 4 bulk, which is beneficial for the CO 2 -to-CO conversion. This MOF-engaged strategy provides new insight into the controlled synthesis of advanced ultrathin holey nanosheets to improve the efficiency of photocatalytic CO 2 reduction.
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CHINESE CHEMICAL LETTERS
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2013
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IF 1.21
Wei Ma,Mei Meng,Xue Jiang,Bing-Tao Tang,Shu-Fen Zhang
A novel water-soluble macromolecular light stabilizer was synthesized by grafting 2-chloro-4,6-bis-[(2,2,6,6-tetramethylpiperidin-4-yl)amino]-1,3,5-triazine onto polyvinylamine. The intermediate 2-chloro-4,6-bis-[(2,2,6,6-tetramethylpiperidin-4-yl)amino]-1,3,5-triazine and the obtained macromolecular light stabilizer were characterized by 1 H NMR, HRMS, IR and UV spectroscopy. Cotton fabrics dyed with C.I. Reactive Yellow 145, C.I. Reactive Red 195 and C.I. Reactive Blue 19 were finished with the macromolecular light stabilizer, and the lightfastness of the dyes was tested. The results showed that the lightfastness of the reactive dyes was improved by 0.5–1.0 grade after being finished and the macromolecular light stabilizer exhibited good wash fastness and thermal stability.
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CHEMICAL ENGINEERING JOURNAL
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2013
·
IF 3.473
Jinyan Xiong,Gang Cheng,Fan Qin,Runming Wang,Hongzhe Sun,Rong Chen
A facile polyol-mediated solvothermal method was developed to fabricate BiOCl hierarchical nanostructures (HNs) with controllable morphologies. The obtained BiOCl hierarchical nanostructures were characterized by powder X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), UV–vis diffuse reflection spectroscopy (DRS) and nitrogen adsorption. The BiOCl hierarchical nanostructures (HNs) with ellipsoid-like, sphere-like and flower-like morphologies were constructed of intercrossed nanoflakes or nanosheets. The polyols played significant roles in the fabrication of BiOCl hierarchical nanostructures, which functioned as solvents, reducing and morphology-directing agents. Importantly, the BiOCl hierarchical nanostructures exhibited excellent shape-dependent visible-light-driven photocatalytic activities for Rhodamine B (RhB) degradation, which was much higher than that of 2D BiOCl nanosheets, nanoplates, commercial BiOCl and TiO 2 (anatase). The highly enhanced photocatalytic activities could be ascribed to the contributions of their hierarchical nanostructures, large BET surface areas, strong adsorption capacities and superhydrophilic properties.
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CHEMICAL ENGINEERING JOURNAL
·
2012
·
IF 3.461
Huanhuan Ji,Fei Chang,Xuefeng Hu,Wei Qin,Jiaowen Shen
Graphitic carbon nitride (g-C 3 N 4 ) was synthesized by directly thermal condensation of dicyandiamide and characterized by XRD, XPS, SEM, TEM and FT-IR. Then the as-prepared catalyst was employed to degrade priority pollutant 2,4,6-trichlorophenol (2,4,6-TCP) under visible light irradiation ( λ > 420 nm). The 2,4,6-TCP could be completely mineralized over g-C 3 N 4 , and the pseudo-first-order rate constant for 10 −4 M 2,4,6-TCP degradation was 0.70 h −1 in the presence of 1 g/L catalyst. O 2 - / OOH was identified as the most important reactive species contributing to 2,4,6-TCP degradation in air. Meanwhile, valence band holes (VB holes) of g-C 3 N 4 was observed to play important roles for the degradation of 2,4,6-TCP at N 2 gas ambient when metal ions were added as electron acceptors. The possible degradation pathway of 2,4,6-TCP was proposed.
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