CHEMICAL ENGINEERING SCIENCE
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2019
·
IF 3.372
Fang Li,Dennis Y.C. Leung
A heterojunction structure of BiVO 4 coupled with a narrow bandgap photocatalyst Bi 2 S 3 was fabricated forming a composite material with strong capacity in visible light absorption and enhancement in the separation rate of photogenerated charge carriers owing to their suitable band structures. As a result, efficiency of hydrogen production through photoelectrocatalysis is highly enhanced. The morphology and composition of as-prepared sample electrodes are measured through X-Ray Diffraction (XRD), scanning electron microscopy (SEM), high resolution transmission electron microscopy (HR-TEM) and X-ray photoelectron spectroscopy (XPS). The performance of the hybrid nanostructure Bi 2 S 3 /BiVO 4 photoelectrode was found to be related to the growing process of Bi 2 S 3 nanowire during the hydrothermal preparation process. The composited Bi 2 S 3 /BiVO 4 photoanode achieved a photoconversion efficiency of 2.9% which is nearly 3-fold that of the bare BiVO 4 electrode under visible light irradiation, while the hydrogen production was greatly enhanced by nearly 5-fold in the photoelectrocatalytic hydrogen production reaction.
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高影响因子
ACS Sustainable Chemistry & Engineering
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2019
·
IF 6.97
Junfan Niu,Jingyue Tang,Gang Tang,Zhiyuan Zhou,Rong Tang,Jiale Yang,Na Jiang,Jianqiang Li,Yongsong Cao
Photosensitizers need to be activated by external light to achieve phototherapy. However, unsatisfactory tissue penetration of light and uncontrollable light intensity limit their application. To overcome the limitations, a novel fluorescent conjugate was developed by conjugating coumarin-functionalized nanosilica with acifluorfen to emit fluorescence as the supplementary light to activate protoporphyrin IX (PpIX, a photosensitizer in plant cell that can be induced by acifluorfen) for enhancing phototherapy activity. The results showed that the obtained conjugate could obviously increase the singlet oxygen yield of PpIX and exhibited remarkable photodynamic herbicidal activity against Amaranthus retroflexus. Under low light intensity, its photodynamic herbicidal activity was five to six times higher than that of acifluorfen sodium salt. The conjugate could move upward and downward freely in vascular system of Brassica juncea seedlings and significantly reduced the cytotoxicity of acifluorfen. Moreover, the conjugate was proved to be safe to soybean at concentrations of 200–800 mg/L of acifluorfen. This study gives a novel drug delivery system with the potential of reducing light-dependent drug dosage and harm to nontarget organisms and offers a way to use fluorescent emission as the supplementary light to enhance the phototherapy activity of photosensitizers.
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EUROPEAN POLYMER JOURNAL
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2019
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IF 3.621
Xiaofeng Ma,Xiaoyu Lan,Linlin Wu,Lei Wang,Qun Gu,Yijun Shi,Xiaoli Gu,Zhenyang Luo
A series of well-defined random copolymers comprising butyl acrylate (BA) and 4-phenylazophenylmethacrylate (AzoMA) (P(AzoMA- r -BA)) are prepared successfully by reversible addition fragmentation chain transfer (RAFT) polymerization. P(AzoMA- r -BA)s show LCST-type phase transition in 1-butyl-3-methylimidazolium bis(trifluoromethanesulfone)amide ([C 4 mim][NTf 2 ]). LCST depends on the photoisomerization state of azobenzene, as well as on the AzoMA composition in the random copolymers. LCST of (P( cis -AzoMA- r -BA) is significantly higher than that of P( trans -AzoMA- r -BA), because cis -AzoMA and trans -AzoMA behave as solvato-philic and solvato-phobic comonomer, respectively. At a bistable temperature, photo-induced phase separation is completely reversible. Secondly, based on this phenomenon, a thermo-/photo- responsive ion gel (BA-AzoMA ion gel) can be prepared by free radical polymerization of BA and AzoMA using ethylene glycol dimethacrylate (EGDMA) as crosslinker in [C 4 mim][NTf 2 ]. BA-AzoMA ion gel shows high temperature contraction and low temperature expansion behavior, due to LCST-type phase behavior of polymer system consisting of AzoMA and BA. Contraction temperature of BA-AzoMA ion gel depends on photoisomerization state of the azobenzene group in polymers. At a bistable temperature, photo-induced expansion-contraction is reversible. Finally, a Photo-induced actuator can be realized using BA-AzoMA ion gel at suitable temperatures, featuring reversible bending by alternate irradiating with visible and UV light. The bending behavior is also demonstrated.
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Biomaterials Science
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2019
·Vol. 8
·期 1
·391-404
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IF 5.251
Guannan Zhang,Xingyu Zhang,Yongqiang Yang,Ruifang Chi,Jing Shi,Ruiqiang Hang,Xiaobo Huang,Xiaohong Yao,Paul K. Chu,Xiangyu Zhang
Prevention of bacterial infection and promotion of osseointegration are two important issues for titanium (Ti) implants in medical research. In addition, after a biofilm is formed on the surface of implants, the immune system and antibiotic therapy may fail. In this work, bio-functionalized titanium dioxide (TiO2)/molybdenum disulfide (MoS2)/polydopamine (PDA)/arginine-glycine-aspartic acid (RGD) nanorod arrays (NAs) are prepared on Ti implants to not only kill bacteria noninvasively upon co-irradiation of 660 nm visible light (VL) and 808 nm near infrared (NIR) light, but also promote the osteogenic activity simultaneously. Dual light irradiation triggers the TiO2/MoS2 NA to generate hyperthermia and reactive oxygen species (ROS) in 10 min. The synergistic effects of the generated hyperthermia and ROS increase the bacterial membrane permeability and bacteria are killed rapidly and efficiently in vitro and in vivo. The biofilm is also eradicated and RGD on the nanorods improves cell adhesion, proliferation, and osteogenic differentiation. The strategy described here for the design of bio-functionalized coatings on Ti implants has great clinical potential in orthopedics, dentistry, and other medical fields.
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PubMed
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2019
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IF 3.375
Qian Chen,Yi Feng,Rongrong Tian,Jinghang Chen,Anqing Wang,Jianfeng Yao
Photosensitization is a promising way to make UiO-66 visible light responsive. In this work, zirconium (Zr) precursors and synthetic methods (solvent-assisted or nonsolvent-assisted) were found to significantly affect the electric charge and the defect sites of UiO-66. UiO-66 with enhanced adsorption and photosensitized photocatalytic ability was then obtained. When ZrOCl2·8H2O was applied as Zr-precursor in a nonsolvent method, defect rich UiO-66 (UiO–OCl–N) was achieved with higher Cr(VI) adsorbing ability and improved photosensitized photocatalytic ability. Moreover, with the coexistence of Rhodamine B in Cr(VI) solution, photocatalytic performance of UiO-66 can be further enhanced.
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高影响因子
ACS Applied Nano Materials
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2019
·
IF 0
Hongxiang Zhang,Chunxia Wu,Canran Zhang,Bisheng Yan,Jiyuan Guo,Gangyi Zhu,Jun Dai
In this paper, we report the dual-wavelength green-light emission from zinc oxide (ZnO)-nanoseed-decorated p-GaN (gallium nitride)/n-ZnO nanorod/CsPbBr3 quantum dots (QDs) light-emitting diodes (LEDs). At the same time, the effect of ZnO nanoseeds on the p-GaN/n-ZnO nanorod/CsPbBr3 QDs LED performance is deeply studied. ZnO nanoseeds were fabricated by magnetron sputtering and the sol–gel method; then ZnO nanorods were obtained on GaN by hydrothermal treatment to form the p-GaN/n-ZnO nanorod heterojunction, and green CsPbBr3 QDs were further deposited on ZnO nanorod arrays to realize LEDs. The results show that magnetron-sputtering ZnO nanoseeds can induce regular vertical ZnO nanorod arrays, and the corresponding device presents a better electroluminescence (EL) performance. The X-ray diffraction, atomic force microscopy, and EL mechanisms indicate that the p-GaN/n-ZnO nanorod with magnetron-sputtering ZnO nanoseeds has a better crystalline interface. Our results indicate that the p-GaN/n-ZnO nanorod/CsPbBr3 QDs heterojunction structure can be served as dual-wavelength LEDs, and magnetron-sputtering ZnO nanoseeds can give rise to a better EL performance.
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NANO
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2019
·
IF 1.293
Jianhua Ge,Jing Xu,Yujie Liu,Long Zhang,Lan Wang,Dehan Wu
Nitrogen photo fixation mediated by various photocatalysts has received extensive concerns in recent years. In this work, a general strategy is proposed to enhance nitrogen photo fixation performance with some W 1 8 O 4 9 -based photocatalysts under visible-light irradiation. A series of photocatalysts were successfully synthesized in the presence of some noble-metal-free transition metals (Fe, Co and Ni) to modify the urchin-like W 1 8 O 4 9 . The resulting photocatalysts were systematically characterized using XRD, SEM, EDS, XPS, PL, N 2 adsorption–desorption isotherms, and DRS. Structural characterization of the photocatalysts revealed that the crystal morphology features were preserved, optional harvesting properties were enhanced, BET specific surface area was extended, and migration efficiency of the photo-induced charge carriers was significantly improved in the modified-W 1 8 O 4 9 materials. Therefore, a progressed nitrogen photo fixation performance was observed. The maximum production of NH 4 + was approximately reached to 2752 μ g ⋅ g − 1 catal. under the optimum reaction conditions. Furthermore, a plausible nitrogen photo fixation mechanism in the presence of the synthesized composites is also proposed.
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高影响因子
CHINESE JOURNAL OF CHEMISTRY
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2019
·Vol. 38
·期 1
·87-90
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IF 2.376
Simin Hou,Shumei Chen,Jian Zhang,Lei Zhang
Summary of main observation and conclusion In order to extend the absorption spectrum of polyoxo-titanium clusters into the visible region, two new heterometal-oxo clusters Ti 4 Cu II 2 Cu I 2 (μ 3 -O) 6 (benzoate) 10 (MeCN) 4 ( PTC-153 ) and Ti 4 Cu II 2 Cu I 2 (μ 3 -O) 6 (benzoate) 8 (CH 3 COO) 2 (MeCN) 4 ( PTC-154 ) were successfully synthesized. Single-crystal X-ray diffraction and X-ray photoelectron spectroscopy studies showed that these two heterometallic Ti 4 Cu 4 -oxo clusters possessed Chinese knot-shape structure and mixed valence Cu 1+/2+ ions. UV-visible spectroscopy analysis demonstrated that the visible light region absorption of PTC-153 and PTC-154 could be significantly enhanced by doping copper. Furthermore, their visible-light driven photocurrent responses were studied by using samples of PTC-153 and PTC-154 as electrode precursors.
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高影响因子
ACS Sustainable Chemistry & Engineering
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2019
·
IF 6.97
Tengfei Li,Haoran Wei,Hanzhong Jia,Tianjiao Xia,Xuetao Guo,Tiecheng Wang,Lingyan Zhu
The application of Ag3PO4 as a commonly used photocatalyst is limited by its high recombination potency and electron–hole pairs with weak redox potential. It is significant to enhance the photocatalytic activity of Ag3PO4 by coupling with a wide band gap semiconductor. In this study, Ag2WO4 was selected to promote the photocatalysis of Ag3PO4 giving that it has wide band gap energy and strong redox potential. A facile chemical precipitation method was applied to assemble Ag2WO4 nanoparticles on the surface of Ag3PO4 to form an Ag2WO4/Ag3PO4 heterojunction. The Ag2WO4/Ag3PO4 heterojunction containing 7.5% molar mass of WO42– (7.5W) displayed the most superior photocatalytic efficiency under simulated solar light irradiation: 93% of bisphenol A was degraded just within 10 min and above 75% was mineralized within 30 min. The degradation reaction rate constant was 3 times higher than that of the pure Ag3PO4. The excited high-level-energy electrons on the conduction band of Ag3PO4 would transfer thermodynamically to the conduction band of Ag2WO4, and the generated valence band holes on Ag2WO4 easily shifted to the low-energy valence band of Ag3PO4, resulting in high separation of electron–hole pairs. The photogenerated holes and superoxide radical species played predominant roles in the reaction system.
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高影响因子
CATALYSIS COMMUNICATIONS
·
2019
·
IF 3.674
Xu Yan,Ziyang Wu,Peipei Yang,Yanli Mao,Biao Liu,Yong Zhao,Hao Shen,Dongliang Wang
In this article, novel Bi 2 S 3 /Bi 4 O 5 I 2 heterojunction was synthesized by a facile ion-exchange method with thioacetamide as sulfur source. Multiple techniques were employed to analyze the structure and chemical composition of prepared samples. The photocatalytic performance of the Bi 2 S 3 /Bi 4 O 5 I 2 heterojunction samples was investigated by the photodegradation of methyl orange under visible light. The Bi 2 S 3 /Bi 4 O 5 I 2 heterojunction of S/BOI-2 sample presented the highest activity constant among all samples. Additionally, the photocatalytic mechanism is proposed according to the trapping experiments and electron spin resonance (ESR) results.
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2019
·Vol. 43
·期 6
·2752-2757
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IF 3.069
Xinyu Cui,Wenlong Cheng,Mingdong Dong,Xiaojun Han
Controlled drug release is a promising technique that is used in the treatment of cancer. Herein, drug nanocarriers were developed based on Fe3O4@mSiO2 (mesoporous silica-coated Fe3O4) nanoparticles (NPs) gated by a lipid bilayer. The nanocarriers exhibited near-infrared (NIR) light-stimulated drug release in a remote and stepwise pattern. Mesoporous silica surrounds Fe3O4 NPs and ensures high drug capacity and easy modification of the lipid bilayer. Heat generated from the Fe3O4 NPs upon NIR irradiations increases the permeability of the lipid bilayer, which in turn causes drug release. Based on in vitro experiment results, DOX-loaded nanocarriers exhibited the highest cell death percentage of 75.7% with NIR laser irradiation for 5 min at the doxorubicin (DOX) dose of 10 μg mL−1. Because of the flexible and precise control of NIR laser, the nanocarriers have great potential in cancer treatment.
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Advanced Healthcare Materials
·
2019
·Vol. 8
·期 10
·1801534
·
IF 6.27
Chenyi Tang,Chao Liu,Yu Han,Qiaoqi Guo,Wei Ouyang,Huajun Feng,Meizhen Wang,Feng Xu
The widespread use of antibiotics has caused the rapid emergence of antibiotic-resistant bacterial strains and antibiotic resistance genes in the past few decades. Photocatalytic inactivation, a promising approach for the killing of pathogens, efficiently avoids the problems induced by antimicrobial drugs. However, traditional photocatalysts usually have some disadvantages, such as high costs of raw materials, ultraviolet ray excitation, and potential leaching of toxic metals. Here, a metal-free heterojunction photocatalyst, denoted as CQDs/g-C 3 N 4 , is synthesized through incorporating carbon quantum dots (CQDs) on graphitic carbon nitride (g-C 3 N 4 ), which significantly enhances photocatalytic inactivation of Staphylococcus aureus ( S. aureus ) compared with pure g-C 3 N 4 in vitro. CQDs/g-C 3 N 4 causes a rapid increase of intracellular reactive oxygen species levels and destruction of cell membranes under visible light, eventually leading to death of bacteria. The efficacy of CQDs/g-C 3 N 4 is further examined by a mouse cutaneous infection model of S. aureus . CQDs/g-C 3 N 4 markedly reduces the bacterial loads and prompts lesion recovery in mice, as compared with g-C 3 N 4 -treated group. In vivo and in vitro toxicity analyses show that the side effects of CQDs/g-C 3 N 4 are negligible. Considering the efficient photocatalytic inactivation and nontoxicity of CQDs/g-C 3 N 4 , this visible-light-driven photocatalyst paves a brand new avenue for the treatment of S. aureus infection.
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PubMed
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