Journal of Inorganic and Organometallic Polymers and Materials
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2020
·Vol. 31
·期 1
·375-383
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IF 1.941
Xu Gengsheng,You Fangfang,Li Xu
Considering the accelerated charge/mass transfer and the formation of active defects at the heterointerface, La-ZnO/g-C 3 N 4 heterogeneous photocatalysts were facilely prepared via a two-step route consisting of hydrothermal and calcination processes in this work. The combination of La 3+ doping in ZnO and the contact between La-ZnO and g-C 3 N 4 endowed the heterogeneous composite with a much enhanced photocatalytic activity towards methyl blue (MB) dye decolorization under the visible light irradiation. It was found that La-ZnO/g-C 3 N 4 -4.6 showed an optimal degradation rate of MB (8.72 × 10 − 2 min − 1 ), which is 14 times higher than that of pure g-C 3 N 4 (6.23 × 10 − 3 min − 1 ) under the same experimental conditions. The improved photocatalytic MB decolorization is attributed to the increased interfacial electron-hole separation efficiency through constructing La-ZnO/g-C 3 N 4 heterogeneous interfaces. The present study manifests the advantage of heterogeneous interfaces as the charge carrier separation pathway towards boosting photocatalytic activity.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2020
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IF 7.489
Qian Wang,Dandan Zhang,Jin Feng,Tingli Sun,Cailing Li,Xiaobao Xie,Qingshan Shi
Antibiotic pollution has been a serious global public health concern in recent years, photodynamic inactivation is one of the most promising and innovative methods for antibacterial applications that avoids antibiotic abuse and minimizes risks of antibiotic resistance . However, limited by the weak interaction between the photosensitizers and Gram-negative bacteria, the effect of photodynamic inactivation cannot be fully exerted. Herein, photosensitizer chlorin e6-loaded polyethyleneimine-based micelle was constructed. The synergy of electrostatic and hydrophobic interactions between the nanoparticles and the bacterial surface promoted the anchoring of nanoparticles onto the bacteria, resulting in enhanced photoinactivation activities on Gram-negative bacteria. As expected, an eminent antibacterial effect was also observed on the Gram-positive bacteria Staphylococcus aureus . The cellular uptake results showed that photosensitizer was firmly anchored to the bacterial cell surface of Escherichia coli or Staphylococcus aureus by the introduction of branched polyethylenimine-containing nanoparticles. The light-triggered generation of reactive oxygen species , mainly singlet oxygen, from the membrane-bound nanoparticles caused irreversible damage to the bacterial outer membrane, achieving enhanced bactericidal efficiency than free photosensitizer. The study would provide an efficient and promising antimicrobial alternative to prevent overuse of antibiotics and have enormous potential for human healthcare and the environment remediation.
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JOURNAL OF HAZARDOUS MATERIALS
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2020
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IF 9.038
Junzhuo Liu,Huijie Zhang,Liying Yan,Philip G. Kerr,Songhe Zhang,Yonghong Wu
Silver nanoparticles (AgNPs) including a mix of intact nanoparticle-Ag and ‘free’ Ag + pose high risks to benthic photoautotrophs, but the photosynthetic responses of benthic microbial aggregates to AgNPs still remain largely unknown. Here, periphyton and Nostoc were used to elucidate the photosynthetic responses of benthic algae community to intact nanoparticle-Ag and Ag + . During exposure, both intact nanoparticle-Ag and Ag + imposed negative effects on photosynthesis of benthic algae, but via different pathways. Specifically, Ag + had stronger effects on damaging the oxygen-evolving complex (OEC) and thylakoid membrane than intact nanoparticle-Ag. Ag + also suppressed electron transfer from Q A to Q B , and impaired phycobilisome. Intact nanoparticle-Ag inhibited the expression of PsbD and PsbL in PSII, but prompted the ROS scavenging capacity. In response to the stress of AgNPs, the benthic algae increased light energy absorption to maintain the electron transport efficiency, and up-regulated PSI reaction center protein (PsaA) to compensate the degraded PSII. These results reveal how intact nanoparticle-Ag and Ag + influence electron transport, energy conversion and protein expression in the photosynthesis of periphyton, and provide deep insights into the responses of benthic photoautotrophs to different components of AgNPs.
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SURFACE & COATINGS TECHNOLOGY
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2020
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IF 3.784
Yuxin Song,Jihui Lang,Jiale Guo,Qi Zhang,Qiang Han,Hougang Fan,Ming Gao,Maobin Wei,Jinghai Yang,Zifeng Sheng
A carbon cloth@TiO 2 @Ag (CC@TiO 2 @Ag) membrane has been prepared by two-step method, including the hydrothermal method to make TiO 2 grow on carbon cloth and the photodeposition method to synthesize Ag element on CC@TiO 2 for oil-water separation. The obtained CC@TiO 2 @Ag membrane shows the good superhydrophilicity and underwater superoleophobicity due to its hierarchical broccoli-like interface with the good surface roughness and the natural hydrophilicity of TiO 2 . Importantly, the resultant membrane exhibits a strong self-cleaning ability under visible light irradiation of CC@TiO 2 @Ag membrane with loading a certain amount of Ag, so that the separation efficiency remains above 99% even after 60 cycles for various oil-water mixtures. Moreover, the CC@TiO 2 @Ag membrane is flexible and durable. The high separation efficiency and excellent self-cleaning ability of the membrane may own the broad application prospects in the field of oil-water separation.
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OPTICAL MATERIALS
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2020
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IF 2.779
Lin Chen,Jingxia Zheng,Qin Du,Yongzhen Yang,Xuguang Liu,Bingshe Xu
Orange-emissive carbon dot (o-CDs) phosphors were prepared to reduce the correlated color temperature and increase the color rendering index of carbon dots (CDs)-based white light-emitting diode (WLED) devices. 2,7-dihydroxynaphthalene was selected as the carbon source and N, N -dimethylformamide was used as the nitrogen source to synthesize nitrogen doped o-CDs with wide and double-peak emission spectrum . Warm WLED device was designed by taking o-CDs as phosphors and excited by a UV chip. Results showed that o-CDs have a fluorescence quantum yield of 26.03%, their emission spectrum is wide enough to range from 480 to 680 nm, and show good photo and thermal stability, which is quite suitable for warm WLED phosphors. o-CDs based WLED device emits warm white light with a color coordinate of (0.41, 0.39) and a correlated color temperature of 3330 K. Compared with the current warm WLEDs devices based on CDs, their color rendering index reaches a high level, which is 91. This study provides a new idea for broadening the application of CDs in warm WLEDs that used in indoor lighting.
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LWT-FOOD SCIENCE AND TECHNOLOGY
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2020
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IF 4.006
Liumin Fan,Xiao Liu,Xiuping Dong,Shanshan Dong,Qisen Xiang,Yanhong Bai
Ultraviolet light-emitting diodes (UV-LEDs) have become widespread for decontaminating the surfaces of food products and their packaging as a safer alternative to traditional mercury-vapor based UV lamps. This study aimed to investigate the effect of UVC- LEDs (275 nm) on the inactivation of foodborne pathogens and quality attributes of raw tuna fillets. Raw tuna fillets inoculated with cocktails of Salmonella Typhimurium, Listeria monocytogenes , and Escherichia coli O157:H7 were exposed to UVC-LEDs at 500-4000 mJ/cm 2 . UVC-LED treatments of single-layer tuna fillets at a dose of 4000 mJ/cm 2 resulted in 1.31-, 1.86-, and 1.77- log reduction of S . Typhimurium, L . monocytogenes , and E . coli O157:H7, respectively. The pH value, water-holding capacity, metmyoglobin, texture, and color characteristics of tuna fillets were not significantly ( p > 0.05) changed following the UVC-LED treatment at radiation doses up to 4000 mJ/cm 2 . Nonetheless, the UVC-LED irradiation led to increased levels of lipid oxidation in tuna fillets. Overall, the present study demonstrates that UVC-LEDs are a promising technology to reduce microbial flora and maintain the physicochemical properties of fish products.
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Polymer-Plastics Technology and Materials
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2020
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IF 0
Haoyuan Wang,Siqi Yang,Xiaotian Li,Fanghong Yang,Xiaopeng Sun,Wenfei Li,Zhanhai Yao
Modern agriculture needs multifunctional greenhouse films to meet different needs. A novel method for improving light converting properties and wettability of polyethylene film was developed in this paper. Glycerin monostearic acid itaconic acid diester (GI) with a carboxyl group and double band was synthesized. Rare earth complex Eu(GI)3Phen with Eu3+ as central ion has been obtained. Subsequently, a simple strategy of grafting it onto LLDPE backbone was employed to delay the migration of Eu(GI)3Phen. The fluorescence spectrum indicated that the modified film emitted red light. Meanwhile, the accelerated dripping time of modified film was extended to 12 days.
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Catalysts
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2020
·Vol. 10
·期 10
·1126
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IF 3.52
Jun Liu,Xuli Li,Haobo Hou,Min Zhou
To further boost the charge separation and photocatalytic activity of TiO2under visible light, the anatase–rutile mixed-phase nitrogen-doped (N-doped) TiO2nanoparticles were successfully synthesized through a facile one-step calcining procedure using TiN as raw materials. The crystal phases, morphologies, chemical compositions, textural structures, and optical properties of as-obtained N-doped TiO2were characterized by the corresponding analytical techniques. The photocatalytic activities of as-fabricated samples were evaluated by degrading 4-chlorophenol (4-CP) and methylene blue (MB) aqueous solution under visible light irradiation. The results revealed that the ratio of rutile to anatase increased with the improvement of sintering temperature, and the sample prepared at 500 °C had the best photocatalytic activity. This might be because it possessed the most appropriate rutile/anatase proportion as well as the nitrogen doping. The transient photocurrent responses, photoluminescence spectra (PL) measurements, and active species trapping experiments were implemented to disclose the photocatalytic mechanism. This work will provide a further insight into the synthesis of highly efficient N-doped TiO2photocatalysts for organic contaminant removal.Keywords:N-doped TiO2;charge separation;photocatalytic activity
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APPLIED SURFACE SCIENCE
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2020
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IF 6.182
Qing Cheng,Wulin Yang,Qingling Chen,Jiajun Zhu,Deyi Li,Licai Fu,Lingping Zhou
Maintaining a highly negative value of conduction band (CB) potential of photocatalysts through metal doping has been a great challenge. Herein, we investigated the effects of Fe-doping on the crystal structures and electronic structures of zirconia (ZrO 2 ) in detail by combining experiments and Density Functional Theory (DFT). It was revealed that the Fe-doping obviously triggered the formation of tetragonal phase ZrO 2 and induced a defect states in the bandgap of Fe-doped ZrO 2 . Due to the coherent effect between the electrons of the Fe 3 d orbitals and ZrO 2 intrinsic electronic states, the defect states expanded the light absorption edge of ZrO 2 and Fe-doped ZrO 2 showed a small bandgap with maintaining a highly negative value of the CB potential. Meanwhile, Fe-doping significantly enhanced photoelectrochemical properties, the efficiency separation of electron-hole pairs and photocatalytic activity in comparison with the pristine ZrO 2 . We also found that 0.5%Fe-ZrO 2 exhibited the optimum photocatalytic performance, and reached 96% for degradation of Rhodamine B (RhB) within 150 min under visible light irradiation. This work elucidated the mechanism of the photocatalytic degradation of RhB over Fe-doped ZrO 2 and provided a promising approach in designing highly negative CB potential of ZrO 2 via Fe doping toward sustainable environmental remediation.
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Scientific Reports
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2020
·Vol. 10
·期 1
·1-12
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IF 3.998
Liu Wen,He Tianpei,Wang Yonghong,Ning Ge,Xu Zhenggang,Chen Xiaoyong,Hu Xinjiang,Wu Yaohui,Zhao Yunlin
Norfloxacin (NOF) is an environmentally harmful and ubiquitous aquatic pollutant with extensive production and application. In this study, a novel composition named carbon-based composite photocatalytic material of zinc oxide and zinc sulphide (ZnO/ZnS@BC) was successfully obtained by the impregnation-roasting method to remove NOF under UV-light. Scanning electron microscopy, X-ray photoelectron spectroscopy, transmission electron microscopy and energy dispersive spectrometer characterised the composition. ZnO/ZnS was successfully decorated on the surface of biochar (BC). The pH, the ZnSO 4 /PS ratio, and ions and quenchers, were investigated. High removal efficiency was obtained with a pH of 7 and a ZnSO 4 /PS ratio of 1:1, and the removal ratio of NOF reached 95% within three hours; the adsorption and degradation ratios reached 46% and 49%, respectively. Fe 2+ promoted the degradation of NOF, whereas other ions inhibited it, with NO 3 − showing the strongest inhibitory effect. Three reactive species (tert-butanol, quinone, and ammonium oxala) were identified in the catalytic system. The decreasing order of the contribution of each reactive species was: O 2 − > ·OH − > h + . Additionally, a recycling experiment demonstrated the stability of the catalyst; the catalytic degradation ratio of NOF reached 78% after five successive runs. Therefore, ZnO/ZnS@BC possessed strong adsorption capacity and high ultraviolet photocatalysis ability.
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CHEMICAL ENGINEERING JOURNAL
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2020
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IF 10.652
Lu Zhang,Meng Zhang,Xiaozhe Song,Hui Wang,Zhaoyong Bian
Here, we report enhancement of the photoelectrochemical (PEC) performance of MnO x /graphite-like carbon nitride (g-C 3 N 4 ) nanocomposites synthesized by one-step thermal decomposition for degradation of clofibric acid (CA). MnO x showed enhanced broadband ultraviolet–visible light regions, efficient charge generation–separation, and enhanced PEC performance when combined with g-C 3 N 4 . Photogenerated holes can be efficiently captured by introducing Mn 2+ /Mn 3+ /Mn 4+ valence band transitions. In addition to a good visible-light response, the MnO x /g-C 3 N 4 -10 (g-C 3 N 4 with 10% Mn(NO 3 ) 2 ·6H 2 O) photoanode showed enhanced photocurrent density of 0.03 × 10 −3 A cm −2 at 0.63 V vs. Ag/AgCl, which was approximately 100 times that of pristine g-C 3 N 4 . The superoxide radical and positive holes played dominant roles in PEC degradation of CA. The MnO x /g-C 3 N 4 -10 photoanode showed the highest photoelectrocatalytic performance under acidic conditions because of electrostatic attraction between the electrode and CA. The CA degradation ratio using the MnO x /g-C 3 N 4 -10 photoanode was 100% under visible light in 6 h at pH = 3. This work provides a simple and sustainable strategy to modify g-C 3 N 4 for captured holes to improve PEC degradation of CA, and it is promising for application to different materials in a variety of fields.
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ORGANIC ELECTRONICS
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2020
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IF 3.31
Rongmei Yu,Furong Yin,Chunying Pu,Haizhen Song,Xiumei Xu,Han Zhang,Wenyu Ji
Although much effort has been made to the cadmium-free quantum dot light emitting diodes (QLEDs), it is still a big challenge to achieve an efficient eco-friendly QLED. Here, an extremely efficient QLED based on Ag–In–Zn–S QDs is constructed with the insertion of an 1,3,5-tris(N-phenylbenzimidazole-2-yl)benzene (TPBi) hole-spacing interlayer. The electrical properties of single carrier devices demonstrate the TPBi blocks the hole injection, leading to a more balanced charge injection in the device. Transient electroluminescence measurements confirm that the hole accumulation adjacent QDs is dramatically suppressed after the insertion of TPBi, hence limiting the interactions between excitons and holes. Consequently, the peak current (power) efficiency of 6.0 cd/A (6.5 lm/W) is achieved. To the best of our knowledge, this is the record efficiency for the Ag–In–Zn–S QLEDs reported to date. We anticipate this work will provide a new route for optimizing the performance of Cd-free QLEDs.
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