Bioactive Materials
·
2020
·
IF 8.724
Yawei Ren,Yajing Han,Zhaoyang Li,Xiangmei Liu,Shengli Zhu,Yanqin Liang,Kelvin Wai Kwok Yeung,Shuilin Wu
Bacterial infection and related diseases are threatening the health of human beings. Photocatalytic disinfection as a simple and low-cost disinfection strategy is attracting more and more attention. In this work, TiO 2 nanoparticles (NPs) were modified by co-doping of Ce and Er using the sol–gel method, which endowed TiO 2 NPs with enhanced visible light photocatalytic performance but not pure ultraviolet photocatalytic properties compared the untreated TiO 2 . Our results disclosed that as the doping content of Er increased, the photocatalytic activity of modified TiO 2 NPs initially increased and subsequently decreased. The same trend occurred for Ce doping. When the doping dose of Er and Ce is 0.5 mol% and 0.2 mol%, the 0.5Ce0.2Ti–O calcined at 800 °C presented the best antibacterial properties, with the antibacterial efficiency of 91.23% and 92.8% for Staphylococcus aureus and Escherichia coli , respectively. The existence of Er ions is thought to successfully turn the near-infrared radiation into visible region, which is easier to be absorbed by TiO 2 NPs. Meanwhile, the addition of Ce ions can effectively extend spectral response range and inhibit the recombination of electrons and holes, enhancing the photocatalytic disinfection activity of co-doped TiO 2 .
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高影响因子
SN Applied Sciences
·
2020
·Vol. 2
·期 3
·1-10
·
IF 0
Sun Xueying,Liu Xinjie,Wang Jie,Jiang Xusheng,Liu Rongmei,Li Anran,Li Wen
In this work, we first successfully loaded the MOF structure Co-HKUST nanobundles on a foamed nickel without adding any binder. The Co-HKUST is a pseudo-capacitive material with excellent electrochemical performance as a unique energy storage material. As an electro-active material, such cobalt-based MOF exhibits superior pseudo-capacitive behavior in the KOH aqueous electrolyte with a high specific capacitance of 578.6 F g −1 at 1 A g −1 , and the specific capacitance remains 452.3 F g −1 when the current density increased to 10 A g −1 with a good rate performance (78.2%). Meanwhile, the cycle retention rate of the Co-HKUST is 88.7% after 1000 cycles at 7.5 A g −1 . The two-electrode asymmetric supercapacitor (ASC) device is also assembled in this work. The specific capacitance of Co-HKUST//AC ASC is 200.5 F g −1 at 1 A g −1 . Though 5000 cycles at 5 A g −1 , only 8.2% of the capacitance is lost. Energy density of asymmetric Co-HKUST//AC device can reach 71.35 Wh kg −1 at 1 A g −1 with a power of 809.9 W kg −1 . More interestingly, even if the current density increased to 10 A g −1 , the energy density maintains 44 Wh kg −1 at power density of 8.5 kW kg −1 . The above test results can fully show that the synthesized Co-HKUST material is a promising energy storage material.
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COLLOIDS AND SURFACES B-BIOINTERFACES
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2020
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IF 4.389
Xingwang Qie,Minghui Zan,Li Li,Ping Gui,Zhimin Chang,Mingfeng Ge,Ruo-Song Wang,Zhenzhen Guo,Wen-Fei Dong
Assessment of microbial viability plays a key role in human health protection. Optical imaging based on fluorescent dyes is a simple and convenient way to assess microbial viability. However, it is still a challenge to obtain stable, nontoxic and low-cost dyes. Herein, we prepared a nitrogen and phosphorus co-doped carbon nanodots (N, P-CDs) via a one-step solvothermal method. The prepared CDs possess plenty of functional groups and exhibit high stability, good biocompatibility, excellent photoluminescent and low toxicity. Especially, the properties of high quantum yield (89.9%) and highly negative surface charge (−41.9 mV) make the prepared N, P-CDs ideal materials for microbial differentiation. Compared with commercial dyes, our CDs are more stable, cost less, which can rapidly distinguish dead microorganisms from living ones with higher specificity.
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高影响因子
INORGANIC CHEMISTRY
·
2020
·
IF 4.825
Li Zhong,Junyang Ding,Xian Wang,Lulu Chai,Ting-Ting Li,Kongzhao Su,Yue Hu,Jinjie Qian,Shaoming Huang
The rapid development of suitable and cheap water oxidation catalysts is of great significance in energy conversion and storage. In this context, herein we have synthesized two different types of metal–organic frameworks (MOFs, denoted as BMM-11 and BMM-12) constructed from the same metal salts (cobalt nitrate) and organic linkers (H4BPTC) at the similar solvothermal conditions. Interestingly, we learned that both crystalline materials can be conveniently converted into each other by a single-crystal-to-single-crystal transformation method at their corresponding synthetic conditions. Meanwhile, we applied them directly as electrocatalysts into OER application where the pure BMM-11 and BMM-12 can achieve a stable current density of 10 mA cm–2 with an overpotential of 0.362 and 0.393 V, respectively, during which MOF degradation unexpectedly occurs. After electrolysis, the following microscopic, spectroscopic, as well as electrochemical measurements confirm that these initial MOF precursors are rapidly transformed into the mixed phases of CoOxHy species consisting of CoOOH and Co(OH)2, which are essentially active components for OER performance. Finally, we have also considered other strategies to improve MOF-derived composites in oxygen evolution activity, including bimetallic doping and physical grinding strategy. The approach described here can further be extended to other cobalt-based MOFs-derived electrocatalysts for water splitting.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2020
·
IF 5.774
Yifei Wang,Junjie Gu,Ayang Zhou,Aiqun Kong,Muntadher M. Alwan Almijbilee,Xiaokuo Zheng,Jinli Zhang,Wei Li
A novel poly[acrylate-co-amide] network composite nanofiltration membrane was synthesized via the photopolymerization on the top of amine-terminated polyetherimide using the photoinitiator BP and the monomers of TPGDA and PETA, of which the void size in the toplayer network can be modulated via a solvent immersion. The synthesized UV-15T2P-11 network membrane showed the permeance of 7.1 L m −2 h −1 MPa −1 and SBB rejection of 95% in THF. Then, molecular simulations suggested that DMF immersion can make the void size in the membrane toplayer increased from the pristine 1.0 nm to 1.7 nm. DMF-activated membrane p-UV-15T2P-11 shows excellent performance and long-term stability, with the permeance of 13.2 L m −2 h −1 MPa −1 and the SBB rejection of 91% in THF. These results illustrate that the photopolymerized network polymers combined with solvent activation are promising materials to manufacture organic solvent nanofiltration membranes.
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高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2020
·
IF 3.573
Zhirong Yang,Jing Zhang,Jiejie Huang,Gang Qian,Xuezhi Duan,Xinggui Zhou
To promote biomass-derived tar and coke upgrading, biomass pyrolysis intensification was utilized by the co-pyrolysis of biomass and caking coal with suitable particle size. The intensification led to a 15% increase in light tar fraction in tar, indicating a transformation from heavy tar to light components (phenols, aliphatic hydrocarbons). Moreover, the resulting coke achieved high strength (M25 > 80%) that can meet the requirement for moving bed gasification. To further facilitate tar upgrading and alleviate secondary reactions of volatiles that result in more secondary-coke and less gas, calcium-based Ca@Cu catalysts were synthesized and then loaded along the predicted coke cracks to improve tar quality without compromising coke granularity and strength. The results indicated that the catalytic upgrading mitigated the formation of pyrolytic water and secondary-coke, and dramatically improved tar quality as the light tar fraction in tar increased by 15–30%. Specifically, the upgraded light tar contains more phenols, naphthalenes, and anthracenes but less acids, ketones, and furfurals. It was postulated that selective cleavage of oxygen-containing functional groups (mainly ether bonds) promoted tar reconstruction to release more light aromatics during the catalysis. The coke strength continued to increase by 3–6%, possibly due to mitigation of H2O formation as indicated by more oxygen-containing groups retained in the aromatics during the Ca@Cu catalysis. The current study provided a new strategy to simultaneously upgrade coke and tar during catalytic pyrolysis of biomass for efficient utilization of the biomass.
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高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2020
·
IF 7.183
Chengyu Yang,Weixing Xu,Yang Nan,Yiguang Wang
Solvent-resistant nanofiltration (NF) membranes have numerous application prospects. In this study, a novel solvent-resistant nanofiltration membrane with a double layered polyamide structure was prepared for efficient desalination. The substrate was polyimide crosslinked with m -phenylenediamine (MPD), and the surface layer was polyamide prepared by typical interfacial polymerization. The crosslinking was confirmed by Fourier transform infrared spectroscopy . Investigation of the effects of different reaction conditions on membrane performance showed that the optimal reaction conditions were found to be: 5% aqueous MPD solution with crosslinking time of 10 min and piperazine concentration of 0.1% (m/v). The rejection rate for sodium sulfate and sodium chloride were 99.13% and 97.45%, respectively. The membrane morphologies were studied by scanning electron microscopy and atomic force microscopy . The membrane showed electronegativity in the pH range of 3.0–10.0 and its contact angle was 54.28°, indicating excellent hydrophilicity. After soaking in several solvents for a week, the membrane still had a high rejection rate of more than 90% for Na 2 SO 4 , demonstrating its excellent solvent resistance .
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高影响因子
APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Fang Liu,Weiyang Jin,Ying Li,Lekai Zheng,Yongchuan Hu,Xuewen Xu,Yanming Xue,Chengchun Tang,Hui Liu,Jun Zhang
The development of efficient non-precious metal catalysts to accelerate the oxygen evolution reaction (OER) kinetics is important for the development of water-derived hydrogen fuel. Iron-cobalt oxide ((Co, Fe) 3 O 4 ) is one of the most promising transition metal-based OER electrocatalysts under alkaline conditions, but its activity is unsatisfactory due to its limited active sites and poor electronic conductivity. Herein, self-supported (Co, Fe) 3 O 4 hierarchical nanosheet arrays with massive oxygen vacancies (denoted as V O -(Co, Fe) 3 O 4 /CC) are synthesized by a simple reduction method at room temperature. Oxygen vacancies can regulate the ratio of Co 2+ /Co 3+ , which leads to the modification of its electronic properties, and it also significantly improves the charge transfer ability and accelerates the reaction. Meanwhile, the unique hierarchical nanosheet arrays structure and abundant oxygen vacancies effectively adjust the number of OER active sites, which has a key role in developing a cost-effective oxygen electrode. Accordingly, V O -(Co, Fe) 3 O 4 /CC exhibits a relatively low overpotential of 286 mV at 10 mA cm −2 and a low Tafel slope of 41 mV dec −1 .
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高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2020
·
IF 16.683
Han Zhang,Zhaoming Luo,Yalun Liu,Yuwen Jiang
In this study, Ni 3 C nanoparticles (NPs) were loaded on LaNiO 3 NPs as a co-catalyst during the photocatalytic H 2 evolution. The evolution rate of the LaNiO 3 -3 wt%Ni 3 C composite (4093.9 μmol g −1 h −1 ) is about 5 times and 2 times as that of pristine LaNiO 3 NPs (819.2 μmol g −1 h −1 ), and 1 wt% Pt loaded LaNiO 3 NPs (1927 μmol g −1 h −1 ). The effects of co-catalyze with Ni 3 C on light absorption, electron-hole spatial separation, and surface H 2 -evolution kinetics are investigated. Loading with Ni 3 C can enhance the spatial separation of electron-hole pairs, and improve the H 2 -evolution kinetics. Further investigation shows that surface decomposition of LaNiO 3 NPs can only be observed when the Ni 3 C content is over 3 wt%, caused by the reductive carbon source needed in the loading process. This work indicates that transition metal carbide can be a promising co-catalyst candidate for oxides in photocatalytic applications without concerning corrosion from the reductive carbonaceous precursors in the loading process.
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高影响因子
MATERIALS LETTERS
·
2020
·
IF 3.204
E. Loni,M.H. Siadati,A. Shokuhfar
In the current work, for the first time, hard-templating method was applied to synthesize mesoporous Na 2 CoP 2 O 7 powder for oxygen evolution reaction (OER) application. X-ray diffraction patterns (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), and Brunauer–Emmett–Teller (BET) analyses were carried out for investigating the structure, composition, and morphology of the electrocatalyst powder. The electrocatalytic performances of the mesoporous Na 2 CoP 2 O 7 (meso-Na 2 CoP 2 O 7 ) powder along with its composites with reduced graphene oxide (rGO) were studied by linear sweep voltammetry (LSV). The meso-Na 2 CoP 2 O 7 /rGO (50/50 wt%) composite required only 167 mV overpotential to produce a current density of 10 mA cm −2 .
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高影响因子
POLYMER COMPOSITES
·
2020
·Vol. 41
·期 9
·3817-3829
·
IF 2.265
Mengjie Zhang,Liu Liu,Lin Jin,Lihao Sun,Ming Li,Lei Shang,Yu Liu,Yuhui Ao
To improve interfacial adhesion between carbon fiber (CF) and epoxy resin, a low-cost and environment-friendly method was developed to treat the CF surface via the bio-inspired co-deposition of catechol (Cc) and polyethyleneimine (PEI). It is noteworthy that the deposition process reacts at room temperature with water as solvent, and does not require harsh conditions or the use of toxic reagents. After treatment, the CF/epoxy composites were endowed with excellent mechanical properties and showed increases of 51.9% and 51.7% for flexural strength and ILSS, respectively, in comparison with unsized CF laminates. The analyses of fractured surface morphologies and strengthening mechanism of the composites indicated that the uniformly coated Cc-PEI on the fiber surface can promote the diffusion and entanglement of the matrix molecular chains and form chemical bonding as well as π-π stacking, thus effectively improving the interfacial adhesion. In addition, the facile process disclosed in this study can provide a new strategy to not only for CF treating but also expected to be used in the modification of other high performance fiber reinforcement and industrial applications.
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高影响因子
Optoelectronics Letters
·
2020
·Vol. 16
·期 5
·355-359
·
IF 0
Bian Ming-jing,Zhang Hong-yan
In this work, we studied the effect of different pH values on morphology, band gap and photoluminescence (PL) properties of Eu 3+ /Tb 3+ co-doped ZnO prepared by coprecipitation method. Experimental results show that alkaline condition is more favorable for the doping of Eu 3+ and Tb 3+ ions which reduce the band gap and increases the PL intensity of UV emission (385 nm) and visible emission (400—600 nm) of ZnO. Gaussian deconvolution PL spectra show that the defects on the surface of ZnO are decreased when it is synthesized under alkaline conditions. Furthermore, both the intrinsic orange emission of Eu 3+ ions (611 nm) and the intrinsic green emission of the Tb 3+ ions (495 nm) of ZnO in this case are obtained at the same time. High intensity green and orange emission indicates that Eu 3+ /Tb 3+ co-doped ZnO is a promising PL material and has potential in emission devices.
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