Journal of Materials Chemistry A
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2020
·Vol. 8
·期 8
·4369-4375
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IF 11.301
Lulu Chen,Yelong Zhang,Lile Dong,Wenxiu Yang,Xiangjian Liu,Ling Long,Changyu Liu,Shaojun Dong,Jianbo Jia
Rational design of isolated metal atom doped carbon catalysts is essential for revealing the essence of high activity for the oxygen reduction reaction (ORR), which can promote the development of robust catalysts for clean energy conversion devices. Herein, we report a simple one-step strategy to prepare Fe and Co atomically supported on N-doped nanocarbon (FeCo-IA/NC) from metal–organic frameworks with excellent ORR activity. The isolated Fe–N4 and Co–N4 sites are characterized by atomic-resolution aberration-corrected scanning transmission electron microscopy and X-ray absorption fine structure spectroscopy. The electrochemical results and density functional theory calculations indicate that the synergetic effect between Fe–N4 and Co–N4 accounts for the enhanced ORR activity. Benefiting from the large BET surface area, microporous feature, and high content (85%) of pyridinic and graphitic N, the well-designed catalyst exhibits better ORR activity (half-wave potential of 0.88 V) and Zn–air battery performances (higher open circuit potential and power density) than commercial Pt/C. This work may lay a foundation for further exploring efficient non-precious metal-based catalysts for the ORR and developing clean energy conversion devices.
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ACS Applied Materials & Interfaces
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2020
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IF 8.758
Chen Jiao,Jianan Zhang,Tianqi Liu,Xin Peng,Huiliang Wang
Shape deformable hydrogels have drawn great attention due to their wide applications as soft actuators. Here we report a novel kind of mechanically strong, tough, and shape deformable poly(acrylamide-co-vinylimidazole) [poly(AAm-co-VI)] hydrogel prepared by photoinitiated copolymerization and the followed immersing in a Cu2+ aqueous solution. Strong Cu2+ complexation with imidazole groups dramatically enhances the mechanical properties of the hydrogels, whose tensile strength, elastic modulus, toughness, and fracture energy reach up to 7.7 ± 0.76 MPa, 15.4 ± 1.2 MPa, 23.2 ± 2.5 MJ m–3, and 22.1 ± 2.3 kJ m–2, respectively. More impressively, shape deformation (bending) can be easily achieved by coating Cu2+ solution on one side of hydrogel strips. Furthermore, precise control of the shape deformation from 1D to 2D and 2D to 3D can be achieved by adjusting Cu2+ concentration, coating time, region, and one or two side(s) of hydrogel samples. The Cu2+ complexation provides a simple way to simultaneously improve the mechanical properties of hydrogels and enable them with shape deformability. The mechanically strong, tough, and shape deformable hydrogels might be a promising candidate for soft actuators.
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Drug Delivery and Translational Research
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2020
·Vol. 11
·期 3
·1133-1143
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IF 2.664
Li Ruirui,Shan Linwei,Yao Yanan,Peng Feifei,Jiang Shanshan,Yang Dandan,Ling Guixia,Zhang Peng
The platform of the combination chemo-photodynamic therapy has received widespread attention for enhancing anticancer efficacy and inhibiting tumor growth, which supports thermosensitive and controlled drug release. Here, an injectable thermoreversible hydrogel (BPNSs/DTX-M-hydrogel) co-encapsulating black phosphorus nanosheets (BPNSs) and docetaxel (DTX) micelles was prepared to increase drug accumulation in tumor tissue and improve anticancer efficacy. BPNSs were prepared by liquid exfoliation method with a simple and rapid preparation, and DTX micelles were prepared by the thin film dispersion method. Hydrogel was prepared with F127 as hydrogel matrix for intratumoral injection. BPNSs, DTX micelles, and BPNSs/DTX-M-hydrogel were characterized by particle size, morphology, stability and degradation, phase transition feature, and photodynamic performance. And the in vivo anticancer efficacy was evaluated in 4T1 tumor-bearing Balb/c mice. The results showed that the particle size of DTX micelles and BPNSs were about 16 and 180 nm, respectively. The hydrogel with the transformation temperature at near body exhibited great photodynamic efficacy and good biodegradability. Moreover, BPNSs/DTX-M-hydrogel with the combination of chemotherapy and photodynamic therapy exhibited unique anticancer efficacy with low toxicity. In conclusion, the combination platform of chemo-photodynamic therapy based on BPNSs could be a prospective strategy in antitumor research.
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Food Packaging and Shelf Life
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2020
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IF 4.244
Jie Zhang,Chenglin Cao,Shaoming Zheng,Wei Li,Baobi Li,Xiaoling Xie
Poly (butylene adipate- co -terephthalate) (PBAT)/ magnesium oxide (MgO)/ silver (Ag) ternary composite biofilms were prepared via a common solvent casting method and used for food packaging. The effects of MgO/Ag nanoparticles (NPs) on the physical and antibacterial properties of the composite biofilms were comprehensively investigated. The physical properties of the PBAT matrix, such as the mechanical and barrier properties, are improved by the incorporation of MgO/Ag NPs. The composite films with 3 wt% NPs content exhibit the optimal properties. Specifically, the tensile strength, the elongation at break, water barrier property, and oxygen barrier property are 11.91 MPa, 415.63 %, 1.135 kg·m/m²·s·Pa, and 3.679 Barrer, respectively. Furthermore, the inhibition rates of ternary composite film against Escherichia coli and Staphylococcus aureus exceed 90 %, indicating potential for application in the food packaging industry.
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HYDROMETALLURGY
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2020
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IF 3.338
Xintao Yi,Guangsheng Huo,Wei Tang
The extraction of Fe(III), Ni(II) and Co(II) from a Ni(II)-Co(II) solution containing Fe(III) was analyzed in a chloride medium using a mixed extractant consisting of 50% ( v /v) tributyl phosphate (TBP), 20% (v/v) 2-octanol and 30% (v/v) kerosene. The extraction of 0.5 mol/L Fe(III) in 4 mol/L hydrochloric acid reached 97%, and the consumption of chloride ions was investigated. Nickel(II) ions were not detectably extracted by TBP, with an inclusion of <1.1%. Compared with Fe(III), TBP extracted only a small amount of Co(II). The iron complexes formed by TBP and 2-octanol were [H 2 FeCl 4 · 2TBP] and [H 2 FeCl 4 · 5(2-octanol)], and the possible compositions of Co-containing extracts were [H 2 CoCl 4 · 2TBP] and [H 2 CoCl 4 ] · n[2-octanol]. An industrial process consisting of two-step extraction was designed to achieve the separation of Co(II) and Fe(III), resulting in a decrease in the Fe/Co mass ratio from 0.46 to <3.5 × 10 −4 in the raffinate.
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JOM
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2020
·Vol. 72
·期 3
·1279-1285
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IF 2.054
Xia Yang,Zhao Jinlong,Dong Zhaowang,Guo Xueyi,Tian Qinghua,Liu Yong
Cobalt-chrome-molybdenum (Co-Cr-Mo) alloy possesses outstanding strength, wear, and corrosion resistance and is a good material candidate for making dental and orthopedic implants. Spherical Co-Cr-Mo powder for additive manufacturing is usually costly due to the high-temperature melting processes and low yield of the powder with desirable particle size in the conventional melt-atomization process. A novel process for making spherical Co-Cr-Mo alloy powder through a simple meltless granulation and sintering process is described herein. The results indicate that the compositional segregation problem can be overcome and high-temperature operation avoided. Segregation-free powder was obtained after sintering above 1200°C. The powder was purified during sintering in a hydrogen atmosphere. The hydrogen purification mechanism is discussed with the aid of thermodynamic modeling using HSC Chemistry software. The oxygen content in the final powder can be controlled to < 0.2 wt.% for powder with particle size < 107 µ m. The final powder retained good spherical morphology.
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JOURNAL OF HAZARDOUS MATERIALS
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2020
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IF 9.038
Jingju Cai,Minghua Zhou,Xin Xu,Xuedong Du
Anode materials are crucial to anodic oxidation for wastewater treatment. In this regard, stable boron and cobalt co-doped TiO 2 nanotube (B, Co-TNT) was prepared for the first time, and its lifetime was found increased significantly while electrocatalytic activity decreased with the increase of Co(NO 3 ) 2 in preparation from 1 to 10 mM. Characterized by scanning electron microscope (SEM), X-Ray Diffraction (XRD) and X-ray Photo-electronic Spectroscopy (XPS), B and Co content were optimized and successfully doped on TNT, which was more smooth without ripple with Co content of 0.038 mg/cm 2 in a valence of +2, and B atomic content of 2.17 at.% in form of Ti-B-O. This optimized anode enhanced electrode lifetime 122.8 times while the electrochemical activity decreased slightly when compared to the undoped TNT. The effects of current density, initial pH and initial 2,4-dichlorophenoxyacetic acid (2,4-D) concentration were investigated, and the mainly responsible radical for degradation was confirmed to be the surface OH on B, Co-TNT anode. This anode had better performance on the TOC removal, mineralization current density (MCE) and energy consumption (Ec) when compared with BDD, PbO 2 , DSA and Pt anodes, and it also presented a very stable degradation for 10 cycles oxidation of 20 mg/L 2,4-D with allowable Co leaching. Therefore, B, Co-TNT anode is a promising, stable, safety and cost-effective anode for application in electrochemical advanced oxidation processes (EAOPs).
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COLLOID AND POLYMER SCIENCE
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2020
·Vol. 298
·期 6
·629-636
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IF 1.536
Yang Xu,Li Wenbo,Sun Zhaojie,Yang Chunhui,Tang Dongyan
In this work, pH/temperature dual-sensitive polymers of P(NVCL-co-MAA) with the increased low critical solution temperature (LCST) values of about 37 °C that differed from that of ~ 32 °C of pure poly(N-vinyl caprolactam) (PNVCL) were synthesized via radical polymerization. Then the nanofibers of P(NVCL-co-MAA) and its cospinned nanofibers with nifedipine (NIF) as drug model were fabricated by electrospinning method. Structures and the interactions within the components were detected by FT-IR, NMR, and XPS methods. The dual-responsive properties and the controlling release of the drug were investigated by water contact angle tests and in vitro drug release tested by UV-vis spectrophotometer. SEM was conducted to demonstrate the morphology of the nanofibers and the obvious improved stabilized morphology of the modified system within the aqueous media. The maintained morphology within the media and the obvious elongated releasing period of over 150 min at 37 °C and with pH of 1.99 both proved the promising prospects of the fabricated nanofibers as excellent carrier in drug delivery system.
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JOURNAL OF MATERIALS SCIENCE
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2020
·Vol. 55
·期 17
·7417-7431
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IF 3.553
Meng Xingtong,Jia Shuai,Mo Lanlan,Wei Jie,Wang Feijun,Shao Ziqiang
Nowadays, it has become a trend to prepare porous carbon as electrode materials for supercapacitors by using biomass and its derivatives by virtue of its low cost, abundant source and environmental friendliness. Carboxymethyl cellulose ammonium (CMC-NH 4 ), a kind of cellulose derivative, is used as a carbon precursor and O/N source to prepare carbon material through cross-linking with aluminum ions, lyophilization, carbonization and activation. The as-prepared O/N-co-doped carbon samples (ONAC-500, ONAC-600 and ONAC-700) exhibit hierarchically porous structure with different size pores in carbon framework, ensuring electrolyte ions effective transport and diffusion. Meanwhile, the ONAC-600 reveals a high specific surface area of 2658 m 2 g −1 , abundantly porous structure with pore volume of 1.32 cm 3 g −1 and effective O/N-doping, which ensure a high capacitance of 465.0 F g −1 at 1 A g −1 in 3 M KOH three-electrode system. It also shows better rate capability and good stability after 10000 cycled under 10 A g −1 . Besides, the assembled all-solid-state supercapacitor with ONAC-600 delivers an acceptable energy density of 7.8 Wh kg −1 at a power density of 124.2 W kg −1 .
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JOURNAL OF CONTROLLED RELEASE
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2020
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IF 7.727
Tao Sun,Guangping Zhang,Zhongyuan Guo,Qinjun Chen,Yujie Zhang,Yongchao Chu,Qin Guo,Chao Li,Wenxi Zhou,Yiwen Zhang,Peixin Liu,Hongyi Chen,Haijun Yu,Liping Jiang,Chen Jiang
Chelating Cu from tumors has been verified as an effective and promising strategy for cancer therapy through antiangiogenesis. However, systematic removal Cu by injecting with Cu chelators will result unavoidable side effects, since Cu is indispensable to the body. In this work, a micelle targeting to tumors' newborn vessels based on a polypeptide was developed to co-load DOX and Probe X, which can go through an “OFF-to-ON” procedure to report the Cu + -capture events in vivo in a real-time way by giving near infrared (NIR) fluorescence and photoacoustic signal. By co-delivering antiangiogenesis and chemotherapeutic reagents, the tumor can be significantly suppressed, meanwhile with a low systematic toxicity. Hopefully, this work can offer new insights in designing sophisticated antitumor strategy.
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APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Qiang Liu,Zhuo Li,Qiuwen Liu,Chuchu Cheng,Mingxia Song,Caijin Huang
The Co@BN core–shell nanostructure of Co core and boron nitride (BN) shell was prepared through a facile one-step thermal treatment. The as-prepared Co@BN nanocomposites exhibited excellent dye-sensitized photocatalytic hydrogen evolution activity (13.78 mmol h −1 g −1 ) with visible light and the apparent quantum yield was 1.15%. The enhanced adsorption of EY on the BN shell and the Co/BN Schottky junction facilitate the tandem transfer of photo-generated carriers to the Co surface. Moreover, the core–shell interface serves as a nanoreactor boosting the reduction of H + to H 2 on the Co surface. Additionally, the magnetic recyclability makes Co@BN favorable for its practical application. This work extends the application of the “photocatalysis under shell” and has potential in dye-sensitized solar cell.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2020
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IF 5.774
Dandan Cao,Qingyao Wang,Yue Wu,Shuxu Zhu,Yao Jia,Renliang Wang
Bi/Bi 2 MoO 6 /TiO 2 NTs photocatalysts were synthesized on the basis of TiO 2 NTs by a solvothermal method using glucose as the reducing agent. The removal of organic dyes such as RhB and MB and heavy metal ions like Cr(VI) were used to simulate industrial wastewater for the photocatalytic activity assessment of Bi/Bi 2 MoO 6 /TiO 2 NTs. Na 2 S/Na 2 SO 3 solution was used as sacrificial agent to study the photocatalytic hydrogen generation performance of samples. The results showed that Bi 3+ was successfully reduced to metal Bi and deposited on the surface of Bi 2 MoO 6 . The removal efficiencies of RhB, MB and Cr(VI) reached 73.21%, 92.98% and 70.54%, respectively, which confirmed the excellent photocatalytic activity of samples. The photocatalytic hydrogen production performance of the sample was also remarkable and the hydrogen generation rate reached 173.41 μmol·h −1 ·cm −2 . The active species and photocatalytic mechanism of pollutant degradation and hydrogen generation were proposed based on the photoelectrochemical data. The excellent photocatalytic performances of Bi/Bi 2 MoO 6 /TiO 2 NTs will exhibit prospective guidance for the preparation and photocatalytic water splitting of bismuth-based photocatalysts.
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