Advanced Sustainable Systems
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2022
·Vol. 6
·期 3
·2100321
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IF 6.737
Pei-dong Wu,Hu Li,Zhen Fang
Bimetallic synergy and carbon–nitrogen doping can contribute to enhanced catalytic activity due to the strong electronic state and unique geometrical structure. In this work, a series of biomass-derived Co-M bimetallic C N doped catalysts (Co-M@Chitosan-X; M = Zr, Ni, Fe, Cu, In; X denotes the molar percentage of M) are prepared via simple oil bath reflow and annealing. The Co-Zr@Chitosan-X catalysts are determined to contain alloys (Co-Zr), metal-carbon bonds (Co-C, Zr-C), metal-nitrogen bonds (Co-N, Zr-N), and metal oxides (Co 3 O 4 , ZrO 2 ) through a series of characterizations, in which graphite-coated alloys and metal oxides are found to be the catalytically active species. The doping of the second metal results in a significant enhancement for the number of active sites in the catalyst, and the d-band center is shifted toward a deviation from the Fermi energy level. Among the tested catalysts, Co-Zr@Chitosan-20 exhibits superior catalytic activity for the reductive amination of biobased levulinic acid to 5-methyl-2-pyrrolidone in 99.3% selectivity and 92.8% yield. This non-noble metal bimetallic synergistic catalytic protocol opens an avenue for efficiently producing biomass-derived nitrogenous chemicals.
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Inorganic Chemistry Frontiers
·
2022
·Vol. 9
·期 5
·950-958
·
IF 7.779
Shifei Kang,Zhihao Zhang,Maofen He,Zirou Fang,Di Sun,Lulu Zheng,Xijiang Chang,Lifeng Cui
Co-modification of graphitic carbon nitride (g-C3N4) photocatalysts can maximally optimize their intrinsic photoelectric structures, but usually involves complex multistep reactions, and thus is challenging because structural collapse and active site decay usually happen due to the complex process, over-treatment or conflict of different modification strategies. In this work, potassium iodate (KIO3), an edible salt additive, was used as a critical waste-free modifier in the thermal polymerization of g-C3N4, leading to a fast and coordinated co-modification of g-C3N4 photocatalysts. The final g-CN-KIO3 photocatalyst demonstrated a superior and balanced optical absorption ability and semiconductor band structure. In visible-light-driven photocatalytic model tests, g-CN-KIO3 showed a 3.25 times higher Cr(VI) photoreduction rate and five orders of magnitude lower residual bacteria in a photocatalytic sterilization within 120 min compared with raw g-C3N4. The photocatalytic performance of g-CN-KIO3 also outperformed all of the controls without maximized K–I–O co-modification (CN-K, CN-I, CN-O, and CN-KI). Photocurrent and electrochemical impedance experiments suggest that the co-modified photocatalysts have a faster charge separation ability, which is attributed to the multiple K–I–O co-modifications inducing an optimized surface electronic structure and slower carrier recombination. This work provides a new way to simplify and coordinate complex multi-factor regulation of materials.
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JOURNAL OF CATALYSIS
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2022
·
IF 8.047
Shaomian Liu,Yongjun Ji,Wenqing Xu,Jianling Zhang,Ruihuan Jiang,Liang Li,Lihua Jia,Ziyi Zhong,Guangwen Xu,Tingyu Zhu,Fabing Su
Developing efficient catalysts for low reaction-temperature catalytic reduction of NO by CO (CO–DeNO x ) is desirable but very challenging. Here, we report that hierarchically interconnected porous (HIP) Mn x Co 3- x O 4 spinels, synthesized by a facile citric acid-assisted sol–gel method, can act as highly efficient catalysts for CO–DeNO x . The obtained Mn 0.3 Co 2.7 O 4 displayed a much-enhanced catalytic performance with 87% NO removal at 100 °C and a wide active-temperature window (100–400 °C). Its superior activity stems from the following reasons: (i) the high-valence of Mn 3+ , Mn 4+ , and Co 3+ species in the Co–O–Mn structure enables the high catalytic activity and the effective redox-cycling of the Co 3+ and Co 2+ adsorption sites; (ii) the HIP structure can significantly enhance gas diffusion. This work offers an avenue to design metal oxide catalysts for CO–DeNO x by effectively controlling the doping metal concentration and oxidation states of the active components.
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COLLOIDS AND SURFACES B-BIOINTERFACES
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2022
·
IF 5.999
Rui Li,Cong Feng,Runqian Yang,Xiangfeng Li,Liping Ruan
In this study, a filter-like blocking system based on MSN with small gatekeeper 5- mercapto-2 nitrobenzoic acid (MNBA) has developed. The MNBA grafted nanoparticle MSN-SS-MNBA shows excellent blocking performance with negligible leakage when loaded with doxorubicin (DOX), and the release profiles illustrate stimuli-responsive property when triggered by GSH. Viability experiments indicate that MSN-SS-MNBA has obvious inhibition for both Hela cells and HCT116 cells, while showing good biocompatibility for L929 cells, which suggests that the modified MNBA has a synergistic effect on cancer cells-killing. Since the small grafted molecule MNBA cannot block the channels of MSN via self-assembly, a filter-like blocking model that the loaded drug bridged with modified MNBA to fulfill the blocking process is proposed. The novel blocking strategy provides a new possible way for pore blocking, and the small nanovalve can be used as synergistic molecule for cancer therapy.
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PubMed
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ACS Applied Polymer Materials
·
2022
·
IF 4.855
Zheng Zhang,Ting Li,Xuhui Zhang,Jing Huang,Bihua Xia,Jie Jiang,Mingqing Chen,Weifu Dong,Yang Wang
The increased demand for environmental protection and sustainable development has promoted the progress of renewable and biodegradable materials, especially in the field of packaging and agriculture. Such a status makes poly(butylene adipate-co-terephthalate) (PBAT) a kind of popular polyester material with an expanded utilization rate for its good mechanical properties and processability. However, a poor barrier property and light aging resistance are always the core issues during application. In order to overcome these shortcomings, Ti–dopamine (TiDA) nanoparticles were synthesized by hybridizing dopamine and a titanium precursor, resulting in a mixed phase of rutile and brookite, which was highly beneficial to light resistance. When TiDA was blended with PBAT at a low concentration (0.5–2.0 wt %), the PBAT composite films showed a great comprehensive performance. While maintaining good mechanical properties (tensile strength over 30 MPa and strain over 800%), the water vapor permeability was reduced by nearly 40%. The UV light of all wave bands could be blocked mostly by PBAT/TD composite films, which also had enhanced aging resistance, retaining over 20 MPa tensile strength and almost 100% strain after aging with UV radiation for 100 h. In summary, the PBAT/TD film material was promising for potential production in the field of agriculture and packaging.
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Food & Function
·
2022
·Vol. 13
·期 6
·3419-3430
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IF 6.317
Qun Wang,Ling Wang,Abdullah,Wenni Tian,Mingyue Song,Yong Cao,Jie Xiao
The concept of “synergy” and its applications has rapidly increased in the food industry as a practical strategy to preserve and improve health-promoting effects of the functional ingredients. In this study, hydrophilic epigallocatechin-3-gallate (EGCG) and lipophilic lycopene (LYC) were loaded separately (EGCG loaded PDE (PE), and LYC loaded PDE (PL), and also co-delivered (PEL) within a pickering double emulsion (PDE) system to induce synergistic hypolipidemic effect. Their effects on the serum lipid profile, weight of tissue fats, liver lipid droplet accumulation, and liver steatosis in a high-fat diet rat model were investigated. Moreover, different pathways (HMG-CoR, LDL-R, PPARγ and AMPK) involved in triggering hypolipidemic effects were verified at both mRNA and protein levels. The study's findings showed that inclusion of EGCG improved while LYC negatively affected the physical stability of PDE. The contents of total cholesterol and triacylglyceroles in serum and liver as well as the weight of tissue fats were substantially reduced in all groups (PE/PL/PEL). The alteration in absorption site of EGCG and enhanced bioaccessibility of LYC when delivered by PDE strengthened the hypolipidemic properties of PE and PL, mainly through triggering the pathways of HMG-CoR, LDL-R and PPARγ. Furthermore, the synergistic hypolipidemic effect of PEL was achieved mainly through the activation of the AMPK pathway.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2022
·Vol. 33
·期 7
·4712-4720
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IF 2.779
Wu Guofa,Ma Mingtao,Li Aihua,Song Kaixin,Khesro Amir,Bafrooei Hadi Barzegar,Taheri-nassaj Ehsan,Luo Shaojin,Shi Feng,Sun Shikuan,Wang Dawei
In this article, garnet-type Y 3 Al 5 O 12 (YAG) were doped with Mg 2+ -Si 4+ ionic pairs and its effect on the structure and the microwave dielectric properties was investigated. It was revealed that in ceramics Y 3 Mg x Al 5-2 x Si x O 12 ( x = 0, 0.5, 1.0, 1.5, 2.0), increasing doping concentration decreased the sintering temperature and time for the optimal densification. X-ray diffraction studies showed that the samples are isostructural to Al 5 Y 3 O 12 garnet. All sample were formed a single phase except for x = 2.0, where a secondary peak was detected. Excellent microwave dielectric properties of ε r = 10.56, Q × f = 67,571 GHz and τ f = -35.23 ppm/°C were obtained for Y 3 Mg 0.5 Al 4 Si 0.5 O 12 ceramics sintered at 1625 °C for 5 h. The factors influencing the microwave dielectric properties of Y 3 Mg x Al 5-2 x Si x O 12 ceramics were further discussed by considering the ionic polarization, packing fraction, average grain size and chemical bond valence theory.
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Nano Energy
·
2022
·
IF 19.069
Guangzhao Zhang,Xiaolan Deng,Jiawei Li,Jun Wang,Guoli Shi,Yu Yang,Jian Chang,Kai Yu,Shang-Sen Chi,Hui Wang,Peng Wang,Zhongbo Liu,Yuan Gao,Zijian Zheng,Yonghong Deng,Chaoyang Wang
The employment of localized high concentration electrolytes (LHCEs) has been demonstrated as an effective strategy for the fabrication of next-generation high-energy-density lithium metal batteries . However, the low ionic conductivity of LHCEs and their parasitic side reactions with lithium metal anodes severely hinder the cycling stability of lithium metal batteries. Herein, a partially fluorinated ether of bis (2,2-difluoroethyl) ether (BDE) is proposed as a bifunctional co-solvent to form novel LHCEs for realizing dendrite-free and long-term lithium metal batteries. The BDE co-solvent serves as a diluent to improve the ionic conductivity up to 6.4 mS/cm by dissociating lithium salt via weak interaction and decreasing the electrolyte viscosity. In addition, the BDE co-solvent could promote the formation of uniform lithium fluoride (LiF)-rich solid electrolyte interphase (SEI) to suppress the dendrite deposition by regulating the solvation shell structure , resulting in high Coulombic efficiency of 99.6%. As a result, the assembled full cell exhibits outstanding cycling stability (97% capacity retention after 200 cycles @0.5 C) with high areal capacity (2 mAh/cm 2 ) and high rate capability (2 C) under practical conditions (50 µm Li, lean electrolyte: 3 g/Ah). We also demonstrate the real application of electrolyte with a commercial cathode in 320-mAh-level pouch cells.
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SURFACE & COATINGS TECHNOLOGY
·
2022
·
IF 4.865
X.Q. Du,Y.W. Liu,D.C. Chen,Z. Zhang,Y. Chen
In the present work, silane and graphene oxide (GO) nanocomposite was successfully constructed on copper using a facile co-electrodeposition procedure. Structure and composition characterizations revealed that the added GO nanosheets were partially electro-reduced and covalently bonded with silanol groups to form a more compact and uniform nanocomposite, which contributed to the enhanced chemical and mechanical performance of the electrodeposited silane/GO nanocomposite. Electrochemical tests indicated that the corrosion current density was decreased over two orders of magnitude. The protection efficiency was maintained above 99.8% after immersing in 1 mol/L sodium chloride aqueous solution 120 h. Meanwhile, the contact angle and sliding angle of electrodeposited silane/GO nanocomposite varied slightly after abraded 150 cycles, which presented an excellent mechanical durability. According to the above results, this work supplies a feasible and effective strategy for corrosion protection of conducting materials with long-term protectiveness and mechanical robustness in real-life applications.
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THERMOCHIMICA ACTA
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2022
·
IF 3.378
Wang Guorong,Li Yu,Mei Zhiyuan,Xin Jie,Pan Wei,Wang Qingxin
Absrtact Benzoxazine is widely used in halogen-free copper clad laminate, printed circuit board and other fields in electronic information industry. However, its high curing temperature (about 250 °C) limits its future application. The effectiveness of benzoxazine catalyzed by transition metal p -toluenesulfonate(M(OTs) n ) and linear phenolic resin(PF), separately and mixed, were studied by DSC. The curing mechanism, structural changes and curing kinetics of different catalytic systems was studied by In-situ FT-IR and nonisothermal Differential Scanning Calorimeter(DSC).The results show that M(OTs)n and PF can simultaneously exist in benzoxazine as catalyst, and the catalytic ability is the strongest. The kinetic data shows that the introduction of catalyst can change the curing reaction mechanism of benzoxazine from autocatalytic curing reaction model to n-order reaction model. It follows the n-order reaction kinetic model based on Malek and Friedman method, and the theoretical calculation curve is in perfect accordance with the experimental data.
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JOURNAL OF POWER SOURCES
·
2021
·
IF 9.127
Yue Zhao,Huilian Hao,Tianliang Song,Xu Wang,Changwang Li,Wenyao Li
By combining the large power density of supercapacitors with the high energy density of ion batteries , a novel zinc-ion hybrid supercapacitor (ZHSC) is proposed and considered a promising candidate. But there are still challenges in the selection and application of reliable cathode materials . Herein, we used a mature and safe one-step hydrothermal method to synthesize N/P co-doped graphene (NPG), which exhibited a unique three-dimensional structure and a large specific surface area, showing great advantages as cathode to assemble Zn//NPG ZHSC with zinc foil. In the 1 M ZnSO 4 solution, the ZHSC shows superior electrochemical performance, which presents an excellent specific capacitance of 210.2 F g −1 under a wide working voltage of 1.8 V, and it achieves both a maximum energy density of 94.6 Wh kg −1 and a large power density of 4500 W kg −1 . More importantly, the capacitance retention rate remains 82% and a coulomb efficiency of ∼100% is achieved after 15,000 cycles. Overall, the results of this study highlight the efficient synthesis and excellent performance of NPG cathode materials, and also promote the rapid development and great application of high-performance Zn-ion hybrid capacitors.
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CARBOHYDRATE POLYMERS
·
2023
·
IF 11.2
Zongshu Xu,Ze Cheng,Qun Tang,Kangqi Huang,Heping Li,Zhiming Zou
Nowadays, there is an increasing demand for smart packaging materials capable of effectively monitoring the food freshness. In this study, new Co-based MOF (Co-BIT) microcrystals with ammonia-sensitivity and antibacterial function were constructed and then loaded within cellulose acetate (CA) matrix to create smart active packaging materials. The influences of Co-BIT loading upon structure, physical, and functional properties of the CA films were then thoroughly explored. It was observed that microcrystalline Co-BIT was uniformly integrated inside CA matrix, which caused significant promotions in mechanical strength (from 24.12 to 39.76 MPa), water barrier (from 9.32 × 10 −6 to 2.73 × 10 −6 g/m·h·Pa) and ultraviolet light protection performances of CA film. Additionally, the created CA/Co-BIT films displayed striking antibacterial efficacy (>95.0 % for both Escherichia coli and Staphylococcus aureus ), favorable ammonia-sensitivity function as well as color stability. Finally, the CA/Co-BIT films were successfully applied for indicating the spoilage of shrimp through discernible color changes. These findings suggest that Co-BIT loaded CA composite films have great potential for use as smart active packaging.
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