CHEMICAL ENGINEERING JOURNAL
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2023
·
IF 15.1
Chengxu Jin,Dongxu Wang,Aiping Wu,Xinhui Zhang,Chungui Tian
The Co-based materials are the promising catalysts for the catalytic hydrogenation reactions. The optimization of the electronic structure and micro-morphology to achieve like-noble-metal catalysis is a current research hotspot. Here, the Co-MoN-MgO heterojunctions embedded on 2D carbon nanosheets (Co-MoN-MgO/C) were designed in a melt-salt system for efficient catalytic hydrogenation of the nitro-compounds. The tests show the intimate contact of Co with MoN, realizing effective synergy for promoting the electrons transfer from Co to MoN. The transfer optimizes the electronic structure of Co components, being favorable for the adsorption/desorption of intermediates and catalytic hydrogenation reaction. The 2D porous structure gives enhanced mass-transfer ability and large accessible surface for better contact with the reactants. Above features endow Co-MoN-MgO/C with good catalytic activity for p-nitrophenol (4-NP) hydrogenation, with a reaction rate constant k of 0.41 min −1 (10 °C), which is 2.73 times greater than Co-MgO/C catalyst (0.15 min −1 ) and even better than some reported noble-metal catalysts. Furthermore, the catalyst shows good cycling stability with no obvious deactivation after 10 cycles and obvious catalytic activity for a series of nitro-compounds. This work has important implications for the design of efficient non-noble-metal synergistic catalyst for the effective catalytic hydrogenation.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2023
·
IF 4.4
Kanjun Fang,Yusheng Wu,Juan Yang,Na Wang,Keting Mo,Chujie Zeng,Biyang Deng
An overdose of tazettine (TZ) has toxic side effects, which makes it extremely important to rapidly and subtly determine the TZ. In this study, double-emitting, nitrogen–phosphorus co-doped carbon quantum dots (N,P-CQDs) were prepared using cis -butenedioic acid, phosphoric acid, and p-phenylenediamine. An effective inner filter effect (IFE) can occur between TZ and N,P-CQDs, resulting in their fluorescence quench. Therefore, a ratio fluorescent probe was constructed for detecting the TZ was constructed. After optimizing the experimental conditions, the quenching efficiency showed a strong linear connection with the TZ concentration in the range of 0.01–30 µmol/L, with the detection limit of 0.002 µmol/L. This method could be satisfactorily applied to detect TZ in mouse plasma samples.
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CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Ruo-Ding Mao,Xing Zhang,Yi-Lei Li,Mu Lan,Wen-Ning Ren,Sheng-Jiang Huang,Xin Chang,Bing-Jie Wang,Yan Jiao,Le-Zhong Li,Xiao-Hui Wu
A solid-phase synthesis method was utilized to create a range of ferrite samples, specifically Sr 1- x Dy x Fe 12- x Ni x O 19 , where x values varied (0, 0.01, 0.02, 0.03, and 0.05). Through X-ray diffraction (XRD) analysis, it was found that up to x ≤ 0.03, the XRD pattern showed no discernible impurity phases. However, at x = 0.05, an observable impurity peak attributed to α-Fe 2 O 3 emerged. Room temperature hysteresis loop measurements revealed consistent hard magnetic behavior across all samples. Notably, changes in coercive force directly correlated with magnetocrystalline anisotropy. As substitution increased, the initial saturation magnetization ( M S ) of 59.68 emu/g (at x = 0.00) moderately reduced to 57.79 emu/g (at x = 0.05), representing a modest decline of 3.17 %. A clear trend was observed: decreasing grain size led to diminishing dielectric constants. Moreover, a strong link between the Nyquist diagram's semicircle diameter and sample resistivity was evident, showing distinctive metal-semiconductor behavior. These findings shed light on the structural and magnetic characteristics of Dy and Ni co-substituted SrFe 12 O 19 ferrites, suggesting potential for enhanced performance in advanced magnetic and electronic devices. This study significantly contributes to the field of ferrite materials, deepening our insights and paving the way for innovative applications in diverse technological domains.
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CARBOHYDRATE POLYMERS
·
2023
·
IF 11.2
Yanjun Chen,Jie Dai,Xin Shen,Junqiang Shan,Yulian Cao,Tianpeng Chen,Hanjie Ying,Chenjie Zhu,Ming Li
PBAT composites with biomass fillers have gained considerable attention as alternatives to non-biodegradable plastics. This work employed xylan derivatives as fillers for PBAT composites. Xylan was modified by introducing cinnamoyl side groups which limit the hydrogen bonding and construct π-π stacking interactions with PBAT chains. The resultant xylan cinnamates (XCi) show degree of substitution (DS) of 0.55–1.89, glass-transition temperatures ( T g ) of 146.5–175.0 °C and increased hydrophobicity , which can be simply controlled by varying the molar ratio of reactants. NMR results demonstrate that the C3-OH of xylopyranosyl unit is more accessible to cinnamoylation. XCi fillers (30–50 wt%) were incorporated into PBAT through melt compounding. The filler with a DS of 0.97 exhibited the optimal reinforcing effect, showing superior tensile strength (19.4 MPa) and elongation at break (330.9 %) at a high filling content (40 wt%), which is even beyond the neat PBAT. SEM and molecular dynamics simulation suggest improved compatibility and strengthened molecular interaction between XCi and PBAT, which explains the suppressed melting/crystallization behavior, the substantial increase in T g (−34.5 → −1.8 °C) and the superior mechanical properties of the composites. This research provides valuable insights into the preparation of high-performance composites by designing the molecular architecture of xylan and optimizing the associated interactions.
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ADVANCED ENGINEERING MATERIALS
·
2023
·Vol. 25
·期 24
·2301059
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IF 3.6
Nan Jia,Lei Wang,Qiang Weng,Yuan Jia,Pei Chen
The pursuit of efficient and cost-effective electrocatalysts for hydrogen production via water splitting remains a significant challenge. Herein, a unique layered amorphous metal–organic frameworks, designated as Co-HAB, is introduced. When utilized in oxygen evolution reaction (OER) and hydrogen evolution reaction, this Co-HAB-based electrocatalyst demonstrates superior activity and stability. Employing a mixture of Co-HAB and carbon black (Co-HAB-C) as both cathode and anode electrocatalysts in a 1 m potassium hydroxide electrolyte, the cell exhibits a voltage of merely 1.552 V and attains a current density of 10 mA cm −2 , which is suitable for hydrogen generation. Furthermore, density functional theory computations indicate that the modest OH* adsorption capability at the catalytic site plays a pivotal role in enhancing the OER catalytic efficiency, as confirmed by alcohol molecular probe tests.
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Nanoscale Advances
·
2023
·
IF 4.7
Chunying Cui,Shuang Zhang,Dandan Li,Danni Liu,Yaoqi Wang,Qi Sun,Ran Sun,Jie Zhang,Xiaoxuan Hong,Ran Huo
Atherosclerosis is a chronic inflammatory disease, characterized by a lipid accumulated plaque. Anti-oxidative and anti-inflammation as well as lipid metabolism promoting therapeutic strategies have been applied for atherosclerosis treatment. However, the therapeutic effect by a single therapeutic method is limited. Combination of the two strategies could for one thing prevent lipid accumulation cause by inflammation and oxidative stress, for another thing promote lipid efflux from atherosclerotic plaque, to normalize arteries maximumly. Hence, a multifunctional liposome co-encapsulating an antioxidant and anti-inflammatory drug epigallocatechin-3-gallate(EGCG) as well as a lipid-efflux promoting gene miR-223 was established. The system (lip@EGCG/miR-223) could encapsulate miR-223 in core areas of the liposomes to provide an effective protective effect for gene drugs. Moreover, lip@EGCG/miR-223 was smaller in size (91.28±2.28 nm characterized by DLS), making it easier to target to AS lesions which had a smaller vascular endothelial spaces. After internalized into cellular efficiently, lip@EGCG/miR-223 exhibited excellent antioxidant and anti-inflammatory effects in vitro by eliminating overproduced ROS and decreasing the level of inflammatory cytokines (TNF-α, IL-1β and MCP-1), which is due to the effect of EGCG. Besides, the lipid-efflux promoting protein ABCA1 was up-regulated when treated with lip@EGCG/miR-223. By the two therapies mentioned, lip@EGCG/miR-223 could effectively inhibit the formation of foam cells, which is a main component of atherosclerotic plaques. In AS model mice, after intravenous (i.v.) administration, lip@EGCG/miR-223 was effectively accumulated in atherosclerotic plaques, and the distribution of drugs in heart and aorta to that in kidney was significantly increased when compared with free drugs (the ratio was 6.27% for free miR-223 treated group, and was increased to 66.10% for lip@EGCG/miR-223 treated group.). By decreasing inflammation level and lipid accumulation, the arterial vessels in AS were normalized with less macrophages and micro-angiogenesis when treated with lip@EGCG/miR-223. Overall, this study demonstrates lip@EGCG/miR-223 can be developed as a potential system for atherosclerosis treatment by a combined treatment of antioxidant, anti-inflammatory and lipid-efflux promoting effects, which provides a novel strategy for safe and efficient management of atherosclerosis.
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MOLECULES
·
2023
·Vol. 28
·期 19
·6879
·
IF 4.6
Tiantian Zhang,Jiacheng Xu,Yan Sun,Shiyu Fang,Zuliang Wu,Erhao Gao,Jiali Zhu,Wei Wang,Shuiliang Yao,Jing Li
Pt-based catalysts exhibit unique catalytic properties in many chemical reactions. In particular, metal–support interactions (MSI) greatly improve catalytic activity. However, the current MSI mechanism between platinum (Pt) and the support is not clear enough. In this paper, the interaction of 1 wt% Pt nanoparticles (NPs) onβ-MnO2in carbon monoxide (CO) oxidation was studied. The Pt onβ-MnO2inhibited CO oxidation below 210 °C but promoted it above 210 °C. A Pt/β-MnO2catalyst contains more Pt4+and less Pt2+. The results of operando DRIFTS-MS show that surface-terminal-type oxygen (M=O) plays an important role in CO oxidation. When the temperature was below 210 °C, Mn=O consumption on Pt/β-MnO2was less thanβ-MnO2due to Pt4+inhibition on CO oxidation. When the temperature was above 210 °C, Pt4+was reduced to Pt2+, and Mn=O consumption due to CO oxidation was greater thanβ-MnO2. The interaction of Pt andβ-MnO2is proposed.Keywords:metal–support interaction;CO oxidation;terminal-type oxygen;bridge-type oxygen;Pt;MnO2
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GREEN CHEMISTRY
·
2023
·Vol. 25
·期 23
·9795-9804
·
IF 9.8
Jie Ren,Zhewen Zhang,Zikang Chen,Li Wan,Kaixiang Shi,Xiaoyuan Zeng,Junhao Li,Quanbing Liu
In the field of new-energy systems, the use of spent lithium-ion batteries is being rationalized as a prospective industry. However, with the progress of technology, the exploration of strategies that are efficient, green, and energy-saving has become the major issue for recycling batteries. Recently, the mechanochemical activation (MCA) process has been proposed as a method for reducing leaching time and temperature, further tackling the excessive usage of corrosive chemical agents in hydrometallurgical techniques. Herein, we present a co-grinding agent of spent LiCoO2 (S-LCO) and Na2SO3 (reduction properties) to facilitate the physical and chemical transformations of the S-LCO, thereby enhancing the leaching process. MCA can refine particle size, enhance its hydrophilicity, induce lattice distortion and refine lattice structure, and thereby the surface energy and surface negative charge are increased, further improving the reaction activity of S-LCO. Meanwhile, Na2SO3 promotes the isomorphic substitution between Na+ and Li+ and reduces Co3+ to Co2+. Because of this superiority, this novel MCA shortens leaching time and reduces leaching temperature, as well as improves leaching efficiency and reduces the use of acidic solvents. Practically, the cell with regenerated LiCoO2 exhibits excellent cycling performance and rate capability (a high capacity retention of 84.54% after 120 cycles at 0.2 C), which sheds some light on the interface process engineering of a co-grinding agent for recycling spent lithium-ion batteries.
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Advanced Composites and Hybrid Materials
·
2023
·Vol. 6
·期 6
·1-14
·
IF 20.1
Liang Taixin,Song Ruidong,Chen Chong,Alomar Taghrid S.,Xiao Fei,AlMasoud Najla,El-Bahy Zeinhom M.,Yang Yuanyuan,Algadi Hassan,Sun Lufeng
In this work, graphene oxide–supported Cu/Co nano-catalysts with low scale and large surface area were prepared by solvothermal and heat treatment, and the composite of the catalyst and ammonium perchlorate was obtained by spray method. Scanning electron microscope (SEM), transmission electron microscope (TEM), X-ray diffraction (XRD), x-ray photoelectron spectroscopy (XPS), and Brunauer-Emmett-Teller (BET) were used to analyze the surface morphology, phase composition, and electronic structure of the catalyst and composites. The Kissinger equation and differential scanning calorimetry (DSC) test were used to determine the thermodynamic data. The results demonstrate that when the heating rate was 5 K/min and the catalyst GO/Cu-Co-MOF-650 was mixed mechanically, the high-temperature decomposition temperature of AP was decreased by 100 °C, and the activation energy was decreased by 38.99 kJ/mol. By using a composite spray instead of mechanical stirring, AP@GO/Cu-Co-MOF-650 completely eliminated the low-temperature decomposition temperature of ammonium perchlorate, increased the high-temperature decomposition temperature by 117.9 °C, decreased the activation energy by 54.24 kJ/mol, and increased the heat release of ammonium perchlorate by more than four times. These results suggest that the composite of the catalyst and the ammonium perchlorate increased the specific surface area of these two materials in contact with one another, further enhancing the catalytic efficiency.
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Nature Communications
·
2023
·Vol. 14
·期 1
·1-10
·
IF 16.6
Ding Jie,Wei Zhiming,Li Fuhua,Zhang Jincheng,Zhang Qiao,Zhou Jing,Wang Weijue,Liu Yuhang,Zhang Zhen,Su Xiaozhi,Yang Runze,Liu Wei,Su Chenliang,Yang Hong Bin,Huang Yanqiang,Zhai Yueming,Liu Bin
In this work, via engineering the conformation of cobalt active center in cobalt phthalocyanine molecular catalyst, the catalytic efficiency of electrochemical carbon monoxide reduction to methanol can be dramatically tuned. Based on a collection of experimental investigations and density functional theory calculations, it reveals that the electron rearrangement of the Co 3d orbitals of cobalt phthalocyanine from the low-spin state (S = 1/2) to the high-spin state (S = 3/2), induced by molecular conformation change, is responsible for the greatly enhanced CO reduction reaction performance. Operando attenuated total reflectance surface-enhanced infrared absorption spectroscopy measurements disclose accelerated hydrogenation of CORR intermediates, and kinetic isotope effect validates expedited proton-feeding rate over cobalt phthalocyanine with high-spin state. Further natural population analysis and density functional theory calculations demonstrate that the high spin Co 2+ can enhance the electron backdonation via the d xz / d yz −2π* bond and weaken the C-O bonding in *CO, promoting hydrogenation of CORR intermediates.
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Small
·
2023
·
IF 13.3
Yu Qiu,Zhihao Sun,Zihao Guo,Benli Du,Han Ding,Peng Wang,Shaoyao Tian,Lei Qian
Vanadium-based cathode materials have attracted great attention in aqueous zinc-ion batteries (AZIBs). However, the inferior ion transport and cyclic stability due to the strong Coulomb interaction between Zn 2+ and the lattice limit their further application. In this work, CO 2 molecules are in situ embedded in the interlayer structure of NH 4 V 4 O 10 by decomposing excess H 2 C 2 O 4 ·2H 2 O in the main framework, obtaining an ion-molecule co-confining NH 4 V 4 O 10 for AZIB cathode material. The introduced CO 2 molecules expanded the interlayer spacing of NH 4 V 4 O 10 , broadened the diffusion channel of Zn 2+ , and stabilized the structure of NH 4 V 4 O 10 as the interlayer pillars together with NH 4 + ${\mathrm{NH}}_4^ + $ , which effectively improved the Zn 2+ diffusion kinetics and cycle stability of the electrode. In addition, the binding between NH 4 + ${\mathrm{NH}}_4^ + $ and the host framework is stabilized via hydrogen bonds with CO 2 molecules. NVO-CO 2 -0.8 exhibited excellent specific capacity (451.1 mAh g −1 at 2 A g −1 ), cycle stability (214.0 mAh g −1 at 10 A g −1 after 1000 cycles) and rate performance. This work provides new ideas and approaches for optimizing vanadium-based materials with high-performance AZIBs.
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ANALYTICAL SCIENCES
·
2021
·Vol. 37
·期 2
·293-299
·
IF 2.081
Liu ZHANG,Yue HOU,Xiaoyan GUO,Wei LIU,Congcong LV,Xing PENG,Zixuan ZHANG
In this work, a new chemiluminescence (CL) system of Co-Fe prussian blue analogs nanocubes (Co-Fe PBA NCs) that can catalyze luminol to produce strong CL in the absence of H2O2 was established. Co-Fe PBA NCs have the property of oxidase-like activity, and it can catalyze the generation of active oxygen radicals in a dissolved oxygen system. Since caffeic acid (CA) can remove reactive oxygen species in the system, a sensitive detection method for CA on a paper-based chip was developed. Under the optimal conditions, this method showed a good linear response to CA in the range of 10 – 800 ng mL−1 with a limit of 3 ng mL−1. The proposed method had been used for the determination of CA in tea samples. The results may open a new avenue for the catalytic property on luminol CL system without extra oxidants.
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