COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
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IF 5.518
Zheng Liu,Ruonan Jia,Yang Jian,Feng Chen,Guilong Yan,Dongxu He
The occurrence of corrosion can’t be completely eliminated. To prevent the failure of structural materials, corrosion has to be easily identified, visualized and detected at early-stage, in order to intervene at the point where it is necessary. In this view, fluorescent N-doped CDs have been synthesized to synergistically inhibit and monitor corrosion of iron. The as-prepared CDs were fabricated by simple solvothermal process using citric acid as carbon source and ammonia as dopant . It is found that the active groups on the surface of the CDs promote the formation of adsorption film of CDs on iron plates and effective fluorescence emission . As a result, the CDs could readily inhibit the corrosion of iron and exhibit an inhibition efficiency of 88 % at 180 mg/L. As the degree of corrosion increases, the CDs-adsorption film can sensitively, visually and effectively respond to released Fe 3+ due to the complexation between CDs and Fe 3+ . Due to this dual function of CDs for corrosion monitoring and inhibition, they can readily trace early-stage corrosion and prevent its development. This is a synergistic strategy to prevent critical engineering failures and to ensure the safety of structural metal materials.
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JOURNAL OF SOLID STATE ELECTROCHEMISTRY
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2022
·Vol. 26
·期 10
·2133-2142
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IF 2.747
Xu Lu,Sun Wanzhou,Zhu Aiping
To solve the volume expansion problem of Fe 3 O 4 nanoparticles (nmFe 3 O 4 ), a facile, green, and industrializable preparation of N-doped carbon–encapsulated nmFe 3 O 4 (nmFe 3 O 4 @N-doped C) is designed. This nmFe 3 O 4 @N-doped C is prepared through pyrolysis in nitrogen atmosphere of nmFe 3 O 4 encapsulated by polyaniline (PANI@nmFe 3 O 4 ) which is obtained through oxidative polymerization of aniline on the surface of nmFe 3 O 4 . In comparison with the capacity (113 mAh g −1 at 0.1C) of nmFe 3 O 4 , the nmFe 3 O 4 @N-doped C electrode exhibits a high reversible capacity of 400 mAh g −1 after 500 cycles. Even at 4C, the nmFe 3 O 4 @N-doped C electrode presents 160 mAh g −1 capacity, which is much higher than 30 mAh g −1 of the nmFe 3 O 4 electrode. The results suggest that the N-doped carbon shell layer obtained from PANI is effective to inhibit volume expansion of nmFe 3 O 4 core and maintain the electron and ion transport channels after long cycles.
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CERAMICS INTERNATIONAL
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2022
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IF 5.532
Min Wang,Yu Mei,Silu Chen,Sridhar Komarneni,Jianfeng Ma
Metal-based nitrogen-doped carbon (M-N-C) materials have attracted wide attention owing to their effectiveness in activating persulfate (PS) for remediation of organic pollutants. Herein, we report a simple method of pyrolysis and simultaneous self-reduction for preparing porous N-doped carbon nanospheres encapsulated with cobalt nanocrystals (Co/p-CN) as a composite catalyst for PS activation. Co/p-CN composite was characterized by powder X-ray diffraction (XRD), Raman spectroscopy , scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS). The composite exhibits a high surface area and rich mesoporous structure, which is conducive to exposing more active sites and facilitating mass transport of the matrix. N-doped carbon nanospheres were used to protect the cobalt nanocrystals and N doping helped to fix the Co metal through coordination for manipulating its catalytic activity. After systematic study on the preparation conditions of Co/p-CN composite, it was found that the best Co/p–CN–900 (pyrolyzed at 900 °C) could efficiently degrade tetracycline (TC) in 40 min. The quenching experiments showed that Co species in porous N-doped carbon nanospheres caused the oxidation through radicals and nonradicals (SO 4 •− , •OH, O 2 •− and 1 O 2 ) in the presence of PS. PS activation of Co/p–CN–900 composite involved the mediated electron-transfer for disintegration of refractory organic TC.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2022
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IF 6.371
Yanyan Cui,Ping Zhang,Mengke Li,Chengcheng Lin,Yaling Wang
Photocatalysis technology is considered an effective way to solve the problem of water pollution and energy shortage, and is hinged on the development of the photocatalyst . In this study, p-type semiconductor AgFeO 2 and the n-type photocatalyst Ag 3 VO 4 formed a p-n junction via a simple hydrothermal method . Compared with pure Ag 3 VO 4 , the 4 % AgFeO 2 -modified Ag 3 VO 4 photocatalyst (AgVFe-4) exhibited the best photocatalytic activity: the photodegradation rate of RhB reached 95.1 % within 60 min and possessed good photostability under UV–visible light irradiation. The physical and chemical properties of AgVFe-4 indicated that the composite structure showed a larger special surface area, much lower intensity of photoluminescence , and higher photogenerated carriers separation efficiency. The p-type AgFeO 2 and n-type Ag 3 VO 4 could form the p-n junction structure. Based on the analysis of reactive agents, the h + , •O 2 − and •OH were the main active species during organic pollutions photodegradation, and the photocatalysis process followed the Z-scheme mechanism. Meanwhile, some silver element in the photocatalyst was reduced into Ag 0 , which could act as the recombination center of the photogenerated carriers, further improving the photocatalytic performance. This work may arouse an increasing interest in designing more Z-scheme silver-based p-n junction heterojunction photocatalysts.
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ChemSusChem
·
2022
·Vol. 15
·期 19
·e202201386
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IF 9.14
Zhenzhen Zhou,Xiao Liu,Jian-Gong Ma,Peng Cheng
Graphical It's a trap ! Through a new “ligand-in-dimer-trap” strategy, the host–guest composites featuring metal–organic framework-encapsulated binuclear NHC−Co complex ( Co 2 @MOF) is prepared and used as a double-sites catalyst, which combines and surpasses the advantages of homo- and heterogeneous catalysis and exhibits prime performance in converting CO 2 into widely used formamides under ambient conditions. Environmental problem caused by carbon emission is of widespread concern. Involving CO 2 as C 1 resource into chemical synthesis is one of the most attractive ways for carbon recycling. Herein, the first example of host–guest composites featuring metal–organic framework (MOF)-encapsulated binuclear N-heterocyclic carbene (NHC) complex, Co 2 @MIL101, was developed with the molecularly dispersed [Co(IPr)Br] 2 (μ-Br) 2 ( Co 2 ) loading in the cage of MIL-101(Cr) via a “ligand-in-dimer-trap” strategy, which was comprehensively investigated through various techniques including synchrotron X-ray absorption, electron microscopy, X-ray diffraction, solid-state nuclear magnetic resonance spectroscopy, and others. The noble-metal-free double-sites catalyst Co 2 @MIL101 exhibited promising stability, activity, efficiency, reusability, and substrate adaptability for converting CO 2 into various formamides with amines and hydrosilanes and achieved the best performance for one of the most useful formamides, N -methyl- N -phenylformamide (MFA), among the recyclable catalysts at ambient conditions, providing a reliable approach to successfully unify the advantages of both homo- and heterogeneous catalysts. Density functional theory calculations were applied to illustrate the superior activity of the binuclear NHC complex center as double-sites catalyst toward the activation of CO 2 .
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高影响因子
ACS Applied Materials & Interfaces
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2022
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IF 10.383
Zhenzhong Li,Huating Jiang,Jinxiu Liu,Tiantian Ning,Nam T. S. Phan,Fang Zhang
Conformational dynamics of active sites in enzymes enable great control over the catalytic process. Herein, we constructed a metal–organic framework with conformationally dynamic active sites (Rh2-ZIF-8). The active sites in Rh2-ZIF-8 were composed of the imidazolate-bridged bimetallic center with a catalytic dirhodium moiety and structural zinc site. Even though the coordination sphere of the dirhodium species was saturated with two circularly arranged esp groups and two axial 2-MeIm ligands, it could still effectively catalyze the direct synthesis of N–H aziridines from olefins with high activity. We found that such a self-adaptive catalytic process was based on the dynamic breakage and reformation of the rhodium–zinc imidazolate bridges. Interestingly, the in situ generated dirhodium site with a unique Rh2(esp)2(2-MeIm)1 configuration was able to exhibit obviously enhanced selectivity compared to homogeneous catalyst Rh2(esp)2. Furthermore, the surrounding zinc imidazolate groups could effectively protect the dirhodium moieties from harsh environments, and this ultimately endowed it with high stability.
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Nanomaterials
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2022
·Vol. 12
·期 13
·2213
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IF 5.719
Yafei Hou,Xiaodan Pei,Yuancheng Wang,Luyuan Zhang,Xiaohui Wei,Hongyan Mao,Wuduo Zhao,Shusheng Zhang,Wenfen Zhang
The aromatic structure and the rich nitrogen content of polymers based on covalent triazine-based frameworks (CTF) and their unique hydrophilic-lipophilic-balanced adsorption properties make them promising candidates for an adsorbent that can be used for sample pretreatment. Herein, a new covalent triazine-based framework (CTF-DBF) synthesized by a Friedel–Crafts reaction was used for the determination of the content of nucleotides in commercial infant formula. It was shown that the synthetic materials had an amorphous microporous structure, a BET surface area of up to 595.59 m2/g, and 0.39 nm and 0.54 nm micropores. The versatile adsorption properties of this material were evaluated by quantum chemistry theory calculations and batch adsorption experiments using five nucleotides as probes. The quantum chemistry results demonstrated that CTF-DBF can participate in multiple interactions with nucleotides. All the analyses performed present good linearity with R2> 0.9993. The detection limits of targets ranged from 0.3 to 0.5 mg/kg, the spiked recoveries were between 85.8 and 105.3% and the relative standard deviations (RSD, n = 6) were between 1.1 and 4.5%. All these results suggest that this versatile CTF-DBF has great potential for sample pretreatment.Keywords:covalent triazine-based frameworks;solid-phase extraction;nucleotides
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ChemistrySelect
·
2022
·Vol. 7
·期 31
·e202201268
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IF 2.307
Aixiao Fu,Mengqing Sun,Shifeng Jiang,Huanfei Xu,Guoqiang Xu
Graphical Pyrroles are important nitrogen-containing compound. Here, we constructed N, P-doped activated carbon supported Ir to perform the synthesis of pyrroles from alcohols and amino alcohols. The unique performance is attributed to the interaction between Ir and N, P-doped activated carbon. Pyrroles are a significant class of nitrogen-containing heterocyclic compounds and the derivatives. Here, an efficient procedure has been proposed for the loading of Ir on N, P-doped activated carbon to exploit pyrroles are synthesized from alcohols and amino alcohols. And the optimal conversion of 1-phenylethanol is up to 65 % with 2-phenylpyrrole selectivity of 80 %. The good performance is attributed to the interaction between metal Ir and N, P-doped activated carbon, which could also be confirmed from BET and XPS characterizations. What's more, the catalyst could be generally used for a range of reactions to produce pyrroles from alcohols and amino alcohols.
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JOURNAL OF ELECTRONIC MATERIALS
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2022
·Vol. 51
·期 6
·2909-2917
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IF 2.047
Han Yi,Jiang Wenwu,Jiang Jing,Zhou Ji,Ding Yanhuai
ZIF-67 has been widely utilized for the preparation of Co-based catalysts, N-doped porous carbon, and a variety of energy storage nanomaterials. In this paper, ultrafine Co 9 S 8 nanoparticles derived from ZIF-67 have been employed to improve the electrochemical performance of N-doped carbon nanofibers (CNFs). The Co 9 S 8 nanoparticles embedded into the CNFs provide the composites with extra Li-storage capacity and high rate capability. An accessible discharge capacity around 762 mAh g −1 can be obtained at a current density of 0.1 A g −1 after 100 cycles. Besides, the composites exhibit better cycling performance and rate capability compared with the raw N-doped CNFs.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2022
·
IF 4.598
Xiao Zhang,Dong An,Zhaoshun Bi,Wei Shan,Beibei Zhu,Long Zhou,Liangmin Yu,Han Zhang,Shuwei Xia,Meng Qiu
High-resolution electrochemical sensors with excellent sensitivity and selectivity are urgently needed for simultaneous monitoring of heavy metal ions (HMIs) in the environment. In this study, a nitrogen-doped carbon-coated Ti 3 C 2 -MXene heterostructure (Ti 3 C 2 @N-C)-based electrochemical sensor was developed for simultaneously determining (Cd 2+ ) and (Pb 2+ ) in seawater and tap water via square wave anodic stripping voltammetry (SWASV). The sensor exhibits excellent performance with a low limit of detection (LOD) (Cd 2+ 2.55 nM, Pb 2+ 1.10 nM), as well as excellent selectivity in the presence of interfering ions (Zn 2+ , Fe 3+ , Fe 2+ , Co 2+ , Ni 2+ , Mn 2+ , Cu + , Cu 2+ , and K + ) and high resolution for simultaneous detection of Cd 2+ and Pb 2+ . The N-C and Ti 3 C 2 -MXene heterostructure improves the conductivity of the composites by accelerating the electron transfer. The nitrogen-doping in Ti 3 C 2 @N-C provides adsorbent sites for electrons to coordinate with HMIs. Due to the heterostructure and the coordination by nitrogen, the interface charge transfer is enhanced and the number of selective adsorption sites is increased, improving the metals determination performance. This study proposes a new strategy for improving the electrochemical characteristics of Ti 3 C 2 -MXene by using heterostructure and nitrogen-doping effect, and develops a highly sensitive sensor for selective and simultaneous determination of HMIs.
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Bioactive Materials
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2022
·
IF 16.874
Limei Li,Qing Li,Li Gui,Yi Deng,Lu Wang,Jianlin Jiao,Yingrui Hu,Xiaoqian Lan,Jianhong Hou,Yao Li,Di Lu
Wound healing is a highly orchestrated process involving a variety of cells, including immune cells. Developing immunomodulatory biomaterials for regenerative engineering applications, such as bone regeneration, is an appealing strategy. Herein, inspired by the immunomodulatory effects of gastrodin (a bioactive component in traditional Chinese herbal medicine), a series of new immunomodulatory gastrodin-comprising biodegradable polyurethane (gastrodin-PU) and nano-hydroxyapatite (n-HA) (gastrodin-PU/n-HA) composites were developed. RAW 264.7 macrophages, rat bone marrow mesenchymal stem cells (rBMSCs), and human umbilical vein endothelial cells (HUVECs) were cultured with gastrodin-PU/n-HA containing different concentrations of gastrodin (0.5%, 1%, and 2%) to decipher their immunomodulatory effects on osteogenesis and angiogenesis in vitro . Results demonstrated that, compared with PU/n-HA, gastrodin-PU/n-HA induced macrophage polarization toward the M2 phenotype, as evidenced by the higher expression level of pro-regenerative cytokines (CD206, Arg-1) and the lower expression of pro-inflammatory cytokines (iNOS). The expression levels of osteogenesis-related factors (BMP-2 and ALP) in the rBMSCs and angiogenesis-related factors (VEGF and BFGF) in the HUVECs were significantly up-regulated in gastrodin-PU/n-HA/macrophage-conditioned medium. The immunomodulatory effects of gastrodin-PU/n-HA to reprogram macrophages from a pro-inflammatory (M1) phenotype to an anti-inflammatory and pro-healing (M2) phenotype were validated in a rat subcutaneous implantation model. And the 2% gastrodin-PU/n-HA significantly decreased fibrous capsule formation and enhanced angiogenesis. Additionally, 2% gastrodin-PU/n-HA scaffolds implanted in the rat femoral condyle defect model showed accelerated osteogenesis and angiogenesis. Thus, the novel gastrodin-PU/n-HA scaffold may represent a new and promising immunomodulatory biomaterial for bone repair and regeneration.
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JOURNAL OF MOLECULAR LIQUIDS
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2022
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IF 6.633
Xinyu Ma,Yingjuan Zhang,Shuwei Cai,Xianru He
Copolymers of N-vinylpyrrolidone (NVP) and methyl acrylate (MA) were prepared via reversible addition-fragmentation chain transfer (RAFT) polymerization, which exhibited typical lower critical solution temperature (LCST) behavior in aqueous solution. The molecular structure and composition of copolymer P(NVP-co-MA) were characterized by FTIR and NMR. The response behavior was investigated by UV transmittance tests. The LCST of the copolymer P(NVP-co-MA) can vary from 17 °C to 90 °C by adjusting the ratio of the two monomers, showing a wide tunable range. The dynamic light scattering (DLS) results showed that beyond LCST, the hydrodynamic size increased with increasing temperature, polymer molecular chains aggregated in solution, and solubility deteriorated, confirming its LCST responsiveness. In addition, the copolymer P(NVP-co-MA) is salt responsive as well as pH-responsive. The multi-responsive and biocompatible copolymer has a large potential application in the fields of materials and biomedicine.
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