Journal of Materials Chemistry A
·
2015
·Vol. 3
·期 10
·5599-5607
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IF 7.443
Wei Wang,Likun Xu,Huyuan Sun,Xiangbo Li,Shouhuan Zhao,Weining Zhang
Hexamethylene diisocyanate trimer (HDIt) microcapsules were synthesized by in situ polymerization and were characterized via field emission-scanning electron microscopy, fluorescence microscopy, and Fourier transform infrared spectroscopy. We added HDIt microcapsules into epoxy resin coatings as functional additives and then assessed the resulting self-healing performance of the epoxy resin coatings using a scratched crevice on a 5083 aluminum surface as a test scenario. The protective coating with the HDIt microcapsules had robust self-healing after the samples were immersed in a solution of 0.6 M NaCl for 48 h. Healing efficiencies of epoxy resin coatings as high as 45.3 ± 2.9%, characterized by a fracture test, were achieved for 16 wt% HDIt microcapsules. The self-healing ability was further shown by using scanning electrochemical microscopy (SECM) and alternating current scanning electrochemical microscopy (AC-SECM). We found that AC-SECM offered additional local electrochemical topographies of the self-healing surface at different AC frequencies. Comparing the two topographical tests obtained from both SECM and AC-SECM revealed that AC-SECM achieved better spatial resolution and was less influenced by the scanning step size and the cleanliness of the tip surface.
研究领域:
材料科学
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电化学
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表面科学
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高影响因子
Polymers
·
2023
·Vol. 15
·期 13
·2791
·
IF 5
Mingqiang Shao,Yiran Shi,Jiangtao Liu,Baoxia Xue,Mei Niu
Improving the residual char of polypropylene (PP) is difficult due to the preferential complete combustion. Here, we designed a combination catalyst that not only provides physical barrier effects, but also dramatically promotes catalytic charring activity. We successfully synthesized WS2monolayer sheets decorated with isolated Ni atoms that bond covalently to sulfur vacancies on the basal planes via thiourea. Subsequently, PP blends composed of 8 wt.% Ni-decorated WS2, NiO, and activated carbon (AC) were obtained (ENi-SWS2-AC-PP). Combining the physical barrier effects of WS2monolayer sheets with the excellent catalytic carbonization ability of theENi-SWS2-AC combination catalyst, the PP blends showed a remarkable improvement in flame retardancy, with the yield of residual char reaching as high as 41.6 wt.%. According to scanning electron microscopy (SEM) and transmission electron microscopy (TEM) observations, it was revealed that the microstructure of residual char contained a large number of carbon nanotubes. The production of a large amount of residual char not only reduced the release of pyrolytic products, but also formed a thermal shield preventing oxygen and heat transport. Compared to pure PP, the peak heat release rate (pHRR) and total heat release rate (THR) ofENi-SWS2-AC-PP were reduced by 46.32% and 26.03%, respectively. Furthermore, benefiting from the highly dispersed WS2, the tensile strength and Young’s modulus ofENi-SWS2-AC-PP showed similar values to pure PP, without sacrificing the toughness.Keywords:polypropylene;Ni-modified monolayer WS2;sulfur vacancy;activated carbon;NiO;carbon nanotubes;flame retardancy;mechanical properties
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PubMed
高影响因子
Reaction Chemistry & Engineering
·
2022
·Vol. 7
·期 8
·1827-1835
·
IF 5.2
Zipin Peng,Xuepeng Wang,Zheng Li,Xingkun Chen,Yunjie Ding,Jisong Zhang
Catalytic hydrodechlorination (HDC) is considered to be a safe and effective method to treat chlorinated organic pollutants and has always been a hot spot in basic catalysis research. It is difficult to obtain excellent catalytic performance due to the inferior mass transfer performances of traditional batch reactors, and the deactivation of catalysts can easily occur due to the poisoning effect of HCl. In this work, Pd catalysts supported on activated carbon (Pd/AC) were synthesized by the ion-exchange (IE) method. The characterization results of N2 physisorption, XRD, TEM and XPS revealed that the active Pd components were uniformly dispersed on the surface of AC in the form of nanoparticles. A continuous flow system based on a micro-packed bed reactor (μPBR) was developed for the hydrodechlorination, and the hydrogenation of chlorobenzene (CB) was selected as the model reaction. With the optimal reaction conditions, a conversion and selectivity of 100% were obtained. Importantly, no obvious deactivation of the catalysts was observed during a 100 h time-on-stream test. Moreover, Pd/AC catalysts exhibited remarkable substrate suitability in dechlorination systems. The reaction kinetics for hydrodechlorination of CB in methanol was investigated after the internal and external diffusion limitations were eliminated.
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Journal of Environmental Chemical Engineering
·
2021
·
IF 5.909
Shaoru Liu,Weizi Zhang,Peng Zhu,Songlin Zuo,Haian Xia
The study reports a facile synthesis of Ag-g-C 3 N 4 /AC composites with highly photocatalytic activity and good adsorption capacity by an impregnation-thermal polycondensation process. The resulting Ag-g-C 3 N 4 /AC composites were used for treatment of different pollutants in water including Rhodamine B (RhB), Cr(VI) ions and pathogens . When the precursor mass ratio of urea and AC was 2:2, the resultant Ag-g-C 3 N 4 /AC catalyst showed the best photocatalytic performances. In particular, the composite photocatalysts exhibited highly bactericidal efficiency, which could reach 99.9% after 120 min of irradiation. The higher photocatalytic performances of Ag-g-C 3 N 4 /AC composites were attributed to the surface plasmon resonance (SPR) effect of Ag nanoparticles (NPs) together with the interfacial synergistic effects. Meanwhile, AC not only exhibited excellent adsorption capacity, but also decreased aggregation of g-C 3 N 4 , which could enhance the separation efficiency of photogenerated charge carriers. It was uncovered through Electron Spin Resonance (ESR) and radical scavenger experiments that • OH radicals, • O 2 − and h + participate in the RhB degradation under the visible light. This work shows that the high-efficient and stable Ag-g-C 3 N 4 /AC composites have a great potential in the treatment of organic pollutants , toxic heavy metals and pathogenic bacteria by adsorption/photocatalysis for practical water treatment .
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高影响因子
Journal of Cleaner Production
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2020
·
IF 7.246
Shanshan Shao,Xinggang Hu,Wenbin Dong,Xiaohua Li,Huiyan Zhang,Rui Xiao,Yixi Cai
Aldol condensation of biomass-derives coupled with hydrogenation is a promising route for the production of renewable aviation fuel. In this study, a bifunctional catalyst was prepared to integrate the aldol condensation of cyclopentanone and hydroprocessing for aviation fuel in one pot. Due to its strong mild-basic sites, Mg–Al–O performed the best with the total yield of dimer and trimer of 80.4%. Nickel was screened out to be favorable for hydrogenation. Considering the unsatisfactory porous structure of Ni/Mg–Al–O, the bifunctional catalyst was prepared with activated carbon (AC) as carrier. With Ni loading of 20 wt%, the maximum yield of targeted alkanes reached 81.1% over Ni/Mg–Al–O/AC. The calcination and reduction temperature in the preparation process were both optimized at 550 °C. In the reusability test, the yield of targeted alkanes reduced to 31.6% in the 5th run. To attenuate the hydration effect, n-pentane was introduced as solvent, and the bifunctional Ni/Mg–Al–O/AC performed stably in 5 runs. By the design of bifunctional catalyst based on the theoretical basis to realize the integration of C–C coupling and hydrogenation in one pot, it will promote the development of aviation fuel from biomass in a more sustainable and green way.
研究领域:
催化化学
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能源化学
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绿色化学
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生物燃料
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应用化学
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材料化学
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工业催化
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DOI
高影响因子
Molecular Catalysis
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2025
·
IF 4.9
Juan Liang,Chunqiong Liu,Jiaxiu Guo,Kunming Huang,Jiao Shen
In this paper, we developed a one-dimensional activated carbon (AC) coated graphitic carbon nitride (g-C 3 N 4 ) hybrid nanorods (CN HU/AC) synthesized via an ultrasonic-hydrothermal method. The dual modulation of ultrasonic cavitation and hydrothermal confinement enables simultaneous morphology engineering (1D nanorod formation) and inerfacial microstructure optimization, endowing CN HU/AC with exceptional photoelectron transfer properties. Comparative studies with pristine g-C 3 N 4 and hydrothermally modified CN HU without AC addition reveal that the optimal AC loading (CN HU/AC5) achieves remarkable Cr(VI) photoreduction under visible light, exhibiting rate constants 6.6 times and 2.1 times higher than those of g-C 3 N 4 and CN HU, respectively. This enhancement originates from synergistic effects: (1) AC’s photosensitization broadens light absorption while its coating establishes intimate interfacial contact for accelerated charge transfer; (2) The 1D architecture directs axial elctron transport, coupled with surface C = O / O = C OH groups acting as electron traps; (3) Citric acid functions as both hole scavenger and Cr(VI) complexation agent to lower reduction barriers. This study establishes a paradigm for designing carbon-coupled heterostructures for the sustainable heavy metal remediation.
研究领域:
材料科学
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环境化学
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光催化
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纳米材料
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可持续修复
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DOI
高影响因子
Nanoscale
·
2024
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IF 5.8
Liping Lian,Hui Xu,Ruchen Shu,Yujie Tan,Nan Wang,Jinzhu Ma,Feng Qin,Danyan Cen,Jianyuan Hou,Renxi Zhang
A novel catalyst was fabricated using a two-step nonthermal plasma method by regulating surface hydroxyl groups on Na/activated carbon (AC) with 0.1 wt% Pt loading (Pt/Na/AC (P&P)) and achieved high formaldehyde (HCHO) oxidation performance at ambient temperature. Based on characterization results, we found that in the first step of nonthermal plasma treatment under argon–water, the proportion of terminal OH groups (ter-OH groups) evidently increased. Following the introduction of Na and Pt, the relative abundance of doubly bridged OH groups connecting C and Na (briNa–C-OH groups) and Pt2+ species also increased in the second step of nonthermal plasma reduction under argon, resulting in enhanced HCHO catalytic oxidation capability through a rapid reaction pathway ([HCOO−] + [OH]a → CO2 + H2O). Compared with the catalyst prepared via nitric acid oxidation and thermal deposition (Pt/Na/AC (H&T)), more Pt–Ox–Na species and surface OH groups were obtained on the Pt/Na/AC (P&P) catalyst, which not only reduced Pt consumption but also improved HCHO catalytic activity with around 100% conversion of HCHO to CO2 at 25 °C, while the Pt/Na/AC (H&T) catalyst only achieved 70% conversion. This work thus provides a new strategy for HCHO oxidation at room temperature and a novel perspective on the environmentally friendly synthesis of effective noble catalysts.
研究领域:
环境科学
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材料科学
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DOI
PubMed
高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
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2022
·
IF 11.357
Xiaoxiao Ding,Yatao Yang,Zequan Zeng,Zhanggen Huang
Dioxins in the sintering flue gas are usually removed through integrated elimination technologies by carbonaceous catalysts. However, the regeneration of the used catalyst is poorly investigated, leading to the risk of leakage of dioxins. Herein, the influences of cyclic regenerations on the dioxin removal performance of a catalyst (V2O5/AC) were investigated systematically with dibenzofuran (DBF) as a model pollutant. It was demonstrated that the adsorption capacity and oxidation activity of catalysts significantly declined after several regeneration cycles due to the decreasing external specific surface area and V5+, respectively. Compared with 79.12% DBF directly emitted from a regenerator during N2 regeneration, the emission of DBF was only 29.93% with the modification of the regeneration process through O2 addition and temperature adjustment. The possible regenerated products were also analyzed to disclose the transformation behaviors of DBF. The regeneration mechanisms of DBF followed the transformation pathway of dibenzofuranol, benzofuran, anhydride species, and ultimately to CO2 and H2O. Moreover, the accumulated heavy aromatics on the surface could be decomposed by introducing O2. This research provides a comprehensive understanding of dioxin transformation behavior and a theoretical basis for efficient control of dioxin removal in the whole integrated removal technologies.
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高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2021
·
IF 5.816
Yu Zhang,Jiming Wang,Guojie Zhang,Jun Liu,Lizhen Dou,Ying Xu,Guoqiang Li
An appropriate preparation method is the essential to improve the catalyst performance. In this study, Co–Ce/AC-N catalysts were fabricated on N-doped activated carbon supports by impregnation, sol-gel, precipitation and mix methods, respectively. It was used to catalyze the combined steam and dry reforming of methane (CSDRM). The effects of different preparation methods on the catalyst performance were investigated by means of N 2 adsorption-desorption, XRD , H 2 -TPR, TEM, CO 2 -TPD, FTIR and XPS. Compare with the catalysts prepared by other methods, the catalyst prepared by impregnation exhibits a large surface area, high active metal dispersion, and strong metal-support interaction. Meanwhile, it also has strong basic sites and abundant oxygen vacancies . These greatly improve the activity and stability of the catalyst. The conversions of CH 4 and CO 2 at 650 °C were achieved 71.6% and 64.4%, and H 2 /CO was retained at 1.5.
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高影响因子
FUEL
·
2018
·
IF 4.908
Fei Wang,Junming Xu,Jianchun Jiang,Peng Liu,Fanglin Li,Jun Ye,Minghao Zhou
Catalysts were prepared and utilized in the hydrotreatment of vegetable oil and FAME to produce diesel-like hydrocarbons. Mo 2 C/AC catalyst displayed the higher catalytic activity with 100.00% conversion and 21.01% cracking ratio, compared to MoO/Al 2 O 3 (85.64%, 25.79%), MoS 2 /Al 2 O 3 (83.46%, 11.88%), Mo/Al 2 O 3 (67.99%, 33.19%), NiP/Al 2 O 3 (48.72%, 3.49%), Ni/Al 2 O 3 (18.12%, 0.00%), and MoO/AC (56.05%, 18.55%). The reaction condition was also optimized, and the bio-diesel achieved 100.00% conversion, 9.67% cracking ratio and 0.73 HDO/DC ratio over Mo 2 C/AC under the optimal condition. The conversion over Mo 2 C/AC dropped from 100.00% to 87.08% and 71.06% with cycles. The results of XRD , XPS and N 2 adsorption–desorption demonstrated that the coke deposited on the surface of catalyst and the formation of MoO 2 and MoO 3 led to the deactivation. After regeneration, the catalyst recovered and achieved 99.36% conversion.
研究领域:
化学工程
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催化
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可再生能源
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生物燃料
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DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2025
·
IF 19
Liuyan Li,Shuwen Yang,Kailai Xia,Meixin Chen,Yuhang Zhuang,Wenqi Zhu,Qinzhui Huang,Yanfang Wang,Xuanhe Fan,Wenqi Zhao,Zhixing Lu,Yeye Wen,Mingmao Wu,Zhigang Zou
With the miniaturization of integrated circuits driving increased demand for high-frequency alternating current (AC)-line filtering capacitors, portable electrochemical capacitors (ECs) must reconcile two persistent challenges: i) the inherent contradiction in synergistic enhancement between areal capacitance ( C A ) and volumetric capacitance ( C V ) at the condition of high frequency response, and ii) developing scalable fabrication methods. To address these issues, an electrostatic-induced Marangoni assembly process is introduced, which enables large-area, rapid deposition of poly(3,4-ethylenedioxythiophene) (PEDOT) films with a uniform, 3D fibrous porous network. By pre-treating the PEDOT:poly(styrenesulfonate) (PSS) ink with a polar solvent and applying an electrostatic field, Marangoni flows align microdroplets into a continuously interconnected 3D architecture. This structure not only facilitates ultrafast ion transport but also provides abundant storage sites, yielding a sultaneous enhancement in C A (1.72 mF cm⁻ 2 ) and C V (13.2 F cm⁻ 3 ), as well as an exceptional phase angle of −82.9° at 120 Hz. These metrics surpass those of most reported carbon- and PEDOT-based filtering capacitors. Moreover, the method accommodates high-loading of pseudocapacitive materials, demonstrating its versatility for composite electrode engineering. Subsequent AC-line filtering tests confirm the practical applicability of these electrodes, offering a scalable route to miniaturized capacitors with synergistically optimized C A and C V .
研究领域:
材料科学
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电化学
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纳米技术
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电子器件
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高分子科学
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应用物理学
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DOI
高影响因子
Bioengineered
·
2021
·
IF 3.269
Jie Guo,Shuai Xu
Allergic rhinitis (AR) is a symptomatic allergic disease that leads to severe inflammation. Astragaloside IV (AS-IV) is a primary active component of Astragalus membranaceus and exerts immune-regulation and anti-inflammatory effects. However, the pharmacological effect of AS-IV in the nasal epithelial cells (NECs) has not been reported. The present study aimed to assess the effect of AS-IV on inflammatory cytokines and mucin 5 subtype AC (MUC5AC) overproduction in histamine (His)-stimulated NECs and its underlying mechanism. NECs were stimulated with or without His for 24 h in the absence or presence of AS-IV. The levels of inflammatory cytokines including IL-6, IL-8, MCP-1, IL-1β, granulocyte-macrophage colony-stimulating factor (GM-CSF), eotaxin, and MUC5AC were assayed. Our findings indicated that AS-IV inhibited His-evoked release and expression of inflammatory cytokines and MUC5AC in NECs. RNA-seq analyses indicated the significant changes in expression levels involved in inflammation genes upon treatment of His-induced NECs with AS-IV. Our findings indicated that AS-IV inhibited His-evoked inflammatory cytokines secretion and MUC5AC overproduction in NECs, which were partly mediated by regulation of inflammation-related genes. Therefore, our findings provided a scientific basis for the development of AS-IV as an effective agent for clinical therapeutic strategy in the treatment of AR.
研究领域:
免疫学
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药理学
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过敏与免疫学
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细胞生物学
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DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）