FUEL
·
2025
·
IF 7.5
Xiaoning Zhang,Buning Chen,Jianwei Wang,Yusheng Zhou,Xueli Huang,He Huang
The high content of heteroatoms and trace metals makes it difficult to upgrade poor-quality oils (PQO). The co-pyrolysis or co-hydrogenation of coal tar (CT)/vacuum residue (VR) is a new approach for the efficient utilization of PQO. The products of CT/VR co-pyrolysis and co-hydrogenation were characterized by RV, TG-FTIR, and GC × GC-TOF. Co-pyrolysis reduces the reaction harshness by lowering the activation energy of pyrolysis. Co-pyrolysis changes the reaction paths of oxygen-containing free radicals by promoting the generation of oxygen-containing organic compounds and inhibiting coke generation by increasing the pyrolysis spillover of unsaturated hydrocarbons. Co-hydrogenation increased the gasoline and diesel yields while reducing coke production. The saturates, aromatics, resins, and asphaltenes of CT and VR experienced a significant increase in the gasoline and diesel fractions after hydrogenation. The gasoline and diesel content enhancement in the four-component hydrogenation products of CT increased with increasing polarity, whereas the opposite trend was observed for the four-component hydrogenation of VR. There was a clear synergistic effect between the aromatics of CT and VR in terms of hydrogenation saturation, while the synergistic effect of the aromatics was somewhat weaker. The saturates and resins had an inhibitory effect on each other.
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高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
·
IF 5.4
Hong Zhao,Yuqi Yang,Man Zhou,Lihui Xu,Hong Pan,Qun Yang,Zaisheng Cai
Anti-fog glass can solve the safety problems caused by glass fogging in a wide range of applications. However, its durability is still insufficient under actual application conditions such as high humidity, friction and scratches, et al. Therefore, this work copolymerised hydrophilic chain segments N-hydroxyethyl acrylamide (HEAA) containing -OH and water-resistant -NH-CO-, hydrophobic chain segments butyl acrylate (BA) and a “bridging agent” 4-benzoylphenyl acrylate (BPA) into a trimeric anti-fog coating. And, -OH was introduced to the glass surface by a simple plasma treatment. The BPA was covalently linked with hydrophilic and hydrophobic polymers HEAA/BA through a free-radical polymerisation reaction of double-bonded to form a covalent carbon chain. Meanwhile, it covalently combined with the -OH on the glass surface. BPA formed a stable link between the anti-fog coating and the glass substrate. Thus, the coating was resistant to 400 cycles of sand abrasions and can lift up to 1500 g. The -NH-CO- in HEAA and BA significantly increased the water resistance of the coating which can be immersed in water for 120 h. The -OH in HEAA not only given the coating excellent anti-fogging properties, but also enabled it to self-heal quickly within 10 s. The durable anti-fog coatings prepared in this work have great potential for practical applications.
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DOI
高影响因子
RARE METALS
·
2019
·Vol. 40
·期 1
·90-95
·
IF 1.785
Zhu Ying-Gang,Shang Chao-Qun,Wang Zhen-Yu,Zhang Jian-Qiao,Yang Ming-Yang,Cheng Hua,Lu Zhou-Guang
It is a big challenge to prepare non-rare metal and high-activity
electrocatalysts for oxygen reduction reaction (ORR). In this paper, a cobalt/carbon
nanotubes/chitosan composite gel was synthesized and then annealed under nitrogen
atmosphere to yield the cobalt and nitrogen co-modified carbon nanotubes (Co–N-CNTs)
nanocomposite electrocatalysts. In this strategy, the cobalt component considerably
enhanced the ORR activity and improved the degree of graphitic structure to increase the
electronic conductivity. The chitosan served as sustainable source for nitrogen doping.
The Co–N-CNTs exhibit excellent oxygen reduction reaction (ORR) electrocatalytic
activity due to the synergetic effect of Co species and N-doping. The Co–N-CNTs also
deliver excellent methanol tolerance and superior long-term durability to that of
commercial Pt/C, making it a promising ORR electrocatalyst.
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高影响因子
Journal of Macromolecular Science Part B-Physics
·
2021
·
IF 1.504
Meiling Yi,Zhihua Zhou,Wenjuan Liu,Tianlong Huang,Yanmin Zhao,Ping Chen,Ziwei Zhou,Dan Wang,Chao Zhang,Jianjun Fang
Among drug delivery systems, polymer microspheres have been proved to be the most promising carriers during the past several years. In this paper we describe the preparation of poly(L-lactide-co-glycolide-co-ε-caprolactone) (PLLGC) random terpolymer microspheres; their in-vitro degradation behaviors, including the changes of pH value, mass loss, molecular mass and surface morphology, were investigated during various degradation periods and compared with poly(lactic-co-glycolic acid) (PLGA) microspheres. The results showed that the introduction of the ε-caprolactone (ε-CL) unit reduced the degradation rate of the PLGA polymers. Therefore, we suggest the PLLGC microspheres with controllable degradation rate could supply a wider application future in drug delivery field than pure PLGA microspheres.
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高影响因子
Journal of Macromolecular Science Part B-Physics
·
2021
·
IF 1.504
Chao Zhang,Zhihua Zhou,Wenjuan Liu,Tianlong Huang,Yanmin Zhao,Ping Chen,Ziwei Zhou,Dan Wang,Meiling Yi,Jianjun Fang
Porous microspheres have interconnecting external and internal pore structure resulting in enormous specific surface area and have drawn attention for drug delivery. In this work, poly(l-lactide-co-glycolide-co-ε-caprolactone) (PLLGC) porous microspheres were prepared by a combined solvent evaporation and particle leaching method using gelatin as a porogen. The effects of preparation parameters on the morphologies of the porous microspheres were studied. The resultant microspheres showed porous surfaces and a three-dimensional internal network structure with interconnecting pores. The porous microsphere size decreased with increasing stirring speed and decreasing PLLGC concentration. There were fewer micropores on the surfaces of the microspheres with increasing temperature. The number of the pores and pore size on the surface of the microspheres increased with increasing gelatin content. By appropriate control of these factors (stirring speed 300 rpm, PLLGC solution concentration 1.0 wt%, temperature 0 °C, and gelatin concentration 7.5 wt%), a suitable porous microsphere, with a mean diameter of 200 μm, was prepared as a potential drug delivery agent.
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高影响因子
Advanced Science
·
2025
·
IF 14.1
Lili Liu,Chen Wang,Luxin Zhao,Yayun Xiao,Weiwei Fang,Lanling Zhao,Faxing Wang,Yuping Wu
The practical development of Li-O 2 batteries (LOBs) urgently needs to explore robust cathode catalysts to boost the sluggish Li 2 O 2 reaction kinetics and parasitic reactions despite their theoretically high specific energy. Profound understanding of the cathode properties and the battery performance is rather critical in developing rational-designed electrocatalysts. In this study, a Co-N x /Co (111) decorated N-doped hierarchical carbon framework (Co-N x /Co@NHCF) is proposed as an efficient cathode in LOBs. Spectroscopic analysis coupled with experimental results suggests that the Co-N x /Co (111) catalytic center can significantly reduce the battery overpotential, and meanwhile, the hierarchical carbon framework ensures rapid mass transportation and provides sufficient space to accommodate Li 2 O 2 deposition. Density functional theory calculations reveal that the incorporated Co (111) facet can effectively regulate the electronic distribution of N-carbon, optimize the adsorption of desirable intermediates, and eventually facilitate oxygen reduction reaction/oxygen evolution reaction kinetics. As expected, the Co-N x /Co@NHCF catalyzed LOBs deliver a high discharge/charge capacity of 6.15/ 6.22 mAh cm −2 with a columbic efficiency of 98.9%, along with a high rate cycling of 700 h at 0.3 mA cm −2 . This work provides valuable instruction for the rational design of efficient catalysts for high-performance LOBs via optimization of the crystal structure and the adsorption of intermediates.
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DOI
PubMed
高影响因子
FUEL
·
2022
·
IF 8.035
Yongtao Zhang,Fulin Chen,Yan He,Fei Wang
CO 2 sequestration based on hydrate technology is considered to be the most promising long-term CO 2 sequestration technology. In this study, a method of using initial stirring to activate CO 2 hydrate formation process was proposed in the aim of saving energy and avoiding the problem of stirring shaft stuck, where the stirring only played a role in activating hydrate formation process. Two amino acids, l -Methionine and d -leucine, were chosen as promoters for improving the formation kinetics of CO 2 hydrates, and l -Methionine presents better than d -leucine. When the concentration of l -methionine solution is equal to or greater than 4 mmol/L, even with the initial stirring of 10 rpm within 8 min, T 90 can be shortened to close to or less than 40 min with a high gas consumption of more than 7.3 mmol gas/mL water, where the promoting effect is similar to the condition of continuous stirring of about 100 min, indicating that about 90 % of the energy consumed for mechanical stirring can be saved. Moreover, an interesting phenomenon was observed that CO 2 hydrates firstly nucleated inside the l -methionine solution, and a large number of small hydrate floccules rapidly formed and filled the entire solution under the action of magnetic stirring, which proved the instantaneous excitation effect of stirring on hydrate formation. This work contributes to rethinking the promoting roles of stirring and promoters in CO 2 hydrate formation.
研究领域:
环境科学
·
能源化学
·
物理化学
·
气体水合物
·
碳捕集与封存
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高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2019
·
IF 7.65
Shizong Wang,Haiyang Liu,Jianlong Wang
In this study, nitrogen, sulfur and oxygen co-doped carbon armored cobalt sulfide (Co/Co 9 S 8 @N-S-O-C) composite was synthesized, characterized and used to activate peroxymonosulfate (PMS) for the degradation of sulfamethoxazole (SMX). SMX (0.04 mM) can be completely degraded within 20 min in the presence of 0.8 mM PMS and 0.1 g/L Co/Co 9 S 8 @N-S-O-C composite. The first-order kinetics constant of SMX degradation was 0.307 min -1 , and the mineralization of SMX was 30.1 %. The Quenching experiments of the free radicals and the identification of degradation products demonstrated that sulfate radicals played a dominant role in SMX degradation. The degradation rate of SMX increased with temperature, and activation energy was calculated to be 48.6 kJ/mol. The degradation rate of SMX increased firstly then decreased with increase of pH. Chloridion and humic acid decreased the degradation rate of SMX no matter what their initial concentration was. The effect of carbonate on SMX degradation depended on its initial concentration. Co/Co 9 S 8 @N-S-O-C composite showed good stability, the removal efficiency of SMX was 98.4 % in the fifth experiment. Based on the characterization results of the catalyst before and after use, it was concluded that cobalt, sulfur, pyridnic N and graphitic N were responsible for PMS activation.
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DOI
PubMed
高影响因子
IRANIAN POLYMER JOURNAL
·
2019
·Vol. 28
·期 11
·957-967
·
IF 1.707
Yang Xiaoli,Wang Kunyan,Yan Lei,Yu QiNing,Xia Hongxia,Liu Yanbo,Yan Chengjun
Multi-stimuli-responsive hydrogels are being increasingly studied due to their sensitive response to small stimuli and wide applications in biosensors and drug delivery. In this study, a multi-stimuli-responsive hydrogel, poly(hydroxyethyl methacrylate- co - N -vinyl pyrrolidone- co -methacrylic acid- co - N -isopropylacryl amide) [poly(HEMA- co -NVP- co -MAA- co -NIPA)], was synthesized by radical polymerization and characterized by Fourier transform infrared (FTIR) and 13 C NMR spectroscopy techniques. With the aids of scanning electron microscopy (SEM) characterization, it was confirmed that the sensitive stimuli-responsive behavior of the hydrogel stemmed from its microstructure variation with those external stimulus. Rheological study showed that the hydrogel had rheological feature of typical elastomer. Compression tests revealed that the poly(hydroxyethyl methacrylate- co - N -vinyl pyrrolidone) [poly(HEMA- co -NVP)] played an important role in enhancing the compressive modulus of such hydrogel. More interestingly, the equilibrium swelling ratio (ESR) studies further confirmed that the composite hydrogel displayed response sensitively to the stimulus of temperature, pH, and ionic strength. Herein, theophylline as a drug model was adopted due to the multi-stimulus properties of hydrogels, which were a potential candidate for drug loading and delivering. Releasing drug continuously in a given period was dependent on the characteristics of solution and loading time. The mechanisms for drug release from the hydrogels were studied by Ritger–Peppas model.
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高影响因子
Journal of Macromolecular Science Part B-Physics
·
2022
·
IF 1.366
Yun Ou,Wei Wu,Zhihua Zhou
In this work a novel type of composite scaffolds based on poly(lactide-co-glycolide-co-ε-caprolactone) (PLLGC), 1,4-butanediamine modified poly(lactide-co-glycolide) (BMPLGA), nanobioactive glass (NBAG) and β-tricalcium phosphate (β-TCP) were fabricated by using a thermally induced phase separation (TIPS) method. The in-vitro degradation behaviors were investigated by immersing the scaffolds in phosphate buffered saline (PBS, pH = 7.27) solution at 37 °C for 40 days. The properties, including the PBS pH value change and the water uptake, mass loss and morphology changes of the composite scaffolds, were investigated by comparing with pure PLLGC/BMPLGA scaffolds. The introduction of NBAG and β-TCP nanoparticles decreased the degradation rate of the PLLGC/BMPLGA matrix and improved the wetting behavior. The decrease in the degradation rate of the composite scaffolds correlated well with the results obtained from mass loss, water uptake and pH measurements. The degradation rate of the PLLGC/BMPLGA polymer in the composite scaffolds decreased as a result of the alkaline effect of the NBAG and β-TCP particles, with the OH- ions formed neutralizing acidic polymeric degradation products and binding the H+ ions from the tissue fluids.
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高影响因子
Journal of Macromolecular Science Part B-Physics
·
2020
·
IF 0.911
Dan Wang,Jianjun Fang,Wenjuan Liu,Tianlong Huang,Yanmin Zhao,Jianglong Duan,Hailin Xie,Ping Chen,Ziwei Zhou,Zhihua Zhou
Poly(L-lactide-co-glycolide-co-ε-caprolactone) (PLLGC) and 1,4-butanediamine modified maleated poly(D,L-lactide-co-glycolide) (BMPLGA) were both synthesized by ring-opening polymerization with stannous octoate as catalyst. Then PLLGC/BMPLGA blend porous films were prepared by using NaCl particles as a porogen through a solvent casting/particle leaching method. The PLLGC/BMPLGA blend porous films were characterized by Fourier transform infrared spectroscopy, gel permeation chromatography and scanning electron microscopy. The tensile properties of the PLLGC/BMPLGA porous films were also studied. The results showed that the content and size of the NaCl porogens had significant effects on the porosity of the PLLGC/BMPLGA porous films. The tensile strength and elongation percentage of the porous films decreased with increasing porogen content. Thus, both the pore structure and mechanical properties of the porous PLLGC/BMPLGA blend films can be controlled by changing the amount and size of the porogen.
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高影响因子
WATER AIR AND SOIL POLLUTION
·
2026
·Vol. 237
·期 13
·750
·
IF 3.5
Meng Chunhui,Li Yuena,He Qitong,Hao Yue,Yin Wenjun,Zhou Huang,Li Ping
Titanium dioxide (TiO 2 )-mediated photodynamic therapy has emerged as a promising antibacterial strategy. To further enhance the photocatalytic activity of TiO 2 , we have rationally designed cobalt-doped TiO 2 nanocomposites (C/Co/TiO 2-x ) via a sol–gel synthesis approach. The synthesized materials were systematically characterized using transmission electron microscopy (TEM), scanning electron microscopy (SEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and UV–Vis diffuse reflectance spectroscopy (UV–Vis DRS). Structural analyses confirmed the presence of Ti, O, C, and Co elements, exhibiting a block-like morphology with a dominant anatase crystalline phase. Notably, the optimized material exhibits an extended visible-light absorption edge (762 nm) accompanied by a reduced band gap (1.63 eV), demonstrating significantly enhanced visible-light harvesting efficiency. Antibacterial evaluations revealed that the C/Co/TiO 2-x nanocomposite (5 mg/mL) achieved complete inactivation of Staphylococcus aureus ( S. aureus ) and Escherichia coli ( E. coli ) within 60 and 100 min, respectively, under visible-light irradiation (7 W LED). Radical trapping experiments identified photogenerated holes (h + ) and hydroxyl radicals (·OH) as the predominant reactive species responsible for bacterial inactivation. In vitro cytotoxicity assessment demonstrated excellent biocompatibility of the material. This study successfully illustrates the synthesis of C/Co/TiO 2-x nanocomposites, which exhibit promising potential for antibacterial applications.
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高影响因子
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