CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Jun Song,Xiaohui Wu,Meng Zhang,Cheng Liu,Jianyong Yu,Gang Sun,Yang Si,Bin Ding
Functional semiconductor nanomaterials modified TiO 2 fibrous membranes with desirable heterostructures, good mechanical properties, and superior visible-light-driven photocatalytic activity would have broad applications in environmental remediation; however, constructing such fantastic fibrous membranes still remains an enormous challenge. Herein, we fabricated a soft and heterostructured g-C 3 N 4 @Co-TiO 2 (CNCT) nanofibrous membranes by a facile electrospinning approach and subsequent thermal polymerization process. The ultrathin g-C 3 N 4 nanoshell was in situ synthesized and uniformly wrapped onto Co-TiO 2 nanofiber to form core-shell quantum heterojunction , and the thickness and loading amount of g-C 3 N 4 nanoshell can be precisely controlled through simply regulating the content of precursor (melamine). Benefiting from the three-dimensional porous networks, enhanced visible-light response, and the effective charge transfer induced by uniform and compact heterojunction, the as-synthesized CNCT membranes exhibited a prominent photodegradation efficiency of 90.8% within 60 min towards tetracycline hydrochloride, and also displayed excellent antibacterial performance with a 6 log inactivation of E. coil after 90 min visible light exposure. Moreover, the stable core-shell structures and robust mechanical strength also endow the membranes with favorable reversibility and easy-recycling ability. This study may open up new avenues for designing and constructing flexible high-performance photocatalytic membranes for water purification.
研究领域:
环境科学
·
材料科学
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DOI
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.
研究领域:
高分子科学
·
生物材料
·
组织工程
·
材料表征
·
聚合物共混
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DOI
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.
研究领域:
生物材料
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组织工程
·
高分子科学
·
生物医学工程
·
体外降解
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DOI
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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产品关联
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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产品关联
DOI
高影响因子
Journal of Physical Chemistry C
·
2019
·
IF 4.309
Xueyang Song,Li Huang,Wenxue He,Chengyong Liu,Fengchun Hu,Yong Jiang,Zhihu Sun,Shiqiang Wei
Electronic metal–support interactions (EMSIs) have opened a new way to tailor the electronic and catalytic properties of supported catalysts. Herein, we demonstrate the EMSIs between Pt nanoparticles and Co(OH)2 flakes grown on SiO2 and show its beneficial effect on enhancing the CO oxidation activity. The EMSI characteristics of the Pt–Co(OH)2/SiO2 catalyst are identified by in situ X-ray absorption fine structure (XAFS) spectroscopy, in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS), and transmission electron microscopy. Quantitative XAFS analysis reveals the presence of metallic-like Pt–Co bonds. The formation of Pt–Co intermetallic bonds allows for electron donation form Co to Pt, leading to the negative charging of the Pt atoms as evidenced by reduced Pt 2p-to-5d electron-transition intensity detected by XAFS spectroscopy and the emergence of a CO adsorption band at 2063 cm–1 in DRIFTS. The significance of EMSIs is manifested by comparing the CO oxidation activity over the Pt–Co(OH)2/SiO2 and Pt/SiO2 catalysts with similar Pt loadings. Pt–Co(OH)2/SiO2 is superior to Pt/SiO2 in both the apparent activation energy (19 vs 64 kJ/mol) and the turnover frequency (0.03 vs 0.003 s–1 at 37 °C). The enhanced activity is attributed to the negative charging of Pt, which downshifts the d-band center and reduces the CO adsorption strength.
研究领域:
催化化学
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材料科学
·
纳米技术
·
表面化学
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DOI
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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DOI
高影响因子
Catalysis Science & Technology
·
2025
·
IF 4.2
Canyang Zhang,Yin Liang,Chao Chen,Wei Zhao,Bolong Li,Jianghao Wang,Zhenyu Zhang,Huiping Ji,Feng Zhou,Kaige Wang,Reinout Meijboom,Jie Fu
The decarbonylation of biomass-derived fatty acids (CnH2n+1COOH) presents a sustainable method for producing high-value alkenes (CnH2n). However, the development of efficient and highly selective catalysts for fatty acid decarbonylation remains challenging. In this work, we prepared a series of CoPhPhen/MWCNT-X catalysts by pyrolyzing a 4,7-diphenyl-1,10-phenanthroline (PhPhen) Co complex immobilized on multi-walled carbon nanotubes. In the model decarbonylation reaction of stearic acid, the optimized CoPhPhen/MWCNT-900 catalyst demonstrated remarkable catalytic efficacy, with 81.6% conversion of stearic acid and 58.3% yield of heptadecene. Characterization and comparative experiments demonstrated that the substantial phenyl groups in the PhPhen ligand engage in strong π-π interactions with the MWCNT, effectively inhibiting the migration and aggregation of cobalt single atoms during pyrolysis and thus maintaining a high density of active Co single-atom sites. Further electronic structure investigation revealed that the local electron density around the cobalt species markedly rises with higher pyrolysis temperatures, and this electronic impact exhibits a distinct positive association with the decarbonylation performance of catalysts. In situ DRIFTS was employed to reveal the adsorption and reaction process of fatty acids on the Co single-atom active sites: The fatty acid molecule first coordinates to the cobalt center via the carbonyl oxygen, followed by successive dehydration and decarbonylation processes, finally yielding H2O, CO, and olefins.
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Qin Li,Jinghan Sun,Aiguo Kong,Rui Liu
Reasonable heterogeneous interface engineering is crucial for achieving efficient and robust oxygen reduction reactions (ORR). Herein, a ferrocene enhanced interface coupling catalyst has been successfully developed, which consists of cobalt‑nitrogen-doped carbon dodecahedra (Co@NC) with cobalt-ferrocene MOF nanosheets (Co-FcDC). The Co@NC/Co-FcDC catalyst demonstrates superior ORR electrocatalytic activity with a half-wave potential of 0.82 V and a good durability. This promoted performance is attributed to the Fc-enhanced interface coupling interaction between Co-FcDC and Co@NC, which optimizes the electron structure of Co nanoparticles (NP s), increases oxygen adsorption, and reduces the energy barrier for converting O-containing intermediates (*OH) into OH − . This research offers a valuable perspective for the reasonable construction of ferrocene-based heterogeneous interfaces for energy storage and conversion.
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产品关联
DOI
高影响因子
Materials Research Express
·
2020
·Vol. 7
·期 2
·025010
·
IF 1.929
Hong-Wei He,Xin-Yuan Li,Zhao-Jun Zhao,Xu Yan
Polymer template method is a general and facile to fabricate nano-structural matters. Some amphiphilic polymers or co-polymers were used as templates to synthesize nano-silica. In this contribution, polymethacrylate (PMMA) employed was a commercial hydrophobic acrylate polymer and grafted with a strong hydrophilic polyethyleneimine (PEI, a densely amino-groups polymer) via aminolysis reaction, which was monitored and identified by means of FT-IR. The aminolysis reaction was optimized and the suitable reaction time was 12 h at 110 °C. The obtained copolymer, PMMA-co-PEI was applied as a template to prepare nano-silica spheres that was characterized by a scanning electron microscope (SEM). When the dosage was 1 wt% of purified PMMA-co-PEI, the resultant nano-silica had uniform particle size, and average diameter of 311 nm. When the dosage of PMMA-co-PEI was increased to 2 wt% or 4 wt%, the resultant particles became bigger and inclined to aggregate. Nano-silica afforded by this template method will be a promising material in application of catalysis, energy, biology and chromatographic analysis and the copolymer of PMMA-co-PEI will be a template for producing metal oxide nano-spheres.
研究领域:
材料科学
·
化学工程
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DOI
高影响因子
JOURNAL OF ELECTRONIC MATERIALS
·
2022
·Vol. 52
·期 2
·1375-1384
·
IF 2.047
Shi Chonghua,Fu Hang,Nie Jiajin,Yao Shaowei
A composite material of Co/N-doped porous carbon was derived from a zeolite imidazolate framework (Zn/Co-ZIF) precursor, which exhibited a controllable microstructure and high specific surface area. In order to study the microwave absorption properties of the composites, the Zn/Co-ZIFs were heat-treated at 930°C in a N 2 atmosphere to obtain the composites, in which Co nanoparticles were distributed uniformly in N-doped porous carbon (Co/C composites). Through N 2 adsorption and desorption testing, the specific surface area of the Co/C composites was about 333.5 m 2 g −1 , and the Barrett−Joyner−Halenda (BJH) pore size distribution was 5.7131 nm, with the majority of pores at mesoporous scale. The microwave absorption properties of Co/C composites with different content were then analyzed, revealing that the Co/C composite with absorbent content of 15 wt.% had the smallest reflection loss (−46.36 dB) at a thickness of 3.1 mm. Based on these results, the Co/C composites not only have the advantages of high specific surface area and special porous structure, but with the appropriate absorbent content, the Co/C composites show excellent microwave absorption performance.
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产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL SCIENCES
·
2022
·Vol. 134
·期 2
·1-11
·
IF 2.15
Yu Miao,Ji Shuai,Li Zhifang,Song Kun,Li Yueyu,Yang Jian,Yang Changlong
A simple ion-exchange method is used to prepare Mn and Co-supported TNU-9 denitration catalyst for NH 3 -SCR. The denitration activity and H 2 O/SO 2 resistance performance of the catalyst are systematically studied. The denitration activity test exhibits that the NO x removal rate of Mn-Co/TNU-9 is higher than that of Mn/TNU-9 and Co/TNU-9, the NO x removal rate is greater than 90% and the N 2 selectivity is greater than 99% in the range of 150 ~ 450 °C. It is because the redox cycle of Mn 4+ + Co 2+ ↔ Mn 3+ + Co 3+ improves the redox performance of the catalyst, which is conducive to the conduction of electrons, and then accelerates the oxidation of NO to NO 2 to produce a "fast SCR" reaction, and finally optimizes the overall SCR performance. Furthermore, the change is not significant for the catalytic activity over Mn-Co/TNU-9 in the presence of water. However, the sulfur resistance is poor at low temperatures due to the presence of ammonium bisulfate. It also has excellent catalytic stability. Therefore, supported TNU-9 catalysts will have a good development prospect in denitrification. Graphical abstract Mn-Co co-doped TNU-9 catalyst was successfully synthesized by simple ion exchange method and applied in the NH 3 -SCR. The results show that Mn-Co/TNU-9 catalyst has an excellent wide activity window in a wide temperature range of 150-450°C (NO x conversion over 90%), which is because Mn+Co 2+ ↔Mn+Co improves the redox performance and facilitates the electron transfer, which further accelerates the oxidation of NO into NO 2 that could result in the “Fast SCR” reaction. The synergistic effect between Mn and Co bimetallic can also improve activity. Moreover, Mn-Co/TNU-9 has very good catalytic stability.
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DOI
高影响因子
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