COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2021
·
IF 4.539
Ruxia Song,Shihong Zhang,Yi He,Hongjie Li,Yi Fan,Teng He,Yihan Zhang,Yuxin Xiang,Huili Zhang
Ni-Cu/H-MWCNTs composite coatings with outstanding corrosion resistance and high wear resistance were prepared by the pulse electrodeposition technology. The micro-surface morphology and corrosion behavior of the coatings were represented by high-resolution field emission scanning electron microscopy , potential polarization curve, electrochemical impedance spectroscopy and scanning electrochemical microscope. The chemical composition and crystal structure of the coatings were characterized by energy dispersive spectrum, X-ray photoelectron spectroscopy and X-ray diffraction. The mechanical properties are studied by digital microhardness tester and multifunctional material surface testing machine. We found that the successful doping of H-MWCNTs changed the micro-structure and morphology of the Ni-Cu-based coating, making the coating smoother and denser. Furthermore, the average crystallite size of the Ni-Cu/H-MWCNTs (0.5 g/l) composite coating is 13.28 nm. The microhardness and average friction coefficient of the composite coating (0.5 g/l) are 587.04 Hv and 0.178, respectively. It was also found that the composite coating (0.5 g/l) has the best anti-corrosion performance, which is 3.2 times that of the pristine Ni-Cu-based coating. Through SECM diagrams, the composite coating (0.5 g/l) has excellent pitting resistance in 3.5 wt % NaCl solution.
研究领域:
材料科学
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电化学
·
表面工程
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DOI
高影响因子
RSC Advances
·
2020
·Vol. 10
·期 44
·26142-26150
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IF 3.119
Binyu Xu,Samuthirarajan Senthilkumar,Wei Zhong,Zhongquan Shen,Chunxin Lu,Xiaoming Liu
In this work, core–shell Fe3O4@Cu2O and Fe3O4@Cu2O–Cu nanomaterials for aerobic oxidation of benzylic alcohols are reported with 2,2,6,6-tetramethylpiperidine-N-oxyl (TEMPO) and N-methylimidazole (NMI) as the co-catalysts. To anchor Cu2O nanoparticles around the magnetic particles under solvothermal conditions, the magnetic material Fe3O4 was modified by grafting a layer of L-lysine (L-Lys) to introduce –NH2 groups at the surface of the magnetic particles. With amine groups as the anchor, Cu(NO3)2 was used to co-precipitate the desired Cu2O by using ethylene glycol as the reducing agent. Prolonging the reaction time would lead to over-reduced forms of the magnetic materials in the presence of copper, Fe3O4@Cu2O–Cu. The nanomaterials and its precursors were fully characterized by a variety of spectroscopic techniques. In combination with both TEMPO and NMI, these materials showed excellent catalytic activities in aerobic oxidation of benzylic alcohols under ambient conditions. For most of the benzylic alcohols, the conversion into aldehydes was nearly quantitative with aldehydes as the sole product. The materials were recyclable and robust. Up to 7 repeat runs, its activity dropped less than 10%. The over-reduced materials, Fe3O4@Cu2O–Cu, exhibited slightly better performance in durability. The magnetic properties allowed easy separation after reaction by simply applying an external magnet.
研究领域:
材料科学
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催化
·
化学工程
·
纳米技术
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DOI
PubMed
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2019
·
IF 3.375
Yong Sun,Caixia Xiong,Quanchang Liu,Jiaren Zhang,Xing Tang,Xianhai Zeng,Shijie Liu,Lu Lin
Compared to biomass-derived 5-hydroxymethylfurfural (HMF), 5-formyloxymethylfurfural (FMF) is highly potential as feedstock to produce 2, 5-dimethylfuran (DMF) due to its properties of higher stability and enhanced hydrophobicity. Herein, catalytic conversion of FMF to DMF over Ni–Cu bimetallic catalyst with formic acid (FA) as hydrogen donor was investigated. A favorable DMF yield of 71.0% was obtained by catalyst 36Ni-12Cu/SBA-15. The conversion of FMF to DMF was controlled by surface reaction on the catalyst. In addition, catalytic mechanism investigation showed that the excellent catalytic performance and recyclability of catalyst were attributed to the formation of Cu–Ni alloy and its synergistic role. The incorporation of Cu and Ni substantially improved the selectivity of hydrogenolysis toward C–O ester bond. Meanwhile, FMF exhibited a better advantage to substitute HMF for producing DMF over Ni–Cu bimetallic catalyst with formic acid as a hydrogen donor.
研究领域:
化学工程
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生物质能
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催化科学
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DOI
高影响因子
FOOD CHEMISTRY
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2022
·
IF 9.231
Haiyang Wang,Lin Cai,Yuwei Wang,Chang Liu,Guozhen Fang,Shuo Wang
A molecularly imprinted electrochemical sensor (MIES) modified with Cu-MOF and Ti 3 C 2 Tx was successfully prepared for the detection of hygromycin B in food. According to the pH sensitive property of reversible borate ester bonds, a molecularly imprinted polymers (MIP) were constructed on the modified gold electrode (GE) surface by electropolymerization to realize the controllable elution and adsorption of template molecules. Cu-MOF with large specific surface area and Ti 3 C 2 Tx with excellent electrical conductivity cooperate to improve the overall analytical performance of MIES. The morphology and electrochemical performance of the sensor were evaluated. Under the optimal experimental conditions, the method showed superior selectivity to hygromycin B with a linear range of 5 × 10 −9 –5 × 10 −6 M and a detection limit of 1.92 × 10 −9 M (S/N = 3). The detection results of this method are in good agreement with HPLC-MS/MS, which proves that the method has reliable practicability and accuracy.
研究领域:
食品科学
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分析化学
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生物传感技术
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DOI
高影响因子
FUEL
·
2025
·
IF 7.5
Xiao Zhang,Xueying Zhang,Cai Liang,Feng Shen,Boxiong Shen
Water poisoning remains a significant challenge for Mn-based catalysts in the purification of low-temperature industrial flue gas. In this study, a water-resistant catalyst, Cu-doped MnO x dispersed on a flower-like hollow sphere carrier (Cu 0.1 Mn 1 -Al 2 O 3 (NF)), was developed. The introduction of 5 % water vapor into simulated flue gas reduced the o-xylene oxidation efficiency of the unmodified MnO x /γ-Al 2 O 3 catalyst by 20 %, whereas Cu 0.1 Mn 1 -Al 2 O 3 (NF) exhibited only a 5 % reduction, and it shows a water resistance surpasses those of most of the reported MnO x catalysts. Upon water vapor withdrawal, Cu 0.1 Mn 1 -Al 2 O 3 (NF) showed a 2 % irreversible efficiency loss, compared to 9 % for MnO x /γ-Al 2 O 3 . Mechanistic studies highlight the role of the flower-like morphology in reducing hydrogen-bonded H 2 O and the primary contribution of Cu + doping in suppressing –OH generation on metal sites, likely due to weakened H 2 O dissociation at Mn-Ov-Cu oxygen vacancies. Additionally, Cu 0.1 Mn 1 -Al 2 O 3 (NF) has improved water desorption capability evidenced by 8 °C lower endothermic temperature for H 2 O volatilization than that of MnO x /γ-Al 2 O 3 . Furthermore, a H 2 O-involved Mars-van Krevelen (MvK) mechanism was proposed to explain the ∼ 2 % irreversible efficiency reduction for Cu 0.1 Mn 1 -Al 2 O 3 (NF) in wet gas − attributed to H 2 O dissociation at oxygen vacancies hindered lattice oxygen replenishment. Based on this mechanism, an air-purging regeneration protocol was developed to enhance the catalyst’s operational stability under wet flue gas conditions.
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产品关联
DOI
高影响因子
RSC Advances
·
2024
·Vol. 14
·期 17
·11849-11861
·
IF 3.9
Zanji Rong,Weihua Shen,Yunjin Fang
In this work, the effect of alkaline earth metal modification on the catalytic performance of activated carbon supported Cu was investigated. The experimental results showed that the introduction of Ca and Sr improved the selectivity of methyl glycolate (MG) during hydrogenation of dimethyl oxalate (DMO) in gas phase. The optimal loading amount of Ca was 0.1 wt%, and under the optimal conditions (temperature 240 °C, pressure 2 MPa, hydrogen–ester ratio of 80, feedstock 15% DMO methanol solution, and WLHSVDMO = 0.9 h−1) the selectivity of MG was as high as 94%, and the conversion of DMO was 97%. The optimal loading of Sr was 0.2 wt% with MG selectivity up to 89% and DMO conversion of 98%. The results of catalyst characterization showed that both Ca and Sr modifications were beneficial to further reduce the particle size of Cu, improve the dispersion of Cu, increase the basicity of the catalyst, and improve the stable presence of Cu+ during the reaction process. Cu+ was beneficial to the stabilization of the MG species, in which Cu+ accounted for more in the Ca-modified catalysts Cu+/(Cu+ + Cu0) = 0.65, and in the Sr-modified ones Cu+/(Cu+ + Cu0) = 0.51. Therefore, both Ca and Sr modified catalysts showed improvement in the selectivity of MG.
研究领域:
催化化学
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材料科学
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DOI
PubMed
高影响因子
JOURNAL OF CATALYSIS
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2020
·
IF 7.888
Yanru Zhu,Jian Zhang,Xiaodan Ma,Zhe An,Shaowei Guo,Xin Shu,Hongyan Song,Xu Xiang,Jing He
Complexity of chemical linkages (C-C/C-H/C-O, C=C/C=O, or C-O-H/C-O-C) in biomass-derived molecules makes the selective activation of targeted bonds much more challenging, expecting well-defined catalysts and definite catalytically-active sites. This work demonstrates an effective gradient reduction strategy to control the definite structure of catalytically-active sites, affording defects-rich nano-twin Cu particles. This strategy just involves the reduction (calcination under H 2 ) of Cu II -containing layered double hydroxides (LDHs) simply with controlling the reduction gradient (interval time) of Cu II species in two chemical micro-environments (Cu II -O-Cu II and Cu II -O-M II/III/IV (M ≠ Cu)) in the brucite-like layer of LDHs. The nano-twin Cu particles efficiently promote the target activation of C-O and C=C in the conversion of furfural to cyclopentanone (CPO). With ~100% furfural conversion, the defects-rich nano-twin Cu particles afford a CPO selectivity of 92%, 50% higher than regular spherical Cu particles. The multi-stepped defect sites, originating from the planar defects, play a decisive role in promoting the CPO selectivity by facilitating the hydro-deoxygenation to C-O of 4-hydroxycyclopentenone (HCP) and hydrogenation to C=C of HCP or cyclopentenone.
研究领域:
催化化学
·
材料科学
✓ 已验证
DOI
高影响因子
Journal of Environmental Chemical Engineering
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2021
·
IF 5.909
Mingran Li,Xia Qin,Jiaxin Cui,Rui Guo,Chengrui Guo,Ziyuan Wang,Tinghui Li
In this study Cu-Fe bimetallic aerogel-like carbon based on sodium alginate (SA) was prepared as catalytic particle electrode by freeze-drying and carbonization process. The characterization indicates that Cu and Fe were loaded on the surface and inside SA-based biomass carbon (SAC) in the form of a zero-valent copper-iron alloy to form a Cu-Fe/Sodium alginate Carbon (Cu-Fe/SAC) particle electrode. After using a three-dimensional Electro-Fenton (3D-EF) system with the prepared particle electrode, the optimal experimental operating parameters for removal of fulvic acid (FA) were obtained as follows: voltage 2.5 V, pH 5.4, and catalyst dosage 4 g/L. A removal efficiency from 82.9% to 74.4% for FA was achieved in a wide pH range of 3–7. Comparison experimental results indicate that the 3D-EF system with bimetallic Cu-Fe/SAC as the catalytic particle electrode (CPE) has higher FA degradation rate and mineralization efficiency than two-dimensional Electro-Fenton (2D-EF) system, even higher than the 3D-EF system with Cu/SAC or Fe/SAC. Hydroxyl radicals (·OH) trapping experiments showed that the main contribution to FA degradation and mineralization in the 3D-EF system would be the ·OH radical produced by a heterogeneous Fenton-like reaction. The comparison and trapping experiment results indicate that the possible mechanism of the 3D-EF with Cu-Fe/SAC as CPE for FA degradation may involve adsorption, anode oxidation, heterogeneous and homogeneous Fenton-like reactions.
研究领域:
环境科学
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化学工程
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DOI
高影响因子
Materials Today Bio
·
2025
·
IF 10.2
Wei Liu,Yuan Fang,Ping Xu,Wanqin Cai,Yunping Peng,Wei Xue,Siming Yu
Recently, chemodynamic therapy (CDT) and gas therapy (GT) have garnered significant attention for antibacterial applications. However, effectively integrating CDT and GT into a single nanocomposite for synergistic therapy remains challenging. Herein, Cu-Fe bimetallic peroxide nanoparticles (CFp)-decorated hollow polydopamine (HPDA) nanozyme (CFp/HPDA) was fabricated and used as the carrier for nitric oxide (NO) donor BNN6 loading, resulting in the NO-releasing nanozyme of CFp/HPDA@BNN6. In the acidic bacterial infection microenvironment (BIME), CFp could rapidly dissociate by releasing Cu + and Fe 2+ ions and self-supplying abundant H 2 O 2 . On one hand, the Fenton - like catalytic reaction enabled the generation of a high level of hydroxyl radical (•OH) for CDT. On the other hand, H 2 O 2 could effectively trigger BNN6 to release NO for NO-based GT. Consequently, CFp/HPDA@BNN6 exhibited remarkable antibacterial and antibiofilm activities by exerting the bimodal GT/CDT therapy. In-depth mechanism study revealed that NO synergized the antibacterial effect of •OH by promoting bacterial ferroptosis-like death. Moreover, CFp could responsively produce a substantial amount of O 2 in the BIME, which, in combination with NO, synergistically promoted wound healing by reprogramming M1-type macrophages, downregulating hypoxia-inducible factor (HIF)-1α expression and upregulating vascular endothelial growth factor (VEGF), α-SMA and CD31 expressions. In summary, CFp/HPDA@BNN6 displayed highly efficient treatment of wound infections through the trimodal therapeutic effects of •OH, NO and O 2 , offering a promising strategy for wound infection therapy.
研究领域:
生物医学工程
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纳米医学
·
抗菌疗法
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF RARE EARTHS
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2020
·
IF 3.104
Di Deng,Shujun Deng,Dandan He,Zhiheng Wang,Zhipeng Chen,Yi Ji,Guoping Yan,Guangjin Hou,Licheng Liu,Hong He
Ce- or La-doped Cu/SSZ-13 catalysts were prepared by a hydrothermal method and Cu, Ce or La ions were incorporated through stepwise ion exchange. The catalyst activity was measured for the ammonia selective catalytic reduction reaction. The structure and composition of catalyst were characterized by using X-ray diffraction, scanning electron microscopy, inductively coupled plasma mass spectrometry solid-state NMR, NH 3 -TPD techniques, and the active components were examined by XPS and XANES . The results indicate that the Ce and La doping can both completely preserve the SCR activity of Cu/SSZ-13 above 300 °C, but there is also a decrease of activity below 200 °C. On the other hand, Ce doping is beneficial to the formation of framework aluminum , stabilizes molecular sieve framework and Cu active sites of Cu/SSZ-13, thereby improves the catalyst hydrothermal stability. But La doping will decrease the amount of framework aluminum and Cu active sites of Cu/SSZ-13 after hydrothermally aging, even destroy zeolite CHA structure. This is quite harmful to the catalyst hydrothermal stability.
研究领域:
催化
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环境化学
·
材料科学
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2022
·
IF 8.025
Zhan Shu,Cencen Zhang,Lizhao Yan,Haoqi Lei,Caixing Peng,Shuang Liu,Lihong Fan,Yingying Chu
Repair of periodontal and maxillofacial bone defects is a major challenge in clinical. Guided bone regeneration (GBR) is considered one of the most effective methods. However, the efficacy of currently available GBR membranes for repair is frequently limited by their poor osteogenic potential and lack of antibacterial activity. The first step in this investigation was to construct a zinc-based zeolite-imidazolate framework loaded with copper ions ( [email protected] ). Following that, a novel polycaprolactone/polylactic acid/nano-hydroxyapatite/ [email protected] (PCL/PLA/n-HA/ [email protected] ) GBR membrane was developed using a simple porogen with nonsolvent-induced phase separation (NIPS) approach. The produced membrane with asymmetric porous structure (one smooth side and one rough side) possesses hydrophilicity corresponding to the roughness of its two sides. The superior mechanical property, stability of degradation, and ion release capability of the membrane all contribute to the clinical feasibility. Additionally, in vitro biological experiments demonstrated that the PCL/PLA/n-HA/ [email protected] membrane had favorable osteogenic and antibacterial properties, which suggests the high potential for application in the GBR procedure.
研究领域:
牙科材料
·
生物材料
·
组织工程
·
生物医学工程
✓ 已验证
DOI
PubMed
高影响因子
International Journal of Nanomedicine
·
2024
·
IF 6.6
Ying Yang,Bixia Zhou,Min Li,Yishuai Sun,Xulei Jiang,Xinxin Zhou,Chengjun Hu,Dou Zhang,Hang Luo,Wuyuan Tan,Xinghua Yang,Shaorong Lei
Purpose The treatment of craniofacial bone defects caused by trauma, tumors, and infectious and degenerative diseases is a significant issue in current clinical practice. Following the rapid development of bone tissue engineering (BTE) in the last decade, bioactive scaffolds coupled with multifunctional properties are in high demand with regard to effective therapy for bone defects. Herein, an innovative bone scaffold consisting of GO/Cu nanoderivatives and GelMA-based organic-inorganic hybrids was reported for repairing full-thickness calvarial bone defect.Methods In this study, motivated by the versatile biological functions of nanomaterials and synthetic hydrogels, copper nanoparticle (CuNP)-decorated graphene oxide (GO) nanosheets (GO/Cu) were combined with methacrylated gelatin (GelMA)-based organic-inorganic hybrids to construct porous bone scaffolds that mimic the extracellular matrix (ECM) of bone tissues by photocrosslinking. The material characterizations, in vitro cytocompatibility, macrophage polarization and osteogenesis of the biohybrid hydrogel scaffolds were investigated, and two different animal models (BALB/c mice and SD rats) were established to further confirm the in vivo neovascularization, macrophage recruitment, biocompatibility, biosafety and bone regenerative potential.Results We found that GO/Cu-functionalized GelMA/β-TCP hydrogel scaffolds exhibited evidently promoted osteogenic activities, M2 type macrophage polarization, increased secretion of anti-inflammatory factors and excellent cytocompatibility, with favorable surface characteristics and sustainable release of Cu2+. Additionally, improved neovascularization, macrophage recruitment and tissue integration were found in mice implanted with the bioactive hydrogels. More importantly, the observations of microCT reconstruction and histological analysis in a calvarial bone defect model in rats treated with GO/Cu-incorporated hydrogel scaffolds demonstrated significantly increased bone morphometric values and newly formed bone tissues, indicating accelerated bone healing.Conclusion Taken together, this BTE-based bone repair strategy provides a promising and feasible method for constructing multifunctional GO/Cu nanocomposite-incorporated biohybrid hydrogel scaffolds with facilitated osteogenesis, angiogenesis and immunoregulation in one system, with the optimization of material properties and biosafety, it thereby demonstrates great application potential for correcting craniofacial bone defects in future clinical scenarios.
研究领域:
材料科学
·
生物医学工程
·
组织工程
·
再生医学
✓ 已验证
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）