COLLOIDS AND SURFACES B-BIOINTERFACES
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2021
·
IF 5.268
Yuhang Yuan,Wenting Cai,Jiaxin Xu,Jianhua Cheng,Ke-Si Du
Copper-based MOF (Cu-PABA) was selected to immobilize laccase (Lac) at optimum pH because of its favorable acid resistance. Cu-PABA@Lac biocomposites were synthesized in situ by the one-step method under moderate conditions (water environment and normal temperature and pressure). Cu-PABA@Lac had great potential to maintain stability due to the protection of the Cu-PABA shell and reasonable conformational changes. In addition, Cu-PABA@Lac could be used repeatedly by centrifugation, as confirmed in the degradation experiment of bisphenol A (BPA). Because of the synergistic effect of copper ions between laccase and Cu-PABA, the K m value decreased (from 0.0024 to 0.0014 mM); therefore, the affinity between laccase and guaiacol was enhanced. In conclusion, the system provides a choice for immobilized acid-resistant enzymes and a solution for environmental BPA degradation.
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高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2024
·Vol. 59
·期 33
·15642-15664
·
IF 3.5
Du Zhanjie,Wang Ru,Liu Bin,Zheng Tao,Dong Yanwei,Chen Xuhua,Liu Zeyu,Han Shengxing,Zeng Yao,Li Yiken
Through Silicon Via (TSV), a kind of 3D packaging technique, can improve chip integration based on “More than Moore” scheme. The larger copper area ratio at the TSV barrier layer interface requires strong adjustability of the removal rate selection ratio of copper, tantalum and TEOS–SiO 2 , and stronger surface defect control and surface profile correction capabilities. In this paper, the effects of guanidine hydrochloride (GH) and 2,2′-[[(Methyl-1H-benzotriazol-1-yl)methyl]imino]bisethanol (TT-LYK) system on the tunability of Ta and Cu removal rate in chemical mechanical polishing (CMP) of TSV wafer barrier material were studied. GH can complex \({\text{TaO}}_{4}^{{3}-}\) , while TT-LYK can form a protective film on the surface of Cu, thereby achieving rate regulation. The results showed that when the concentration of GH increased from 0 to 2 wt%, the removal rate selectivity ratio of Ta and Cu raised from 1.02:1 to 1.26:1. When the concentration of TT-LYK increased from 2.5 to 10 mmol/L, the removal rate selectivity ratio of Ta and Cu increased from 1.33:1 to 1.79:1, which verified that the GH and TT-LYK systems can efficiently regulate the rate and rate selection ratio of Ta and Cu. Surface roughness for both metals decreased from pre-polishing values of 5.03 nm to post-polishing values of 0.37 nm for Ta, from pre-polishing values of 5.33 nm to post-polishing values of 1.26 nm for Cu indicating that GH and TT-LYK systems significantly improved the surface quality. Graphical abstract
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高影响因子
ACS Biomaterials Science & Engineering
·
2022
·
IF 5.395
Chongxian He,Xiangyang Zeng,Liuyimei Yang,Shiwei Zhong,Shuping Peng,Wenjing Yang,Cijun Shuai
Fe has immense potential for biodegradable orthopedic applications, but it degrades slowly in the physiological environment. Inducing galvanic couple by alloying Cu to Fe using ball milling is a promising approach. However, the ductile nature of Cu leads to the cold welding of a large amount of Cu powder during ball milling, which makes it difficult to disperse uniformly in the Fe matrix. Here, a Fe–CuO implant with highly dispersed Cu particles in the matrix was developed by shift-speed ball milling and selective laser melting. Specifically, copper oxide (CuO) particles were selected as precursors and dispersed in Fe powders by ball milling since they were brittle and would not be cold-welded during ball milling. After further milling in higher energy, it was found that CuO particles reacted with Fe and generated Cu particles through a stress-activated redox reaction. Subsequently, the obtained powders were prepared into a Fe–CuO implant using selective laser melting. Microstructure examination revealed that the Cu phases in the implant were dispersed evenly in the Fe matrix, which was considered to establish a large number of galvanic couples and aggravated the galvanic corrosion tendency. Electrochemical tests indicated that the implant had improved performance in degradation behavior in terms of high corrosion current density (22.4 μA/cm2), low corrosion resistance (1319 Ω cm2), and good degradation stability. In addition, it presented antibacterial effects against Escherichia coli and Staphylococcus aureus by diffusion mechanisms with killing rates of 90.7 and 96.7%, respectively, as well as good cytocompatibility.
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高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2020
·
IF 3.99
Han Jiao,Yaru Li,Kaihua Gao,Jingyu Zhao,Chun Wang,Mingcheng Li,Ping Na
Electrochemical promotion technology, an environmentally friendly and facile strategy, is becoming increasingly attractive to researchers. In this work, a novel Cu@Cu 2 O foam block composite material was constructed through a one-step hydrothermal method. The product was then employed as the anode and electrified to catalyse removal of radioactive iodide ions (I − ) in the liquid phase. The removal rate of I − sharply increased to 96.65 % under electrification, which is a 4.5-fold increase over that without electrification. The current strength had an impact on this result, and the removal was still relatively high in a wide range of pH values. The composite material had good reusability and could maintain good performance after simple separation. Therefore, based on X-ray diffraction and X-ray photoelectron spectroscopy analysis, we proposed a mechanism of electrochemical oxidation and adsorption coupling for the iodine removal. As Cu@Cu 2 O adsorbed I − to form CuI, the current flow oxidised I − to I 2 , which finally was adsorbed by the formed CuI. Therefore, the current provides services of accelerating I − movement and oxidation. This coupling model of electrocatalytic oxidation and adsorption provides us with a new research method to remove iodide from water.
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高影响因子
INTEGRATED FERROELECTRICS
·
2020
·
IF 0.557
Jianming Liu,Yao Feng,Juanjuan Yin,Tifeng Jiao
In this work, a new composite nanomaterial prepared by hydrothermal synthesis, it not only offers a convenient and stable method, but beneficial for the stable of nanomaterials. The obtained composite was explored use CNT-COOH and CuCl2, after deal with ultrasound and magnetic stirring then transferred to Teflon-lined stainless-steel autoclave for reaction. CNT-COOH not only increases the mechanical strength of the composite, but also provides a growth site of Cu nanocrystalline. The final production has a shorter reaction time for reducing 4-nitrophenol with NaBH4 than other products and has a high utilization rate. Studies have shown that the preparation of excellent nanocomposite has the potential for catalytic degradation.
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高影响因子
Environmental Science-Processes & Impacts
·
2014
·Vol. 16
·期 6
·1462-1468
·
IF 0
Lin Duan,Lingfang Li,Zhu Xu,Wei Chen
Nano-sized nickel oxide (nano-NiO) is a new nanomaterial that has shown great promise in many areas of application. Understanding its environmental fate and effects is critical for minimizing the potential environmental implications of this new material due to incidental and accidental releases in the future. In this study, we observed strong adsorption of tetracycline to nano-NiO and found that the adsorption affinity can be further enhanced by Cu(II) ions – the observed distribution coefficient (Kd) values are 103.1 to 104.2 L kg−1 in the absence of Cu(II) and 103.0 to 105.5 L kg−1 in the presence of Cu(II); such adsorption affinities are even comparable to those of tetracycline to carbonaceous materials. The strong adsorptive affinities of nano-NiO for tetracycline are likely attributable to several mechanisms, including surface complexation, cation exchange, and electrostatic attraction. As a strong complexing agent, Cu(II) can significantly enhance adsorption of tetracycline by serving as a bridging agent between tetracycline and nano-NiO. The findings of this study have important implications for the risk assessment of engineered nanomaterials – in aquatic environments nano-NiO (and likely other metal oxide nanomaterials) can strongly adsorb tetracycline antibiotics, resulting in the changes of environmental risks of the metal oxide nanomaterials and/or bioavailability of the adsorbed contaminants.
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JOURNAL OF HAZARDOUS MATERIALS
·
2021
·
IF 10.588
Jun Wu,Wenzhong Zhang,Chunping Li,Erdan Hu
The effects of Fe(III) and Cu(II) on the sorption of atrazine (AT) and prometryn (PY) on clay minerals were investigated both preloaded and in solution. For smectite , Fe(III) preloading greatly enhanced AT and PY sorption at pH 4.0 and 6.0 but diminished AT sorption at pH 8.0. Cu(II) preloading promoted AT and PY sorption under alkaline conditions but suppressed AT sorption at pH 4.0. The adverse effects were not obvious for PY. While for illite and kaolinite , Fe(III) and Cu(II) had little or promotion effects due to the lower contents of them in these two minerals. In the co-sorption studies, for smectite, AT sorption remained at pH 4.0 and increased at pH 6.0 and 8.0, while PY sorption was inhabited over the pH range of 4.0–8.0 in the presence of Fe(III). AT and PY sorption were not affected by Cu(II) except for PY at pH 8.0, in which case, the sorption was promoted. For illite and kaolinite , Fe(III) and Cu(II) generally enhanced AT and PY sorption.
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高影响因子
WATER SCIENCE AND TECHNOLOGY
·
2020
·Vol. 82
·期 4
·704-714
·
IF 1.638
Sun Jie,Xia Guotong,Yang Wenjin,Hu Yue,Shen Weibo
The radical generation properties of hydrogen peroxide and persulfate for phenol degradation were investigated under microwave irradiation using copper-doped silicon carbide (Cu/SiC) composites as catalyst. The results showed that 90% and 70% of phenol and total organic carbon (TOC), respectively, were removed within 7 min. Microwave activation of hydrogen peroxide and sodium persulfate in terms of thermal effects and accelerated electron transfer was analyzed by degradation kinetics and X-ray photoelectron spectroscopy (XPS). The microwave activation of Na 2 S 2 O 8 demonstrated that the hot spots promote decomposition of persulfate more rapidly and the rate of persulfate decomposition was more than three times the activation rate of a normal heating method. There is a synergistic effect between Cu and microwave radiation, which is highlighted by the H 2 O 2 activation; ·OH was generated due to the redox cycle between Cu(I)/Cu(II) and was responsible for phenol degradation using H 2 O 2 . High performance liquid chromatography (HPLC) analysis indicated that hydroxylation and sulfate radicals addition of phenol were the initial oxidation reaction steps of hydrogen peroxide and persulfate, respectively, followed by further oxidation to form short-chain carboxylic acids. The kinetic advantages of microwave-assisted reactions. The activation of persulfate involved thermal gradients and redox reaction simultaneously. The reaction mechanism in Na 2 S 2 O 8 -Cu/SiC system was examined.
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高影响因子
CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2024
·
IF 3.1
Bian Hang,Li Peng,Ma Yu,Liu Lin,Li Dong,Zhang Ning
In recent years, the surge in industrialization and urbanization has led to the release of a significant amount of heavy metal ions into water. These ions, when present in drinking water, can enter the human body and cause irreversible health problem. Metal-organic frameworks (MOFs) have drawn considerable attention for their outstanding ability to remove these heavy metal ions. However, MOF powders tend to aggregate in water, reducing their adsorption efficiency and potentially leading to secondary environmental pollution. In this regard, the development of MOF composites that are highly adsorptive, recyclable, and maintain stable dispensability in water is crucial for heavy metal ions removal. Herein, the in situ growth of zeolitic imidazolate framework (ZIF-8) on melamine sponge (MS) using a secondary growth method is reported. The resultant composite sponges exhibit high efficiency in adsorbing Pb(II) and Cu(II) from water and maintain good reusability. These findings offer a promising method in efficiently eliminating Pb(II) and Cu(II) from aqueous solutions.
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高影响因子
ACS Catalysis
·
2024
·
IF 11.3
Xiashuang Luo,Cehuang Fu,Shuiyun Shen,Xiaohui Yan,Liuxuan Luo,Junliang Zhang
A comprehensive understanding of the intricate surface environments of practical nanocatalysts at the atomic level is essential for advancing our knowledge of catalytic mechanisms. In this study, we investigate PtCu octahedral nanoparticles with varying microstrains engineered by Cu dispersion. A detailed analysis of the atom configuration and corresponding microstrain is conducted. The intimate mixing of Cu and Pt results in increased randomness in atom displacement within the lattice and a more pronounced distribution of alternating microstrain on the surfaces. Specifically, we observe that the PtCu concave octahedral nanoparticles with alternating microstrain demonstrate a substantial oxygen reduction reaction (ORR) activity of 3.95 mA cm–2 in area-specific activity. The significant impact of shear microstrain is further underscored, as evidenced by an 86.9% decrease in the ORR activity upon the removal of the alternating shear microstrain. This study sheds light on the effects of microstrain toward the ORR and provides valuable insights into designing advanced Pt-based electrocatalysts.
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高影响因子
CRYSTENGCOMM
·
2014
·Vol. 16
·期 38
·9075-9082
·
IF 3.858
Shuling Xu,Haibo Li,Lei Wang,Qiaoli Yue,Sun Sixiu,Jifeng Liu
In this report, Ag@Cu yolk–shell nanostructures have been synthesized through a facile one-pot hydrothermal method. The synthesis is based on the use of N,N-dimethylformamide (DMF) as both the reducing agent and solvent, in the presence of the polymer poly(vinylpyrrolidone) (PVP). The structure and composition of the yolk–shell nanostructures were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and energy dispersive spectrometry (EDS). To study the formation process of the Ag@Cu yolk–shell nanostructures, the samples obtained at various stages of the growth process were studied by TEM and XRD, and a rational growth mechanism for the Ag@Cu yolk–shell nanostructures was proposed. The as-prepared Ag@Cu yolk–shell nanostructures were used to construct non-enzymatic glucose sensors. The detecting results show that the designed sensors have well-defined, stable and fast amperometric responses to glucose.
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高影响因子
Journal of Materials Chemistry A
·
2020
·Vol. 8
·期 19
·9545-9553
·
IF 11.301
Tianhang Gu,Wei Teng,Nan Bai,Zehan Chen,Jianwei Fan,Wei-xian Zhang,Dongyuan Zhao
Bimetals have attracted considerable attention as electrocatalysts towards selective reduction of nitrate to benign dinitrogen. Design of highly efficient and stable bimetallic catalysts by taking the effects of both active sites increasing and synergistic composition into account is of paramount importance but still a grand challenge. Herein we report novel bimetallic Pd–Cu nanoparticles (NPs) incorporated in porous N-doped carbon octahedra prepared by a spatial confinement strategy of in situ pyrolysis of metal–organic frameworks with the assistance of polyvinyl pyrrolidone (PVP) as electrocatalysts achieving targeted denitrification. Pd–Cu NPs exhibit superior dispersity with a N-doped matrix and are strongly dependent on the variation of PVP, Pd precursor and pyrolysis temperature. The material shows high efficiency (∼97.1%) for the reduction of nitrate from 100 to 2.9 mg NO3−-N L−1 (well below drinking water standards of 10 mg NO3−-N L−1), and especially the selectivity over 83% for benign N2 at neutral pH within 24 h. Encapsulated and well-dispersed Pd–Cu NPs and doped N in the carbonaceous matrix synergistically enhance the interfacial electron transfer for transformation of NO3−-N(V). Porous structures endow the catalyst with outstanding stability after eight cycles and over a wide pH of 4–10. More importantly, the nanocatalyst performs well with real contaminated water (selectivity of 91% for nitrogen) in laboratory batch reactors. This nanocatalyst shows promise in wastewater treatment and environmental remediation due to the spatial confinement strategy and introduction of heterogeneous atoms.
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高影响因子
危险品化学品经营许可证（带存储）