Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Xin Liu,Peng Xu,Zhuoyu Yang,Pengfei Zhu,Jingwei Ma,Qiulai He,Baolin Hou
Zero-valent copper (Cu(0))-triggered hydrogen peroxide (Cu(0)/H 2 O 2 ) process was used to eliminate and mineralize contamination, while its oxidation efficacy was limited by the reaction of Cu(I) with O 2 . In this study, ferric ion (Fe(III)) was spiked into the Cu(0)/H 2 O 2 (Fe(III)/Cu(0)/H 2 O 2 ) system, and the degradation rate of paracetamol decreased from 24.9% to 95.4%. In the Fe(III)/Cu(0)/H 2 O 2 system, the reaction of Cu(0) and Cu(I) with Fe(III) expedited the conversion from Fe(III) to Fe(II). The reaction of Cu(I) with O 2 was weakened by the competition reaction between Cu(I) and Fe(III), promoting the generation of reactive oxygen species and increasing the utilization of Cu(0). The main reactive oxygen species for pH 4.0 was •OH and Fe(IV) with the contribution rate of •OH and Fe(IV) being 92.3% and 7.7%, but the dominant reactive oxygen species at pH 3.0 was only •OH in the Fe(III)/Cu(0)/H 2 O 2 process. Especially, the contribution of Fe(IV) rose and the contribution of •OH decreased, when the concentrations of 20–80 μmol/L Fe(III), 0.05–0.3 g/L Cu(0) and 50–300 μmol/L H 2 O 2 incremented. In the Fe(III)/Cu(0)/H 2 O 2 process.After we increased the pH of end solution to 7.0/7.5/8.0 and leaching, the total copper in reaction solution was under 6.4/3.3/1.5 μmol/L. In addition, Ni(II) (57.7%), Fe(II) (100%) and Mn(II) (72.4%) obviously enhanced the degradation of paracetamol in the Cu(0)/H 2 O 2 process.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2023
·Vol. 34
·期 24
·1-19
·
IF 2.8
Chen Haixue,Wang Xinyue,Zeng Zejun,Zhang Guoqi,Zhang Jing,Liu Pan
With the development of electronic technology towards high power, miniaturization, and system integration, power electronic packaging is facing increasing challenges, especially for die attachment. This research aims to explore silver-coated copper (Cu@Ag) paste with sufficient mechanical properties and high-temperature reliability, as an alternative solution for silver sintering with lower cost. Firstly, micro-Cu@Ag sintering pastes were investigated under four kinds of polyol-based solvent systems and two types of particle morphologies, which included sphere-type (SCu@Ag) and flake-type (FCu@Ag). Sintering performance and microstructural evolution were compared and analyzed. Notably, sintered joints employing the terpineol–polyethylene glycol solvent system and flake-type morphology displayed a denser microstructure in comparison to SCu@Ag joints. Its bonding strength reached 36.15 MPa, which was approximately 20% higher than SCu@Ag joints. Subsequently, the influence of key sintering process parameters on Cu@Ag joints was analyzed, including sintering temperature, pressure and time. Additionally, high-temperature aging and thermal cycling tests were conducted on the optimized Cu@Ag joints to assess their reliability. Finally, the micromechanical properties of Cu@Ag joints before and after high-temperature aging were further evaluated by nanoindentation including creep properties. The elastoplastic constitutive models of Cu@Ag sintered materials with different particle morphologies were constructed, providing valuable insights for reliability evaluation. The results indicated that FCu@Ag joints exhibited satisfactory creep resistance and high-temperature reliability. In conclusion, the FCu@Ag micro-paste based on the terpineol–polyethylene glycol solvent system proposed in this study demonstrated sufficient bonding strength, high reliability, and adequate mechanical properties as an attractive solution for high-temperature power electronics packaging.
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FUEL
·
2023
·
IF 7.4
Chengda Li,Yueli Wen,Bin Wang,Maohong Fan,Wenlong Liu,Zheng Cui,Wei Huang
Activation and desorption of the hydrogen atom in the toluene methyl is a restrictive step for side-chain alkylation of toluene with methanol (SATM). In this work, two dehydrogenation strategies were used to improve the catalytic performance, dehydrogenation component Cu was introduced in PAl-NaX catalyst as well as the acid-base property was adjusted by changing NaOH loading amount. The relationship among the percentage of acid-base sites, low valence Cu species and the catalytic performances was investigated combined with the multiple characterizations, like X-ray photoelectron spectroscopy (XPS), Temperature-programmed desorption (TPD) of NH 3 and CO 2 , etc. together with ternary regression analysis. It is found that the dehydrogenation component Cu, especially low valence Cu species, promotes the selectivity of side-chain alkylation products to a certain degree, but base sites play an even more critical role in enhancing it.
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Chemosensors
·
2023
·Vol. 11
·期 8
·431
·
IF 4.2
Yushuang Guo,Mingli Chen,Ting Yang,Jianhua Wang
As the most abundant catecholamine neurotransmitter in the brain, dopamine plays an important role in the normal physiological process, and its level in urine also changes during human pathological processes. In clinic, the detection of dopamine in urine is a potential marker for the diagnosis and the treatment of endocrine-related diseases. In this work, a copper metal organic framework with catecholase-like activity was prepared via the precipitation of Cu2+and imidazole, simulating the N-Cu coordination environment in the active site of catecholase. Cu-MOF (the copper–metal organic framework) can catalyze the oxidation of DA (dopamine) to dopaquinone using O2in the air. The oxidation product can further react with 1,3-dihydroxynaphthalene to produce a fluorophore product. Based on the above reaction, a multimodal sensing platform with three signal outputs, including ratio-metric fluorescence, absorbance and digital information extracted from smartphone images for simple and sensitive determination of DA, was proposed, with detection limits of 0.0679, 0.3206, and 0.3718 μM, respectively. This multimodal sensing platform was able to detect DA in body fluid in a self-correcting way, as demonstrated by the successful determination of DA in normal human urine samples, and samples with a high level of interference.
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Nano Research
·
2023
·Vol. 16
·期 10
·12270-12280
·
IF 9.9
Jiang Fengyang,Lan Tian,Sun Jiaqiang,Zhao Guofeng,Lu Yong
The gas-phase dehydrogenation of 1,6-hexanediol (1,6-HDO) to ε-caprolactone (ε-CL) over the high-performance Cu-based catalysts is highly desirable, but with grand challenges, because the Cu nanoparticles (NPs) are easy to be sintered with the low Hüttig temperature (< 150 °C vs. > 250 °C of reaction temperature). Herein, we report a highly efficient silica-encapsulated nano-Cu catalyst (Cu@SiO 2 /SiO 2 ) prepared via a complexation-impregnation method for the dehydrogenation of 1,6-HDO, exhibiting a 1,6-HDO conversion of 95.3% and ε-CL selectivity of 80.0% at 270 °C. The catalyst also has the outstanding thermal stability (without sintering up to 270 °C for 100 h on stream), which can be attributed to the effective encapsulation of the SiO 2 shell. In addition, the reaction network of 1,6-HDO dehydrogenation is proved. Finally, the pyridine-diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) and in-situ X-ray photoelectron spectroscopy (XPS) reveal that the Cu 0 species favor the conversion of 1,6-HDO to ε-CL. The synergistic effect of Cu + and Cu 0 benefits the conversion of ε-CL to 2-methylcyclopentanone (2-MCPN). This study is beneficial for designing the high-performance Cu-based catalysts for 1,6-HDO to ε-CL, understanding the reaction network of 1,6-HDO dehydrogenation over the Cu-based catalysts, and offering a strong foundation for the large-scale production of ε-CL.
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CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Ping Zhang,Mingxue Xiang,Wei Jiang,Huiling Liu,Yu Chen,Ying Fang,Longyong Wu,Hongjun Guo,Yufei Wang
Integrated adsorption and photocatalysis is a worth frontier strategy for recalcitrant organics elimination, yet the current challenge is developing materials featured with dual functions of adsorption/photocatalytic ability. In this scenario, a novel attractive exfoliated vermiculite coupling with Cu(II) composite (eVT@Cu) was tactfully engineered. Specifically, exfoliated structure containing vast negative charge was conductive for Cu(II) loading. The anchored Cu(II) played triple roles in this system, that is, regulating electron configuration of photocatalyst with narrow bandgap, as well as providing complexation sites for tetracycline (TC) enrichment. With the help of inherent Fe(III), Cu(II) was readily to form heterogeneous high-valence Cu(III) driven by photonic energy. Benefited by these effects, eVT@Cu exhibited extremely augment on TC removal compared to pristine VT and eVT, with ca. 80% removal efficiency through the synergy of adsorption and photocatalysis. Overall, this study not only provides an excellent environmental candidate for TC removal but also opens a brand-new perspective for the generation of heterogeneous high-valence Cu(III) over eVT@Cu under visible light.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2022
·
IF 4.831
Xiaozong Dou,Zhenhong Jia,Hongyan Zhang,Chu Chen,Ling Zhang,Jianping Man,Weiyuan Gu
A high-performance fluorescent probe 2,5-dimercapto-1,3,4-thiadiazole copper nanoparticles (DMTD-CuNPs) was synthesized by hydrothermal method based on monovalent copper (Cu(I)) and 2,5-dimercapto-1,3,4-thiadiazole (DMTD), and it can effectively detect cysteine (Cys) in plasma. Experiments show that DMTD can reduces band gap of Cu(I) in DMTD-CuNPs, promote charge transfer transition from DMTD to Cu(I) and significantly enhance fluorescence intensity of DMTD-CuNPs at 515 nm. The large Stokes shift of DMTD-CuNPs is 315 nm, which can reduce the self-quenching of probe fluorescence and improves detection accuracy of the probe. In the presence of Cys, fluorescence of DMTD-CuNPs at 515 nm is significantly quenched because Cys reacts with Cu(I) in DMTD-CuNPs through Cu-S bond to form reduced charge transfer, which can be successfully used for the detection of Cys. Linear range and detection limit for Cys detection are 25–65 µM and 50 nM, respectively. Furthermore, feasibility of detecting Cys in plasma using DMTD-CuNPs probe was evaluated by standard addition method, and the absolute recovery is 96–99%. Such a DMTD-CuNPs probe shows high sensitivity, good selectivity and low detection limit for Cys, which is expected to be used for the practical analysis of Cys in plasma.
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PubMed
高影响因子
MOLECULES
·
2022
·Vol. 27
·期 20
·6951
·
IF 4.927
Yujie Tao,Fang Zhou,Kaixin Wang,Dequan Yang,Edward Sacher
Although a facile route to prepare AgCu nanoalloys (NAs) with enhanced antibacterial efficacy using Ag NP catalysis of Cu ions at elevated temperatures was previously developed, its detailed reaction process is still unclear due to the fast reaction process at higher temperatures. This work found that AgCu NAs can also be synthesized by the same process but at room temperature. AgCu NAs formation kinetics have been studied using UV–Visible spectra and Transmission Electron Microscopy (TEM), where formation includes Cu2+deposition onto the Ag NP surface and Ag+release, reduction, and agglomeration to form new Ag NPs; this is followed by a redistribution of the NA components and coalescence to form larger AgCu NPs. It is found that SPR absorption is linear with time early in the reaction, as expected for both pseudo-first-order (PFO) and pseudo-second-order (PSO) kinetics; neither model is followed subsequently due to contributions from newly formed Ag NPs and AgCu NAs. The antibacterial efficacy of the AgCu NAs thus formed was estimated, with a continuous increase over the whole alloying process, demonstrating the correlation of antibacterial efficacy with the extent of AgCu NA formation and Ag+release.Keywords:Ag nanoparticles;AgCu nanoalloys;antibacterial efficacies;reaction kinetics
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Bioactive Materials
·
2022
·
IF 16.874
Shuaijie Li,Liyan Zhang,Chunyu Liu,Jua Kim,Kun Su,Tingli Chen,Limin Zhao,Xiaomei Lu,Hao Zhang,Yinglin Cui,Xu Cui,Feng Yuan,Haobo Pan
Injectable bone biomaterials like bone cement should be designed and fabricated with certain biological criteria, which include: 1) recruitment and polarization of the macrophages from M1 (pro-inflammatory) to M2 (anti-inflammatory) phenotype, 2) enhance vascularization, and 3) activate osteogenic differentiation of bone marrow-derived stem cells to promote bone healing. So far, no injectable biomaterials could spontaneously regulate the entire bone healing process that involves inflammation, angiogenesis, and osteogenesis. Therefore, in this study, we designed bone cement comprised of strontium and copper-incorporated borosilicate glass (Sr/Cu-BSG) in the liquid phase of chitosan to modulate bone healing. In vitro studies showed that the controlled release of Sr and Cu ions up-regulated anti-inflammatory genes(IL-1Ra and TGF-β1) while down-regulating pro-inflammatory genes(IL-1β and IL-6) in macrophages at 3 days. Sr and Cu ions also increased the expressions of angiogenic genes (VEGF and bFGF) in HUVECs at 5 days and osteogenic genes (Runx-2, OCN, and OPN) in hBMSCs at 7, 14, and 21 days. 5Sr3Cu-BSG bone cement exhibited the best anti-inflammatory, angiogenic, and osteogenic properties among the bone cement groups with different Sr and Cu ratios. Short-term and long-term implantation of Sr/Cu-BSGs in femoral condylar bone defects of rats and rabbits confirmed the in vitro results, where the degradation rate of Sr/Cu-BSG matched the bone healing rate. Similar to in vitro , the 5Sr3Cu-BSG group also showed the highest bone formation in vivo. Excellent physical and chemical properties, along with its bone repairing ability, make the Sr/Cu-BSG bone cement a good candidate biomaterial for treating bone defects.
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Energy Storage Materials
·
2022
·
IF 20.831
Chang Liu,Cheng Yang,Yu Liu
Sulfur with high specific capacity is a promising candidate for electrode material of aqueous/nonaqueous metal-sulfide batteries , however, it suffers from poor cycle stability due to its poor conductivity, large volume change and shuttle effect of polysulfide . For the first time, this work employs a semiconductor Ag 2 S with good electronic conductivity as cathode of aqueous metal-sulfide batteries, which gives a four-electron electrode reaction through a three-step all-solid-state conversion reaction of Ag 2 S→Ag 3 CuS 2 →AgCuS→Cu 2 S with a specific capacity of 432 mAh g −1 . Besides, low volume expansion and the elimination of shuttle effect due to the small K sp of Ag 2 S contribute to satisfactory cycle performance. The as-proposed Cu-Ag 2 S battery shows an extremely low overpotential of 50 mV and excellent cycle performance of 9000 cycles, which are the lowest and highest values respectively among all the reported metal-sulfide batteries. By pairing with Zn of lower potential, a cascade Zn-Ag 2 S battery is designed and achieves high working voltage up to1.22 V successfully. After Ag 2 S fully reducing into Cu 2 S in discharge process, Cu 2+ in the electrolyte can provide additional capacity for the battery, thus, the cascade battery design can achieve a higher energy density , representing a promising route to energy-dense aqueous batteries.
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CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Jiayu Feng,Lijuan Jia,Fei Wang,Xin Sun,Ping Ning,Chi Wang,Yuan Li,Kai Li
In this work, we report a novel urea-modified copper-based material (XUrea@Cu) obtained by directly calcinating a mixture of urea and copper nitrate. This material enables the efficient purification of H 2 S under dry and anaerobic conditions. The performance test results showed that the H 2 S capacity of the optimal adsorbent (2Urea@Cu) could reach 364.2 mg(H 2 S)∙g sorbent -1 , which is much superior to those of other adsorbents in the literature. Further study demonstrates that the ultra-desulfurization performance of 2Urea@Cu is mainly attributed to the extensive alkaline site, the high concentrations of active oxygen, and the abundance of oxygen vacancy; which are quite effective for capturing H 2 S (acidic and strong reducibility). Interestingly, the deactivation adsorbent (De-2Urea@Cu) is mainly composed of high-purity CuS, which means that the Urea@Cu adsorbent can simultaneously achieve efficient purification of H 2 S and recovery of sulfur resources since CuS is a valuable product. In addition, in-situ FT-IR and theoretical calculation results indicate that H 2 S molecules dissociate on the CuO(1 1 1) surface by stepwise dehydrogenation, while S combines with adjacent Cu to form CuS. The consumption of active components (CuO) and the accumulation of reaction products (CuS) are the primary reasons for the deactivation of adsorbents. Considering the simple preparation process, low cost, and excellent H 2 S adsorption activity, these urea-modified copper-based materials are very promising H 2 S adsorbents.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Weihua Qin,Mingye Ren,Yuwei Lu,Shaoxia Yang
The two-stage fixed-bed reactor significantly enhanced the phenol degradation efficiency in the heterogeneous Fenton-like reaction. The Cu/Bi-Ce/Al 2 O 3 catalyst, prepared by impregnation-precipitation method, exhibited favorable phenol removal, and the phenol degradation efficiency was ∼32.6 % higher in the two-stage fixed-bed reactor than that in the one-stage fixed-bed reactor under optimal parameters. Moreover, the Cu/Bi-Ce/Al 2 O 3 catalyst had excellent stability in the Fenton-like reaction due to the bismuth doping in the catalyst inhibiting the dissolution of copper ion. The Cu/Bi-Ce/Al 2 O 3 catalyst also displayed efficient purification ability for phenolic municipal sewage in the two-stage fixed-bed reactor. The redox cycles of Cu 2+ /Cu + and Ce 4+ /Ce 3+ were evidenced coexist to enhance the catalyst activity. The quenching experiments demonstrated that the generated singlet oxygen and superoxide anion free radicals dominated the degradation of phenol in the heterogeneous Fenton-like reaction over the Cu/Bi-Ce/Al 2 O 3 catalyst. This study may provide a novel heterogeneous Fenton-like/H 2 O 2 system for degrading organic pollutants in the fixed-bed reactor.
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