JOURNAL OF ALLOYS AND COMPOUNDS
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2021
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IF 5.316
Xinran Ji,Tengqian Chen,Chang Shen,Ye Zhao,Ke Zhou,Meiling Sun,Yinghua Yu,Lining Fan,Hui Zheng,Qiong Wu,Qiangyuan Zhang,Yang Zhang
Nickel-copper-zinc (NiCuZn) ferrites with high permeability and low magnetic loss have high application potential in high-frequency electronics. In this work, NiCuZn ferrite samples with different Cu contents were prepared by a two-step sintering method. First, the optimal temperatures of the two-step sintering method (1025/925 °C) were confirmed, thereafter the influence of the Cu content on the crystal structure, microstructure, magnetic and dielectric properties of NiCuZn ferrite were studied in detail. Structural characterization showed that an increase in Cu content promoted grain growth and resulted in NiCuZn ferrites with a denser microstructure and decreased porosity. However, a second phase of CuO formed once the content of Cu (x value) reached 0.16. The magnetic hysteresis loops revealed that the saturation magnetization increased as x increased and the highest value of 57.3 emu/g was obtained at x = 0.14. The dielectric property measurement showed that increasing the Cu content could improve the dielectric constant and reduce the dielectric loss. The permeability measurements showed an increase in permeability with Cu content from x = 0.10 to x = 0.14 and a decrease when x = 0.16. Consequently, a NiCuZn ferrite with an appropriate microstructure and with high permeability (μ'=855), low magnetic loss (tanδ μ = 0.02), and high saturation magnetization (57.3 emu/g) could be obtained at a Cu content of x = 0.14 and sintering temperatures of 1025/925 °C in the two-step sintering method. This NiCuZn ferrite provides new guidance for developing RF frequency multilayer inductors.
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CHEMICAL ENGINEERING JOURNAL
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2021
·
IF 13.273
Shuaidong Liu,Hongli Liu,Guofu Zhou,Xianggao Li,Shirong Wang
Cu-based perovskite Nanocrystals (NCs) have a bright future in the field of optoelectronics due to their low toxicity, remarkable optical properties and good environmental stability. However, the industrial application is hindered by complex preparation methods. Herein, a facile one-pot method for synthesizing Cs 3 Cu 2 X 5 NCs is proposed. The target Cu-based perovskite NCs were qualified with preferable optical performance, including near-unity PLQY (X = Cl and I), adjustable spectrum from 441 to 556 nm and remarkable environmental stability (retained more than 50% Photoluminescence (PL) intensity for 2 months in air). Density functional theory (DFT) calculations, Time-resolved PL (TRPL) and temperature-dependent PL spectrum were implemented to explore the Self-trapped excitons (STEs) luminescence mechanism and the roots for remarkable optical performance. In addition, crystal phase transformation was observed in water post-treatment from blue light-emitting Cs 3 Cu 2 I 5 NCs to yellow light-emitting CsCu 2 I 3 NCs, relative characterizations were implemented and a plausible reaction mechanism was proposed. Resultantly, a White light-emitting diode (W-LED) constructed by mixing these two phases was endowed with pure white light, which possessed the Commission Internationale de L'Eclairage (CIE) coordinate of (0.32, 0.34), color temperature of 6053 K, color Rendering index (Ra) 0f 91 and maximum luminance of 1558 cd/m 2 . The contribution indicates that Cu-based perovskite NCs prepared by one-pot method have great potential for luminescent applications.
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ACS Omega
·
2021
·
IF 3.512
Huayong Luo,Yu Liu,Hanxing Lu,Qian Fang,Hongwei Rong
This work dealt with a potential and effective method to reuse modified alginate beads after the removal of Cu(II) ions for efficient adsorption of tetracycline (TC) from aqueous solutions. The modified alginate beads were fabricated by a polyacrylamide (PAM) network interpenetrated in alginate–Ca2+ network (PAM/CA) decorated with polyethylene glycol as a pore-forming agent. The porous PAM/CA was characterized using scanning electron microscopy, Brunauer–Emmett–Teller, Fourier transform infrared spectroscopy, and X-ray photoelectron spectroscopy analysis. The adsorption kinetics, isotherms, adsorption stability, and reusability studies of the adsorbent toward Cu(II) ions were scrutinized. The column performance of porous PAM/CA was tested with Cu(II)-containing electroplating wastewater. After Cu(II) adsorption, the Cu(II)-adsorbed PAM/CA (PAM/CA@Cu) was applied to remove TC from aqueous solutions without any regeneration process. The effects of pH, initial TC concentration, ionic strength, and coexisting ions on the adsorption were also discussed in detail. Compared with many reported adsorbents, the PAM/CA@Cu exhibited an excellent adsorption performance toward TC with a maximum adsorption capacity of 356.57 mg/g predicted by the Langmuir model at pH 5.0 and 30 °C with the absence of coexisting ions. The possible adsorption mechanism of TC onto the PAM/CA@Cu was revealed.
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PubMed
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2021
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IF 3.764
Ziyi Xiao,Junsheng Zhou,Lu Fan,Yu Li,Yuting He,Yingxi Wang,Ling Li
A composite paper was designed in order to remove dyes and heavy metal ions in wastewater, which was prepared by assembling NH2-Cu-BDC layer by layer on the surface of the carboxymethyl-modified filter paper (CMFP). The prepared composite paper (Cu-MOFs/CMFP) shows the ability to capture dyes and metal ions, and the dye and metal solution can be separated by simple filtration on the MOF paper at the same time. The application of 30-layer Cu-MOFs/CMFP in the removal of pollutants in simulated wastewater was discussed, and it was found that Cu-MOFs/CMFP can simultaneously remove dyes and heavy metal ions with removal rates close to 90%. In addition, Cu-MOFs/CMFP can be reused after a simple washing process and maintains prosperous dye capture ability. The successful development of this technique provides a new strategy to design new materials for the removal of organic dyes and heavy metal ions in wastewater.
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SCIENCE OF THE TOTAL ENVIRONMENT
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2021
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IF 7.963
Liuyang He,Lixin Lv,Suresh C. Pillai,Hailong Wang,Jianming Xue,Yongfei Ma,Yanli Liu,Yulin Chen,Li Wu,Zulin Zhang,Lie Yang
Iron/copper bimetallic nanoparticles based sludge biochar (Fe/Cu-SBC) was prepared by using a modified co-precipitation route. The Fe/Cu-SBC system prepared was subsequently applied to activate periodate (IO 4 − ) to degrade diclofenac sodium (DCF) by using UV light at room temperature (25 °C). The physicochemical properties of both SBC and Fe/Cu-SBC such as morphology, physical properties, crystal structures and functional groups were examined. The type and number of surface functional groups were found to be increased and the catalytic performance was improved by the modification of Fe/Cu bimetallic nanoparticles. The influence of various parameters to evaluate the catalytic efficiency such as periodate (PI) concentration, dosage of catalysts, UV power, initial pH and coexisting anions were investigated. Under the optimized conditions (pH 6.9, UV-power 60 W, PI concentration of 5 mM and 0.1 g Fe/Cu-SBC), it was observed that 99.7% of DCF was degraded with a pseudo-first-order kinetics reaction constant 9.39 × 10 −2 min −1 . The radical scavenging experiments showed that IO 3 radicals were the predominantly reactive oxidants in the Fe/Cu-SBC/UV system. Therefore, this investigation provides a feasible alternative for the degradation of PPCPs in wastewater.
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PubMed
高影响因子
Materials Chemistry Frontiers
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2021
·Vol. 5
·期 14
·5361-5370
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IF 6.482
Honghong Gong,Yipin Cheng,Ying Zhang,Jie Xiong,Zhicheng Zhang
The detection of copper ions is rather important since they have undesired hazardous effects on the ecosystem and human health. Many methods have been developed for copper ion detection in the aqueous phase among which the direct detection of copper ions in the organic phase has been rarely reported. To overcome the disadvantage of the complicated sample pre-treatment involving the detection of copper ions in the organic phase, herein, we report a type of poly(vinylidene fluoride) based fluoropolymer (P(VDF–ATrFE)) as a novel fluorescence sensor for copper ion detection. A poly(vinylidene fluoride) based fluoropolymer (P(VDF–ATrFE)) can selectively bind to Cu2+ in the presence of an organic ligand, which is utilized to directly demonstrate the sensitive detection of Cu2+ in the organic phase. A rapid time response, excellent selectivity and highly efficient quantitative analysis of Cu2+ in the organic phase are obtained using P(VDF–ATrFE) as a fluorescent probe. This work provides a fast and convenient visual fluorescence detection method of Cu2+ in the organic phase.
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RSC Advances
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2021
·Vol. 11
·期 31
·18994-18999
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IF 3.361
Linzhi Li,Tianzeng Huang,Saijun He,Xing Liu,Qi Chen,Jian Chen,Hongmei Cao
A fast and sensitive test of blood glucose levels is very important for monitoring and reducing diabetic complications. Herein, a simple and sensitive non-enzymatic glucose sensing platform was fabricated by employing Cu2+–Cu+/biochar as the catalyst. The Cu2+–Cu+/biochar was synthesized through a bio-inspired synthesis, in which waste eggshell membrane (ESM) was introduced as a template to absorb Cu2+, then converting it into Cu2+–Cu+ biochar via a rapid pyrolysis. The structure and properties of the as-prepared Cu2+–Cu+ biochar were determined by scanning electron microscopy (SEM), FT-IR spectroscopy, Raman spectroscopy and cyclic voltammetry (CV). Due to great advantages of Cu2+–Cu+/biochar, such as high electrical conductivity, unique three-dimensional porous network and large electrochemically active surface area, the as-prepared Cu2+–Cu+ biochar modified electrode showed high catalytic activity towards glucose oxidization. The fabricated enzyme-free glucose sensor showed excellent performance for glucose determination with a linear range of 12.5–670 μM, and a limit of detection (LOD) of 1.04 μM. Moreover, the as-fabricated sensor has good anti-interference ability and stability. Finally, the proposed senor has been successfully applied to detect glucose in clinical samples (human serum). Owing to the green synthesis method, using biowaste ESM as a template, and the superior catalytic performance and low cost of Cu2+–Cu+/biochar, the developed sensor shows great potential in clinical applications for direct sensing of glucose.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2021
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IF 8.128
Jinxin Wei,Zhe Hu,Wenjie Zhou,Yi Qiu,Hanqing Dai,Yuanyuan Chen,Zhongjie Cui,Siyu Liu,Haiyang He,Wanlu Zhang,Fengxian Xie,Ruiqian Guo
With the blooming development of zero-dimensional nanomaterials , I-III-VI alloying quantum dots (QDs) with outstanding photoelectrical properties have emerged to attract much attention as promising environmentally-friendly substitutions for conventional binary Cd-based QDs. In this work, a facile one-pot method was introduced to synthesize unreported quaternary Ag-Cu-Ga-Se/ZnSe (ACGSe/ZnSe) QDs. A relatively high photoluminescence quantum yield (PL QY) of 71.9% and a tunable emission from 510 to 620 nm were successfully achieved. We explored the roles of alloying compositions in ACGSe/ZnSe QDs, inferring that increased Ag proportion would not only lower the V defect level which leads to the blue shift of emission, but also slow the ZnSe shelling process owing to the larger lattice distortion. At last, the white light-emitting diodes (WLEDs) were fabricated with ACGSe/ZnSe QDs as the conversion layer, indicating that the as-prepared QDs are a promising candidate for further applications.
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JOURNAL OF THE ENERGY INSTITUTE
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2021
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IF 6.186
Yunwu Zheng,Jida Wang,Donghua Li,Can Liu,Yi Lu,Xu Lin,Zhifeng Zheng
To improve the quality of bio-oil and minimize coke formation, ex-situ catalytic biomass pyrolysis vapor upgrading to high-grade bio-aromatic and phenol compounds with Py-GC × GC/MS at different nickel-to-copper ratios was investigated. At the same time, the deoxygenation efficiency, structure-activity relationship, deactivation mechanism and possible pathways between combined mono- and bimetallic catalysts were also demonstrated. Ni and Cu species could be well dispersed, and the HZSM-5 support maintained the MFI crystal structure after bimetallic Ni–Cu modification, but the surface area, pore volume, and total acidity decreased. Bimetallic Ni–Cu catalysts showed better deoxygenation efficiency than monometallic catalysts, which had more advantages in the preparation of aliphatic hydrocarbons (29.86%) than mono- and bimetallic catalysts, which favored the production of aromatics (28.89%). Higher-Ni-loading catalysts promoted the formation of aliphatic hydrocarbons, aromatics and alkanes due to decarboxylation, decarbonylation and aromatization reactions, and higher-Cu-loading catalysts enhanced the olefin and phenol yields due to dehydration and demethylation reactions. Overall, the highest yields of bio-aromatic compounds and phenols were46.78% and 36.34%, respectively, at Ni-to-Cu ratios of 1:1 and 1:2, due to the high total acid amount and suitable average pore size for bio-aromatics and the low acidity and large pore size for phenols. The bimetallic Ni–Cu catalyst significantly increased the quality of bio-oil and reduced coke deposition.
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JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
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2021
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IF 5.302
Xiangzhao Zhang,Puhao Xu,Xinyue Wu,Xinyi Gui,Guiwu Liu,Mingfen Zhang,Haining Meng,Guanjun Qiao
The wetting of ZrB 2 ceramic by molten pure Cu, Cu-(20, 30, 40, 50 at.%)Ti alloys were performed by the sessile drop method under vacuum of ∼4 × 10 −4 Pa in the 1030−1070 °C temperature range. The wetting and interfacial behaviors of Cu-Ti/ZrB 2 systems were analyzed and discussed. Furthermore, the work of adhesion and electronic properties of the Cu(1 1 1)/ZrB 2 (0 0 0 1) and Ti(0 0 0 1)/ZrB 2 (0 0 0 1) atomic interfaces were quantitatively evaluated by first-principles method. The wettability is significantly improved with the Ti concentration or wetting temperature increasing as a result of the formation of (Ti) solid solution at interface. The calculated results show that the B-terminated ZrB 2 (0 0 0 1) surface is preferable to bond with Ti(0 0 0 1) surface, and the electronic structure reveals that the dominant interfacial bonding is the Ti-B ionic bond for the Ti/B-terminated ZrB 2 interface.
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CHEMISTRY OF MATERIALS
·
2021
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IF 9.811
Jinglong Huang,Binbin Su,Enhai Song,Maxim S. Molokeev,Zhiguo Xia
Low-dimensional hybrid metal halides demonstrate broad-band emission and high photoluminescence quantum yield (PLQY) acting as excellent candidates for a new generation of luminescent materials in lighting fields. However, most luminescent metal halides can only be excited by ultraviolet radiation, and the discovery of high-efficient emitters with broad-band excitation characteristics, especially upon efficient blue light irradiation, is a challenge. Herein, a zero-dimensional (0D) Cu(I)-based organometallic halide (18-crown-6)2Na2(H2O)3Cu4I6 (CNCI) was prepared with a green emission band centered at 536 nm and a near-unity PLQY (91.8%) upon excitation of 450 nm. Importantly, the ultrabroad excitation band covering a 300–500 nm range was observed in CNCI, and the luminescence mechanism has been discussed in detail. A white light-emitting diode (WLED) was fabricated with high luminous efficiency of 156 lm/W and a high color rendering index of 89.6. This work provides guidance for designing high-performance luminescent metal halides with suitable excitation characteristics and also promotes the application prospects of such materials in WLED fields.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Xiao-Lu Sun,Zan Liu,Zhi-Lin Cheng
The Cu-intercalated layered h-BN/N-doped carbon-nanofiber composite films (PAN-Cu/ABN-CNFs) were successfully prepared by the combination of the electrospinning technique and the one-pot carbonization process, using the mixed solution of polyacrylonitrile (PAN) and Cu-intercalated activated boron nitride (Cu/ABN) as carbon precursor. A series of characterizations proved that the PAN-Cu/ABN-CNFs possessed the distinguished merits in the structure and composition, such as the pore feature of the micropore (0.076 cm 3 /g)-mesoporous (0.3582 cm 3 /g) structure, the structure of the exfoliated h-BN nanosheets , the low-coordination high-content N (11.65 at%) and the existence of self-reducing Cu nanoparticles (0.5 at%). For adapting the actual application, the mechanical properties of the PAN-Cu/ABN-CNFs were comprehensively evaluated, showing that the PAN-Cu/ABN-CNFs films had the robust tensile strength and bending properties as well as the desirable wear resistance. Furthermore, the selective adsorption desulphurization of the PAN-Cu/ABN-CNFs were examined by the selective adsorption removal of thiophene (TH) from the simulated oil, indicating that the optimum adsorption capacity of the fresh films was up to 78.38 mg/g in 800 mg/L initial concentration and the adsorption capacity after the four-time regeneration recycling still approached 74.894 mg/g. Finally, the adsorption kinetics , isotherm and thermodynamic studies suggested that the adsorption behavior of TH over the PAN-Cu/ABN-CNFs should be better described by the correlation coefficients of Avrami fractional-order kinetics and Liu isotherm, while the thermodynamic studies showed a favorable exothermic and spontaneous adsorption mechanism.
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