PLASMA SOURCES SCIENCE & TECHNOLOGY
·
2023
·Vol. 32
·期 4
·045010
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IF 3.8
Xu Tian,Dongyuan Wang,Bo Ouyang,Qiang Chen,Zhongwei Liu,Xinwei Wang
A novel plasma-assisted fluidized-bed atomic layer deposition process to synthesize Pd-Cu bimetallic nanoparticles is reported, using palladium hexafluoroacetylacetonate, copper(I)-N, N'-di-iso-propylacetamidinate and H2 plasma. The process allows us to uniformly deposit Pd-Cu nanoparticles in porous powder, which is a mixture of γ-Al2O3 (30 wt%), amorphous aluminum silicate (50 wt%) and molecular sieve (20 wt%) (ASM). With metal loadings of 13.1 and 2.5 mg g−1 for Pd and Cu, respectively, the afforded 13.1Pd-2.5Cu catalyst shows excellent catalytic performance for the hydrogenation of CO2 in a dielectric barrier discharge reactor with no intentional heating. Under the condition of discharge input power of 24.6 W, H2-to-CO2 ratio of 4 in feed gas, and gas hourly space velocity of 7595 h−1, the conversion of CO2 can reach as high as 38.0%, with the CH4 and CH3OH product selectivities of 6.7% and 12.8%, respectively. Density functional theory calculations are further employed to understand the associated CH3OH formation mechanism.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2023
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IF 6.2
Pengtao Sheng,Youyang Xie,Shuyu Han,Yanling Li,Weili Li
Manganese ion-doped quantum dots (QDs) with wide band gaps have been widely investigated to modify their electronic, magnetic, and photophysical properties. The research on Mn-doped Cu-In-Se QDs with narrow band gaps has been minimal due to the profound differences in the reaction reactivity of cations. In this work, photoluminescent and magnetic Cu-In-Se QD nanoprobes were designed and synthesized by introducing Zn 2+ ions, which function as an intermediate acid that can regulate metal ion acidity to enhance the doping efficiency of Mn 2+ ions in a facile phosphine-free hot-injection protocol. The emission peaks of Zn-doped Cu-In-Se QDs and MnZn-doped Cu-In-Se QDs exhibit significant composition-dependent shifts. Moreover, incorporating manganese ions confers a paramagnetic character to MnZn-doped Cu-In-Se QDs and provides a quasi-core shell structure with an Mn-rich alloy shell layer, as demonstrated by the micro-structural surface analysis and electron paramagnetic resonance spectroscopy . Analyzing the decay lifetime and quantum yield reveals that this host-dopant coupling involves a preferential energy transfer from the host material to the dopant (Mn 2+ ions), wherein photogenerated electrons nonradiatively transfer to the 4 T 1 level of Mn dopant and then recombine with the Cu x state above the valance band of host QDs. The ability to serve as nanoprobes for the visualization of tumors through fluorescence and magnetic resonance dual-modality imaging makes these ternary MnZn-doped Cu-In-Se QDs strong candidates for practical applications in biology/biomedicine field.
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VACUUM
·
2023
·
IF 4
Jian Zhang,Chang Xu,Jing Li,Huanjun Lu,Shaohui Zhang,Chao Wang
In this paper, the Cu-/Ni-based one-dimensional (1D) conductive metal-organic frameworks (c-MOFs) nanorods (Cu 3 (HHTP) 2 /Ni 3 (HHTP) 2 ) have been synthesized successfully through a one-pot hydrothermal method . The effect of reaction time, MOFs compositions and ratio of solvent on the performance of Cu 3 (HHTP) 2 -/Ni 3 (HHTP) 2 - based resistive temperature sensors was studied by sensing platforms. Compared with Ni 3 (HHTP) 2 -based sensor, Cu 3 (HHTP) 2 -based sensor, which was assembled under DMF volume of 0.5 mL and reaction time of 12 h (Cu7), provided the optimal performance, for example, relative variation of resistance (RVR) near-linearly decreased by 85.9% from 20 °C to 80 °C, and the temperature coefficient of resistance (TCR) reached up −0.0157 °C -1 . Moreover, the resistance value of the Cu 3 (HHTP) 2 -based sensor is 0.106 kΩ, which exhibited a minimum resistance under different temperatures. These results demonstrate that the use of Ni 3 (HHTP) 2 -based 1D c-MOFs for fabrication of temperature sensor provides good conductivity and high thermo-responsive sensitivity. Hence, this study provided an excellent example for the simple preparation and practical application of 1D c-MOFs-based near-linear temperature sensor.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2023
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IF 8.4
Weidan Na,Changjin Ou,Yijun Ming,Yuchong Gao,Lin Tian
Surface enhanced Raman spectroscopy (SERS) detection was not as accurate and reproducible as fluorometry due to some uncertainties such as operator's focus adjustment and difference between capillaries. Herein, the weak Raman signal (1640 cm −1 ) from water bending vibration is adopted as a benchmark to improve the practical applicability of Raman detection. Specifically, amygdalin and citrate sodium were applied as reducing and capping agent to synthesize dual-ligand gold nanoparticles (DL-AuNPs). Additionally, the cyano group of amygdalin can attach to the surface of DL-AuNPs and generate a primary SERS signal (2174 cm −1 ), which can be significantly enhanced by Cu(II) as DL-AuNPs aggregates. More importantly, the strong binding affinity between pyrophosphate ions (PPi) and Cu(II) redisperses DL-AuNPs and decreases the signal intensity, making the DL-AuNPs/Cu(II) SERS sensor promising for the detection of PPi. This proposed method presents a reliable SERS analysis with the stable water background calibration and broaden the application of SERS technique in aqueous solution target monitoring.
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ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
·
2023
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IF 6.8
Yirong Zhang,Zhenchao Tan,Kaikai Qin,Chenglan Liu
Pesticides and heavy metals commonly coexist in soil. In this study, the influence of Cd and Cu on the toxicity of rac -dinotefuran and the enantioselective behavior of dinotefuran enantiomers in soil-earthworm microcosms were investigated. The acute toxic tests showed that S -dinotefuran has higher toxic than that of R -dinotefuran. The rac -dinotefuran and Cd has an antagonistic effect on earthworms, and the Cu and rac -dinotefuran has a synergistic effect. Earthworms maybe promoted the enantioselective behavior of dinotefuran in soil. Co-exposure to Cd or Cu inhibited the dissipation of dinotefuran enantiomers ( S -dinotefuran and R -enantiomers), and slightly reduced the enantioselectivity in soil. The earthworms were found to be preferentially enriched with S -dinotefuran. However, Cd or Cu attenuated the accumulation of dinotefuran enantiomers in earthworms and decreased the enantioselectivity. The effect of Cd and Cu on the environmental behaviors of dinotefuran enantiomers were correlated positively with the dose of Cd/Cu. These results showed that Cd and Cu alter the environmental behaviors and the toxicity of dinotefuran enantiomers in soil-earthworm microcosms. Thus, the influence of coexistent heavy metals on the ecological risk assessment of chiral pesticides should be considered.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2023
·Vol. 30
·期 32
·78988-79000
·
IF 5.8
Dong Jiayu,Song Xianni,Zhang Shuchi,Tan Mengyu,Zhao Haiyan,Wu Donglei
A novel hierarchical Cu/ZSM-5 was prepared over alkaline treatment and incipient wet impregnation method for the catalytic ozonation of polyvinyl alcohol (PVA). Under the optimum preparation conditions, hierarchical Cu/ZSM-5 exhibited an excellent mineralization performance during the PVA degradation process, and the removal rate of TOC after 60 min of reaction was 47.86%, much higher than that of ozonation alone (5.40%). Its high catalytic activity could attribute to the large pore volume (0.27 cm 3 /g) and pore size (6.51 nm) which are beneficial for the distribution of loaded copper and adsorption performance for PVA. Compared to ·OH, 1 O 2 (2.66 times in 10 min) contributed more to the removal of PVA. The degradation of PVA was a combined process of direct ozone oxidation, catalytic ozonation and adsorption. With its high catalytic performance and stability, hierarchical Cu/ZSM-5 has a very broad application prospect in the process of catalytic ozonation of refractory pollutants.
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CATALYSIS LETTERS
·
2023
·
IF 2.8
Fang Yu,Chen Fengtao,Qin Xianan,Zhang Bingying,Mei Xueting,Lu Wangyang,Li Nan
As one of extensively used photocatalysts, zinc oxide nanoparticles (ZnO NPs) can generate free radicals under proper light irradiation, thereby achieving excellent antibacterial performance. However, the requirement of using light activation has limited its application to wider fields. In addition, nano-copper (Cu NPs) have gradually attracted the attention of researchers due to their excellent antibacterial properties. However, the high surface activity of nanoparticles makes them easy to agglomerate, and Cu NPs are easily oxidized, which affect the antibacterial activity. By synthesizing Cu–ZnO composite nanoparticles and loading the particles onto low melting-point polyethylene terephthalate (LMPET) fibers, we have developed a novel catalytic fiber (Cu–ZnO@LMPET) that can generate active species without needing light. It was found that Cu–ZnO@LMPET fibers with the copper content of 5 wt% (vs. ZnO NPs) or above could achieve 99% antibacterial effects on S. aureus and E. coli under dark conditions. Moreover, the antibacterial rates against E. coli and S. aureus could still be larger than 97 and 98%, respectively, even if the fibers were washed 50 times. In-vitro biocompatibility assessment also displayed that the as-prepared fibers had superb cytocompatibility. These results indicate that our developed fibers have highly efficient antibacterial properties, good washing resistance and high stability. Thus, our work has shed new light on the use of Cu–ZnO NPs for antibacterial purposes.
Graphical Abstract
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Lu Yang,Zhao Wang,HaiJiang Gong,Shili Gai,RuiFang Shen
Chemodynamic therapy (CDT), an emerging oncology treatment, has received considerable attention owing to its high selectivity, less aggressiveness, and endogenous stimulation. However, the complex intra-tumor environment limits the therapeutic effect. In this study, Cu + was directly doped into the structure of the UiO-66 matrix using an in situ one-pot oil bath method. The as-formed UiO-66/Cu possessed a large surface area, making it feasible to modify folic acid (FA) and carry more chemotherapeutic agents like tirapazamine (TPZ), thus forming UiO-66/Cu-FA-TPZ nanoplatforms. For CDT, the nanoplatform catalyzed the cyclic generation of the highly oxidizing hydroxyl radical (·OH) from H 2 O 2 . Particularly, low-frequency ultrasound enhanced the curative effect. Notably, in a tumor, a severe hypoxic environment and ultrasound can activate more TPZ for safe and efficient chemotherapy, achieving synergistic and hypoxia-activated tumor treatment with a low risk of side effects. Moreover, the nanoplatform exhibits computed tomography imaging functions for combined diagnosis and treatment. Our designed nanoplatform overcomes the dilemma of insufficient efficacy from conventional therapy attributed to a hypoxic environment, expecting to guide the design of future treatment regimens for hypoxic tumors.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2022
·
IF 4.326
Xiaoying Gao,Yunjia Liu,Ke Zhang,Jinlan Weng,Rongqing Chen,Xiaoyi Zhang,Zhipeng Wang,Shenghong Yang,Jian Liu
External light stimuli strategy under conventional conditions achieves a sustainable future due to its controllable spatial and temporal precision coupled with environmental friendliness. Herein, atomic Cu(I)-carbon nitride (Cu-CN) was synthesized and served as specific light-stimuli oxidase mimics for total antioxidant capacity (TAC) assay. Singlet oxygen (1O2) and hydroxyl radical (·OH) are the main intermediates, which can oxidize 3,3′,5,5′-tetramethylbenzidine (TMB) into its blue oxidant and therefore improve photothermal signal generation. Based on the intrinsic light responsiveness and photothermal conversion property, we established a colorimetric and photothermal dual-mode sensing platform. The proposed dual-mode assay presented a specific assay of ascorbic acid with LOD of 0.28 μM and 0.15 μM, respectively. This platform was further successfully applied to assess TAC of fruits and beverages. It is believed that the intelligently modulated activity and dual-mode detection function of such atomic enzyme mimics can offer a promising strategy for other analytical assays in high repeatability and reproducibility.
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COMPOSITE STRUCTURES
·
2022
·
IF 6.603
Chanyuan Wu,Yibo Qu,Yifan Wen,Shen Gong,Zhenghong Zhu
Blindly increasing the content of conductive fillers is difficult to meet the requirements of flexibility and efficient shielding at the same time. In this paper, Cu and Fe bimetallic heterostructure nanoparticles are formed on the surface of CNTs by liquid-phase co-deposition. By taking into account the electrical conductivity of Cu and the magnetic conductivity of Fe, the electromagnetic properties of CNTs are greatly improved. By controlling the temperature gradient to realize the directional solidification of ice crystals combined with freeze-drying process, the flexible (Cu/Fe)@CNT/SA/CNF/PDMS composites with three-dimensional layered structure are successfully prepared. Adding only 1 wt% of (Cu/Fe)@CNT, the EMI-SE of the composite can reach 21 dB (the absorption loss ratio reaches 85.25 %), which is nearly 50 % higher than that of CNT/SA/CNF/PDMS composite. In addition, multi-scale modeling confirms that the introduction of Cu and Fe bimetallic heterostructure nanoparticles and three-dimensional multilayer structure greatly increase the absorption loss of the composites.
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Journal of Energy Storage
·
2023
·
IF 9.4
Dongji Wu,Xiaobin Gu,Qin Sun,Weimin Luo,Bobo Zhang,Jiangang Peng,Liang Bian,Kaijun Dong
Phase change materials (PCMs) with high thermal storage density and constant working temperature suffer from low thermal conductivity , hindering their large-scale application. Herein, in situ reduction deposition of Cu, a relatively inexpensive and highly thermally conductive metal, on PCM carrier has been proposed to mitigate the low thermal conductivity issue of PCMs. Specifically, through the in-situ reduction method, the copper nanoparticles (Cu NPs) are firstly deposited on the surface and in the pore channels of the carrier (i.e., diatomite). Then the Cu-deposited diatomite was used to encapsulate paraffin as PCM to prepare composite phase change materials (CPCMs). The latent heat of the prepared CPCMs reached 78.6 J/g, and the associated thermal conductivity reached 0.561 W m −1 K −1 , which is 97.5 % and 48.9 % higher than that of paraffin and paraffin/diatomite, respectively. Compared with the traditional method of simply adding thermal conductive particles , the proposed in-situ deposition method is more effective owing to the reduced contact thermal resistance between the interfaces of different materials. The prepared CPCM was an ideal candidate for energy storage due to its high latent heat, good thermal conductivity, appropriate phase change temperature , good shape stability, thermal stability, and thermal reliability. As such, the study results provide a new, low-cost and effective method for the thermal conductivity enhancement of CPCMs.
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CHEMOSPHERE
·
2023
·
IF 8.8
Lixin Li,Ying Lv,Chao Jia,Dawei Yin,Zilong Dong,Zhaoshun Zhan,Jiazhen Han,Jun Zhang
Traditional sludge disposal is currently restricted by the risk of secondary pollution. Sludge carbon material has gained widespread attention because of its low cost and environmentally sustainable properties. However, owing to the high ash content and low–energy density of sludge, sludge pyrolysis alone has certain limitations, and the performance of carbon materials needs to be improved. Herein, a sludge–cyanobacteria composite carbon (SCC) was easily synthesized, and the adsorption process of Cu(II) and Cr(VI) by SCC was examined. SCC-700-2-50% exhibited a high S BET (1047.54 m 2 /g) and developed pore structure rich in functional groups (such as –NH, –OH, and C–O). The combination of pore structure and functional groups improved the adsorption performance of SCC. The adsorption processes exhibited a synergistic effect in a binary system: the q m of Cu(II) and Cr(VI) were 386 mg/g and 341 mg/g, respectively, and the selectivity of Cu(II) adsorption by SCC was greater than Cr(VI). The adsorption process, examined by SEM-EDS, FTIR, and XPS analysis, indicated that Cu(II) as a cationic interface strengthens Cr(VI) adsorption through electrostatic interaction, and the anion Cr(VI) created a valid electrostatic shield against the electrostatic repulsion between H + and Cu(II), facilitating Cu(II) adsorption. SCC had great reusability: Cu(II) and Cr(VI) adsorption capacity were 90% and 84%, of the initial adsorption capacity, respectively, after six cycles. This study demonstrates the prospect of SCC as a valid adsorbent for multiple heavy metal contaminations removal.
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