INDUSTRIAL CROPS AND PRODUCTS
·
2025
·
IF 6.2
Zhanjun Li,Yunwei Liu,Mingru Kong,Yibin Xu,Kunlun Wang,Ke Ma,Qi Shen,Qingfen Zhang
To increase the extraction efficiency of quercetin from Pinus koraiensis seed scales (PKSS), an innovative chitosan-Cu-Fe (CS-Cu-Fe) ionic liquid system for efficient ultrasonic-assisted extraction (UAE) of PKSS quercetin (PKSSQ) was designed. A first-order kinetic model was applied to analyse the extraction performance, and key factors influencing the process were systematically optimized. The optimal conditions were as follows: 2.00 g sample, 0.016 mol [BMIM]Br, 0.6 %, 100 W, 53°C, 12:1 mL/g, and 14 min. Under these conditions, the actual PKSSQ yield was 2.92 mg/g ± 0.02 mg/g, which closely aligned with the theoretical yield of 2.96 mg/g. The extraction kinetics were compared across different methods, and the stability of the CS-Cu-Fe system was evaluated through recovery experiments. The CS-Cu-Fe was characterized using Fourier transforms infrared (FT-IR) spectroscopy, thermogravimetric analysis (TGA), X-ray diffraction (XRD), hysteresis loop (HL) measurement, electrical conductance (EC) measurement and scanning electron microscopy (SEM) of the extracted residues. CS-Cu-Fe demonstrated exceptional thermal stability, magnetic properties, and catalytic activity, significantly enhancing the PKSSQ extraction efficiency. FT-IR analysis revealed minimal spectral changes in CS-Cu-Fe, with notable EC differences. Owing to its stable core functional groups, CS-Cu-Fe maintained excellent thermal stability, crystal structure, soft magnetism, and catalytic efficiency. This study highlights the efficiency of the CS-Cu-Fe ionic liquid system in UAE of PKSSQ and the role of its stable core functional groups in improving the extraction and catalytic performance. This innovative approach provides a robust theoretical foundation for extracting and developing natural products from PKSS, with promising future applications.
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VACUUM
·
2024
·
IF 3.8
Xingtao Cheng,Yi He,Siming Yan,Ruxia Song,Zhiyuan Li,Liping Yan,Hongjie Li,Kaijun Wei,Qing Yuan,Shijun Xu
In this study, a pulsed electrodeposition approach was used to create a Ni-Cu/ZrB 2 composite coating on the surface of J55 steel. Ni-Cu/ZrB 2 composite coatings with different material additions were prepared, and the surface morphology, grain size, microhardness and wear and corrosion resistance were investigated. The results confirmed that the embedding of ZrB 2 in the Ni-Cu coating can refine the grains and make the coating surface denser. Furthermore, ZrB 2 can effectively increase the wear resistance and corrosion resistance of the coating; the Ni-Cu/ZrB 2 (1.0 g/L) composite coating reflects this by having the shallowest and narrowest wear cross-section as well as the lowest average friction coefficient (0.537). Additionally, the composite coating has the highest impedance modulus, reaching 83.60 kΩ/cm 2 . The composite coating improved corrosion resistance by 63.1 % compared to the pure sample. The enhancement in the coating's corrosion resistance can be attributed to three factors. Firstly, the addition of zirconium diborate refines the coating grain and changes the corrosion type from pitting corrosion to homogeneous corrosion. Secondly, zirconium diborate forms a physical barrier against corrosive ions. Lastly, the formation of the oxide layer on the coating during the process of corrosion, also enhances the material's resistance to corrosion.
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THERMOCHIMICA ACTA
·
2024
·
IF 3.1
Jiaming Liu,Xinwen Ma,Wenhao Wang,Weiduo Fei,Xiandie Zhang,Xiang Ke,Xiang Zhou
In this study, Cu(OH)F nanoparticles are prepared through a simple hydrothermal reaction and their effects on the thermal oxidation and ignition characteristics of micron-sized Al powder (μ-Al) are explored for the first time. Thermal analysis in air atmosphere (50∼1050 °C) shows that compared to raw μ-Al, the normalized weight gain of Al in Al-Cu(OH)F increases by about 36.9%, 64.8%, and 106.3% when the added Cu(OH)F is 1 wt%, 3 wt%, and 5 wt%, respectively. After mixed with NH 4 ClO 4 , electric ignition and open-air combustion tests show shortened ignition delay time (by 42.6%∼63.8%) and increased maximum light intensity (by 48.9%∼117.8%) for Al-Cu(OH)F. The effects of Cu(OH)F result from its decomposition products, namely, HF and CuO. HF reacts with alumina shell to form AlF 3 , which sublimes at high temperature and thus exposes Al core instantly, while CuO can react with Al core to release heat, further facilitating the thermal oxidation and ignition processes.
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TOPICS IN CATALYSIS
·
2024
·
IF 2.8
Gao Ya,Fang Yarong,Wang Weiwei,Nie Guangze
The application of Co 3 O 4 in activated PMS degradation of organic pollutants has been widely concerned. Due to the limited catalytic performance of pure cobalt catalyst, a novel Cu-Co nanocomposite catalyst was synthesized in this paper for activating PMS to degrade tetracycline (TC). After a small amount of copper was introduced, Cu-Co nanocomposite displayed significant heterogeneous catalytic activity in the activation of PMS. Efficient and rapid degradation of TC was achieved under various pH conditions in the Cu-Co nanocomposite/PMS catalytic system. The generation of a large number of singlet oxygen ( 1 O 2 ) is the dominant factor in TC degradation. This study improved the practicality of the PMS activation system across various environmental conditions. Cu-Co nanocomposites exhibit exceptional catalytic properties, rendering them promising catalysts for practical applications.
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JOURNAL OF MOLECULAR STRUCTURE
·
2024
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IF 4
Lingmin Wu,Baitao Li
The present study assessed the catalytic performance in epoxidation of styrene using tert ‑butyl hydroperoxide (TBHP) as an oxidant over single-atomic copper-doped Ordered mesoporous alumina (Cu-OMA) composited with g -C 3 N 4 (CN). The thermal treatment at three temperatures (300, 500, 700 °C) provided a facile mean to modify the texture and electronic structure of the Cu-OMA@CN composite. The X-Ray absorption spectroscopy proved the single-atomic Cu-O-Al and Cu-O-C in Cu-OMA@CN-500 catalyst. Catalytic reaction parameters, namely temperature (60–80 °C), catalyst amount (10–70 mg), substrate/oxidant ratio (1:1–1:3), and solvents (acetone, ethanol, acetonitrile, N, N-dimethylacetamide) were optimized to obtain high conversion of styrene and selectivity to styrene epoxide. Under the optimized reaction conditions (75 °C, 30 mg of catalyst, 1:2 of styrene/TBHP and acetonitrile as solvent), the conversion decreased in the order of Cu-OMA@CN-500 > Cu-OMA@CN-300 > Cu-OMA@CN-700. This sequence was related to the formation of electron-rich single-atom copper sites, high surface area, medium alkaline environment and high content of graphic nitrogen species in Cu-OMA@CN-500. This structure differed from the blocky structure of C 3 N 4 in Cu-OMA@CN-300 and the destroyed tri-s-triazine ring in Cu-OMA@CN-700. The most active Cu-OMA@CN-500 catalyst displayed a high styrene conversion (87.2 %) and striking selectivity to styrene oxide (90.0 %). Its catalytic activity was retained after five recyclability tests. The possible catalytic mechanism for epoxidation of styrene over this catalyst was tentatively proposed.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2024
·Vol. 35
·期 11
·1-17
·
IF 2.8
Pan Deng,Wang Yanan,Lin Liwei,Zhang Yuzhe,Zhou Man,Li Zhongyu,Xu Song
Photothermal catalytic CO 2 reduction can combine photocatalysis and thermal catalysis by using full-spectrum solar energy to convert CO 2 into high value-added chemicals. This can effectively alleviate the problems of excessive CO 2 emissions and thermal catalytic energy waste. In this paper, a novel catalyst was prepared using Ce-MOF as a precursor to generate Cu/Ni/CeO 2 for efficient reduction of CO 2 to CO by hydrogenation. Due to the rod-like structure of CeO 2 and the high dispersion of Cu and Ni nanoparticles, 10%Cu 5%Ni CeO 2 can achieve a catalytic activity of 54.21 mmol g −1 h −1 in the full solar spectrum. The supported Cu and Ni metals are the active sites for catalytic reduction. Meanwhile, Cu and Ni enhanced the light absorption ability of the catalyst and the surface temperature under illumination. This is due to the hot charge carriers generated by LSPR effect in Ni and Cu metal nanoparticles, which can dissipate energy through local heating, thus increasing the temperature of the catalyst under illumination. It can be found that the CO 2 reduction activity of photo-assisted thermocatalysis is higher than that of thermal catalysis under the same conditions. Therefore, the combined effect of the electrons generated by UV–Vis light and the heating effect of near-infrared light on catalyst could improve the catalytic activity. This work might provide a potential strategy for efficient photothermal reduction of CO 2 in the future.
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TALANTA
·
2024
·
IF 5.6
Fangyan Ji,Peilin Wang,Zhenrun Li,Kaixiang Ji,Dongyu Wang,Qiang Ma
Aggregation-induced emission (AIE) has been widely used in research on electrochemiluminescence (ECL) due to its excellent luminescence intensity. In this work, copper superparticles (Cu SPs) were used to construct ECL biosensor to detect the microRNA-103a (miRNA-103a) in triple-negative breast cancer (TNBC) tumor tissues. Firstly, GSH-capped copper clusters were used as precursors to prepare Cu SPs by the AIE effect. Compared with clusters, Cu SPs possessed higher luminescence performance and energy stability, making them an ideal choice for ECL nanoprobe. The film of PVDF-HFP/CeVO 4 NPs was constructed and modified with CPBA and GSH as the sensing interface (PCCG). The PCCG film displayed good conductivity and hydrophilicity, and desirable mechanical stability. Moreover, the PCCG film can induce high carrier mobility rates and dissociate large amounts of the co-reactant K 2 S 2 O 8 to enhance the ECL intensity of Cu SPs. As a result, the prepared ECL sensor with the catalyzed hairpin assembly (CHA) strategy was employed to quantify miRNA-103a in the range of 100 fM to 100 nM. The biosensor provided a novel analytical approach for the clinical diagnosis of TNBC.
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MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
·
2024
·
IF 4.2
Yajie Wang,Yanan Gao,Jingxuan Yang,Bin Liu
C 3 N 5 is emerging as an important visible light catalyst because of its narrow band gap, nontoxicity and thermal stability. Herein, sulfur-doped g-C 3 N 5 (SCN) was prepared by copolymerization of thioacetamide (TAA) and 3-amino-1,2,4-triazole (3-AT). Then copper nanoparticles (Cu NPs) were anchored onto the SCN framework, resulting in the formation of Cu/SCN. It was found that the average H 2 production rate of SCN and Cu/SCN was 0.76 and 1.34 mmol g −1 h −1 , which was much higher than that of C 3 N 5 , respectively. Acting as a new active spots, sulfur doping effectively reduces the band gap of g-C 3 N 5 , and the formation of S-Cu bonds further creates an efficient electron transport pathway. As a result, Cu/SCN possesses a broader visible light absorption spectrum, stronger reduction capability, and greater efficiency in photo-induced carrier separation and transfer. Therefore, this work introduces a novel strategy for design of high efficiency photocatalytic H 2 evolution carbon nitride through non-noble metal and sulfur anchoring junction.
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ACS Applied Nano Materials
·
2024
·
IF 5.3
Yubin Zhao,Xing Cao,Huanhui Chen,Ya Liu,Liubiao Zhong,Yejun Qiu
Low-dimensional metal halides are favored for optoelectronic device applications due to their strong electron–phonon coupling capability, which produces exciton self-trapping and broadband emission optoelectronic properties. Conventional methods for enhancing electron–phonon coupling involve the introduction of permanent defects or lattice distortions that inhibit the intrinsic structure and properties. In this work, we report that Cu-doped CsPb2Br5 nanocrystals exhibit broadband red emission with a high Stokes shift, a long fluorescence lifetime (9.27 μs), and a high photoluminescence quantum yield (∼ 36%) in the visible to near-infrared spectral range (∼550 to 825 nm). At the same time, the fact that the emission spectrum is independent of the excitation wavelength and the excitation spectrum is independent of the emission wavelength, together with the similarity of the decay kinetics, suggests that the broad-band emission has intrinsic properties. The soft vibrational modes of Raman spectroscopy indicate the softness of the lattice and the highly anharmonic character of the structure on the global and local scales. These properties lead to short-range elastic lattice deformation of Cu/CsPb2Br5 nanocrystals upon photoexcitation by strong electron–phonon coupling, resulting in self-trapped exciton emission. This method of doping-induced local distortion and exciton self-capture provides a way to improve the properties of the optoelectronic materials. Meanwhile, the fluorescence change in the crystal structure from CsPbBr3 to CsPb2Br5 can also be used for anticounterfeiting inks. Therefore, CsPb2Br5 crystals have promising applications in solid-state lighting and optoelectronic devices.
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Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Long Zhou,Houying Yuan,Hui Li,Songhua Chen,Pingping Zhao,Ruiming Zhang,Zeyang Lu,Zuliang Chen
Efficient catalyst development for hydrogen peroxide activation is crucial in advanced oxidation processes (AOPs) technology. In this study, we successfully synthesized a bimetallic organic framework incorporating Cu-Co MOF nanosheets via a one-pot strategy. The subsequent Cu-Co MOF nanosheets demonstrated outstanding oxidative activity, achieving a remarkable 95.37 % removal of norfloxacin (NOR), surpassing the efficacy of Cu MOF/H 2 O 2 or Co MOF/H 2 O 2 nanosheets alone by 1.34 and 2.59 times, respectively. Density functional theory (DFT) calculations revealed that the bimetallic MOF nanosheets: firstly, enhanced optimization of the adsorption energy for H 2 O 2 activation; and secondly, facilitated the cleavage of the O–O bond in H 2 O 2 . Furthermore, electrochemical impedance spectroscopy (EIS) analysis demonstrated a significant improvement in interfacial electron transfer once dual-reaction centers were introduced into the Cu-Co MOF nanosheets. Electron paramagnetic resonance analysis and quenching tests confirmed that 1 O 2 , · O 2 − and · OH were involved in NOR degradation. Reasonable NOR degradation pathways were proposed by analysing the results of LC-MS and DFT calculations. Moreover, the synthesized nanosheets exhibited excellent reusability, with more than 90.00 % NOR removal achieved using the Cu-Co MOF nanosheets/H 2 O 2 system after reuse on 3 occasions. These findings underscore the effectiveness of bimetallic MOF construction in developing highly efficient MOF-based Fenton-like catalysts. Also highlighted here is the promising role of Cu-Co MOF nanosheets in wastewater treatment, particularly for the removal of antibiotics.
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ENVIRONMENTAL RESEARCH
·
2024
·
IF 7.7
Lu Qin,Peng She,Panlong Si,Suqin Liu,Gaopeng Dai,Cong Pan
Photocatalytic production of H 2 O 2 is indeed a safe, sustainable and cost-effective technology, offering an environmentally friendly solution to the energy crisis through solar photocatalysis. However, it still faces challenges such as reliance on organic electron donors and pure O 2 , as well as inefficiencies in hole utilization. To overcome these limitations, a dual-channel photocatalytic system has been developed. In this study, we showcase the efficiency of the CuO/Cu(OH) 2 @g-C 3 N 4 composite, derived from CuBTC/g-C 3 N 4 via NaOH treatment, as a high-performance dual-channel photocatalyst for H 2 O 2 production. Under visible light (λ ≥ 420 nm), this composite achieves a H 2 O 2 yield of 1354 μmol/L in 120 min without any sacrificial agent, outperforming g-C 3 N 4 by 8.4 times, CuO by 13.6 times and CuO@g-C 3 N 4 by 1.9 times. Quenching experiments and electron paramagnetic resonance spectra confirmed that HO • and O 2 •− are intermediate products in the photocatalytic process, following a two-step single-electron reaction pathway. The superior activity of CuO/Cu(OH) 2 @g-C 3 N 4 in H 2 O 2 generation can be attributed to the synergistic effects of OH bonds on the CuO@g-C 3 N 4 Z-type heterojunction and Cu(OH) 2 . This research presents a straightforward and promising approach for developing highly efficient photocatalysts for energy conversion.
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ACS Applied Nano Materials
·
2024
·
IF 5.3
Xiangwei Yuan,Yao Jin,Junchun Guo,Qain Wang,Li Xu,Yongjiao Song,Xiaoli Xiong
N-doped hollow carbon spheres loaded with Cu single atoms (Cu SAs/N-CSs) were prepared via an in situ hard-template method. As an electrode catalyst, the Cu SAs/N-CSs electrochemical-sensing properties to hydroquinone (HQ) and catechol (CC) were investigated by cyclic voltammetry (CV) and differential pulse voltammetry (DPV), and the linear detection ranges of HQ and CC were 1–324 and 1–123 μM, respectively; the detection limits are 0.33 and 0.17 μM, respectively. The experimental and DFT calculation results show that Cu SAs/N-CSs have stronger adsorption strength and more effective affinity for CC and HQ due to the synergistic effect of dispersed Cu SAs and N-CSs, thus improving the electrocatalytic and sensing properties of CC and HQ. Furthermore, the prepared electrode has been successfully applied to the simultaneous determination of HQ and CC in practical water samples with satisfactory results.
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