RSC Advances
·
2017
·Vol. 7
·期 86
·54460-54467
·
IF 3.108
Xiaoyun Lin,Yanfang Wang,Wenhui He,Yongnian Ni,Serge Kokot
Nanostructured Co3O4 with near-cubic morphology was synthesised using the solvothermal method, and a non-enzymatic electrochemical glucose sensor (Co3O4–CuNPs/Pt) was successfully constructed by dropping and potentiostatic depositing technologies. The obtained Co3O4 and Co3O4–CuNPs were characterised and investigated by X-ray powder diffraction, scanning electron microscopy, transmission electron microscopy, energy dispersive X-ray spectroscopy and X-ray photoelectron spectroscopy. Quantitative analysis of glucose was performed using the amperometric (i–t) method, and a plot of current difference versus concentration of glucose was linear in the range 0.5–336 μM, with a linear correlation coefficient (R2) of 0.9989 and limit of detection (LOD) of 0.43 μM. When the linear range was reduced to 0.5–76.5 μM, R2 and LOD were 0.9997 and 0.17 μM, respectively. The sensitivity of the sensor was evaluated as 3.58 × 104 and 4.03 × 104 μA μM−1 cm−2 for the above two linear ranges, respectively. This novel sensor produced satisfactory reproducibility and stability and was applied to monitor trace amounts of glucose in human serum samples.
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Nanoscale
·
2017
·Vol. 10
·期 4
·1631-1640
·
IF 7.367
Lingcan Kong,Xuefeng Chu,Chuanxi Wang,Hong Zhou,Yukang Wu,Wenwei Liu
The aggregation-induced emission (AIE) behavior of metal nanoclusters has attracted much attention owing to their extensive application prospects in bio-imaging and chemical sensors. However, the intrinsic mechanism of metal nanoclusters’ aggregation-induced emission is still not very clear. Herein, Cu nanoclusters S1 and Ag(I)-doped Cu/Ag nanoclusters S2 and S3 coated with D-penicillamine are designed and synthesized by a self-assembly strategy. S1–S3 show strong luminescence properties with luminescence quantum yields as high as 11.4%–14.2%. Moreover, their luminescence peak position shows an obvious hypsochromic shift from 615 (S1) to 570 nm (S3). With the introduction of Ag(I) ions, the assembly morphology also shows clear changes from the irregular assembly structure (S1) to large spherical particles with the average size of 0.18 μm for S2 and 0.47 μm for S3. A detailed investigation of high-resolution transmission electron microscopy (HRTEM) images, X-ray diffraction (XRD) patterns, ESI-TOF-mass spectra, UV-vis absorption spectra, photoluminescence spectra and luminescence lifetimes of Cu/Ag nanoclusters S2 and S3 indicates that Cu/Ag nanoclusters are actually a Cu/Ag alloy nanocluster superstructure and the microscopic arrangement of S2 and S3 is more compact and ordered relative to S1. The more compact and ordered Cu/Ag alloy nanocluster superstructure enhances the metal–metal interaction of inter-nanoclusters and intra-nanoclusters and facilitates the radiative transition of ligand-to-metal charge transfer (LMCT) and/or ligand-to-metal–metal charge transfer (LMMCT), which results in the aggregation-induced emission phenomenon. In addition, an enhanced metal–metal interaction increases the average metal–metal distance of the Cu/Ag nanocluster superstructure, leading to a hypsochromic shift of emission spectra. Furthermore, the Cu/Ag alloy nanoclusters show good stability and reversibility on pH cycling between pH = 3 and 7 and temperature cycling between 5 °C and 48 °C. The Cu/Ag alloy nanoclusters can be used as probes for Ag(I) ion and halide anion detection in real water samples by the ratiometric PL method (I570/I615).
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PROTEINS-STRUCTURE FUNCTION AND BIOINFORMATICS
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2024
·
IF 3.2
Wenwei Tang,Zuxun Huang,Yunying Liu,Xinping Zeng
The microbial manganese removal process is believed to consist of the catalytic oxidation of Mn(II) by manganese oxidase. In this study, the multicopper oxidase CopA was purified and exhibited high manganese oxidation activity in vitro, and it was found that Cu(II) can significantly enhance its manganese oxidation activity. Gene site-directed mutagenesis was used to mutate four conserved copper binding sites of CopA to obtain four mutant strains. The manganese removal efficiencies of the four strains were determined, and it was found that H120 is the catalytically active site of CopA. The loss of Cu(II) and the mutation of the conserved copper binding site H120 resulted in the loss of ethoxyformyl and quinone modifications, a reduction in the number of modifications, and a change in the position of modifications, eventually causing a decrease in protein activity from 85.87% to 70.1%. These results reveal that Cu(II) and H120 play an indispensable role in manganese oxidation by the multicopper oxidase CopA. X-ray photoelectron spectroscopy (XPS) analysis indicates that biogenic manganese oxides produced by strains and by CopA were both composed of MnO 2 and Mn 3 O 4 and that the average valence of Mn was 3.2.
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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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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
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2024
·
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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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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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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ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Yifan Cui,Dezhi Yang,Qiulan Li,Zhongmei Peng,Zitao Zhong,Yuzhu Song,Qinqin Han,Yaling Yang
Nanozyme-mediated antioxidative therapy is a promising star for treating a myriad of important diseases through eliminating excessive reactive oxygen species (ROS) such as O2·– and H2O2, a critical mechanism for inflammatory bowel disease (IBD). This work provides a high biocompatibility iodine–copper–zinc covalent doped carbon dots (Cu,Zn,I-CDs) with the catalase (CAT)-, superoxide dismutase (SOD)- and glutathione peroxidase (GPx)-like catalytic activities for treating ulcerative colitis (UC) by scavenging overproduced ROS. We found that I dopant aids in counteracting the positive charge at Cu,Zn dopants brought on by low pH, enabling Cu,Zn,I-CDs to process strong triple antioxidant nanozyme activities rather than Cu,Zn-CDs. Vitro experiments displayed that the Cu,Zn,I-CDs could scavenge the excessive ROS to protect cellular against oxidative stress and reduce the expression of proinflammatory cytokines, such as TNF-α, IL-1β, and IL-6. In sodium dextran sulfate (DSS)-induced colitis mice models, Cu,Zn,I-CDs with excellent biocompatibility could effectively relieve the inflammation of the colon, containing the reduction of the colon length, the damaged epithelium, the infiltration of inflammatory cells, and upregulation of antioxidant genes. Therefore, the therapy of Cu,Zn,I-CD antioxidant nanozymes is an effective approach and provides a novel strategy for UC treatment.
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Catalysts
·
2024
·Vol. 14
·期 12
·929
·
IF 3.8
Jingxin Tan,Mengqi Li,Lingtao Liu,Lijian Wang,Haocun Wang,Junjie Bian,Chunhu Li
Biomass platform compound 5-Hydroxymethylfurfural (HMF), with its low price and abundant source, can be used as a renewable resource to replace traditional petrochemicals. MOF-808(Zr) has tunable active sites and excellent stability under high temperatures and acidic as well as basic environments, and the unsaturated coordination of metal ions within its framework structure can exhibit Lewis acidity, facilitating catalytic transfer hydrogenation from HMF to 2, 5-Furandimethanol (BHMF). The hydrothermal–impregnation–reduction method was used to prepare Cu/MOF-808 catalysts with high catalytic performance. Formic acid was chosen as the hydrogen donor solvent. The selectivity and yield of BHMF were 75.65% and 71%, respectively, at 150 °C for 4 h. A reaction pathway for the catalytic hydrogen transfer of HMF to BHMF was proposed. The high activity and stability of the Cu/MOF-808 catalyst with dual active sites provide a viable method for feasible hydrogenation of HMF to high value-added compounds.
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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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