Nano Research
·
2024
·
IF 9.5
Shen Huidong,Yang Chunming,Hong Song,Hao Leiduan,Xu Liang,Robertson Alex W.,Sun Zhenyu
Semiconductor-based photocatalysis by utilizing solar energy for sustainable organic pollutant elimination has been a promising tactic to alleviate environmental issues. Nevertheless, the development of robust and efficient photocatalysts to degrade organic pollutants still faces major challenges because of insufficient charge separation. Here we design and fabricate a heterojunction consisting of copper, carbon-modified TiO 2 , and sulfur-doped g-C 3 N 4 nanosheets (i.e., S-C 3 N 4 /Cu/C-TiO 2 ). The heterostructure affords a remarkable synergistic photocatalysis for tetracycline hydrochloride degradation, achieving an 82.6% removal efficiency within 30 min under visible light irradiation, about 15.4 and 7.3 times higher than that of S-C 3 N 4 and C-TiO 2 , respectively. The superior performance is attributed to the synergy between Cu doping and the Z-scheme heterojunction, which not only enhances the interfacial electric field effect, facilitating charge separation, but also boosts the redox capability. The charge carrier transfer between Cu/C-TiO 2 and S-C 3 N 4 follows a Z-scheme, as verified by trapping experiments, electron spin-resonance spectroscopy, and density functional theory calculations. Furthermore, the tetracycline hydrochloride degradation pathways are enunciated by liquid chromatograph mass spectrometry analysis. This work provides an effective approach for constructing high-performance photocatalysts that have potential in environmental remediation.
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ACS Catalysis
·
2025
·
IF 13.1
Shiyan Li,Xu Liu,Jun Ma,Feifei Xu,Yuan Lyu,Siglinda Perathoner,Gabriele Centi,Yuefeng Liu
The high-temperature reverse water–gas shift (RWGS) is an industrially relevant reaction. Cu-based catalysts easily sinter and deactivate under these conditions. We demonstrate that it is possible to obtain high-performance and stable catalysts by modifying the mechanism of action. Cu/CeOx-MgO (denoted as Cu/CexMgy) catalysts were developed in which Cu nanoparticles mostly generate spillover H that migrates to support sites where CO2 is selectively reduced, with the rate controlled by the oxide–oxide CeOx-MgO interface. An optimal Cu/Ce0.05Mg0.95 catalyst (in terms of performance at the lowest possible Ce amount) exhibits a near-equilibrium CO2 conversion with a reaction rate of 516.0 μmol·gcat–1·s–1, near-total selectivity to CO at 600 °C, and a high space-velocity of 300,000 mL·gcat–1·h–1. These are among the top performances in the RWGS reaction. Extensive characterization data have proven that the surface-abundant Ce-[Ov]-Mg sites play a critical role in CO2 adsorption/activation as well as the carrier for the spillover of hydrogen species. The mechanism is substantially different from those indicated for Cu-based catalysts for CO2 hydrogenation. By decoupling H and CO2 activation sites and realizing efficient surface mobility of H-spillover species via an enhanced oxide–oxide interface, it is possible to maintain the overall stability and activity of the catalyst when the Cu nanoparticles sinter at a high temperature (i.e., ≥600 °C).
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ChemSusChem
·
2024
·
IF 7.5
Rui Yang,Xiaozhong Zheng,Hao Fu,Xinyue Cao,Yangguang Hu,Yiyin Huang
Graphical Cu 7 S 4 /Cu nanoflowers with strong CO 2 adsorption and abundant boundaries were developed by a facile thermal reduction, which underwent in situ dynamic restructuring during ECR to generate highly active S-doped Cu 2 O/Cu hybrid catalyst. Thermodynamic and experimental analysis revealed that the optimized adsorption of the HCOO * intermediate on S−Cu 2 O/Cu was regulated and surface H was suppressed by S-doping. The high activity for CO 2 -to-HCOOH attributed to the strengthen CO 2 adsorption, abundant boundaries at Cu 2 O/Cu interfaces, and the regulation of adsorption energy by S-doping Optimized catalytic properties and reactant adsorption energy played a crucial role in promoting CO 2 electrocatalysis. Herein, Cu 7 S 4 /Cu underwent in situ dynamic restructuring to generate S−Cu 2 O/Cu hybrid catalyst for effective electrochemical CO 2 reduction to formate that outperformed Cu 2 O/Cu and Cu 7 S 4 . Thermodynamic and in situ Raman spectra revealed that the optimized adsorption of the HCOO* intermediate on S−Cu 2 O/Cu was regulated and the H 2 pathway (surface H) was suppressed by S-doping. Meanwhile, Cu 7 S 4 /Cu nanoflowers created abundant boundaries for ECR and strengthened the CO 2 adsorption by inducing Cu. These findings provide a new perspective on synthetic methods for various electrocatalytic reduction processes.
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PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Lixin Song,Guobin Liu,Zhenping Qu
CO 2 hydrogenation to methanol and/or dimethyl ether (DME) holds promise for mitigating greenhouse gas effects and addressing energy scarcity. However, the relationship between product selectivity and the collective nature of the catalysts remains ambiguous due to the intricate reaction network. Here, a series of Cu/Zn x Al y O z catalysts with different surface properties have been engineered by manipulating the Zn/Al ratio to achieve product controllability for CO 2 hydrogenation. The results unveil the pivotal role of the H 2 dissociation capability in governing CO 2 conversion, which is regulated by the concentration of Cu 0 species. Furthermore, the number of surface hydroxyl groups, the proportion of moderately strong basic sites and moderately strong acidic sites show desirable linear correlations with the selectivity of CO, CH 3 OH, and DME, respectively. Importantly, the ZnAl 2 O 4 -Al 2 O 3 or Cu-ZnAl 2 O 4 -Al 2 O 3 interface notably enhances moderately strong acidic sites, aiding methanol dehydration to DME. This work offers a comprehensive guide to the rational design of catalysts for oriented product synthesis from CO 2 hydrogenation.
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SCRIPTA MATERIALIA
·
2024
·
IF 5.3
Mengyun Jia,Dingliang Liang,Qing Du,Hui Wang,Yuan Wu,Suihe Jiang,Xiaobin Zhang,Haihui Ruan,Xiongjun Liu,Zhaoping Lu
Magnetothermal therapy (MT) is a noninvasive cancer treatment that has shown great promise in recent years. However, the low magnetothermal efficiency of the existing magnetic nanoparticles used in MT has been an obstacle to their widespread applications. In this work, we report a new class of Fe-Co-Ni-Cu high-entropy magnetic nanoparticles (HEMNPs) with exceptional magnetothermal properties synthesized by a thermal decomposition method. The fabricated HEMNPs, having an average diameter of 60–70 nm, exhibited a saturation magnetization of 42.4 emu/g and coercivity of 129.5 Oe. The hyperthermia measurement reveals that the HEMNPs have a maximum specific loss power of 202 W/g at the concentration of 2 mg/ml under an alternating magnetic field with an intensity of 46 Oe and a frequency of 266 kHz, demonstrating the great potential for MT applications. Our results demonstrate that the high-entropy concept can be extended to develop high-performance magnetic nanoparticles for MT applications.
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ACS Applied Nano Materials
·
2024
·
IF 5.3
Yi Gao,Tingting Chu,Chengyu Zhou,Wensheng Huang,Yin Zheng
In this paper, iron–copper bimetallic nanosheet materials (FeCu/CNS) were prepared using hydrothermal and pyrolysis methods to develop a dual-mode electrochemical and colorimetric sensing platform for detecting acetaminophen (ACM). The glassy carbon electrode (GCE) was modified with FeCu/CNS to enhance its electrocatalytic activity and develop an electrochemical sensor for detecting ACM. The linear range of the sensor was 0.01–7 × 10–6 mol/L, and the detection limit (LOD) was 2.5 × 10–8 mol/L. In addition, FeCu/CNS possesses an efficient peroxidase-like activity that converts colorless 3,3′,5,5′-tetramethylbenzidine (TMB) into a blue oxidized state product (oxTMB) in the presence of H2O2, which exhibits a characteristic absorption peak around 652 nm. However, ACM has reducing properties and can reduce oxTMB to TMB, thereby reducing the intensity of the characteristic absorption peak of oxTMB. Based on this principle, a colorimetric sensor was constructed for the detection of ACM, which had a linear range of 0.5–1625 × 10–6 mol/L and an LOD of 2.63 × 10–6 mol/L. Compared with other single methods, the method exhibited a wider linear range and lower detection limit, confirming the complementary and superior nature of the dual-mode sensor designed in this paper for ACM detection. Meanwhile, the detection of ACM in human serum was also carried out with satisfactory results.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Jia-Xu Shuang,Jie Sheng,Yunzhong Wu,Manyu Liu,Changsheng Xing,Rui Liu,Tong Zhang,Bin Liu,Yekang Guan,Lidong Wang,Weidong Fei
Graphene/copper composites demonstrate outstanding mechanical and electrical properties, making them suitable for a wide range of applications. Among the various methods for preparing graphene/copper composites, the in-situ synthesis approach has gained significant attention due to its simplicity and potential for commercial scalability. In this study, we report a mechanochemical method that utilizes terphenyl as a carbon source for the in-situ preparation of Gr/Cu composites. In this approach, mechanical force is utilized to induce polymerization of terphenyl, as opposed to thermal catalysis. Compared to pure copper, the yield strength of the composite with 0.1 wt% carbon addition increased by 13.7%, and its conductivity improved by 3.8%IACS. The composite also exhibited a higher strengthening efficiency of 86.7%. A harmonic structure within the composite was observed, which contributes to increased strength while maintaining a certain degree of plasticity. The structural evolution of graphene during the mechanochemical process was analyzed, and a hypothesis was proposed to explain the structure changes during polymerization. This study presents a novel method and valuable insights for the preparation of Gr/Cu composites through mechanochemical processes.
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Surfaces and Interfaces
·
2025
·
IF 6.3
Chenghao Zhang,Changlong Tan,Yang Liu,Chun Li,Xiaoqing Si,Zongjing He,HaiFeng Zhang,Jian Cao
The fabrication of surfaces with varying wettability is crucial for developing Janus materials. In this study, a Janus Cu/Ti mesh with asymmetric wetting surfaces is fabricated using diffusion bonding. The Ti and Cu meshes are bonded through vacuum hot-pressing, forming a two-layer compositing, and the CuTi intermetallic compound is found at the interface. High-density TiO 2 nanostructures are synthesized on the Ti wire via hydrothermal treatment in NaOH. Subsequent immersion in a stearic acid solution, renders the Cu mesh hydrophobic, while the Ti mesh retains its hydrophilic properties, resulting in a Janus Cu/Ti mesh with asymmetric hydrophobic/superhydrophobic behavior. The unidirectional transport properties of this Janus mesh, including water penetration and bubble/oil manipulation, are systematically studied. Additionally, a superhydrophobic/hydrophilic Janus mesh is achieved by synthesizing CuO nanosheets on Cu mesh and applying surface modifications. This approach broadens the technological framework for fabricating Janus materials and enhances the potential applications of diffusion bonding, highlighting its versatile prospects.
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Surfaces and Interfaces
·
2024
·
IF 5.7
Jun-Qing Ye,Pin-Xi Wang,Xin Rong,Qi-Da Ding,Jun-Feng Qian,Sheng-Chun Chen,Ming-Yang He,Qun Chen
Vinylsilane compounds are essential chemical feedstocks and intermediates in organic synthesis. A heterogeneous Cu-containing mesoporous ZSM-5 zeolite catalyst developed through an in-situ doping method can be used for preparing vinylsilane compounds via decarboxylative coupling with remarkable catalytic efficiency. The mesoporous structure along with the appropriate surface area and pore volume of the catalyst is likely to be responsible for facilitating mass transfer in the reaction process. Additionally, due to the suitable Brønsted and Lewis acid active sites, adsorption and activation of reactant molecules can be readily triggered to promote the generation of alkoxyl radicals, which is the crucial species to complete the catalytic cycle. Importantly, the transformation exhibits high efficiency, broad substrate scope, and good reusability for at least six cycles.
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JACS Au
·
2025
·
IF 8.7
Xuan Bie,Yukun Pan,Xiaowei Wang,Shiyu Zhang,Jiahui Hu,Xiaoxiao Yang,Qinghai Li,Yanguo Zhang,Robert E. Przekop,Yayun Zhang,Hui Zhou
Gas sources rich in CO2 derived from biomass/waste gasification, anaerobic digestion, or industrial carbon capture often contain impurities such as H2S, H2O, and NH3, which can significantly hinder catalyst performance. Here, we show the role of NH3 on the reverse water–gas shift (RWGS) reaction over a commercial Cu/ZnO/Al2O3 catalyst, examining its effects on both the catalytic activity and the catalyst structure. We found that NH3 reversibly decreases CO2 conversion immediately by suppressing carbonate hydrogenation and CO desorption. This effect intensifies with an increase in NH3 concentration but decreases at higher temperatures. However, prolonged exposure (over 100 h) to RWGS conditions in the presence of 1.4% NH3 leads to near-total and irreversible deactivation of the Cu/ZnO/Al2O3 catalyst. Under NH3 exposure, the catalyst loses Cu+ sites on the surface, causing a spatial separation of Cu and ZnO. Finally, to address this challenge, we propose a novel strategy to mitigate NH3 inhibition by decomposing NH3 into N2 and H2.
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PubMed
高影响因子
SENSORS
·
2024
·Vol. 24
·期 11
·3623
·
IF 3.4
Arif Ullah Khan,Muhammad Tahir,Fazal Ul Nisa,Mizna Naseem,Iqra Shahbaz,Zeyu Ma,Zilu Hu,Abdul Jabbar Khan,Muhammad Sabir,Liang He
Metal-oxide-based gas sensors are extensively utilized across various domains due to their cost-effectiveness, facile fabrication, and compatibility with microelectronic technologies. The copper (Cu)-based multifunctional polymer-enhanced sensor (CuMPES) represents a notably tailored design for non-invasive environmental monitoring, particularly for detecting diverse gases with a low concentration. In this investigation, the Cu-CuO/PEDOT nanocomposite was synthesized via a straightforward chemical oxidation and vapor-phase polymerization. Comprehensive characterizations employing X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), X-ray diffraction (XRD), and micro Raman elucidated the composition, morphology, and crystal structure of this nanocomposite. Gas-sensing assessments of this CuMPES based on Cu-CuO/PEDOT revealed that the response current of the microneedle-type CuMPES surpassed that of the pure Cu microsensor by nearly threefold. The electrical conductivity and surface reactivity are enhanced by poly (3,4-ethylenedioxythiophene) (PEDOT) polymerized on the CuO-coated surface, resulting in an enhanced sensor performance with an ultra-fast response/recovery of 0.3/0.5 s.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Qian Liu,Wenqian Luan,Xingrong Zhang,Ruiyang Zhao,Jishu Han,Lei Wang
The design of a low-cost, efficient and durable co-catalyst for hydrogen evolution is of great significance for improving photocatalytic activity. In this work, a NiMoP 2 /Cu-ZnS composite photocatalyst was prepared by in-situ growth of NiMoP 2 on the surface of copper-doped zinc sulfide (Cu-ZnS). The test results showed that the hydrogen production rate of the optimized NiMoP 2 /Cu-ZnS under visible light irradiation was significantly improved. Among them, NiMoP 2 /Cu-ZnS-1 exhibited the highest photocatalytic activity (5.13 mmol·g −1 ·h −1 ), which was 2.47 times that of Cu-ZnS and maintained good stability during the reaction. The improvement of hydrogen production performance of the photocatalyst was mainly attributed to the synergistic effect of Cu-ZnS and co-catalyst NiMoP 2 . The ohmic contact formed between Cu-ZnS and NiMoP 2 could improve the separation efficiency of photogenerated carriers and reduce the overpotential of H 2 evolution. Besides, NiMoP 2 was found to provide the active site for the reduction reaction, and accelerate the transfer efficiency of photogenerated electrons. This strategy opens up a new way for the construction of co-catalyst modified semiconductor materials to improve the photocatalytic hydrogen production rate.
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