SEPARATION AND PURIFICATION TECHNOLOGY
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2024
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IF 8.1
Wenqi Liu,Jingyan Zhang,Mei Dong,Zhaoyi Ding,Qunfei Wang,Fanghao Ning,Qin He,Yanyan Chen,Zhen Zhao,Zhongfu Li,Conghua Liu
Low-silica chabazite (CHA) catalysts with varying configurations of Cu 2+ -2Z and [Cu(OH)] + -Z active centers are developed through the regulation of the opening of CHA-cages. The catalysts are subsequently applied to the selective catalytic reduction of NO x by NH 3 (NH 3 -SCR) reactions. A series of characterizations and performance evaluations indicate that the density of [Cu(OH)] + -Z in eight-member rings (8MRs) is positively correlated with low-temperature performance. Moreover, the presence of partial Cu 2+ -2Z in six-member rings (6MRs) enhances activity and tolerance at high temperatures. The residual K + ions in the CHA-cages after NH 4 + exchange are retained in the 6MRs. Density functional theory calculations demonstrate that the residual K + ions stabilize the 6MRs structure, ensuring the entry and stable presence of the active Cu 2+ -2Z centers. In situ analysis reveals the reaction intermediates involved in the NH 3 -SCR process on representative catalysts. These findings can further elucidate the active centers of CHA-type catalysts and guide the design of commercial catalysts.
研究领域:
催化化学
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环境科学
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产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2022
·Vol. 10
·期 9
·4758-4769
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IF 14.511
Lang He,Wenyuan Zhang,Kristin Zhao,Sheng Liu,Yan Zhao
A facile polymer thermal treatment method has been employed to fabricate 3D honeycomb-like nitrogen-doped graphitic carbons (N-GCs) with embedded core–shell Cu@Cu2O nanoparticles (NPs). The 3D honeycomb-like N-GC architectures can not only serve as an excellent carrier for core–shell Cu@Cu2O NPs, but also provide sufficient active sites and fast electron transmission channels. Under visible light irradiation, the Cu@Cu2O/N-GC-600 catalyst has the highest yields of CH4 and CO at 38.89 μmol g−1 and 27.78 μmol g−1, respectively. The excellent photocatalytic activity is attributed to the synergistic effects between the unique N-GC framework and core–shell Cu@Cu2O NPs, which accelerates the transfer of charge carriers and promotes the accumulation of photogenerated electrons on core–shell Cu@Cu2O. The results of this study may be beneficial for the design and synthesis of high-efficiency core–shell photocatalysts.
研究领域:
材料科学
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环境科学
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化学
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DOI
高影响因子
ENVIRONMENTAL RESEARCH
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2024
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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.
研究领域:
材料科学
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环境科学
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能源化学
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产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2024
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IF 7.7
Xubing Sun,Shiyu Yin,Li Zhao,Wenhua Yang,Yaohui You
In this work, tannic acid was selected as a green cross-linking agent to cross-link carboxymethyl chitosan to prepare a magnetic adsorbent (CC-OTA@Fe 3 O 4 ), which was used to remove methylene blue (MB) and Cu 2+ . CC-OTA@Fe 3 O 4 was characterized by FTIR, 13 C NMR, XRD, VSM, TGA, BET and SEM. The adsorption behavior was studied using various parameters such as pH value, contact time, initial concentration of MB and Cu 2+ , and temperature. The results showed that adsorption of MB and Cu 2+ followed the pseudo-second-order model and the Sips model. The maximum adsorption capacities were determined to be 560.92 and 104.25 mg/g MB and Cu 2+ at 298 K, respectively. Thermodynamic analysis showed that the adsorption is spontaneous and endothermic in nature. According to the results of FTIR and XPS analyses, the electrostatic interaction was accompanied by π–π interaction and hydrogen bonding for MB adsorption, while complexation and electrostatic interaction were the predominant mechanism for Cu 2+ adsorption. Furthermore, CC-OTA@Fe 3 O 4 displayed remarkable stability in 0.1 M HNO 3 , exhibited promising recyclability, and could be easily separated from aqueous solutions in the magnetic field. This study demonstrates the potential of CC-OTA@Fe 3 O 4 as an adsorbent for the removal of cationic dyes and heavy metals from wastewater.
研究领域:
环境科学
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材料科学
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产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
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2024
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IF 5.1
Chaochen Chen,Fang Lei,Ying Shi,Jianjun Xie,Lei Zhang,Lingcong Fan
The surface metallization of Si 3 N 4 ceramics with the Ag–Cu conductive paste containing CuO was systematically investigated. The interfacial reactions between CuO and Si 3 N 4 promoted the surface metallization of the ceramic substrate in an argon atmosphere. The effects of Ag and Cu relative contents on the evolution of the thick film surface morphology were studied. The electrical properties and tensile strength of composite ceramic substrates were enhanced through the generation of Ag–Cu eutectic solution within the thick film layer. The effect of brazing time on the properties of Ag–Cu/Si 3 N 4 composite ceramic substrates was investigated. Mechanical testing and scanning electron microscopy (SEM) were used to analyze the interface tensile strength of the Ag–Cu/Si 3 N 4 composite substrates and the morphology of the Ag–Cu film, and the bonding mechanism of the composite ceramic substrate was studied. When the sample was brazed at 800 °C for 20 min, the maximum tensile strength of 23.6 MPa between the Ag–Cu film and ceramic substrate was obtained, the lowest resistivity of 6.22 μΩ•cm was obtained. The bonding interface between thick film layer and the ceramic substrate formed the Ag–Cu mechanical structure was benefit for improving the comprehensive performance of the Cu/Si 3 N 4 composite ceramic substrate.
研究领域:
材料科学
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陶瓷工程
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产品关联
DOI
高影响因子
FIBERS AND POLYMERS
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2015
·Vol. 16
·期 10
·2130-2134
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IF 0.881
Chen Yingbo,Wang Biao,Zhang Shifeng,Hu Xiaoyu,Cheng Bowen,Liu Dongqing,Zhang Yufeng
Cu-BTC/PVDF composite membranes were prepared by immersing PVDF hollow fiber supporting membranes into copper acetate aqueous solution and trimesic acid ethanol solution repeatedly. Surface and cross sectional morphologies of Cu-BTC crystals on the supporting PVDF membrane were investigated using SEM. Chemical composition and crystal structure of Cu-BTC were characterized by IR and XRD. Gas permeance and separation factor for CO 2 and N 2 of the Cu- BTC/PVDF composite membrane were recorded under different pressures. The results illustrated that with increasing reaction times, the crystal layer became more in density and less in defects, resulting in decrease of gas permeance and the separation mechanism changing from convective flow to Knusen diffusion.
研究领域:
材料科学
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化学工程
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产品关联
DOI
高影响因子
CATALYSIS LETTERS
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2019
·Vol. 150
·期 1
·178-184
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IF 2.372
Li Zhi-Xin,Wei Xian-Yong,Yang Zheng,Zhang Min,Meng Xing-Long,Niu Shuo,Zhang Di,Zong Zhi-Min
Abstract Highly selective hydrogenation of furfural to furan-2-ylmethanol (FM) in isopropanol was achieved over a novel magnetic Cu–Co/C derived from zeolitic imidazolate frameworks prepared by galvanic replacement reaction. Furfural conversion and FM selectivity (FMS) are 100% and 97.2%, respectively, at 200 °C. FMS was held around 95% after 5-times recycle of the Cu–Co/C. In addition, cinnamaldehyde was completely converted with 96.8% of phenylpropanol selectivity over the Cu–Co/C at 150 °C. Graphic Abstract
研究领域:
化学工程
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催化材料科学
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DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
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2025
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IF 7.3
Feiyang Cheng,Xiangfeng Zhu,Fucheng Yun,Mengting Wei,Chen Shi,Jian Han
As one of the most widely utilized polymer coating systems, polyvinyl chloride (PVC) is extensively applied in industrial protection fields due to its excellent processability and cost efficiency. To meet rising performance demands in extreme environments, developing PVC coatings with efficient flame retardancy and smoke suppression has become a key research focus. This study developed an innovative BiOCl@Cu-MOF hybrid through an in situ growth strategy. Incorporating the additive at 15 phr increased the limiting oxygen index (LOI) from 23.4 % to 29.4 %. The PVC coating also passed the UL-94 rating test, reaching the highest V-0 level. Cone calorimetry analysis showed a 55.9 % reduction in peak heat release rate, indicating superior flame retardant behavior. In terms of smoke suppression, the coating achieved a 66.7 % decrease in peak smoke production rate. More importantly, the peak carbon monoxide production, a critical lethal factor in fires, was suppressed by 46.9 %. The PVC coating further exhibited 99.9 % antibacterial efficacy against both Staphylococcus aureus and Escherichia coli . This work establishes a pioneering design paradigm for multifunctional protective coatings, offering significant potential in fire-safe building materials, electronics encapsulation, and bio-secure applications.
研究领域:
材料科学
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化学工程
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高分子材料
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防火技术
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产品关联
DOI
高影响因子
MICROCHIMICA ACTA
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2025
·Vol. 192
·期 2
·1-11
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IF 5.3
Zhang Xiaoyu,Sun Ruimeng,Zheng Haoran,Qi Yanfei
A spherical nucleic acid (SNA, AuNPs-aptamer) into CRISPR/Cas12a system combined with poly T-template copper nanoparticles as fluorescence reporter was fabricated to establish an amplification-free sensitive method for Staphylococcus aureus ( S. aureus ) detection. This method, named PTCas12a, utilizes the concept that the bifunction of SNA recognizes the S. aureus and triggers the Cas12a cleavage activity. Then, the Cas12a enzyme cleaves the Poly T40 to generate a signal change in Poly T-Cu fluorescence, indicating the presence or absence of the target bacteria. The PTCas12a platform demonstrated a detection limit as low as 3.0 CFU/mL (3 N/S) in a wide response range of 1.0 × 10 1 –1.0 × 10 6 CFU/mL for S. aureus detection, which holds significant potential in ensuring food safety and preventing the spread of diseases. Graphical abstract
研究领域:
生物技术
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医学诊断
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食品安全
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产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
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2024
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IF 6.3
Kailin He,Shunli Zeng
CuMn, CuMnCe, and CuCe metal oxide catalysts were prepared and applied in oxidizing CO and benzene as representative volatile organic compounds (VOCs). Various characterization methods and in situ diffuse reflectance infrared Fourier transform spectra (DRIFTS) were used to explore mutual effects between CO and benzene oxidation and the role of reactive oxygen species. CuMn shows the highest activity in independent and simultaneous oxidation of CO and benzene due to its spinel Cu 1.5 Mn 1.5 O 4 structure, which gives abundant Cu + sites, acidic sites, O α , and O β . Cu + sites and O α benefit CO oxidation, while acidic sites, O α , and O β contribute to benzene oxidation, producing intermediates decomposable at low temperatures. Mechanism study reveals that benzene inhibits CO oxidation by competing for O α at low temperatures to retard carbonate intermediates formation. CO enhances benzene oxidation by promoting benzene preliminary oxidation and intermediates deep degradation. On CuMn, the formation and degradation of maleate and acetate are facilitated, while maleate and formate degradation are promoted on CuMnCe and CuCe, respectively.
研究领域:
催化化学
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环境科学
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产品关联
DOI
高影响因子
Chemical Science
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2024
·Vol. 15
·期 24
·9173-9182
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IF 7.6
Jiye Feng,Wenbiao Zhang,Danni Shi,Yingshuai Jia,Yi Tang,Yuying Meng,Qingsheng Gao
Multi-phase interfaces are promising for surmounting the energy barriers of electrochemical CO2 reduction involving multiple electron transfer steps, but challenges still remain in constructing interfacial micro-structures and unraveling their dynamic changes and working mechanism. Herein, highly active Ag/Cu/Cu2O heterostructures are in situ electrochemically restructured from Ag-incorporating HKUST-1, a Cu-based metal–organic framework (MOF), and accomplish efficient CO2-to-C2H4 conversion with a high faradaic efficiency (57.2% at −1.3 V vs. RHE) and satisfactory stability in flow cells, performing among the best of recently reported MOFs and their derivatives. The combination of in/ex situ characterizations and theoretical calculations reveals that Ag plays a crucial role in stabilizing Cu(I) and increasing the CO surface coverage, while the active Cu/Cu2O interfaces significantly reduce the energy barrier of C–C coupling toward the boosted ethylene production. This work not only proves MOFs as feasible precursors to derive efficient electrocatalysts on site, but also provides in-depth understanding on the working interfaces at an atomic level.
研究领域:
材料科学
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电化学
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催化
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能量转换
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产品关联
DOI
PubMed
高影响因子
Environmental Science-Advances
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2023
·Vol. 2
·期 3
·495-507
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IF 0
Yong Cheng,Lin Deng,Dan Wang,Xiuxiu Wang,Changchun Ji,Ying-Hua Zhou
In this work, CuS@Cu-CD composites were synthesized and employed as Fenton-like catalysts. CuS significantly enhanced the photodegradation activity of tetracycline (TC) when decorated with Cu-doped-carbon dots (Cu-CDs). The influence of initial pH, dosage of catalyst, and H2O2 concentration on the catalyst performance was investigated. Radical trapping experiments proved that ·O2− and h+ played critical roles and ·OH played a moderate role in the degradation of TC. Mechanism analyses demonstrated that Cu2+/Cu+ redox circulation could be accelerated by the introduction of Cu into carbon dots, which further facilitated H2O2 consumption and resulted in higher TC degradation efficiency.
研究领域:
环境科学
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材料科学
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DOI
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