CARBON
·
2019
·
IF 7.466
Hao Ying,Weiwei Wang,Wenyu Liu,Le Wang,Shanshan Chen
Layer-by-layer synthesis of graphene films has been of considerable interest for the precise layer engineering. However, the additional graphene layer typically forms on the Cu surface but underneath the existing graphene layer, limited by the catalytic substrate mediated growth mechanism. This work introduces a reliable cobalt (Co) nano-powders (NP) assisted technique to synthesis the bilayer graphene (BLG) and multilayer graphene (MLG) layer-by-layer on Cu foil in one-step. With nanostructure and high-surface-area, the Co NP demonstrates much higher catalytic activity to provide long-lasting catalytic activity during the graphene growth. The growth of the BLG activated by the Co NP solely has been observed with the growth rate exceeding the Cu-catalyzed single layer graphene (SLG), which validates the superiority of the homo-epitaxial growth. Fully covered uniform Bernal-stacked BLG and high coverage tri-layer graphene are successfully achieved on Cu foils through the optimal growth conditions. This work creates a pathway toward effective production of BLG/MLG via layer-by-layer mode. The utilizing of the NP catalyst may serve as a more general technique for the one-step synthesis of other hybrid heterostucture.
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RSC Advances
·
2015
·Vol. 5
·期 96
·79022-79030
·
IF 3.84
Lei Xu,Xiaoqiong Lu,Xiaomin Cheng
A series of novel cotton cellulose-graft-polycaprolactone copolymers with different grafting contents were successfully prepared via ring-opening polymerization (ROP) in an ionic liquid 1-N-butyl-3-methylimidazolium chloride ([Bmim]Cl). The structures of the grafting copolymers were systematically characterized by FTIR, CP/MAS13C-NMR, XRD, SEM and AFM, while thermal properties were investigated by DSC and TGA. Subsequently, Langmuir, Freundlich, Temkin, and Dubinin–Radushkevich (D–R) adsorption isotherms were representative to simulate adsorption isotherms of Cu(II) and Ni(II) ions in aqueous solution. From the comparison of different adsorption isotherm models, it was found that adsorption of Cu(II) by modified cellulose followed Langmuir, Freundlich and Temkin models, while that of Ni(II) followed the Freundlich model. The results of adsorption indicated that the selectivity sequence of metal ions on graft copolymers was Cu(II) > Ni(II) and the maximum removal capacities of Cu(II) and Ni(II) ions were 98.7% and 35.6%, respectively. Hence, the graft copolymers exhibited significant potential to be an environmentally feasible biosorbent for removal of Cu(II) and Ni(II) ions from aqueous solution.
研究领域:
环境科学
·
高分子化学
·
材料科学
·
重金属去除
·
吸附技术
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2026
·
IF 21.1
Donglei Fu,Wei Zhang,Zhengxiong Zhao,Zhonglin Chen,Pengwei Yan,Jinxiang Zuo,Lianpeng Sun
Element-doped catalysts with oxygen vacancies (OVs) are highly effective in water purification by activating oxidants; however, the interfacial mechanisms and specific contributions of reactive oxygen species (ROS) in metal-doped catalysts featuring OVs for peroxymonosulfate (PMS) activation remain insufficiently elucidated. In this study, Cu-doped NiFe 2 O 4 catalysts with abundant OVs were synthesized via a hydrothermal-calcination process, endowing efficient PMS activation for ROS generation. Remarkably, it mediated more sulfate radicals (SO 4 · − ) and hydroxyl radicals (·OH) generation, accounting for 50.4% and 36.5% of 2,4-dichlorophenoxyacetic acid (2,4-D) degradation, respectively. Benefiting from the formation of OVs, it significantly enhanced PMS adsorption ( E ads = -7.17 eV), markedly lower than that of the pristine NiFe 2 O 4 ( E ads = -4.11 eV). Meanwhile, inducing the regulation of the d-band center of Fe and Ni sites towards the Fermi level, thereby enhancing more electron transfer (0.84 e of NiCu x Fe 2-x O 4 compared to 0.60 e of NiFe 2 O 4 ) from OVs to surface-complexed PMS, and thus voluntarily forming SO 4 · − with lower free energy (△G = -11.7 eV). This work elucidates the OVs-mediated structural regulation of the d-band center and interfacial electron transfer pathway, highlighting a synergistic multi-metal activation mechanism in response to PMS activation, which offers a novel strategy for designing efficient catalysts to trigger interfacial ROS formation.
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JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
·
2026
·
IF 6.2
Zong-Pin Fu,Yun-Peng Zhao,Yu-Fa Wu,Qi-Jie Zhou,Shu-Ting Hu,Le-Le Qiu,Fang-Jing Liu,Mei Zhong,Jing Liang,Jing-Pei Cao
Mild thermal dissolution is an effective method for the clean, low-carbon conversion of lignite. However, the resulting products still contain numerous oxygen-bridged bonds and heavy molecular compounds, requiring further upgrading to serve as suitable feedstocks for fuels and chemicals. In this study, a supported Cu-Ni bimetallic catalyst was synthesized via a co-precipitation method and applied to the catalytic hydroconversion (CHC) of thermal dissolution portions from Zhaotong lignite (ZT) and lignite-related model compounds (LRMCs). Catalyst characterization revealed that metal particles were uniformly dispersed on the surface of the Cu-Ni/CoOx-CeO 2 catalyst, along with the formation of defect sites. The CoOx-CeO 2 support promoted surface oxygen vacancy formation. Furthermore, the incorporation of Ni altered the local coordination environment of Cu species through multicomponent interactions. The synergy between interfacial oxygen vacancies and Cu-Ni bimetallic sites significantly enhanced catalytic activity. Tests with LRMCs indicated that the Cu-Ni/CoOx-CeO 2 catalyst selectively cleaves C-O ether bonds under mild conditions, exhibiting both high selectivity and strong hydrogenation activity in the CHC of phenolic compounds. The catalyst also effectively promoted the CHC of macromolecular species in the soluble portion from ZT thermal dissolution, thereby converting phenolic compounds into cycloalkanol. These finding provides valuable insights for developing staged conversion routes and achieving value-added utilization of lignite.
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POLYHEDRON
·
2026
·
IF 2.8
Nan Wang,Lei Chen,Wanhe Du,Keying Zhu,Bingyu Zhang,Shengwen Chen,Zhiguo Sun,Jifen Wang
A novel Z -scheme CuWO 4 /Cu/Cu 2 O ternary heterojunction photocatalyst was successfully synthesized via a solvothermal approach, featuring the low-cost metallic copper (Cu) as an efficient electron mediator. This unique structure was designed to enhance Cu 2 O visible light capture capability and accelerate photogenerated charge separation, thereby efficiently degrading the recalcitrant antibiotic Rifampicin (RFP). Comprehensive characterizations (XRD, XPS, SEM, EDS) confirmed the successful construction of the heterojunction, where CuWO 4 and Cu particles are integrated onto the surface of the Cu 2 O. Compared to individual components and binary composites, the optimized CuWO 4 /Cu/Cu 2 O sample demonstrated significantly superior photocatalytic activity, achieving an impressive 88.0% RFP degradation rate within 80 min under visible light. The enhanced performance is primarily ascribed to the successful formation of a Z -scheme charge transfer pathway, where the localized surface plasmon resonance (LSPR) effect of the metallic Cu mediator promotes carrier migration, thereby improving both carrier separation efficiency and redox capacity. Kinetic analysis confirmed a degradation rate constant ( k ) of 0.02743 min −1 , approximately 2.8 times higher than that of pure Cu 2 O. Furthermore, the composite exhibited excellent stability, maintaining a degradation rate above 80% after five recycling runs and demonstrating robust performance across a broad pH range (3.0–7.0). Based on active species trapping and band structure analysis, a Z -scheme mechanism was proposed, highlighting O 2 − as the dominant active species. This study provides a facile and low-cost strategy for constructing highly efficient LSPR-enhanced Z -scheme photocatalysts for environmental remediation.
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JOURNAL OF HAZARDOUS MATERIALS
·
2026
·
IF 10.6
Zhe Xu,Weilan Zhen,Chengfeng Liu,Jiantong Zhou,Taicheng An
The speciation compatibility of Cu-ligand complexes and catalytic oxidation systems fundamentally governs their decomplexation efficiency, exhibiting pronounced ligand concentration dependence. While contemporary methodologies predominantly focus on stoichiometric Cu(II)-ligand complexes, their efficacy in treating wastewater with ligand excess remains technologically contentious. This study demonstrates the Mn(II)/peroxymonosulfate (PMS) process as a robust solution for the elimination of Cu(II)-ligand complexes even in excessive ligand environments. Using Cu(II)-EDTA as the representative complex, 90% decomplexation was achieved within 1 and 5 min at [EDTA] 0 :[Cu] ratios of 1:1 and 2:1, respectively, surpassing reported decomplexation approaches such as UV/H 2 O 2 , UV/peroxydisulfate (PDS), and Co 2+ /PMS. Mechanistic investigations through oxidation species characterization and product analysis revealed a successive decarboxylation of EDTA by non-radical pathway, i.e., high valence metals and singlet oxygen, enhancing process selectivity while minimizing oxidant consumption ([PMS] 0 :[EDTA] 0 = 30:1). The system exhibits dual mechanistic regimes: (i) instantaneous decomplexation under ligand-deficient conditions via PMS activation by in-situ formed CuO through alkaline precipitation, and (ii) cascade decomplexation for ligand-rich systems involving Mn-Cu synergistic destruction of excessive EDTA prior to CuO-catalyzed degradation of residual ligand. Such synergism is believed to stem from the electron transfer from Cu(II) to Mn(V/VI), forming reactive Cu(III) for decomplexation through intramolecular electron transfer. The Mn(II)/PMS system also exhibited the applicability in treating various Cu(II)-ligand complexes and real wastewater. This work establishes a practical strategy for reliable treatment of industrial wastewater containing non-stoichiometric Cu-ligand complexes.
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BIOSENSORS & BIOELECTRONICS
·
2026
·
IF 11.8
Xiaodi Niu,Xinyan Wang,Ning Huo,Hongsu Wang
Mimicking the sophisticated oxidative machinery of natural monooxygenases for high-performance biosensing remains a grand challenge, primarily due to the elusive control over positive charge carriers (holes) required for efficient signal amplification. Here, we report an atomically precise Fe-Cu heteronuclear diatomic catalyst (Fe-Cu-HDC) that unlocks unprecedented analytical sensitivity through a novel asymmetric hole-confinement mechanism. Unlike traditional single-atom catalysts where charge carriers are delocalized, the Fe-Cu interface acts as a decisive “hole trap” spatially concentrating reactive charge carriers at the active center. This localized accumulation triggers the formation of potent high-valent iron species and facilitates barrierless oxygen activation, providing the rapid mineralization of >80% tetracycline within 80 min with a superior reaction rate ( V max = 0.27 mM min −1 ). Leveraging this hole-driven enzymatic proficiency, we engineered an integrated 3D-printed platform comprising a continuous-flow filtration reactor and a smartphone-based colorimetric sensor array. This portable device enables the simultaneous rapid mineralization and fingerprint-like discrimination of tetracycline antibiotics in complex real-world matrices (raw milk and livestock wastewater) with a detection limit as low as 30 nM. The platform maintains >90% activity after 18 d of storage and demonstrates laboratory-grade accuracy in raw milk and livestock wastewater. Our findings not only demystify the electronic origin of bio-inspired oxidation but also establish hole-carrier engineering as a transformative dimension for designing the next generation of intelligent, cofactor-free biosensors for on-site diagnostics and environmental surveillance.
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PubMed
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Materials
·
2026
·Vol. 19
·期 13
·2821
·
IF 3.7
Pengcheng Jiang,Huidong Tang,Xin Xiong,Zhi Wu,Wei Zhang,Wenting Wang,Jingdan Yan,Yao Luo,Yong Su,Siqi Zhu,Can Xia,Ziyue Huang,Yue Gong,Zhoufu Wang
Phenolic resin is widely used as a binder in high-temperature industries; however, its pyrolysis generally yields isotropic glassy carbon, which strongly influences its high-temperature oxidation behavior. In this work, cupric tartrate was introduced as a catalyst precursor to investigate its effects on the thermal decomposition behavior, microstructural evolution, and oxidation behavior of the phenolic resin pyrolytic carbon. Upon heating, cupric tartrate decomposed at 250–320 °C into nanoscale Cu/Cu2O composites, which were then converted into metallic Cu nanoparticles through reduction by gaseous products generated during the pyrolysis of phenolic resin. The in situ formed Cu nanoparticles were associated with the growth of tapered carbon nanofibers (CNFs), reaching maximum lengths of 30–50 μm at 700 °C. Based on the observed microstructural features and established literature reports, a dissolution–precipitation pathway is proposed to rationalize the formation of these CNFs. The presence of Cu-catalyzed CNFs correlates with enhanced structural ordering of the pyrolytic carbon, as reflected by reduced ID/IGratios, and with an increased apparent oxidation activation energy in the selected fitting region (from 103.73 to 137.45 kJ/mol). Overall, this work demonstrates a facile strategy in which cupric tartrate serves as an effective catalyst precursor that generates Cu nanoparticles in situ; these nanoparticles then catalyze CNF growth from phenolic resin, enabling the construction of low-dimensional carbon nanostructures.
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Metals
·
2026
·Vol. 16
·期 5
·528
·
IF 3.1
Guangya Hou,Siqi Chen,Jianli Zhang,Qiang Chen,Yiping Tang
The functional valorization of waste fabrics, particularly their conversion into flexible low-cost, high-performance electrodes, holds significant promise for resource sustainability and the development of advanced energy technologies. Here, a NiB/Cu/polyester fabric (PF) composite electrode was fabricated via two-step electroless plating on waste PF and was demonstrated as a bifunctional electrocatalyst for methanol oxidation (MOR) and urea oxidation (UOR). The morphology, crystal structure, surface chemical state, and wettability of the electrodes were characterized using SEM, TEM, XRD, XPS, and contact angle measurements. The Cu interlayer critically enhanced interfacial wettability, intrinsic catalytic activity and stability. At 0.8 V, the NiB/Cu/PF electrode delivered average current densities of 312 mA·cm−2for MOR and 288 mA·cm−2for UOR, outperforming NiB/PF by 27.9% and 9.1%, respectively. After 2000 accelerated degradation cycles with electrolyte renewal, MOR and UOR activities were retained at 91.6% and 105.0%, respectively. Remarkably, the Cu interlayer conferred exceptional mechanical–electrochemical robustness: following 100 sequential bending and twisting deformations, current density retention ranged from 84.6% to 96.7% across multiple test configurations. The Cu interlayer acted as a flexible stress buffer during mechanical deformation, effectively improving the adhesion between the coating and the substrate.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2026
·
IF 9.6
Peng Qian,Shiyu Li,Mingxing Zhu,Ranyun Wu,Chuanhuang Wu,Xiaoyan Zhong,Song Shu,Yahui Yang,Zhiliang Jin,Hui Su
Electrocatalytic nitrate reduction to ammonia is strongly dependent on the availability of active hydrogen (*H). Either insufficient *H supply or excessive *H accumulation at the catalyst surface can compromise ammonia production and Faradaic efficiency. To address this challenge, a RuNP/Cu NC catalyst was developed by constructing N-bridged Ru nanoparticles on a carbon‑nitrogen support anchored by single-atom Cu. In this architecture, Ru nanoparticles generate *H and establish a hydrogen-transfer pathway across the Ru nanoparticles/Cu single atoms interface, thereby promoting nitrate enrichment and subsequent hydrogenation. The RuNP/Cu NC catalyst achieved an NH 3 yield rate of 7.92 mg h −1 cm −2 with a Faradaic efficiency of 97.22%, together with an energy efficiency of 34.31%, far surpassing those of RuNP/NC (9.75%) and Cu NC (13.64%). Operando DRT analysis revealed accelerated interfacial charge-transfer kinetics on RuNP/Cu NC, facilitating hydrogen spillover from Ru sites to adsorbed NO 3 − species on neighboring Cu sites. In situ FTIR spectroscopy captured the key intermediate *NH 2 OH. Theory calculations further showed that the hydrogenation superhighway established at the strong metal-support (MSI) interactions interface lowers the hydrogenation energy barrier of NH 2 OH. This work establishes a hydrogen-regulated reaction pathway and demonstrates the advantages of MSI for efficient ammonia electrosynthesis. The immobilization of Ru nanoparticles on single-atom Cu NC generates interconnected Ru N and Ru Ru interfacial domains that function as rapid *H transfer superhighways across the catalyst surface. Download: Download high-res image (221KB) Download: Download full-size image
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MICROCHEMICAL JOURNAL
·
2026
·
IF 5.2
Chunyan Ren,Guoliang Ding,Mengru Chen,Xiaojun Chen,Gang Peng
Carbon material derived from lotus petiole exhibits enzyme-like activity. • The multiple enzyme-like activities of Cu@C-AuNPs can be switched by pH. • A colorimetric-electrochemical dual-mode aptasensor was successfully constructed. • The sensor provides a detection limit as low as 4.35 × 10 −6 ng mL −1 . • The developed method is suitable for controlling AFB1 in rice. Rapid and reliable detection of aflatoxin B1 (AFB1) is of paramount significance for food safety control and public health protection. Herein, a novel lotus petiole-derived pH-switchable Cu@C-AuNPs nanozyme featuring versatile enzyme-like activities was rationally engineered to fabricate a dual-mode colorimetric-electrochemical aptasensor for the ultrasensitive and selective detection of AFB1. Benefiting from its sharp pH-switchable catalytic behavior, the as-prepared nanozyme displays prominent peroxidase-like activity under acidic conditions (pH 4.0), efficiently catalyzing H 2 O 2 -mediated oxidation of 3,3′,5,5′-tetramethylbenzidine (TMB) to enable visual colorimetric readout; in contrast, it switches to distinct catalase-like activity under neutral conditions (pH 7.4), decomposing H 2 O 2 to generate oxygen and thereby producing quantifiable electrochemical signals. Under optimized experimental parameters, the colorimetric mode exhibits a linear response from 1 × 10 −2 to 1 × 10 3 ng mL −1 with a limit of detection (LOD) of 6.96 × 10 −3 ng mL −1 , whereas the electrochemical mode achieves a broader linear range of 1 × 10 −5 to 1 × 10 3 ng mL −1 with a superior LOD of 4.35 × 10 −6 ng mL −1 . This dual-signal sensing strategy not only furnishes a robust and accurate platform for AFB1 detection but also holds promising application prospects in on-site and laboratory-grade food safety monitoring. A lotus petiole-derived Cu@C-AuNPs nanozyme with pH-switchable activities enables dual-mode detection of aflatoxin B1. At pH 4.0 (colorimetric), peroxidase-like activity oxidizes TMB to oxTMB, giving an absorbance increase (LOD 6.96 × 10 −3 ng mL −1 ). At pH 7.4 (electrochemical), catalase-like activity decomposes H 2 O 2 to O 2 , producing a current decrease (LOD 4.35 × 10 −6 ng mL −1 ). This aptasensor provides reliable cross-validation for food safety monitoring. Download: Download high-res image (177KB) Download: Download full-size image
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LANGMUIR
·
2026
·
IF 4.4
Xing Zhong-Lei,Jiang Run-Yuan,Yang Ting-Yu,Zhang Li-Ping,Lan Hao-Ling,Wang Shao-Min,Yang Qing-Yuan
The close similarity in molecular dimensions and physicochemical
properties between n -butane ( n -C 4 H 10 ) and isobutane (iso-C 4 H 10 ) makes their separation a persistent industrial challenge. In this
work, we employ two copper-based coordination networks, Cu-APC and Cu-MPC , constructed from amino- and methyl-functionalized
pyrimidine-5-carboxylate ligands, respectively, for n -C 4 H 10 /iso-C 4 H 10 separation.
The two frameworks exhibit distinct interlayer channel apertures (5.2
Å for Cu-APC and 4.1 Å for Cu-MPC ), enabling a systematic comparison of pore-chemistry effects on
C4 isomer discrimination. Cu-APC exhibits a remarkable n -C 4 H 10 uptake of 33.6 cm 3 ·g −1 under the conditions of 298 K and 100
kPa, together with an adsorption ratio of 4.36 for an equimolar n -C 4 H 10 /iso-C 4 H 10 mixture. DFT calculations were performed to investigate the host−guest
interactions. The results indicate that n -C 4 H 10 is preferentially stabilized within the 2D framework
via synergistic C−H···π and C−H···N
contacts, with measured distances of 3.42 Å and 3.15−3.68
Å, respectively. Cyclic fixed-bed breakthrough experiments further
confirm the excellent stability and regenerability of Cu-APC , positioning it as a viable candidate for the energy-saving separation
of n -C 4 H 10 from C4 alkane isomers.
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