AICHE JOURNAL
·
2021
·Vol. 67
·期 10
·e17368
·
IF 3.993
Yu-Xia Li,Meng-Meng Jin,Shu Shi,Shi-Chao Qi,Xiao-Qin Liu,Lin-Bing Sun
Cu + -containing materials have great potentials in various applications like adsorptive desulfurization. Nevertheless, their applications are severely obstructed by poor stability of Cu + in air. Here, we first clarify the mechanism of Cu + oxidation by first-principle calculations and demonstrate that moisture accelerates Cu + oxidation dramatically. Then, the microenvironment of Cu 2 O-modified HKUST-1, a typical metal-organic framework, is adjusted from hydrophilic to hydrophobic with polydimethylsiloxane coating (producing Cu 2 O@HK@P). This isolates moisture from pores and enhances the stability of Cu + significantly even under oxygen atmosphere. Cu + in Cu 2 O@HK@P preserves well after exposed to air for 6 months, while Cu 2 O@HK lose almost all Cu + for 2 weeks. The optimal Cu 2 O@HK@P can remove 540 μmol g −1 of thiophene from hydrous fuel, which is much superior to Cu 2 O@HK (227 μmol g −1 ) and most reported adsorbents. Our strategy can also be applied to stabilize Cu + in various materials including zeolite, mesoporous silica, and activated carbon.
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DOI
高影响因子
Materials Today Physics
·
2022
·
IF 11.021
X. Li,Z. Wang,J. Zhang,K. Dai,K. Fan,G. Dawson
The solar driven reduction of carbon dioxide (CO 2 ) to high value-added carbon based fuel is a promising solution to mitidate climate and energy problems, however, improving the adsorption and conversion efficiency of CO 2 in the photoreduction process still faces severe challenges. In this work, Cd 0·7 Zn 0·3 Se solid solution was prepared by cation exchange: selenium (Se) vacancies are produced during ion exchange, which promotes the unsaturated coordination of the surrounding metal atoms. The adsorption of diethylenetriamine (DETA) on the surface limits the growth of Cd x Zn 1- x Se crystallites , resulting in insufficient coordination of the surface atoms, which then become active adsorption sites. Furthermore, a heterojunction was formed with Cu 2 O@Cu to accelerate the separation and transfer of photo-induced carriers of Cd 0·7 Zn 0·3 Se, and the optimized Cd 0·7 Zn 0·3 Se/Cu 2 O@Cu (CZS/CC) step-scheme heterojunction exhibited a CO release activity of 50.5 μmol g −1 h −1 , which is 3.8 and 10.7 times higher than that of Cd 0·7 Zn 0·3 Se and Cu 2 O@Cu, respectively. This work is expected to open up new insight for the regulation of nanostructures and the design of selective catalysts.
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高影响因子
ChemNanoMat
·
2021
·Vol. 7
·期 11
·1213-1220
·
IF 3.154
Yang Liu,Yong Zhao,Yulong Zhao,Peng Jiang
Graphical We report an efficient and robust Cu-decorated Rh/TiO 2 catalyst that improves the styrene selectivity in selective hydrogenation of phenylacetylene. The appropriate Cu coverage is found to modulate the electronic states of surface Rh atoms and changes the Rh exposed active sites, thus mitigating the overhydrogenation and enhancing the selectivity. Phenylacetylene as an impurity in styrene is poisonous to catalysts for styrene polymerization in the production of polystyrene plastics. The selective hydrogenation of phenylacetylene to styrene is an industrially promising route to overcome this challenge yet lacks cost-effective catalysts to prevent the overhydrogenation of styrene to ethylbenzene. In this work, we report an efficient and robust copper-decorated Rh/TiO 2 catalyst for the selective hydrogenation of phenylacetylene to styrene. By optimizing the copper coverage on TiO 2 supported Rh nanoparticles, we achieved a selectivity of 83% towards styrene formation at a phenylacetylene conversion of 93%. The appropriate Cu coverage is found to modulate the electronic states of surface Rh atoms and changes the Rh exposed active sites, weakening the binding strength of alkene and hydrogen intermediates on Rh and thus mitigating the overhydrogenation and enhancing the selectivity for styrene generation. This work offers insights on the rational design of efficient Rh-based bimetallic catalysts for selective hydrogenation of phenylacetylene to styrene.
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高影响因子
Nanoscale
·
2019
·Vol. 12
·期 3
·1811-1816
·
IF 6.97
Yongqin Liu,Liang Huang,Xinyang Zhu,Youxing Fang,Shaojun Dong
The electrochemical nitrogen reduction reaction (NRR) under ambient conditions is currently attracting intense attention, but it still remains a great challenge to develop highly selective and active NRR electrocatalysts. Inspired by the intrinsic NRR activity of Au, we systematically studied the synergistic enhanced effect of incorporating other transition metals into Au on its NRR activity. A general strategy was used to synthesize a series of Au-based bimetallic nanocatalysts (AuCu, AuAg, AuPd and AuRu), and the NRR catalytic performance of the as-obtained electrocatalysts was investigated in detail. The experimental results indicate that the positive effect of Cu on NRR was the most remarkable in comparison with that of Ag, Ru and Pd, which can be ascribed to the synergy of the Au and Cu components via modulating the electronic structure and further changing the binding affinity of adsorbed N atoms on the catalyst. Finally, the optimized nanocatalyst with the atom ratio of Au1Cu1 achieved the highest faradaic efficiency (54.96%) and ammonia yield rate (154.91 μg h−1 mgcat−1) at −0.2 V vs. RHE, exceeding those of the previously reported Au nanocatalysts.
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高影响因子
JOURNAL OF ELECTRONIC MATERIALS
·
2022
·Vol. 51
·期 4
·1752-1758
·
IF 2.047
Tian Wenjing,Ding Xu,Jiang Feifei,Du Xinrui,Shi Jipeng,Zhang Ji
Research into metal nanoparticles has increased, and they have been increasingly used in non-enzymatic sensor applications. However, there have been few reports on the use of natural products to prepare non-precious metal nanoparticles in an eco-friendly (green) manner. Studies were conducted on Cu nanoparticles (Cu NPs) prepared by the use of natural gallic acid (GA). This method is environmentally friendly and can be applied to H 2 O 2 detection. As-obtained Cu NPs were characterized by x-ray photoelectron spectroscopy (XPS), powder x-ray diffraction (XRD), and transmission electron microscopy (TEM). When applied to H 2 O 2 detection, Cu NPs had good sensitivity, stability, and anti-interference properties. Its electrochemical performance is no less than that of precious metal nanomaterials. Cu NPs mainly exhibit good sensitivity, reaching 5.74 μA mM -1 cm -2 ; the concentration range thereof is 1–20 mM. The process of constructing nanoparticles in this work used natural products, making it environmentally friendly and proving the practicality of constructing non-precious metal nanoparticles and the feasibility of their application to H 2 O 2 detection. Graphic Abstract
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高影响因子
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
·
2019
·
IF 4.384
Wenying Guo,Sihai Zhang,Nengwu Zhu,Deliang Luo,Pingxiao Wu
In this study, a strategy was developed to directly recover high-purity Ag and other metals (especially Cu) from WECs to reduce the leaching of precious metals and promote the leaching of Cu and other metals. The results of SEM, EDS, XRD and ICP-OES clearly suggested that Ag and Cu were effectively released from WECs below 0.15 mm size, which contributed to the regulation of metals crystal types. The zero-valent copper from WECs was changed by roasting to form CuO and Cu 2 O, and the suitable samples of roasting at 400 °C for 3 h were confirmed experimentally. After the leaching processing under H 2 SO 4 (1 M) and H 2 O 2 (30%), the roasted particles were directly obtained, including Ag with 99.53 wt.% purity and more than 99.99% recovered, and Cu, Sn, Ni and Zn extracted by 99.67%, 90.71%, 73.05% and 99.32%, respectively. However, the unroasted particles would generate lower grade of Ag because other metals (e.g. Cu, Sn, Ni and Zn) were difficult to be leached from WECs. The leaching solution primarily included Cu ions (98.3%) and a little of the nickel (0.83%) and tin (0.86%) ions, which could recover copper by evaporation crystallization to form CuSO 4 (99.48 wt. %). The reaction mechanism of the process could be concluded that the copper state was transformed by mechanical separation and roasting to promote the leaching of various metals from Ag.
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高影响因子
ACS Catalysis
·
2021
·
IF 13.084
Huiyuan Cheng,Xuemei Wu,Manman Feng,Xiangcun Li,Guangping Lei,Zihao Fan,Dongwei Pan,Fujun Cui,Gaohong He
Developing diatomic catalysts (DACs) for the CO2 reduction reaction (CO2RR) has emerged as a promising leading-edge research area owing to their maximum atomic utility and more sophisticated functionalities. However, the proper design of DACs at an atomic level and an understanding of the synergistic mechanism of binary sites remain challenging. Herein, an N-rich carbon matrix with precisely controlled Ni/Cu dual sites is synthesized through the assistance of metal–organic frameworks. The as-prepared catalyst presents high CO Faradaic efficiency of over 95% from −0.39 to −1.09 V vs reversible hydrogen electrode (RHE) with the maximum value of 99.2% at −0.79 V vs RHE and long-term durability of 60 h electrolysis. Density functional theory studies reveal that the electronic redistribution and band gap narrowing induced by the adjacent NiN4 and CuN4 moieties enhance the electron conductivity and strengthen the bonding interactions between *COOH intermediates and Ni centers, thus lowering the overall reaction barriers and promoting CO generation.
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高影响因子
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2023
·Vol. 333
·期 1
·545-556
·
IF 1.6
Tang Haoming,Zhang Mingzhu,Ran Fengya,Sun Shiyong,Golubev Yevgeny Aleksandrovich,Zhao Qian,Lin Sen,Duan Tao,Kotova Olga Borisovna
The Cu 2 O/Cu modified shungite (ShC) absorbent (Cu 2 O/Cu-ShC) was synthesized by hydrothermal method, benefiting from the mineral backbone and Cu 2 O/Cu particles, Cu 2 O/Cu-ShC can remove ~ 96% of I − within 60 min, the batch experiments showed that the I − adsorption process follows pseudo-second-order model and Langmuir model with maximum adsorption capacity of 10.99 mg/g. The high binding affinity between Cu + and I − contributes effective removal of I − and excellent selectivity at high concentrations of competing ions. This work highlights the feasibility of Cu 2 O/Cu-ShC for the radioactive iodine separation, and provides a promising sorbent material for large-scale purification of radioactive iodine anions in wastewater.
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高影响因子
CHEMISTRY-A EUROPEAN JOURNAL
·
2025
·
IF 3.7
Mengtian Lu,Tianye Zhang,Yue Yang,Xin Lin,Jin Huang,Yuan Sun,Tiedong Sun
Graphical The study innovatively combines etched/stripped monolayer Ti 3 C 2 MXene with Cu (2- x ) Se nanoparticles in a one-pot method. The synthesized Ti 3 C 2 /Cu (2- x ) Se nanocomposite has catalase (CAT) and peroxidase (POD) -like activities combined with the excellent photothermal properties of MXene, which enhances the catalytic performance of Cu (2- x ) Se under near infrared (NIR) irradiation, and realizes the synergic photothermal catalytic treatment. Traditional tumor treatments (surgery, radiotherapy, chemotherapy, etc.) have certain limitations and can have serious negative effects, such as difficulty in cutting out tumors, damage to normal tissues, and complications. Ordinary nanozymes have low catalytic activity and require higher doses for treatment, which can increase in vivo toxicity and side effects. To address these limitations, we developed a Ti 3 C 2 MXene-based nanocomposite (Ti 3 C 2 /Cu (2- x ) Se) integrating Cu (2- x ) Se nanozymes with dual enzyme-mimicking activities (catalase and peroxidase) and MXene's photothermal properties. The Cu (2- x ) Se component catalyzes the decomposition of tumor-overexpressed H 2 O 2 into O 2 and cytotoxic ·OH, alleviating hypoxia while inducing oxidative stress. Simultaneously, MXene's high surface area and photothermal capability enhance nanozyme stability, biocompatibility, and catalytic efficiency under near-infrared irradiation. Notably, the photothermal effect amplifies enzymatic activity, enabling synergistic nanocatalytic-photothermal therapy. This synergy not only degrades glutathione to suppress tumor antioxidant defenses but also achieves targeted tumor ablation with reduced dosage requirements. Our work highlights a rational design of MXene-based nanozymes for enhanced multimodal tumor therapy, offering a paradigm for nanocomposite-driven disease treatment.
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PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Xia Wei,Tianyao Wang,Hongbin Dai,Song Li
The hydrazine oxidation reaction (HzOR) plays a critical role in direct hydrazine fuel cells and presents a promising alternative to the kinetics-sluggish oxygen evolution reaction in water reduction. Engineering catalysts with high-density multifold nanotwin structures has emerged as a compelling strategy to enhance catalytic activity. However, the exploration of multifold nanotwins for HzOR applications remains absent. Herein, we report the successful synthesis of a porous Ni-Zn-Cu catalyst featuring high-density twofold and fivefold nanotwins. The Ni-Zn-Cu catalyst supported on Ni foam (Ni-Zn-Cu/Ni foam) exhibits exceptionally high catalytic activity and stability toward the HzOR, achieving a current density of 204.3 mA cm −2 at 0.0 V vs. RHE and retaining up to 89.1 % after 20 h of continuous electrolysis. Online mass spectrometer (MS) analysis indicates that the Ni-Zn-Cu coating facilitates N N bond cleavage of N 2 H 4 . This study offers valuable insights into the development of multifold nanotwin catalysts for advancing HzOR applications.
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高影响因子
Cell Reports Physical Science
·
2024
·
IF 7.9
Xiangxue Zhang,Nina Fei,Keng Sang,Wenyao Chen,Gang Qian,Jing Zhang,De Chen,Xinggui Zhou,Xuezhi Duan,Weikang Yuan
Support effects play a pivotal role in most heterogeneous catalysts, and understanding the underlying catalytic mechanism is crucial for guiding catalyst design and optimizing performance. In this study, we conduct a kinetics and mechanistic investigation into the support effects of Cu catalysts in hydrogen combustion by comparing reducible and nonreducible supports. Multiple characterization techniques are employed to comprehend the support effects, with the reducible support and low-valence Cu species highlighted for the most active Cu/ZrO 2 catalyst. A redox-based kinetics strategy is further proposed by decoupling the reduction step and oxidation step. The as-obtained reduction and oxidation rate diagram indicates a significantly enhanced reduction rate for the reducible supported catalyst, attributed to the abundant surface oxygen vacancy for the generation of hydroxyl intermediates. These efforts aim to develop more efficient kinetics-based techniques for unraveling the nature of support effects, thereby offering a rational approach to designing highly active catalysts.
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高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2022
·Vol. 57
·期 24
·11013-11025
·
IF 4.682
Luo Guoqiang,Li Peibo,Hu Jianian,Guo Jingwei,Sun Yi,Shen Qiang
The purpose of this paper was to design an Al–Cu–Ag–C material system to address the deterioration of mechanical properties caused by intermetallic compounds generated during Al–Cu sintering. The in situ pyrolytic C layer was encapsulated on the surface of the raw material particles, which prevented Al–Cu diffusion and reduced the generation of intermetallic compounds. The microstructure of the Al–Cu–Ag–C composites illustrates that several alloy phases of Al 2 Cu, Al 4 Cu 9 , and Ag 2 Al are formed. The addition of Ag significantly improved the mechanical properties of the composite due to the formation of the Ag 2 Al phase and Cu–Ag solution. The tensile strength and compressive strength of Al–52Cu–3Ag–C are increased by 123.9% and 64.9% over Al–52Cu–C, and the strain is also considerably improved. The strength enhancement derived from the Orowan strengthening contributed by Ag 2 Al, and the solid solution strengthening contributed by Ag–Cu solid solution, respectively. The presence of Ag 2 Al also enhances the hardness of the composite.
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高影响因子
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