JOURNAL OF WUHAN UNIVERSITY OF TECHNOLOGY-MATERIALS SCIENCE EDITION
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2023
·Vol. 38
·期 5
·1003-1009
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IF 1.6
Wang Jingjing,Zhang Yawen
Fe 3 O 4 and Cu 2 O were successively immobilized on alkali-treated straw, and the magnetically separable straw@Fe 3 O 4 /Cu 2 O composite was obtained. The straw@Fe 3 O 4 /Cu 2 O was characterized by Fourier transform infrared spectroscopy, X-ray diffraction, scanning electron microscopy, X-ray photoelectron spectroscopy and vibrating sample magnetometry, respectively. Photocatalytic performance of the straw@Fe 3 O 4 /Cu 2 O was evaluated by measuring the degradation of methyl orange (MO) under irradiation of visible light. The introduction of Fe 3 O 4 not only endowed the straw@Fe 3 O 4 /Cu 2 O with magnetic separation feature but also significantly enhanced photocatalytic activity because Fe 3 O 4 could prevent recombination of hole-electron pairs. The active species capture experiment showed that holes (h + ), hydroxyl (·OH) and superoxide (·O 2 − ) radicals all took part in the MO degradation. In addition, the photocatalytic mechanism of straw@Fe 3 O 4 /Cu 2 O was proposed based on the experimental results. After five cycles for the photodegradation of MO, the straw@Fe 3 O 4 /Cu 2 O still displayed good photocatalytic activity, suggesting that the as-prepared composite had great potential for practical use in wastewater treatment.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2021
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IF 5.316
Qi Zhou,Na Yang,Luhong Zhang,Longfei Zhang,Jingshuai Li,Xiaodong Yang,Feifei Peng,Yongli Sun
Application of the super-wettability material is one of the most ideal approaches to achieve oil/water separation. The construction of the super-wettability material surface is the key to significantly boost the separation efficiency. In this work, the ZnO@Cu 2 O honeycomb-likes hierarchical micro/nano-structure copper mesh (ZnO@Cu 2 O/CM) is facilely fabricated through the combination of oxidation and hydrothermal deposition. Accordingly, superhydrophilicity/underwater superoleophobicity can be achieved, which endows over 99% separation efficiency as well as considerable permeation flux (>38120 L∙m −2 ∙h −1 ) for ZnO@Cu 2 O/CM toward various oil/water mixtures. Besides, the combination of ZnO and Cu 2 O produces a p-n heterostructure to further reduce the recombination rate of electron and hole, resulting in the improved the photocatalytic activity. The removal efficiency for methylene blue (MB) of ZnO@Cu 2 O/CM could be improved to 98.1%, nearly 1.6 times than that of Cu 2 O/CM. Various stability tests demonstrate that the material exhibits good mechanical stability , anti-corrosive property and thermal durability under harsh environments. Furthermore, cyclic experiments reveal that ZnO@Cu 2 O/CM exhibits fascinating reusability . In conclusion, the as-synthesized dual-functional mesh performs favorable photocatalytic activity and super-wettability, which can realize wastewater remediation at low cost and energy consumption.
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NANO
·
2013
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IF 1.167
SHIYONG BAO,HAN ZHU,PAN WANG,MEILING ZOU,MINGLIANG DU,MING ZHANG
A facile and green route was introduced to synthesize Pt nanoparticles (PtNPs) immobilized on Cu 2 O octahedrons to form Cu 2 O – Pt hierarchical heterostructure. Transmission electron microscopy (TEM), field emission scanning electron microscopy (FE-SEM), high resolution transmission electron microscopy (HRTEM), X-ray photoelectron spectroscopy (XPS) and X-ray diffraction (XRD) were employed to study their morphology, chemical and crystallographic properties of the Cu 2 O – Pt hierarchical heterostructure. These novel Cu 2 O – Pt hierarchical heterostructures show fascinating degradations of methylene blue (MB), due to the suppressed electron/hole recombination phenomena and the efficient ability to capture the light.
研究领域:
材料科学
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纳米技术
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环境化学
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光催化
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SENSORS AND ACTUATORS B-CHEMICAL
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2017
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IF 5.401
Jian Lv,Chuncai Kong,Yun Xu,Zhimao Yang,Xiaojing Zhang,Shengchun Yang,Ge Meng,Jinglei Bi,Jianhui Li,Sen Yang
Design and synthesis of binder-free electrodes with active nanomaterials on the surface are expected to enhance electrochemical properties. In the work, a novel thin film formed by assembled CuO nanosheets and ultra-thin Cu 2 O film directly adhered on copper foil was obtained by just simply oxidizing the Cu foil using H 2 O 2 . The obtained product on Cu foil consists of a film assembled by CuO/Cu 2 O nanosheets. The ultrathin CuO nanosheets with large surface area provide adequate active sites for the electrocatalysis and the strong binding will promote the electron transfer between active nanomaterials and Cu substrate. The electrochemical performance shows that this novel structure as an electrode exhibits excellent properties for the non-enzyme glucose sensor, with an ultrahigh sensitivity of 1.541 mA mM −1 cm −2 , a low detection limit of 0.57 μM and the linear range is up to 4 mM. Good stability and high selectivity were also obtained by using CuO/Cu 2 O nanosheets@Cu as a nonenzymatic glucose sensor, and furthermore, the electrode shows powerful reliability for analyzing human serum samples. Therefore, the CuO/Cu 2 O film based on Cu foil binder-free electrode may become a promising nonenzymatic glucose sensor and the work also provides a strategy for the design of electrochemical electrode.
研究领域:
生物医学工程
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纳米医学
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电化学传感
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糖尿病监测
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转化医学
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2025
·
IF 9.7
Ke Yin,You Yang,Ming Xu,Lei Li,Yuhang Li,Jiaqi Dai,Weiwei Cao,Tianhui Wu,Jianmin Gu,Desong Wang
p-Cu 2 O is one of the most promising p-type semiconductor photocatalysts for the conversion of solar energy into chemical energy. However, the thermodynamically and kinetically permissible self-oxidation reaction of p-Cu 2 O leads to its low photostability, which remains a bottleneck for its practical application in photocatalysis. Herein, we have simultaneously inhibited thermodynamic and kinetic photocorrosion of p-Cu 2 O via constructing an amorphous hole-transfer conformal interface, which can maintain 91 % photocatalytic degradation efficiency at 6 cycles photodegradation of tetracycline (TC). The significantly improved photostability of the p-Cu 2 O is attributed to the formation of amorphous hole-transfer medium with a conformal shell structure on the surface of p-Cu 2 O, which can inhibit the thermodynamic self-oxidation of p-Cu 2 O by avoiding the contact between the photocatalyst and the electrolyte, and kinetically inhibit photocorrosion of p-Cu 2 O via accelerating hole transfer. These results should provide a fundamental solution to the photocorrosion of the photocatalysts, and open new opportunities for the design and development of photostable catalytic system.
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FUEL
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2019
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IF 5.128
Weijie Geng,Wenxiu Li,Lin Liu,Junhai Liu,Liying Liu,Xiangjin Kong
The hydrodeoxygenation of furfural to 2-methylfuran is of great significance for biomass valorization. However, the design of efficient catalysts based on non-noble metals is still a huge challenge for this transformation. In this work, a uniformly dispersed Cu-Cu 2 O/N-RGO nanocomposite was assembled via microwave assisted reduction and ammonia evaporation synthetic strategy. Under the optimum conditions, the yield of 2-methylfuran reached 95.5%, and there was no catalyst deactivation was observed within 5 cycles. The characterization results confirmed that the activity of the catalyst was mainly attributed to the synergistic effects of surface Cu 0 and Cu + species in catalyst, which were originated from partial reduction of CuO species due to the strong interaction between Cu precursors and support. Furthermore, this strong interaction also promised stability of the catalyst which could immobilize copper particles to resist leaching.
研究领域:
化学工程
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催化材料
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CARBON
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2023
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IF 10.9
Yonghui Zhao,Xiaoli Yang,Xiang Meng,Rui Hu,Xiaoliu Duan,Zhengya Gan,Jianjun Ding,Yi Gong,Xingyou Tian
Encapsulation of Cu nanoparticles by carbon chain mail is a promising approach to extend the service endurance. However, the diffusion of oxygen across the surfaces and interfaces of Cu nanoparticles (NPs) may induce obvious changes to their surface compositions, thereby dramatically altering catalytic properties . Here we reported an unanticipated boosting catalytic activity of graphitic chain mail-encapsulated Cu nanocatalysts (1.3- to 6.8-fold enhancement from initial 1.6–13.4 s −1 g −1 to stable 6.6–21.5 s −1 g −1 ) for the reduction of 4-nitrophenol by simply immersing these NPs in water for 10 days without any further treatment. The graphitic shells were arc-converted from sixteen types of biomass residuals and polymeric wastes. The rising catalytic activity was attributed to the temporal formation of Cu 2 O at the interface of Cu core and graphite shell, which was derived from the diffusion of dissolved oxygen across the defective graphitic chain mail. The increment of catalytic activity was linearly related with the rising content of Cu 2 O. The monotonous relations of initial and enhanced activities with shell thickness and interfacial composition of NPs were also well established. This work provides a new insight into the interfacial manipulation of core/shell nanocatalysts, and paves a versatile path for the high value-added utilization of carbon wastes.
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Journal of Environmental Sciences
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2023
·
IF 6.9
Xiuying Liu,Qianna Xia,Jiao Zhou,Bowen Li,Shuaiqi Zhao,Long Chen,Aimal Khan,Xiaoxia Li,Aihua Xu
The design of efficient heterogeneous catalysts in bicarbonate-activated hydrogen peroxide systems (BAP) is a hot topic in wastewater treatment. In this work, Cu 2 O nanoparticles with different morphologies including cubic shape (c-Cu 2 O), octahedron shape (o-Cu 2 O) and spherical shape (s-Cu 2 O), were applied in BAP for the first time to degrade tetracycline hydrochloride (TC). Compared with Cu 2+ ions and CuO, TC degradation was boosted in the presence of Cu 2 O in the BAP system, with the degradation rate following the order c-Cu 2 O > o-Cu 2 O > s-Cu 2 O. The morphology-dependent effects could be linearly correlated with the ratio of surface oxygen species (O S ), but not with the surface area or Cu(I) ratio. The c-Cu 2 O catalyst with exposure of (100) facets contained 76.6% O S as the active site for H 2 O 2 adsorption and activation, while the value was much lower for o-Cu 2 O and s-Cu 2 O with dominant (111) facets. The presence of HCO 3 − enhanced the interactions among Cu 2 O, H 2 O 2 and TC, leading to facile oxidation of Cu(I) to Cu(II) by H 2 O 2 , and the formation of various reactive species such as hydroxyl radicals and Cu(III) contributed to TC degradation. This work provides a new method for enhancing H 2 O 2 activation with heterogeneous catalysts by crystal facet engineering.
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Journal of Environmental Chemical Engineering
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2023
·
IF 7.7
Haopeng Jiang,Mengyang Xu,Xiaoxue Zhao,Huiqin Wang,Pengwei Huo
The electron density on the catalyst surface has a great influence on the multi-electron transport process of photocatalytic reduction of CO 2 . In this work, hierarchical Cu 2 O/Ni-MOF composite photocatalyst with local surface plasmon resonance (SPR) properties was prepared by simple hydrothermal and water bath methods. Through DRS, XPS and AES tests found that the SPR of Cu 0 expanded the light absorption , provided hot electrons for the reaction system, and greatly improved the photocatalytic activity in coordination with the hierarchical structure and heterostructure. In the absence of sacrificial agent, the CO yield of 30%-Cu 2 O/Ni-MOF was 4.1 times of Cu 2 O (5.32 μmol/g) and 11.1 times of Ni-MOF (1.95 μmol/g), respectively. Then, the possible photocatalytic reaction path was simply speculated based on in-situ FT-IR. In conclusion, the hierarchical structure, heterostructure and SPR effect accelerate the kinetics of Cu 2 O/Ni-MOF photocatalytic reaction, thus improving its photocatalytic activity.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2022
·
IF 9.136
Xinxin Yuan,Zhiling Huang,Jinhua Li,Yue Meng,Zhenhai Gu,Bo Xie,Zheming Ni,Shengjie Xia
The steric effect caused by the lattice mismatch between the two phases hinders the separation and transfer of photogenerated carriers, which is one of the important factors limiting the activity of heterojunction photocatalysts. In this paper, semi - coherent interface Cu2O/Cu7S4 heterojunction was successfully constructed based on the epitaxy growth method of anion exchange. The degradation of tetracycline by semi - coherent interface Cu 2 O/Cu 7 S 4 -30 heterojunction under simulated visible light reached 95.3 % at 60 min, which is a significant improvement compared with single-phase catalysts and ordinary heterojunction catalysts (Cu 2 O/Cu 7 S 4 -mix). The experimental characterization and theoretical calculations confirmed the existence of unique S-Cu-O chemical bonds in the semi - coherent interface Cu 2 O/Cu 7 S 4 heterojunction. On the basis of heterojunction energy band bending and the formation of built-in electric fields, the S-Cu-O bonds can act as a specific bridge to further facilitate the separation, transfer and delivery of photoelectrons and holes, which contributes to the generation of more oxidatively active species (mainly superoxide radicals and holes). In addition, based on experimental characterization and theoretical calculations, the intermediates, degradation pathways and photodegradation mechanisms of the degradation process have also been discussed in detail.
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Advanced Science
·
2023
·
IF 15.1
Jia Huang,Guiming Deng,Shuya Wang,Tianjiao Zhao,Qiaohui Chen,Yuqi Yang,Yongqi Yang,Jinping Zhang,Yayun Nan,Zhaoqian Liu,Ke Cao,Qiong Huang,Kelong Ai
The fast conversion of hydrogen peroxide (H 2 O 2 ) into reactive oxygen species (ROS) at tumor sites is a promising anticancer strategy by manipulating nanomedicines with near-infrared light in the second region (NIR-II). However, this strategy is greatly compromised by the powerful antioxidant capacity of tumors and the limited ROS generation rate of nanomedicines. This dilemma mainly stems from the lack of an effective synthesis method to support high-density copper-based nanocatalysts on the surface of photothermal nanomaterials. Herein, a multifunctional nanoplatform (MCPQZ) with high–density cuprous (Cu 2 O) supported molybdenum disulfide (MoS 2 ) nanoflowers (MC NFs) is developed for the efficient killing of tumors via a potent ROS storm by an innovative method. Under NIR-II light irradiation, the ROS intensity and maximum reaction velocity ( V max ) produced by MC NFs are 21.6 and 33.8 times that of the non–irradiation group in vitro, which is much higher than most current nanomedicines. Moreover, the strong ROS storm in cancer cells is efficiently formed by MCPQZ (increased by 27.8 times compared to the control), thanks to the fact that MCPQZ effectively pre–weakens the multiple antioxidant systems of cancer cells. This work provides a novel insight to solve the bottleneck of ROS-based cancer therapy.
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ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Jilin Liu,Kai Yu,Qianlong Zhu,Zhiyuan Qiao,Hong Zhang,Jie Jiang
Electroreduction of carbon dioxide (CO2) to C2 products (ethylene and ethanol) using efficient catalysts is a feasible approach to alleviate the climate crisis. Cuprous oxide nanoparticles (Cu2O NPs) are a promising catalyst for C2 production but suffer from inherent selectivity and durability. To address this challenge, a Cu2O NPs-nitrogen-doped carbon nanotube (Cu2O NPs-NCNT) composite was prepared with carbon nanotubes (CNTs), Cu2O NPs, and phthalocyanine (Pc). The results indicate that Cu2O NPs-NCNT has excellent Faradic efficiency of C2 products (77.61%) at −1.1 V vs RHE, which is 103.43% higher than that of Cu2O NPs. In the potentiostatic electrolysis combined with Raman spectroscopy and X-ray photoelectron spectroscopy (XPS) measurements, Cu2O NPs-NCNT exhibited structural and catalytic current stability over 10 h. Finally, density functional theory calculations combined with XPS demonstrated that the NCNT in Cu2O NPs-NCNT can selectively absorb CO2 through specific N–CO2 interactions. Our work provides a unique strategy to promote the selectivity of Cu2O NPs for C2 production by introducing N-doped linear carbon materials to fabricate composite.
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