CARBOHYDRATE POLYMERS
·
2015
·
IF 4.074
Jun Huang,Haihua Xie,Hui Ye,Tian Xie,Yuecheng Lin,Jinyan Gong,Chengjun Jiang,Yuanfeng Wu,Shiwang Liu,Yanli Cui,Jianwei Mao,Lehe Mei
Chitosan was prepared by N -deacetylation of squid pens β-chitin, and N -carboxyethylated chitosan ( N -CECS) with different degrees of substitution (DS) were synthesized. DS values of N -CECS derivatives calculated by 1 H nuclear magnetic resonance (NMR) spectroscopy were 0.60, 1.02 and 1.46, respectively. The adsorption capacity of Cu(II) by N -CECS correlated well with the DS and pH ranging from 3.2 to 5.8. The maximum Cu(II) adsorption capacity ( q m ) of all three N -CECS at pH 5.4 was 207.5 mg g −1 , which was 1.4-fold higher than that of chitosan. The adsorption equilibrium process was better described by the Langmuir than Freundlich isotherm model. Adsorption of Cu(II) ion onto N -CECS followed a pseudo-second order mechanism with chemisorption as the rate-limiting step. In a ternary adsorption system, the adsorption capacity of Cu(II) by N -CECS also presented high values, and q m for Cu(II), Cd(II), and Pb(II) were 150.2, 28.8, and 187.9 mg g −1 , respectively.
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ACS Applied Materials & Interfaces
·
2017
·
IF 7.504
Dengfeng Wu,Wei Zhang,Daojian Cheng
The design and development of low-cost Pt-free, high-active, and durable noble-metal-free electrocatalysts for methanol electrooxidation is highly desirable but remains a challenge. Herein, unique Cu/NiCu nanowires (NWs) integrating alloy, core–shell, and one-dimensional structures are prepared by a facile one-pot strategy. It is found that the Ni–Cu surface alloying structure can effectively change the charge distribution of the atomic configuration, the core–shell structure can be optimized with the usage of Ni and Cu, and the one-dimensional structure can effectively enhance the charge transfer between the electrode surface and the active sites, making the prepared NWs promising electrocatalysts. Detailed catalytic investigations showed that the obtained Cu/NiCu NWs exhibit an enhanced electrocatalytic performance for methanol oxidation reaction (MOR). The optimized Cu/NiCu NWs in this work show a mass current density of 867.1 mA mgmetal–1 at 1.55 V (vs. RHE) for MOR, which is far higher than those of Ni-based previously reported electrocatalysts. This work opens up a new pathway for the design and engineering of noble-metal-free alloy electrocatalysts with enhanced activity and durability.
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RSC Advances
·
2016
·Vol. 6
·期 111
·109386-109393
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IF 3.289
Jian-Jun Shi,Lei Gong,Yan-Hong Zhang,Ping Yang,Jie He
A series of Cu and Mn doped glutathione (GSH)–ZnS polypeptide quantum dots (QDs) were successfully prepared by a facile one-pot microwave-assisted sonochemical synthesis approach. Herein, GSH acted as a sulfide source and dispersant, as well as a reducing agent to form polypeptide QDs. The products were characterized by high-resolution transmission electron microscope (HRTEM) and energy dispersive spectroscopy (EDS). Results show that the size of the polypeptides QDs was 2–3 nm. In Fourier transform infrared (FT-IR) spectra, the splitting of S–H bonds and substitution by S–Zn can be noticed. The bonding interaction between Cu, Mn and Zn ions toward S was further confirmed from X-ray photoelectron spectroscopy (XPS) analysis. The results confirmed the partial Cu(Mn) substitution of Zn. Fluorescence (FL) spectra and UV-vis absorption spectra were used to investigate the optical properties. It was found that the doping of Cu and Mn could decrease the band gap of GSH–ZnS from 3.67 eV to 2.86 eV. The photoelectrochemical (PEC) properties of GSH–ZnS were enhanced due to the doping of Cu and Mn which has excellent chemical stability. The possible photoelectrochemical reaction mechanism is discussed.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2024
·
IF 8.1
Jiajin Li,Minglei Lu,Yuxin Ge,Weiwei Lu,Zidi Liu,Hongde Xu,Yu Zhang,Zhihui Li,Zhuoyu Zheng,Pengxiang Gao,Qian Zhang,Tiejun Wang
Aqueous-phase reforming of methanol (APRM) is an important method for H 2 production, widely used in energy fields like polymer electrolyte membrane fuel cells (PEMFCs). However, traditional noble metal catalysts , being expensive and vulnerable to CO poisoning, restrict their practical application. Therefore, developing robust non-noble metal catalysts for efficient and sustainable H 2 production with low CO levels in APRM at low temperatures is highly significant. In this study, a novel approach was employed to synthesize carbon-encapsulated Cu catalyst via controlled pyrolysis , leading to Cu@CA-Val catalyst with excellent low-temperature catalytic activity. The optimal Cu@CA-Val-300 catalyst exhibited a high hydrogen production rate of 0.2–27.0 μmolH 2 /g cat /s over a wide temperature of 135–180 °C (base-free), surpassing the most Cu-based and Pt-based catalysts. The Cu@CA-Val-300 catalyst exhibited exceptional hydrothermal stability during continuous operation in a fixed reactor for 200 h. Efficient H 2 production was attributed to good wettability , enabling the diffusion of CH 3 OH and H 2 O molecules into Cu + /Cu 0 sites for activation, with CO being suppressed and transformed through the formate formation.
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ACS Applied Nano Materials
·
2024
·
IF 5.3
Yapeng Yao,Xiaodong Gou,Wei Liu,Zihang Liang,Jiangbo Zhang,Zhongliang Ma
Integrating energetic materials into microelectromechanical system (MEMS) to enhance their energy output characteristics has shown extensive potential across aerospace, defense, and civilian applications. Within this study, the MEMS compatible Cu/DNBT (DNBT = [5,5′-dinitro-3,3′-bi(1,2,4-triazole)]) and Cu/DNBT@nano-Al energetic films were successfully synthesized on the copper substrate using an electrochemical method and a drip coating method. The scanning electron microscope (SEM), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), differential thermal analyses (DTA), and a pulse laser ignition test were used to analyze the morphology, composition, thermal performance, and ignition properties of the prepared samples. The findings indicate that the prepared Cu/DNBT and Cu/DNBT@nano-Al energetic films exhibit a nanostructure, and their morphology can be effectively regulated via modifications to the deposition voltage, deposition time, and aluminum plating frequency. Furthermore, the energetic properties of Cu/DNBT@nano-Al films can be adjusted after the deposition of nano-Al. Their heat release, flame height and ignition duration can reach up to 1823.1 J·g–1, 13.5 mm, and 400 μs, respectively. These findings suggest that Cu/DNBT@nano-Al energetic films being a prime contender for initiating powders in MEMS pyrotechnics. In summary, this work offers valuable insights into the integration and application of energetic materials in MEMS ignition devices.
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ENVIRONMENTAL RESEARCH
·
2024
·
IF 7.7
Cuicui Xu,Yue Lv,Xia Qin,Fanbin Zhang,Hongyun Ren,Xujie Lan,Xiyang Li,Xingwei Tao
Landfill leachate nanofiltration concentrates (LLNC) contain complex organic pollutants that are difficult to treat. This study developed a copper-doped attapulgite-chitosan composite catalyst (Cu@ATP-CTS) for efficient LLNC degradation in a Fenton-like system. The incorporation of attapulgite extended the effective pH range of Fenton reactions from 2 to 8, overcoming traditional limitations. Optimized via response surface methodology, the catalyst achieved 89.02% UV 254 removal, 73.86% COD removal, and 77.24% TOC removal within 115 min under optimal conditions. Copper played a crucial role in H₂O₂ activation, cycling between Cu 0 , Cu + , and Cu 2+ to generate hydroxyl radicals (·OH), the key species driving pollutant degradation. The Cu@ATP-CTS catalyst also demonstrated strong stability and reusability over five cycles. This study provides a robust and sustainable method for LLNC treatment, offering significant potential for application in landfill leachate and wastewater management.
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SOLAR ENERGY MATERIALS AND SOLAR CELLS
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2024
·
IF 6.3
Jianbo Ren,Tao Hu,Wenbo Zhang,Li Li,Wenhui Yuan
Photothermal phase change materials (PCM) are employed for the efficient conversion and storage of solar energy. In this work, a Cu-Zn bi-metallic metal-organic framework (MOF) was synthesized and combined with expanded graphite (EG), followed by high-temperature carbonization to prepare the supporting material for polyethylene glycol (PEG). Through the high-temperature carbonization process, nano-metallic copper is uniformly dispersed on the surface of the EG, accompanied by the formation of a new porous structure resulting from the evaporation of Zn vapour. The nano metallic copper particles enhance the thermal conductivity and photo-thermal conversion efficiency of the composite PCM, while the porous structure generated by Zn vapour improves the adsorption capacity of PEG. The composite PCM demonstrated a high phase change enthalpy of 174.6 J/g and excellent thermal reliability, with only a 2.29 % reduction in enthalpy after 200 melting-freezing cycles. Additionally, the thermal conductivity of the composite PCM reached 6.096 W/(m·K) which is 26.1 times higher than that of pure PEG, while the photo-thermal conversion efficiency achieved was 88.69 %. These properties indicate that the PEG/EG/Cu-Zn-MOF derived carbon composite PCM has great potential for applications in solar energy storage and conversion.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2024
·
IF 8.1
Yun Li,Jiaqi Bu,Yirui Sun,Zihan Huang,Xiuhao Zhu,Shang Li,Ping Chen,Yalan Tang,Guowen He,Shian Zhong
In this work, Cu-based metal-organic framework material (Cu-MOF) was combined with an electric field to construct a three-dimensional electrocatalytic synergistic activation of peroxymonosulfate sulfate (PMS) system (3D/Cu-MOF/EC/PMS) for the degradation of norfloxacin (NOR). The results show that the synergistic degradation efficiency of the Cu-MOF material with the electric field is enhanced by nearly 64 % relative to the degradation efficiency of the two alone. The quenching experimental and EPR characterization indicates that ROS plays an important role in the degradation process, with O 2 – playing a dominant role. Finally, the degradation pathway of NOR was explored by DFT study and LC-MS tests, and the toxicity evaluation software (TEST) and CCK-8 cytotoxicity experimental studies demonstrated that the sewage after the degradation of NOR by this system would have little or no effect on human liver cells (L02). This study not only shows that the 3D/Cu-MOF/EC/PMS system can treat the water containing higher concentrations of NOR into a state that is not harmful to the human body but also provides a new idea for the improvement of catalysts that do not have obvious catalytic degradation effects.
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Advanced Composites and Hybrid Materials
·
2024
·Vol. 8
·期 1
·1-19
·
IF 23.2
Ye Fangdie,Ye Chen,Zhao Yufeng,Li Weijian,Zhang Jinhao,Ou Yuxi,Chen Ziang,Cheng Zhang,Zhang Jing,Ali Shujaat,Qureshi Omer Salman,Liu Yufei,Dai Xiangpeng,Huang Hang,Jiang Haowen
Bladder cancer (BLCA), particularly due to the high recurrence and progression rates of non-muscle-invasive bladder cancer (NMIBC), is a significant global health challenge. Current treatments, such as Bacillus Calmette-Guérin (BCG) immunotherapy and intravesical chemotherapy, often cause substantial side effects and exhibit limited efficacy, highlighting the urgent need for novel therapeutic strategies. Single-cell spatial transcriptomic advancements have identified cuproptosis as a critical pathway in BLCA, presenting a promising target for treatment. In this study, these insights were leveraged to design Cu-VT nanoparticles (NPs), an innovative composite material that combines the unique properties of copper ions and the natural flavonoid vitexin, to induce cuproptosis. Cu-VT NPs could effectively induce apoptosis and oxidative stress in BLCA cells concurrently modulating the immune response within the tumor microenvironment. Comprehensive in vitro and in vivo experiments demonstrated that Cu-VT NPs significantly inhibited tumor growth and reduced lung metastasis through cuproptosis induction. This dual-function composite material enhances therapeutic efficacy and minimizes side effects, showcasing its potential as a revolutionary treatment for BLCA. Our findings highlight the transformative potential of Cu-VT NPs in the context of BLCA treatment, establishing a new paradigm in the use of composite materials for the treatment of advanced cancer.
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Journal of Cleaner Production
·
2024
·
IF 9.7
Xiaolu Sun,Linhua Jiang,Ning Duan,Guangbin Zhu,Yanli Xu,Hao Jin,Yong Liu,Rong Zhang
Currently, domestic and foreign copper smelting waste acid mainly employ sulfuration method to realize the separation of Cu(Ⅱ) and As(Ⅲ), facing the problem of unreasonable sulfidizing agent dosage and sulfidation time. If excessive sulfidizing agent dosage or overly long sulfidation time, it will lead to human health threat and large hazardous waste volume. If insufficient sulfidizing agent dosage or overly short sulfidation time, it will cause the waste of copper resources and substandard treatment solution. In this paper, the competitive sulfuration mechanism of Cu(Ⅱ)/As(Ⅲ) solution ( C (As(Ⅲ)) = 10 g/L) with different Cu(Ⅱ) concentrations is revealed, i.e., when C (Cu(Ⅱ)) ≥7 g/L, the sulfidation sequence of Cu(Ⅱ) and As(Ⅲ) follows the solubility product constant (Ksp); when C (Cu(Ⅱ)) ≤6 g/L, the precipitation process of Cu(Ⅱ)/As(Ⅲ) is dominated by the liquid-phase mass-transfer mechanism (ion diffusion). The sulfide precipitation of Cu(Ⅱ)/As(Ⅲ) is a co-deposition process. With the increase of sulfidizing agent dosage ( S/Cu ratio) and sulfidation time ( t ), the Cu(Ⅱ) concentration gradually decreases to reach complete removal, while the further increase of S/Cu ratio and t leads to the decrease of copper content in the sulfide precipitates. Finally, the methods are demonstrated that detected accurately Cu(Ⅱ) and As(Ⅲ) concentrations in a rapid and non-destructive manner. This work not only provides a novel perspective on the efficient separation of Cu(Ⅱ)/As(Ⅲ) in copper smelting waste acid, but also opens a unique approach for direct and rapid detection of Cu(Ⅱ)/As(Ⅲ) concentration during the sulfuration process. Hence, this research is a guide for the regulating means ( S/Cu and t ) in the actual multi-step sulfuration process of copper smelting waste acid treatment and electrorefining solution purification .
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APPLIED CATALYSIS A-GENERAL
·
2025
·
IF 4.8
Mengyao Luo,Longli Bo,Sining Huang,Haiguang Wang,Zhiyun Yang,Danjun Wang,Ying Yang,Zhe Li,Lu Wang
Adding polyethylene glycol (PEG) can lessen the shedding of coating and improve the dispersion of active particles for monolithic catalysts. In this study, a series of Cu-Mn-Ce-O x (P x )/TiO 2 (P x )/CH catalysts were prepared with different PEG molecular weights (P x , x = 200, 1000, and 2000) to explore the effect of P x addition on the structure and activity of the catalysts in microwave catalytic combustion of toluene. The research showed that P x addition (1 wt% dosage to titanium sol) to coating reduced the particle size of titanium sol and decreased the shedding rate of TiO 2 coating 0.9–0.93 %, and P x addition (3 wt% dosage to CH's water absorption) to active components further lessened the shedding rate of the catalysts 1.93–2.04 %. Under an initial toluene concentration of 1500 mg/m 3 and a gas hourly space velocity of 2260 h −1 , Cu-Mn-Ce-O x (P 1000 )/TiO 2 (P 1000 )/CH owned the highest catalytic activity and its complete removal temperature (T R100 ) and mineralization temperature (T M100 ) to toluene were 180℃ and 218℃, respectively, which were lower 33℃ and 16℃, 56℃ and 58℃ than Cu-Mn-Ce-O x /TiO 2 (P 1000 )/CH and Cu-Mn-Ce-O x /TiO 2 /CH catalysts separately, and its activity maintained steadily with toluene removal efficiencies of 99–91 % over 12 h. The improved activity is attributed to the uniform dispersion of active particles, larger specific surface area, and increased adsorbed oxygen, facilitated by pore-forming and steric-hindrance effects of P x . Electron transfer among Mn 4+ /Mn 3+ /Mn 2+ , Cu 2+ /Cu + , and Ce 4+ /Ce 3+ promoted the oxidation of toluene under microwave irradiation. Therefore, the research provides technological support for developing transition metals-based catalysts for industrial VOC waste gas treatment.
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WATER AIR AND SOIL POLLUTION
·
2024
·Vol. 235
·期 5
·1-17
·
IF 3.8
Zhou Zhuyou,Ji Yufeng,Wang Yong,Liu Menghe,Xu Ying,Liu Ruijie,Yang Mingjie,Zou Congyang
In this study, the carbon-doped bimetallic organic framework C 60 /MIL-101(Fe,Cu) catalyst was prepared for the first time via solvothermal synthesis method. The catalysts were characterized using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), and a series of other instruments. At the same time, methylene blue (MB) was used as the target degradation material to investigate the catalytic performance of H 2 O 2 for MB degradation under visible light. The degradation experiment showed that the removal rate of C 60 /MIL-101(Fe,Cu) to MB reached 99.2% within 80 min. Furthermore, cyclic experiments demonstrated good stability and reusability of the catalyst. Finally, the degradation mechanism of the reaction was deduced by quenching experiment, UV–vis diffuse reflection and mott-Schottky plots. The results show that hydroxyl radical (·OH) and superoxide radical (·O 2 − ) play a major role in the degradation of MB during photo-Fenton process.
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