SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Yonghao Wang,Shanshan Lei,Miao Liu,Ming Zhou,Zhiwei Zou,Youmei Liu,Xiaomei Zheng
Electrocatalytic reduction of nitrate (NO 3 RR) to ammonia is considered as a promising strategy for nitrogen resource recovery from nitrate-contaminated water. However, conventional Cu-based catalysts often suffer from poor selectivity, with toxic nitrite accumulation and sluggish reduction kinetics. This work reports a Cu Co co-loaded carbon catalyst (CuCo-C) that leverages electron-deficient Cu sites in synergy with Co to significantly enhance the NO 3 RR activity and ammonia selectivity. The optimized CuCo-C discloses a nitrate removal rate of 94 %, an ammonia selectivity of 99 % and multi-turn stability. The combination of comprehensive surface analysis and experimental techniques reveals that the high NO 3 − -to-NH 4 + performance results from Co-induced electronic modulation of Cu sites. This synergistic effect not only kinetically facilitate the adsorption and activation of NO 3 − but also enhance the selectivity of key intermediate (NO 2 − ) towards NH 4 + formation. Density Functional Theory (DFT) calculations and synchrotron radiation-based XAFS measurements further reveal the presence of Co promotes the adsorption of NO 3 − (forming *NO 3 ), lowers the energy barrier for *NO 3 to *NO 2 deoxygenation and simultaneously suppresses the competing H 2 evolution reaction. Importantly, the presence of Co promotes the conduction of the electron reduction path by CuCo-C to generate NH 4 + . This work provides valuable insights for the rational design of high-performance Cu-based electrocatalysts for sustainable nitrate remediation and ammonia synthesis.
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DOI
高影响因子
Korean Journal of Materials Research
·
2024
·Vol. 34
·期 9
·422-431
·
IF 0.3
Shu Ye,Jing Cheng,Zeda Meng,Won-Chun Oh
Hydrothermal and ultrasonic processes were used in this study to synthesize a single-atom Cu anchored on t-BaTiO3. The resulting material effectively employs vibration energy for the piezoelectric (PE) catalytic degradation of pollutants. The phase and microstructure of the sample were analyzed using X-ray diffraction (XRD) and scanning electron microscopy (SEM), and it was found that the sample had a tetragonal perovskite structure with uniform grain size. The nanomaterial achieved a considerable increase in tetracycline degradation rate (approximately 95 % within 7 h) when subjected to mechanical vibration. In contrast, pure BaTiO3 demonstrated a degradation rate of 56.7 %. A significant number of piezo-induced negative charge carriers, electrons, can leak out to the Cu-doped BaTiO3 interface due to Cu's exceptional conductivity. As a result, a single-atom Cu catalyst can facilitate the separation of these electrons, resulting in synergistic catalysis. By demonstrating a viable approach for improving ultrasonic and PE materials this research highlights the benefits of combining ultrasonic technology and the PE effect.
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高影响因子
Catalysts
·
2022
·Vol. 12
·期 12
·1515
·
IF 4.501
Ding Zhang,Yun-Fei Li,Li-Xue Liu,Lei Duan,Zhi-Li Ren,Shou-Dong Xu,Liang Chen,Hui-Juan Guo,Yi Huang,Li-Juan Shi,Qun Yi
Among clean energy transformation devices, fuel cells have gained special attention over the past years; however, advancing appropriate non-valuable metal impetuses to halfway supplant the customary Pt/C impetus is still in progress. In this paper, we propose a specific electrocatalyst in the formula of highly-active Cu species, associated with coated carbon (Cu@C-800), for oxygen reduction reaction (ORR) through post-treatment of a self-assembled precursor. The optimized catalyst Cu@C-800 showed excellent ORR performance (i.e., the onset potential was 1.00 V vs. RHE, and half-wave potential of 0.81 V vs. RHE), high stability, resistance to methanol, and high four-electron selectivity. The enhancement is attributed to the synergy between the carbon matrix and a high explicit surface region and rich Cu nano-species.
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高影响因子
Frontiers in Chemistry
·
2022
·
IF 5.545
Arsalan Muhammad,Saddique Imram,Baoji Miao,Awais Azka,Khan Ilyas,Shamseldin Mohamed A.,Mehrez Sadok
We aimed to synthesize sensitive electrochemical sensors for hydrogen peroxide sensing by using zinc oxide nanorods grown on a fluorine-doped tin oxide electrode by using the facial hydrothermal method. It was essential to keep the surface morphology of the material (nanorods structure); due to its large surface area, the concerned material has enhanced detection ability toward the analyte. The work presents a non-enzymatic H2O2 sensor using vertically grown zinc oxide nanorods on the electrode (FTO) surfaces with Cu nanoparticles deposited on zinc oxide nanorods to enhance the activity. Scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), energy-dispersive X-Ray (EDX), X-ray diffraction (XRD), and electrochemical methods were used to characterize copper–zinc oxide nanorods. In addition to the high surface area, the hexagonal Cu-ZnO nanorods exhibited enhanced electrochemical features of H2O2 oxidation. Nanorods made from Cu-ZnO exhibit highly efficient sensitivity of 3415 μAmM−1cm−2 low detection limits (LODs) of 0.16 μM and extremely wide linear ranges (0.001–11 mM). In addition, copper-zinc oxide nanorods demonstrated decent reproducibility, repeatability, stability, and selectivity after being used for H2O2 sensing in water samples with an RSD value of 3.83%. Cu nanoparticles decorated on ZnO nanorods demonstrate excellent potential for the detection of hydrogen peroxide, providing a new way to prepare hydrogen peroxide detecting devices.
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高影响因子
CATALYSIS TODAY
·
2015
·
IF 3.893
Zhiyuan Song,Dezhang Ren,Tian Wang,Fangming Jin,Qianhui Jiang,Zhibao Huo
An efficient conversion of biomass-derived cyclohexanone to cyclohexanol by in situ-formed hydrogen over Cu catalyst under hydrothermal conditions was reported at first. Among the catalysts tested, Cu exhibited high catalytic activity for the conversion of cyclohexanone, and the highest yield of 100% was obtained when Zn acted as reductant. The experiment was carried out by using gaseous hydrogen as the external hydrogen source indicated that the yield of 75.1% was lower than in situ-formed hydrogen by oxidation of Zn in water. The present study provides an efficient route by environmentally benign, commercially available Cu powder as a catalyst for cyclohexanone conversion to cyclohexanol.
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高影响因子
Journal of Materials Chemistry B
·
2020
·Vol. 9
·期 3
·710-718
·
IF 5.344
Zhengdi Wang,Liyang Fu,Yu Zhu,Sa Wang,Guohong Shen,Lan Jin,Ruizheng Liang
The combination of chemodynamic therapy (CDT) with photothermal therapy (PTT) is an efficacious strategy in cancer treatment to acquire satisfactory therapy efficiency in the endogenous redox reaction and external laser induction. In this work, we have designed Ce doped Cu–Al layered double hydroxide (CAC-LDH) ultrathin them through a bottom-up synthesis method, and further loaded them with indocyanine green (ICG). The synthesized ICG/CAC-LDH was used as a Fenton-catalyst and photothermal agent. With the Fenton activity, the ICG/CAC-LDH nanosheets could decompose H2O2 and exhibit a low KM value (1.57 mM) and an ultra-high Vmax (4.88 × 10−6 M s−1) value. Due to the presence of oxidized metal ions, ICG/CAC-LDH could induce intracellular GSH depletion and reduce Cu2+ and Ce4+ to Cu+ and Ce3+, respectively. The generated Cu+ and Ce3+ further reacted with local H2O2 to generate toxic hydroxyl radicals (˙OH) via the Fenton reaction. Owing to the obviously enhanced absorption of ICG/CAC-LDH at 808 nm, the photothermal efficiency of ICG/CAC-LDH increased significantly compared with ICG (ΔT = 34.7 °C vs. 28.3 °C). In vitro studies substantiate the remarkable CDT/PTT efficacy, with complete apoptosis of HepG2 cancer cells (the cell viability is less than 2%) treated with 25 μg mL−1 of ICG/CAC-LDH. Furthermore, ICG/CAC-LDH could also act as a contrast agent for cancer magnetic resonance imaging (MRI) and photoacoustic imaging (PAI). These results demonstrate the potential of ICG/CAC-LDH as an integrated agent for dual-modal imaging and synergistic CDT/PTT.
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高影响因子
Frontiers in Environmental Science
·
2022
·
IF 5.411
Ma Yameng,Huang Xiao,Han Qi,Yu Jianghua,Yu Fengjiao,Zhu Jia
The strong stability of Cu–ethylenediaminetetraacetic acid (Cu–EDTA) results in the low decomplexation efficiency by the traditional Fenton process. For breaking this limitation, a three-dimensional electro-Fenton (3D-EF) system was constructed to study the decomplexation of Cu–EDTA at different pH, and the effects of Fe2+ concentration, particle electrode dosage, current density, and coexisting ions on decomplexation performance were investigated. The results showed that 3D-EF exhibited high pollutant removal efficiency in a wide pH range compared with the traditional electro-Fenton process. The optimal conditions for the removal of Cu–EDTA were as follows: the pH was 7, Fe2+ was 1 mmol L−1, granular activated carbon was 2 g L−1, and current density was 10 mA cm−2, and the optimum Cu–EDTA removal efficiency reached 90.95%. In addition, the presence of Cl− slightly improved the decomplexation efficiency, whereas NO3− and HPO42− inhibited the removal of Cu–EDTA. The kinetics of Cu–EDTA decomplexation in all experimental groups followed the first-order kinetic equation.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2017
·
IF 3.133
Y. Zhang,F.F. Lin,T. Wei,L.Z. Pei
Cu bismuthate nanosheets have been synthesized by a facile hydrothermal process. The structure and morphology of the nanosheets are analyzed by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and high-resolution TEM (HRTEM). Electrochemical performance for the determination of tartaric acid using Cu bismuthate nanosheets has also been analyzed by cyclic voltammetric (CV) method. XRD pattern shows that the Cu bismuthate nanosheets are composed of tetragonal CuBi 2 O 4 phase. Electron microscopy observations indicate that the Cu bismuthate nanosheets have the polycrystalline structure with the thickness of about 50 nm and width of 300 nm-2 μm. The morphological and structural evolution of the products have been analyzed by controlling the hydrothermal temperature and reaction time. The Cu bismuthate nanosheets modified glassy carbon electrode (GCE) is used to investigate the electrochemical performance for the detection of tartaric acid in 0.1 M KCl electrolyte. A pair of semi-reversible CV peaks are located at −0.45 V and −0.02 V at the Cu bismuthate nanosheets modified GCE in 2 mM tartaric acid. The calculated detection limit is 1.6 μM at the signal to noise ratio of 3 with tartaric acid concentration of 0.005–2 mM. The nanosheets modified GCE shows good application promising for the electrochemical detection of biological molecules.
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Jie Chen,Wenhao Xu,Xingjin Li,Libo Sun,Zihan Zhong,Zitao Zhang,Yun Tang
The optical properties of cost-effective Ag-Cu bimetallic nanocrystals, with synergistically enhanced catalytic and biological activities, are limited within ultraviolet–visible region due to lack of morphology control. In order to overcome this constraint, two-dimensional (2D) Ag-Cu bimetallic heterostructures were designed and synthesized by a seed-mediated colloidal growth method. The conformal Cu domain was epitaxially deposited on Ag nanoplates with different spatial configuration under retention of their 2D shape. Both of the 2D Ag-Cu core@shell and Janus structures display tunable localized surface plasmon resonance from visible to near infrared regions. The results of catalytic reduction of 4-nitrophenol show that the 2D Ag-Cu core@shell structure has better synergistic catalytic performance than Janus structure and Ag plates. In addition to surface-related synergistically enhanced bactericidal performance, their antibacterial effect can also be significantly enhanced by near infrared light irradiation. These results indicate that 2D Ag-Cu heterostructures can benefit from both synergistically improved surface activity and great optical responsive characteristics.
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DOI
高影响因子
MOLECULES
·
2021
·Vol. 26
·期 4
·978
·
IF 4.412
Peng Liu,Hui Ruan,Tiantian Li,Jiaqi Chen,Fuqiu Ma,Duoqiang Pan,Wangsuo Wu
The low cost β-zeolite and ethylenediamine modified β-zeolite (EDA@β-zeolite) were prepared by self-assembly method and used for Cu(II) removal from contaminated aqueous solution. Removal ability of β-zeolite toward Cu(II) was greatly improved after ethylenediamine (EDA) modification, the removal performance was greatly affected by environmental conditions. XPS results illustrated that the amide group played important role in the removal process by forming complexes with Cu(II). The EDA@β-zeolite showed desirable recycling ability. The finding herein suggested that the proposed composite is a promising and suitable candidate for the removal of Cu(II) from contaminated natural wastewater and aquifer.
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DOI
高影响因子
Journal of Cleaner Production
·
2023
·
IF 11.1
Lujie Zuo,Shufan Yu,Rongjun Zhang,Hongwei Li,Yu Wu,Rufat Abiev,Zhao Sun,Zhiqiang Sun
Methanol is a competitive candidate for in-situ hydrogen supply; however, the techniques of methanol-to-hydrogen production are suffered from high reforming temperatures and catalyst deactivation . In this work, the chemical looping oxidative reforming of methanol is conducted using a Pd–Cu-based catalytic oxygen carrier (PdO–CuO–CuMn 2 O 4 ). Synergistic enhancement of lattice oxygen induction and Pd–Cu alloy activation is confirmed, thereby achieving efficient methanol reforming at a temperature as low as 200 °C. Under such low temperatures, the hydrogen production rate can reach an average of 11.2 times higher than that of CuO/ZnO/Al 2 O 3 . Moreover, the catalytic oxygen carrier remains relatively satisfying redox durability after 30th cycle. SEM and AFM measurements reveal the high degree of roughness at the PdO–CuO–CuMn 2 O 4 surface, in which the methanol activation can be effectively promoted. XRD and XPS measurements verify the formation of Pd–Cu alloy, as proved by the charge transfer from Pd to Cu. During the redox looping, Pd–Cu alloy is formed and re-separated to be PdO and CuO, thus remaining homogenous distribution of the active phase on an atomic scale. Meanwhile, the lattice oxygen also plays a crucial role in methanol activation, synergistically enhancing the low-temperature reforming of methanol. This study provides a new implication for designing functionalized catalytic oxygen carrier materials , which will substantially promote in-situ hydrogen supply for proton exchange membrane fuel cells.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2019
·
IF 5.107
Guichen Gong,Pan Wang,Jie Liu,Yuexin Han,Yimin Zhu
The effect and mechanism of Cu(II) on the flotation separation of cassiterite from fluorite using styrene phosphonic acid (SPA) as a collector were investigated by flotation tests, zeta potential measurements, X-ray photoelectron spectroscopy (XPS) analysis and density function theory (DFT) calculations. SPA showed good collecting ability for both cassiterite and fluorite, and Cu(II) could intensively and selectively depress fluorite. At pH 4.0, using 100 mg/L SPA as the collector and 5 × 10 −4 mol/L Cu(II) as the inhibitor, a tin concentrate with a grade of 92.3% SnO 2 and a recovery of 85.6% was obtained for an artificially mixed sample which contained 47.86% SnO 2 . Zeta potential and XPS analyses indicated that Cu(II) was anchored on cassiterite surface but not on fluorite surface, and Cu(II) hindered the adsorption of SPA on fluorite but had negligible influence on the adsorption of SPA cassiterite. DFT calculations confirmed that the affinity between Cu(II) and SPA is much stronger than that between Cu(II) and fluorite surface, and the adsorption of SPA on cassiterite surface was not weakened by the presence of Cu(II). Consequently, it was inferred that Cu(II) consumed the collector SPA in the pulp, and the flotation of cassiterite was unaffected but fluorite was depressed by Cu(II). Therefore, Cu(II) is an effective inhibitor for the flotation separation of cassiterite from fluorite.
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高影响因子
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