Molecular Catalysis
·
2025
·
IF 4.9
Dongmin Zhao,Zhe Hong,Jiantao Liu,Lingling Yin,Hui Bai,Xiaodong Wang,Zhihua Gao,Wei Huang
The valence state and size of copper species play a critical role in the conversion of syngas to higher alcohols. In this study, CuAl binary catalysts with tunable Cu + -Cu 0 ratios and broad size distributions were successfully synthesized by adjusting the heat-treatment pressure of complete liquid-phase method, and their performance in CO hydrogenation was evaluated. The characterization results demonstrated that increasing heat-treatment pressure led to a general increase in both the Cu species size and the Cu⁺/(Cu⁺+Cu 0 ) ratio. Additionally, heat-treated under high pressure significantly enhanced the interaction between the Cu and Al components, promoted the formation of oxygen vacancies on AlOOH, and facilitated electron transfer. Notably, the oxygen vacancy content exhibited a linear correlation with the Cu + /(Cu + +Cu 0 ) ratio. The catalytic performance revealed a synergistic effect between the valence state and size of copper species in promoting higher alcohol synthesis. The percentage of C 2+ OH increased with the rise in Cu + /(Cu + +Cu 0 ) ratio and the size of Cu 0 and Cu 2 O. Among the catalysts, C-4 exhibited the largest Cu 0 and Cu 2 O sizes and the highest Cu⁺/(Cu⁺+Cu 0 ) ratio, achieving the highest proportion of higher alcohols (53.52 %). In-situ DRIFTS experiments also confirmed the synergistic effect of both factors. Larger Cu particles facilitated the dissociative adsorption of CO, while Cu⁺ sites favored the non-dissociative adsorption of CO. This work significantly expands the understanding of the role of Cu + -Cu 0 ratios and larger copper species in syngas conversion, offering valuable insights for the design of Cu-based catalysts with a high selectivity toward C 2+ OH.
研究领域:
催化化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
MINERALS ENGINEERING
·
2020
·
IF 3.795
Peilun Shen,Dianwen Liu,Xiaohui Xu,Xiaodong Jia,Xiaolin Zhang,Kaiwei Song,Jinpeng Cai
In this study, for the first time, we applied ammonium phosphate to pre-treat chrysocolla prior to sulfidization flotation. In addition, we investigated the structural characteristics of the copper sulfide film formed on the chrysocolla surfaces and its response to flotation. Micro-flotation experiments revealed that the addition of (NH 4 ) 3 PO 4 prior to sulfidization greatly improves the floatability of chrysocolla and its recovery increased from 8.71% to 87.97% with butyl xanthate as the collector. The results of the field emission scanning electron microscopy analysis showed that numerous regular fragments appeared on the chrysocolla surfaces after the addition of (NH 4 ) 3 PO 4 . The X-ray diffraction and X-ray photoelectron spectrometry analysis confirmed that these fragments were newly formed copper sulfide covering the chrysocolla surfaces, during this process a chemical reaction occurred in the slurry system, i.e. the Cu 2+ were reduced to Cu + , the S 2− were mainly oxidized to S − , (S 2 ) − , (S 2 ) 2− . The copper sulfide species primarily in the form of crystalline covellite (Cu + 3 (S 2 ) 2− S − ), which is the key to obtaining good flotation recovery. As a specific activator, (NH 4 ) 3 PO 4 participates in the liquid-solid phase chemical reaction between the sulfidizing reagent and the chrysocolla, which promotes the sulfidization reaction of chrysocolla.
研究领域:
矿物加工工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Brain Hemorrhages
·
2025
·
IF 1.4
Wenying Zhang,Wanyu Ma,Siying Ren,Likun Wang,Guofeng Wu
Intracerebral hemorrhage (ICH) is a severe stroke subtype with high mortality and disability. Cuproptosis is a regulatory cell death modality dependent on intracellular copper ion concentration, the role of which in ICH is unclear. Upon activation by ligand agonists, peroxisome proliferator-activated receptor-γ (PPARγ), can alleviate brain injury after ICH. To investigate the inhibitory effect of activating PPARγ on cuproptosis following ICH, we established the ICH model in vivo and in vitro and they were treated with the PPARγ agonist or antagonist after models being established successfully. Then, the copper ion concentration was measured by copper colorimetric assay and the expression of cuproptosis-related regulatory factors and copper transporter 1 was detected by western blotting and immunofluorescence staining (except in the cell level). We found that the increase in copper ion concentration following ICH leads to the disruption of copper homeostasis, inducing cuproptosis via copper toxicity. Activating PPARγ regulates the expression of cuproptosis-associated positive or negative regulatory factors and mitigates copper toxicity by inhibiting the influx of copper ions into the cell, thereby inhibiting cuproptosis. This study not only reveals the relationship between ICH and cuproptosis but also may provide new therapeutic strategies for improving the prognosis of patients with ICH.
研究领域:
神经科学
·
分子生物学
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产品关联
DOI
高影响因子
BIORESOURCE TECHNOLOGY
·
2018
·
IF 5.807
Zheng-Zhe Zhang,Ya-Fei Cheng,Lian-Zeng-Ji Xu,Jing Wu,Yu-Hui Bai,Jia-Jia Xu,Zhi-Jian Shi,Ren-Cun Jin
Metal and metal oxide nanoparticles (NPs) show differences in antimicrobial activity due to different chemical and physical properties. Using copper as a representative example, this study compared the NP effects on anaerobic ammonium oxidation (anammox) bacteria in wastewater treatment. Long-term exposure to 5 mgCu L −1 CuNPs reduced the physiological activity and abundance of anammox bacteria, thereby causing deterioration of reactor performance. However, anammox granules exhibited stronger resistance and resilience to perturbation by 1–160 mgCu L −1 CuONPs, and no adverse effects on performance were observed. Moreover, the level of Cu(II) released from NPs in the influent exhibited good correlations with variations of the community structure and sludge properties. Therefore, the effects of Cu-based NPs on anammox sludge properties are dependent on their forms and levels, and their discrepant effects are partially attributed to their ability to release ionic copper.
研究领域:
环境科学
·
微生物学
✓ 已验证
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
·
2023
·Vol. 24
·期 11
·9673
·
IF 5.6
Zitong Yuan,Yiwei Li,Yuke He,Kun Qian,Yongqiang Zhang
The overuse of copper-based fertilizers and pesticides over the last few decades has resulted in detrimental risks to our environment. Nano-enabled agrichemicals with a high effective utilization ratio have shown great potential for maintaining or minimizing environmental issues in agriculture. Copper-based nanomaterials (Cu-based NMs) serve as a promising alternative to fungicides. Three types of Cu-based NMs with different morphologies were analyzed for their different antifungal effects onAlternaria alternatain this current study. Compared to commercial copper hydroxide water power (Cu(OH)2WP), all tested Cu-based NMs, including cuprous oxide nanoparticles (Cu2O NPs), copper nanorods (Cu NRs) and copper nanowires (Cu NWs), especially Cu2O NPs and Cu NWs, showed higher antifungal activity againstAlternaria alternata. Its EC50were 104.24 and 89.40 mg L−1, respectively, achieving comparable activity using a dose approximately 1.6 and 1.9-fold lower. Cu-based NMs could introduce the downregulation of melanin production and soluble protein content. In contrast to trends in antifungal activity, Cu2O NPs showed the strongest power in regulating melanin production and protein content and similarly exhibited the highest acute toxicity to adult zebrafish compared to other Cu-based NMs. These results demonstrate that Cu-based NMs could offer great potential in plant disease management strategies.Keywords:cuprous oxide nanoparticles;copper nanorods;copper nanowires;nano-pesticide;zebrafish;Alternaria alternata
研究领域:
农业科学
·
纳米技术
·
毒理学
·
植物病理学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Xuwen Liu,Yan Hu,Caimin Yang,Jiaxin Su,Yinghua Ye,Ruiqi Shen
Chitosan (CTS) is a well-known adsorbent capable of absorbing copper ions . It's also a high-quality biomass carbon source. The carbon skeleton formed by the pyrolysis of CTS has outstanding electrical conductivity , which can help copper azide (CA), a new type of primary explosive that's particularly sensitive to electrostatic stimuli, be more electrostatically safe. The CTS-Cu complex is precipitated by using CTS to adsorb and flocculate copper ions in wastewater. To construct the Cu@carbonized chitosan (CCTS) precursor material, the organic ligands in the CTS-Cu complex are calcined into a porous three-dimensional carbon matrix, and the copper ions are transformed into copper nanoparticles embedded in CCTS. The azide reaction converts copper nanoparticles (CuNPs) into high-energy CA. With its good electrical conductivity, CCTS maintains its framework structure and effectively improves the electrostatic safety of composite energetic materials. CA@CCTS has a CA content of 69.7%, an electrostatic ignition energy (E 50 ) of about 1.19 mJ, and a heat release of 1803.22 J/g. This work takes advantage of CA and CTS's environmental friendliness. CA@CCTS, as a novel lead-free primary explosive, has good electrostatic safety while containing a high proportion of CA.
研究领域:
环境科学
·
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOM
·
2025
·
IF 2.3
Che Wenfang,Deng Rongdong,Xiao Shijie,Zhang Jing,Wu Siyuan,Jiao Fen
To address the challenges associated with the agglomeration and encapsulation of chalcopyrite by molybdenite in flotation slurries, which hinder the effective separation of copper and molybdenum, this study investigated the effects of various dispersants on the dispersion behavior of chalcopyrite and molybdenite, along with the underlying mechanisms. Optical microscopy, focused beam reflectance measurements (FBRM), infrared spectroscopy, zeta potential analysis, and other analytical techniques were employed. The results revealed that the dispersion behaviors of chalcopyrite and molybdenite align with the EDLVO theoretical model. At a slurry pH of 12, the dispersant effectively dispersed molybdenite and minimized its agglomeration around chalcopyrite. The dispersive capabilities of the tested dispersants followed the order: sodium carbonate (Na 2 CO 3 ) > sodium hexametaphosphate (SHMP, (NaPO 3 ) 6 ) > sodium silicate (Na 2 O·nSiO 2 ) > ammonium bicarbonate (NH 4 HCO 3 ). Specifically, carbonate ions produced by the hydrolysis of Na2CO3 were chemically adsorbed onto the molybdenite surface, while hexametaphosphate primarily adhered through physical adsorption. This adsorption enhanced the dispersion of molybdenite particles by increasing electrostatic repulsion between them. Mixed ore flotation experiments demonstrated that both Na 2 CO 3 and SHMP significantly reduced the copper grade in the molybdenum concentrate, from 3.95% to 2.69% and 2.67%, respectively.
研究领域:
矿物加工工程
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Nanomaterials
·
2020
·Vol. 10
·期 4
·774
·
IF 4.324
Fang Peng,Yan Sun,Yue Lu,Weiwei Yu,Meiying Ge,Jichao Shi,Rui Cong,Jiaming Hao,Ning Dai
In this work, the high crystalline copper oxide (CuO) nanoparticles were fabricated by a hydrothermal method, and their structural properties were characterized by transmission electron microscopy (TEM), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS). The sensing results show that CuO nanoparticles exhibit enhanced sensitivity and good selectivity for hydrogen sulfide (H2S) gas at a low temperature. There are two working mechanisms involved in the H2S sensing based on CuO nanoparticle sensors. They are the H2S oxidation mechanism and the copper sulphide (CuS) formation mechanism, respectively. The two sensing mechanisms collectively enhance the sensor’s response in the H2S sensing process. The Cu–S bonding is stable and cannot break spontaneously at a low temperature. Therefore, the CuS formation inhibits the sensor’s recovery process. Such inhibition gradually enhances as the gas concentration increases from 0.2 ppm to 5 ppm, and it becomes weaker as the operating temperature rises from 40 °C to 250 °C. The XPS results confirmed the CuS formation phenomenon, and the micro Raman spectra demonstrated that the formation of CuS bonding and its decomposition can be effectively triggered by a thermal effect. Gas-sensing mechanism analysis supplied abundant cognition for the H2S sensing phenomena based on CuO materials.Keywords:CuO;H2S;mechanism;oxidation;CuS formation
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ENVIRONMENTAL MANAGEMENT
·
2022
·
IF 8.91
Jiequan Liu,Ruyi Zhou,Junxia Yu,Li Guo,Xiaodi Li,Chunqiao Xiao,Haobo Hou,Ruan Chi,Guoqing Feng
Potentially toxic elements including lead (Pb), manganese (Mn), and copper (Cu) released from copper tailings would cause severe long-term environmental risks and potential threats to human health. To prevent these negative effects caused by the release of the metals, a novel magnetic carboxyl groups modified bagasse with high adsorption affinity and strong magnetism was synthesized through an in-situ precipitation method and used to simultaneously remove Pb, Mn, and Cu from the eluate of copper tailings. Results showed that release of Pb, Mn, and Cu from the copper tailings was pH, time, and particle size dependent, and maximum concentrations of them released in the eluate was 1.7, 1.9, and 4.1 mg L −1 under weak acid conditions. Batch adsorption experiment showed that the as-synthesized magnetic modified bagasse could selectively absorb Pb, Mn, and Cu from a complex solution with adsorption capacity of 137.3, 13.1, and 90.0 mg g −1 , respectively. X-ray photoelectron spectroscopy (XPS) and energy dispersive spectroscopy-mapping (EDS-mapping) demonstrated that Pb, Mn, and Cu interacted with the magnetic modified biosorbent mainly through coordination and ion exchange. Column experiments showed that higher than 99.5% of the released Pb, Mn, and Cu could be simultaneously removed by the magnetic modified bagasse, and the maximum concentrations of them released in the eluate of the copper tailings were all decreased to lower than 0.01 mg L −1 , which reached the discharge standards. After recycled by a magnet, the magnetic modified bagasse could be collected easily and used repeatedly. Because of the high efficiency and easy recovery, the used method had great practical application value in removal of potentially toxic elements released from metallic tailings.
研究领域:
环境科学
·
生物技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nanoscale
·
2024
·Vol. 16
·期 28
·13642-13653
·
IF 5.8
Ziyin Yang,Chongchao Zhang,Chengcheng Qi
Which is more suitable as a sensing material between metal single-atoms and nanoparticles? Herein, electrocatalytic behaviors of copper single-atoms (Cu SAs) and copper nanoparticles (CuNPs) toward H2O2 reduction and glucose oxidation were studied. Surprisingly, the electrocatalytic activity of Cu SAs and CuNPs showed significant differences in H2O2 reduction and glucose oxidation. Compared with CuNPs, Cu SAs exhibit outstanding activity in the electrocatalytic reduction of H2O2 but exhibit weak activity in the electrocatalytic oxidation of glucose. On the contrary, CuNPs exhibit excellent activity in the electrochemical oxidation of glucose but have very weak electrocatalytic activity towards H2O2 reduction. DFT results show that H2O2 reduction is more favourable with Cu SAs; however, the electrochemical oxidation of glucose with CuNPs requires overcoming much lower energy barriers than that with Cu SAs. This study proves that both metal single-atoms and nanoparticles are not omnipotent, which provides ideas for constructing highly active sensing materials.
研究领域:
材料科学
·
电化学
·
生物传感
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Minerals
·
2020
·Vol. 10
·期 2
·157
·
IF 2.38
Chonghui Zhang,Tingshu He,Wei Chen,Xianzhong Bu,Sen Wang,Xiaozhen Tian
Sodium thioglycolate is a chalcopyrite depressant, but its depressant effect is weak. The paper investigated the effect of CuSO4on the depressant performance of sodium thioglycolate towards chalcopyrite through flotation tests, Zeta potential measurements, X-ray photoelectron spectroscopy (XPS) analyses and Fourier-transform infrared (FTIR) spectra measurements. It was found that copper ions could improve the depressant effect of sodium thioglycolate on chalcopyrite. The results showed that copper ions could adsorb on the surface of chalcopyrite and form mixed copper sulfide and cupric oxides/hydroxides adsorption layers. As a result, the mineral composition on the chalcopyrite surface was changed. With sodium thioglycolate treatment, the Zeta potential and the adsorption sites of chalcopyrite surface were both increased, and the hydrophobic substance Sn2−/S0concentration was decreased. The electrostatic repulsion of chalcopyrite surface with sodium thioglycolate was also decreased, which made the sodium thioglycolate interact with chalcopyrite more easily. The more active sites could adsorb more sodium thioglycolate, which improved the hydrophilia of chalcopyrite. At the same time, the decrease of Sn2−/S0concentration could further improve the hydrophilia of chalcopyrite. The results show that the copper ions could exhibit auxiliary effect with sodium thioglycolate and could further enhance the depressant effect of sodium thioglycolate on the chalcopyrite flotation. This paper provides new insights into the depression of chalcopyrite flotation by sodium thioglycolate.Keywords:flotation;chalcopyrite;sodium thioglycolate;copper ions;depressant
研究领域:
矿物加工工程
·
表面化学
✓ 已验证
产品关联
DOI
高影响因子
AQUATIC TOXICOLOGY
·
2014
·
IF 3.513
Tao Wang,Xiaohua Long,Yongzhou Cheng,Zhaopu Liu,Shaohua Yan
Copper nanoparticles (Cu-NPs) were widely used in various industrial and commercial applications. In this study the effects of Cu-NPs and soluble Cu were investigated on juvenile Epinephelus coioides . The fish were exposed in triplicate to control, 20 or 100 μg Cu L −1 as either copper sulphate (CuSO 4 ) or Cu-NPs in a semi-static aqueous culture for 25 days. The growth parameters were significantly lower at 100 μg Cu L −1 as CuSO 4 or Cu-NPs treatment compared to control. Time-dependent Cu accumulation in all tissues increased with increasing the Cu dose. The percentage of total Cu found in remaining tissues (head, bones, fins, etc.) decreased more in the CuSO 4 than Cu-NPs treatment after 25 days, but increased in all other tissues (especially in liver). Compared with the control, either Cu-NPs or CuSO 4 induced higher malonaldehyde concentration in tissues by overwhelming total superoxide dismutase activity, total glutathione concentration and Na + /K + -ATPase activity, but the opposite results were recorded for the brain. With increasing the CuSO 4 or Cu-NPs dose, apoptosis was exacerbated in the liver and gills, more so by CuSO 4 than Cu-NPs. Overall, these findings showed that Cu-NPs had the toxic effects similar to dissolved Cu; hence, Cu-NPs need to be included in the assessment of toxicological impacts in the aquatic environment.
研究领域:
环境科学
·
毒理学
·
水产养殖学
✓ 已验证
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）