JOURNAL OF MOLECULAR LIQUIDS
·
2025
·
IF 5.2
Wanting Yang,Zhuoyue Lan,Xiong Li,Yunchuan Li,Hang Li,Yunxiang Du
To efficiently enrich fine copper-molybdenum ore, a pioneering method was employed by utilizing MCO (trimethyl-pyridin) and kerosene as high-efficiency composite collectors in the flotation process. Micro-flotation and actual ore flotation tests demonstrated that the composite collector manifested superior collection capacity and selectivity compared to using a single collector. Furthermore, the inclusion of kerosene reduced collector consumption, thereby lowering overall reagent costs. TOC test results indicated that the composite collector possesses a high adsorption quantity on the mineral surface. Additionally, contact angle measurements demonstrated that the composite collector significantly enhanced the surface hydrophobicity of chalcopyrite and molybdenite. FT-IR, XPS, and ToF-SIMS analyses were conducted to investigate the adsorption mechanism. The results illustrated that MCO adsorbed to mineral surfaces by forming complexes with Cu atoms in chalcopyrite and Mo atoms in molybdenite, respectively. The primary interaction between kerosene and copper-molybdenum ore involved hydrophobic attraction with kerosene physically adhering to the mineral surface to form hydrophobic aggregates. Hence, this study presented an effective procedural approach for the flotation of fine copper-molybdenum ore.
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DOI
高影响因子
DALTON TRANSACTIONS
·
2025
·
IF 3.3
Qingmiao Mu,Jia Li,Hongxi Gu,Lijun Ren,Juan Du,Hualei Cheng,Dengwei Hu
Photoswitchable fluorescent materials (PFMs) have attracted considerable attention due to the intrinsic advantages of non-contact operation, cleanliness, and non-invasiveness. Conventional PFMs always require complicated preparation processes with poor fluorescence switching properties, which are affected by the mechanisms of Föster resonance energy transfer (FRET) or photoinduced electron transfer (PET). The WO3-x QDs/Cu NCs composite films are prepared on different substrates by a solution casting method and displays outstanding fluorescence switching properties owing to the super photochromic performance of WO3-x QDs and aggregation-induced fluorescence of Cu NCs. The composite film exhibits reversible on/off switchable fluorescence under UV light irradiation and heat treatment based on the inner filter effect (IFE) mechanism. The composite film shows dynamic variations of the dual-mode signals, and the applications of UV sensing and anti-counterfeiting are analyzed. Sensitive dual-mode detection is realized in UV sensing, especially for UVB. The composite film has a dual-modal imaging capability with good reproducibility and high resolution for security information encryption and anti-counterfeiting. This work provides a novel strategy for fabricating advanced PFMs for multiple optical applications.
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产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2025
·Vol. 15
·期 15
·11893-11901
·
IF 4.6
Xixi Wu,Xiang Feng,Peng Yu,Jing Zhang,Rui Liu
Breast cancer remains a significant global health concern owing to the limitations of conventional therapies, such as side effects, drug resistance, and high costs. Nanocatalytic therapy has emerged as a promising alternative due to its tumor specificity, spatiotemporal controllability, and noninvasiveness. However, its effectiveness is limited by endogenous antioxidants like glutathione (GSH) and the low catalytic activity of nanocatalysts. Herein, an Cu/Au-doped polypyrrole nanocatalyst, Cu-AuPP, with multiple catalytic activities is developed by sequentially polymerizing pyrrole monomers using CuCl2 and HAuCl4, followed by PEGylation. The obtained Cu-AuPP catalyzes the production of hydroxyl radicals (·OH) and facilitates the oxidation of GSH to GSSG via redox reactions mediated by multivalent Cu ions, leading to oxidative damage, mitochondrial dysfunction, and tumor cell apoptosis. Upon 1064 nm laser irradiation, these catalytic activities were enhanced by elevated temperature and electron–hole separation mediated by Au nanoclusters, resulting in more intense oxidative damage to tumor cells. Collectively, the developed Cu-AuPP nanocatalytic medicine capable of simultaneously catalyzing GSH depletion and ·OH production via several improved catalytic mechanisms, has significant promise for the treatment of malignant tumors.
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产品关联
DOI
PubMed
高影响因子
ChemCatChem
·
2020
·Vol. 12
·期 6
·1639-1646
·
IF 4.853
Pan Li,Jianzhi Wang,Ning Cai,Lei Wang,Jing Tong,Faquan Yu
Graphical The center of attention : The CuO x @CoO nanorods grown on Cu Foam with the hierarchical configuration and the heterojunction interfaces enjoyed a couple of advantages of self-supported electrodes: needing no glue as an electrode, avoiding the agglomeration of MOFs-based particles, and forming the outward active figuration and large specific surface area. Those features lead to superior OER performances. The fabrication of cost-effective and performance-advanced electrocatalysts is in great requirements for water splitting to achieve sustainable oxygen production. A simple and effective precursor of ZIF-67 particles mounted on Cu(OH) 2 nanorods was induced by a template alignment method. After annealing, hierarchical CoO polyhedron-decorated CuO/Cu 2 O (CuO x ) nanorods on Cu foam (denoted as CuO x @CoO NRs/CF) were achieved, which displayed the heterojunction in CuO x components, hierarchical configuration and outward active sites. These features, verified by HRTEM, SEM, XPS and EDX, optimized the oxygen evolution reaction (OER) electrocatalyst. Benefiting from its large electrochemical surface area and the synergetic effect between CuO x and CoO, CuO x @CoO NRs/CF exhibited considerable catalytic activity with a low overpotential of 254 mV to obtain a current density of 10 mA cm −2 in alkaline electrolyte and a scarce loss of the initial catalyst activity over 24 h and over 5000 cycles. This work provides a channel to enhance the performance in OER.
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DOI
高影响因子
FUEL
·
2019
·
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.
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DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2018
·Vol. 135
·期 45
·46705
·
IF 1.901
Dapeng Gu,Longxiao Zhang,Suwen Chen,Kefeng Song,Shouyao Liu
The filling combination of polytetrafluoroethylene (PTFE)/Cu/Al 2 O 3 filled poly(methyl methacrylate) (PMMA) based composites aiming at low friction and wear is optimized based on L 9 (3 4 ) by Taguchi method. The worn morphologies of PMMA based composites are analyzed by scanning electron microscopy (SEM). The PTFE transfer film and the wear debris on the steel ball surface are analyzed by SEM and X-ray spectroscopy. It is observed that the friction and wear of PMMA can be obviously decreased by filling with PTFE, Cu, and Al 2 O 3 . PTFE has the most significant but Cu has the negligibly smallest contribution on both the friction coefficient and the wear rate. The lower friction coefficient (<0.2) appears by the combination of the mass ratio of PTFE larger than about 4.5% and the mass ratio of Al 2 O 3 lower than ∼7.5%. The lower wear rate (<5 × 10 −5 mm 3 /Nm) appears by the combination of the mass ratio of PTFE larger than about 5% and the mass ratio of Al 2 O 3 lower than ∼8%, but it does not include that PTFE is greater than about 8.5% and Al 2 O 3 is less than about 1.5%. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135 , 46705.
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DOI
高影响因子
Frontiers in Marine Science
·
2021
·
IF 4.912
Han Xiaoxin,Vogt Rolf D.,Zhou Jiaying,Zheng Boyang,Yu Xue,Feng Jianfeng,Lu Xueqiang
Environmental effects of microplastic are rather due to their adsorption capacity of contaminants than themselves. Aging is a key factor influencing adsorption properties of environmental microplastics. In order to clarify this influence, polyethylene (PE), polypropylene (PP), and polyethylene terephthalate (PET) microplastics with particle sizes of <0.9 mm, 0.9–2 mm, and 2–5 mm were artificially aged in seawater for 12 months. This enabled an assessment of the change in Cu(II) adsorption capacity to the microplastics particles under aging. According to the FTIR spectra, fresh microplastics were oxidized during the UV induced aging process. The adsorption capacities of microplastic were positively correlated with their aging time. After 12-months aging, the amount of Cu(II) adsorbed to the aged microplastics was 1.45–2.92 times higher than on the fresh microplastic particles. For PP and PET, the aging effect increased with decreasing size of the microplastic particles. In the case of PE, particles with the medium particle size (0.9–2 mm) had the strongest aging effect.
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高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2021
·Vol. 28
·期 30
·41504-41515
·
IF 4.223
Zhao Kang-He,Ma Yu-Long,Lin Feng,Ge Shao-Ying,Zhu Li
A composite Mn-Cu-Ce tri-metal oxide supported on γ-Al 2 O 3 (Mn-Cu-Ce/Al 2 O 3 ) catalyst was prepared by an impregnation-calcination method and investigated in the catalytic ozonation treatment of real coal chemical wastewater (CCW). The catalyst was characterized by XRD, SEM, TEM, XRF, BET, and XPS techniques. The results showed that Mn, Cu, and Ce metal oxides were evenly distributed on the Al 2 O 3 surface and the catalyst maintained a large surface area and a high pore volume compared with the pristine Al 2 O 3 . The synergy between Mn, Cu, and Ce oxides greatly enriched the catalytic active sites and enhanced the ozonation performance. The catalytic ozonation process with Mn-Cu-Ce/Al 2 O 3 increased the removal rate of total organic carbon (TOC) by 31.6% compared with ozonation alone. The ketones, aromatic compounds, phenols, and nitrogen-containing heterocyclic compounds in CCW have been effectively degraded and mineralized by Mn-Cu-Ce/Al 2 O 3 catalytic ozonation process, and its biodegradability has also been significantly improved. The experimental results of ∙OH scavengers revealed that the mechanism of Mn-Cu-Ce/Al 2 O 3 catalytic ozonation was to promote the generation of ∙OH radicals. The catalytic activity of Mn-Cu-Ce/Al 2 O 3 was only a slight decrease in six consecutive catalytic ozonation treatments, showing good stability. Therefore, Mn-Cu-Ce/Al 2 O 3 can be used as a candidate catalyst for the advanced treatment of refractory organic wastewaters upon catalytic ozonation.
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高影响因子
International Journal of Applied Ceramic Technology
·
2018
·Vol. 15
·期 6
·1490-1501
·
IF 1.165
Xiangli Kong,Minghui Qiu,Anran Wang,Lu Yang,Rongfei Zhou,Yiqun Fan,Deshuang Kong,Changjun Gu
The adhesion and cohesion between the coating layers and the ceramic honeycombs are usually one of the key issues in the preparation of high-performance zeolite-based/Monolith catalysts. In this work, we investigate the deposition of high-efficiency Cu-SAPO-34 catalyst on a cordierite monolith with special focus on the impact of alumina binders on the structure, mechanical adhesion and cohesion, and catalytic performance of the monolithic catalyst. Two kinds of alumina nanoparticles, α-alumina and γ-alumina, have no significant impacts on the Cu-SAPO-34 crystal structure, micropore morphology and catalytic activity. But washcoating experiments showed that the mass loss rate of the coating was less and the loading of the catalyst was higher when α-alumina was used as the binder. The reason of improving the adhesion and cohesion strength is the suitable thermal shrinkage, the uniform distribution and densification structure of α-alumina. Furthermore, optimization of the coating formulation with α-alumina as the binder has been performed. Finally, the catalyst prepared under the optimal conditions was tested by SCR and a maximum conversion rate of 97.4% was obtained. It was concluded that the use of the washcoating method with α-alumina does not affect catalytic performance while it increases bonding strength between substrate and catalysts.
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高影响因子
DALTON TRANSACTIONS
·
2023
·Vol. 52
·期 23
·8142-8154
·
IF 4
You-Hui Zhao,Hai-Yan Li,David James Young,Xiangqian Cao,Da-Liang Zhu,Zhi-Gang Ren,Hong-Xi Li
Earth-abundant copper(I) coordination complexes of an imine-phosphine and a diimine have been developed as visible-light photocatalysts. Reaction of [Cu(MeCN)4]BF4 with hetero-bidentate phosphinopyrazole (phpz) ligand R1R2C3HN2PPh3 (R1 = R2 = H (1a); R1 = H, R2 = Me (1b); R1 = H, R2 = Ph (1c); R1 = R2 = Me (1d)) and 2,9-dimethyl-1,10-phenanthroline (dmp) gave four heteroleptic bis-chelate Cu(I) complexes [Cu(dmp)(R1R2C3HN2PPh3)]BF4 (R1 = R2 = H (2a); R1 = H, R2 = Me (2b); R1 = H, R2 = Ph (2c); R1 = R2 = Me (2d)) with distorted tetrahedral geometries. Complexes 2a–2d exhibited broad absorption in the visible spectrum and could facilitate photochemical intermolecular atom-transfer radical addition reactions of CBr4, or CCl3Br, CHI3 to styrenes in yields up to 91% and with a broad substrate scope. The absorption, emission, redox potential and photocatalytic activity were dependent on the substituents on the phpz ligand. Mechanistic studies supported an atom-transfer radical addition (ATRA) mechanism.
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DOI
高影响因子
ANALYTICA CHIMICA ACTA
·
2018
·
IF 5.123
Ruifeng Peng,Haibo He,Qian Wang,Xiaoxia Yan,Qiongwei Yu,Haixiao Qin,Yunyi Lei,Liqiang Luo,Yuqi Feng
In this study, we proposed a novel anti-aggregation of gold nanoparticles (AuNPs) strategy for colorimetric sensing of iodide ions (I − ) regulated by the redox reaction between the target ions and the ion cross-linking agent. Cu 2+ as interlinking ion can induce aggregation of arginine capped AuNPs (Arg-AuNPs) due to the formation of Arg-Cu 2+ -Arg analogous structure resulting from the chelation between Cu 2+ and arginine, with a clear color change of solution from red to blue. In the presence of I − , however, Cu 2+ would be readily reduced owing to the formation of CuI, AuNPs underwent a transformation from an aggregation to a dispersion state depending on the concentration of I − , leading color changes from blue to red. The corresponding color variation in the process of anti-aggregation of AuNPs can be monitored through UV–vis spectrophotometer or by the naked-eye, making quantitative analysis of I − feasible in a convenient colorimetric or visual way. The assay only took 5 min, showing high sensitivity with a lowest detectable concentration of 10 nM and excellent selectivity for I − over other anions tested, which was successfully applied for the detection of I − in drinking water and table salt samples.
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高影响因子
ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
·
2018
·
IF 3.974
Xiaofeng Yi,Fuliang Sun,Zhenhua Han,Fuhao Han,Jiarui He,Minrui Ou,Junjie Gu,Xiaoping Xu
In this work, a novel sodium alginate (SA)/polyvinyl alcohol (PVA)/graphene oxide (GO) hydrogel microspheres were prepared by a simple method. Sodium alginate was physically crosslinked by Ca 2+ ; GO was encapsulated into the composite to strengthen the hydrogels; PVA played a significant role in well dispersing of GO in SA. The SA/PVA/GO (SPG) hydrogels were employed as an efficient adsorbent for removal of Cu (II) and U (VI) from aqueous solution. Batch experiments with the subject of the pH, initial metal ion concentration , competing ions and contact time were investigated. Structure characterization was successfully conducted by FTIR, SEM, EDX, BET and XPS. Furthermore, the sorption kinetics of Cu 2+ and UO 2 2+ followed pseudo-second order model and exhibited 3-stage intraparticle diffusion model. Equilibrium data were best described by Langmuir model and the obtained maximum adsorption capacities of SPG hydrogel microspheres for Cu 2+ and UO 2 2+ were 247.16 and 403.78 mg/g, respectively. The difference in adsorption capacity can be confirmed by the percentage of elements in EDX spectra and the intension of peak of elements in XPS spectra. The SPG sorbent exhibited excellent reusability after 5 adsorption-desorption cycles. All results suggested that the prepared adsorbents could be considered as effective and promising materials for removal of Cu (II) and U (VI) in wastewater.
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高影响因子
危险品化学品经营许可证（带存储）