COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Xiaojiao Kang,Tianyu Gao,Wei Lü,Ming Jiang,Hongbo Zhu,Hongcheng Wang
Ternary I-III-VI quantum dots (QDs) are promising substitutions to Pb and Cd chalcogenide QDs in various applications such as LED, biodetection and sensing. It is urgent to explore near-infrared (NIR) emitting QDs with the advantages of low-cost synthesis and nontoxicity. Herein, water-soluble NIR Cu-In-S/ZnS (CIS/ZnS) QDs were obtained utilizing thioglycolic acid (TGA) and polyethyleneimine (PEI) as the stabilizing molecules in a commercial pressure cooker. Moreover, we detailedly investigated the influence factors on the PL property of CIS QDs and CIS/ZnS QDs including species of sulfur source, reaction time, pH, the dosage of TGA, PEI, Na 2 S, number of ZnS coating layers and the molar ratio of Cu/In. These QDs with adjusting Cu/In ratios show the emission maximum in the range of 710–750 nm. The maximum PL quantum yield (PLQY) of 20 % was acquired for CIS/ZnS QDs with a Cu/In ratio was 0.33/1 and three ZnS layer coating. Finally, we fabricated a NIR pc-LED lamp by using blue LED chips and CIS/ZnS QDs. The device shows a broadband NIR emission centered at 770 nm, which can be applied in night-vision system.
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DOI
高影响因子
ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Mingyue Xie,Yong Wu,Hao Gu,Yuhao Peng,Shan Zhang,Feng Ryan Wang,Wei Xiao,Dong Gu
Deuterated compounds have broad applications across various fields, with dehalogenative deuteration serving as an efficient method to obtain these molecules. However, the diverse electronic structures of active sites in the heterogeneous system and the limited recyclability in the homogeneous system significantly hinder the advancement of dehalogenative deuteration. In this study, we present a catalyst composed of copper single-atom sites anchored within an ordered mesoporous nitrogen-doped carbon matrix, synthesized via a mesopore confinement method. The Cu1/OMNC-1100 catalyst, characterized by Cu–N4 sites, demonstrates exceptional performance, high functional group tolerance, and remarkable durability in the deuteration of 2-bromo-6-methoxynaphthalene under relatively mild conditions (80 °C, 2 MPa of CO). Experimental results combined with X-ray absorption fine structure analysis reveal that Cu–N3 sites can be converted into more stable Cu–N4 counterparts at higher pyrolysis temperatures, resulting in enhanced catalytic activity. This work demonstrates a strategy for designing single-atom site catalysts with tunable coordination environments, providing a promising approach to improving catalytic performance in selective dehalogenative reactions under relatively mild conditions.
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DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Xiawei Zhao,Rui Liu,Tiantian Tang,Zihao Liu,Xiaozhi Liu,Kai Yu,Ye Zhang,Hao Wang
Drug-resistant bacterial infections and biofilm formation have long posed significant challenges to public health, particularly in the context of chronic wound healing. In this study, the CuHspMOF were derived from copper and hesperitin (Hsp). The photocurable Epsilon-poly-l-lysine (EPLMA) and blueberry anthocyanin (BA) were synthesized through free radical polymerization. The multifunctional EB@CuHsp hydrogel exhibits excellent photothermal effect. One of the key features of the EB@CuHsp hydrogel is its ability to monitor the healing environment through color changes in response to variations in pH. This property allows for real-time assessment of the wound’s pH levels, reflecting the body fluid’s pH range during the healing process (pH 5–9). The hydrogel components work synergistically to facilitate wound healing. The EPLMA, with its positively charged, could captures bacteria and enable copper ions to eradicate bacteria at lower concentrations. This dual action leads to the creation of an optimal healing environment conducive to wound healing. During the inflammatory phase, BA and Hsp could collaborate to combat inflammation, which transited from the inflammatory stage to the proliferative phase soon. Continuous release of BA and Cu 2+ , coupled with thermotherapy, significantly enhances epithelial and blood vessel regeneration, thereby expediting the healing of chronic wounds. Overall, this multifunctional composite hydrogel holds great promise for promoting the regeneration of infected wound tissue, making it a potential candidate for chronic wound dressings.
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高影响因子
MACROMOLECULES
·
2021
·
IF 5.985
Sikai Chen,Ze-Lian Zhang,Fei Song,Xiu-Li Wang,Yu-Zhong Wang
Facing the limitation of weak compatibility on the use of cellulose nanofiber (CNF) as a reinforcement in polymer matrix nanocomposites, this work developed an alternative approach to fabricating a series of one-component CNF-reinforced nanocomposites by grafting polyacrylates from CNF via surface-initiated Cu(0)-mediated reversible deactivation radical polymerizations. An initiator group was initially introduced onto the surface of CNF through one-step esterification. Then, graft polymerization of methyl acrylate and n-butyl acrylate was carried out to obtain polyacrylate-grafted CNF. The graft polymerization exhibited several advantages, including simplicity, rapidity, and effectivity. A high graft ratio (up to 3000%) was obtained at room temperature after 3 h. The graft ratio was controlled by regulating the monomer concentration and reaction time. Characterizations confirmed that the chemical, morphological, and crystalline structure of CNF was maintained after surface modification and grafting. The uniform morphology and moderated transparency of solvent-casting polyacrylate-grafted CNF films proved the superior homogeneity of these nanocomposites. Tensile experiments revealed that poly(methyl acrylate)-grafted CNF nanocomposites had remarkable mechanical properties (tensile strength = 13.6–25.3 MPa; break elongation = 48.8–179.9%), contributing to an outstanding dispersity. By alternating the graft ratio, the mechanical behavior of the nanocomposite could transition from tough to ductile. This grafting approach has been proven to be a powerful tool for the design of CNF-reinforced nanocomposites for various purposes.
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高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2020
·
IF 7.1
Dandan Hu,Tianyu Zhan,Zhiyong Guo,Sui Wang,Yufang Hu
A novel dual-modality readout biosensing method is developed for Cu(II), coenzyme (CoA) and histone acetyltransferase (HAT) analysis based on an electrosynthesized tris(bipyridine)ruthenium(II)-functionalized metal-organic framework (Ru-MOF). In this protocol, the Ru-MOF with a delicate structure serves as both an electrochemiluminescent (ECL) and fluorescent (FL) probe. Interestingly, Cu(II) can hinder the two distinct processes favorably, thus realizing bidirectional detection of Cu(II) via an “on-off” method. Simultaneously, CoA, which contains a sulfhydryl group, can ignite a reverse “off-on” process due to the polymeric interaction of CoA and Cu(II) (2: 1). Similarly, abundant CoA molecules could also be generated regularly by a typical HAT p300-driven acetylation reaction, hence accomplishing HAT p300 activity analysis. Subsequently, an ingenious “on-off” route is exhibited again by the introduction of some small molecules (including anacardic acid and C646), which present an inhibiting effect on HAT p300 activity. Furthermore, quantitative analysis of Cu(II), CoA and HAT p300 (ECL/FL) is achieved brightly with detection limits of 0.19/0.76 nM, 1.3/6.5 nM and 1.5/8.8 nM, respectively. Ultimately, this two-channel biosensor with excellent analytical performance is applied successfully in real samples, demonstrating its potential use in bioanalysis.
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高影响因子
WATER RESEARCH
·
2019
·
IF 7.913
Wei Xiang,Tao Zhou,Yifan Wang,Mingjie Huang,Xiaohui Wu,Juan Mao,Xiejuan Lu,Beiping Zhang
This study has demonstrated that hydroxylamine (HA) could greatly enhance Cu nanoparticles (nCu) in activating molecular oxygen and significantly elevate the diclofenac (DCF) degradation rate about two orders of magnitude in neutral circumstances. Effects of several important parameters on the DCF degradation such as nCu loading, HA dosage, pH and reaction temperature were investigated in the nCu/HA/O 2 system. Multiple examinations revealed that the reactive Cu(III) species instead of OH• would be predominant in the nCu/HA/O 2 system, despite their similar DCF degradation pathways. Based on a HA-enhanced copper cycle depending on the pristine Cu 0 @Cu(I) (hydro)oxides core-shell structure, the heterogeneous-homogeneous reaction mechanism was proposed. It included solid-liquid interfacial and bulk reactions, e.g. heterogeneous activation of O 2 by Cu(I) to produce H 2 O 2 and homogeneous Cu(I)-catalytic generation of Cu(III) from H 2 O 2 . Further quantitative investigation of the main reactive species in the cycle revealed that the Cu(I) regeneration instead of the O 2 activation would be rate-limited. Besides, nCu could be recycled to effectively degrade DCF in four consecutive cycles in the raw neural nCu/HA/O 2 system. It suggested that the nCu/HA/O 2 system with a more efficient copper cycle would be a good alternative Fenton-like system in treating neutral recalcitrant organic wastewaters.
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DOI
PubMed
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2022
·
IF 5.876
En-Hui Yuan,Meng Li,Ming-Hui Yang,Xiaosheng Huang,Kun Zhang,Weiliang Han,Zhicheng Tang,Zhong-Wen Liu
A direct hydrothermal synthesis strategy is developed to prepare the Cu–Fe-ZSM-5 zeolites by using the ethylenediaminetetraacetic acid disodium dihydrate (EDTA-2Na·2H 2 O) chelated Cu 2+ and Fe 3+ precursors as metal sources. During the crystallization, the metal chelates were spontaneously embedded into the ZSM-5 crystals and subsequently transformed to the zeolites encapsulated copper and iron species after removing the chelating agent via the high-temperature calcination . Rigorous characterizations indicate that the resulted Cu 2+ /Cu + and Fe 3+ /Fe 2+ species are formed ultra-small nano-composites with an average diameter of ∼2.2 nm and highly dispersed in the ZSM-5 zeolite crystals. The acidity of the ZSM-5 zeolites is subtly modulated by the encapsulated Cu–Fe nano-composite. As expected, the as-prepared Cu–Fe-ZSM-5 exhibits outstanding catalytic performance for the selective catalytic reduction of NO x with ammonia (NH 3 -SCR) in the broad reaction temperature ranges of 220–480 °C, which is much better than the Cu–Fe/ZSM-5 prepared with the conventional wetness impregnation method. Furthermore, the resultant zeolites show high stability and good tolerance to H 2 O and SO 2 , and it is very competitive for practical application to eliminate NO x . The developed one-pot hydrothermal synthesis route by using EDTA-2Na·2H 2 O as chelating agent is very convenient and easily reproducible, providing a general guideline to design and fabricate the superior transition metal modified zeolite catalysts for NH 3 -SCR and the related reactions.
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高影响因子
ELECTROCHIMICA ACTA
·
2014
·
IF 4.086
Qian-Li Zhang,Jie-Ning Zheng,Tian-Qi Xu,Ai-Jun Wang,Jie Wei,Jian-Rong Chen,Jiu-Ju Feng
A simple, facile, and one-pot solvothermal strategy was developed to prepare Pd-on-Cu nanoparticles evenly distributed on reduced graphene oxide (Pd-on-Cu/RGO) in ethylene glycol systems, using cetyltrimethylammonium bromide (CTAB) as a structure-directing agent. Control experiments were demonstrated the critical role of CTAB and GO to the final morphology. The as-prepared nanocomposites exhibited the enlarged surface area of 64.98 m 2 g −1 Pd, improved electrocatalytic activity, and better stability for ethanol oxidation in alkaline media, which can serve as promising anode catalysts in direct alcohol fuel cells.
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高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2022
·
IF 6.633
Shujun Huang,Xinyan Chen,Yu Lei,Wanting Zhao,Jipeng Yan,Jian Sun
Laccase is a very promising natural enzyme in the application of biochemical industry, but its application is severely limited by its high cost and poor stability. To overcome the inherent defects of natural laccase, here, we prepared a new type of small-size mimicking nanozymes based on self-assembly of bovine serum albumin (BSA) and copper sulfate (CuSO 4 ) with help of ionic liquid (IL). The effects of different ILs on the catalytic activity of the product (BSA-Cu nanozymes) were investigated, and it was found that BSA-Cu nanozymes with stable structures could be obtained in tetrabutylammonium hydroxide (TBAOH). Compared with laccase, the V max /K m of BSA-Cu nanozymes prepared by TBAOH was higher (0.081) than that of laccase (0.029), and the stability of BSA-Cu nanozymes were significantly enhanced in terms of pH, temperature, and ionic strength. The BSA-Cu nanozymes were utilized for detection and degradation of a series of phenolic substances, among which catechol was the most effective. In the detection of epinephrine, BSA-Cu nanozymes achieved a lower detection limit (0.38 µg/mL) and were more sensitive than laccase (3.53 µg/mL). The application of ILs can improve the mimicking laccase nanozymes performance and has great potential for further industrial application.
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DOI
高影响因子
MICROCHIMICA ACTA
·
2012
·Vol. 180
·期 3
·219-226
·
IF 3.033
Jiang Xiujuan,Huang Lingman,Liu Xiaoming
Magnetic nanoparticles (MNPs) coated with silica gel were prepared, then functionalized with a tridentate ligand via a silane coupling agent (3-chloropropyl)triethoxysilane, and finally loaded with Cu(II) ions. The resulting materials were characterized by TEM, SEM, XRD, FTIR and TGA techniques. They display strong affinity for BSA with an adsorption capacity as high as 235 mg g −1 and with a fast (30 min) establishment of adsorption equilibrium. Repetitive adsorptions (6 times) hardly affect the adsorption capability. The kinetics and isotherm of the adsorption of BSA were also investigated.
Core-Shell magnetic nanoparticles functionalised with tridentate ligand BPA which binds Cu(II) were prepared. The materials adsorb BSA with high adsorption capacity (235 mg g −1 ) and fast establishment of adsorption equilibrium (30 min). Repetitive adsorption-desorption (6 times) did not affect significantly the adsorption capacity.
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高影响因子
Nano Research
·
2014
·Vol. 7
·期 11
·1581-1591
·
IF 6.963
Guo Weisheng,Yang Weitao,Wang Yu,Sun Xiaolian,Liu Zhongyun,Zhang Bingbo,Chang Jin,Chen Xiaoyuan
Inorganic nanoparticles have been introduced into biological systems as useful probes for in vitro diagnosis and in vivo imaging, due to their relatively small size and exceptional physical and chemical properties. A new kind of colortunable Gd-Zn-Cu-In-S/ZnS (GZCIS/ZnS) quantum dots (QDs) with stable crystal structure has been successfully synthesized and utilized for magnetic resonance (MR) and fluorescence dual modality imaging. This strategy allows successful fabrication of GZCIS/ZnS QDs by incorporating Gd into ZCIS/ZnS QDs to achieve great MR enhancement without compromising the fluorescence properties of the initial ZCIS/ZnS QDs. The as-prepared GZCIS/ZnS QDs show high T
1 MR contrast as well as “color-tunable” photoluminescence (PL) in the range of 550–725 nm by adjusting the Zn/Cu feeding ratio with high PL quantum yield (QY). The GZCIS/ZnS QDs were transferred into water via a bovine serum albumin (BSA) coating strategy. The resulting Cd-free GZCIS/ZnS QDs reveal negligible cytotoxicity on both HeLa and A549 cells. Both fluorescence and MR imaging studies were successfully performed in vitro and in vivo . The results demonstrated that GZCIS/ZnS QDs could be a dual-modal contrast agent to simultaneously produce strong MR contrast enhancement as well as fluorescence emission for in vivo imaging.
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DOI
PubMed
高影响因子
CARBOHYDRATE POLYMERS
·
2016
·
IF 4.219
Binyan Huang,Yunguo Liu,Bin Li,Shaobo Liu,Guangming Zeng,Zhiwei Zeng,Xiaohua Wang,Qimeng Ning,Bohong Zheng,Chunping Yang
Fe 3 O 4 @SiO 2 -Chitosan/GO (MSCG) nanocomposite was investigated by various techniques (SEM, TEM, XRD, VSM, FT-IR, XPS) for the removal of tetracycline (TC). Effects of pH, zeta potential and initial contaminant concentration were studied in detail. Four background cations (Na + , K + , Ca 2+ and Mg 2+ ) with a concentration of 0.01 M showed little influence on the TC adsorption at the studied pH range while the divalent heavy metal cation Cu(II) could significantly enhance the adsorption. The results indicated that the highest adsorption capacity of TC were 183.47 mmol/kg and 67.57 mmol/kg on MSCG with and without Cu(II), respectively. According to mechanism investigation for the adsorption of TC by pH impact study and XPS analysis, besides electrostatic interaction and π–π interactions, the Cu(II) also acts as a bridge between TC and MSCG, which significantly improve the adsorption of TC. This study provided valuable guidance and effective method for the removal of TC from aquatic environments.
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PubMed
高影响因子
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