Biomaterials Science
·
2022
·Vol. 11
·期 1
·322-338
·
IF 7.59
Jianwen Zhang,Xianlan Ke,Maotao Huang,Xinyu Pei,Shuai Gao,Dimeng Wu,Junying Chen,Yajun Weng
The anticoagulation and antibacterial functions of implant and interventional catheters during indwelling will determine their success or failure. Here, an amino-containing copper-based metal–organic framework (Cu-MOF) coating was prepared on the thermoplastic polyurethane substrate (TPU) surface by spin coating for anti-thrombotic and anti-infection effects. The adhesion properties of the polyurethane prepolymer coating (PC) enhanced the binding force of Cu-MOF particles and TPU surface and improved stability. Due to the coordination affinity of Cu2+ with nitric oxide (NO) and the NO loading capacity of the amino group, it showed that a large amount of NO was loaded in the coating. Meanwhile, the coordinated Cu2+ in the coating also catalyzed endogenous NO donors to generate NO, which prolonged the NO release for up to 30 days. The results of antibacterial experiments showed that the NO released from the coating had good antibacterial effects on both E. coli and S. epidermidis. An obvious antibacterial ring can be seen and the antibacterial rate was higher than 96%. It also showed inhibiting platelet adhesion and activation, prolonged in vitro clotting time and inhibited thrombus formation. In summary, for the first time, NO release from the coating was realized by the combined ways of NO donor and catalytic endogenous NO donor. It can not only meet the high NO release rate required for early anticoagulation and antibacterial of the catheter but also maintain normal anticoagulation requirements in the later period.
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Polymers
·
2022
·Vol. 14
·期 22
·4888
·
IF 4.967
Jia Qu,Hongpu Huang,Qiang Yang,Wei Gong,Meilan Li,Liangliang Chang,Baoyue Cao,Guochun Zhang,Chunsheng Zhou
Water pollution is a worldwide problem that requires urgent attention and prevention and exceeding use of heavy-metal ions is one of the most harmful factors, which poses a serious threat to human health and the ecological environment. In this work, a magnetic oxidized micro/mesoporous carbon (MOMMC) was prepared for the easy separation of Cu(II) and Pb(II) from water. The dual-template method was used to prepare micro/mesoporous carbon using sucrose as the carbon source, silica nanoparticles formed by tetraethyl orthosilicate as the microporous templates, and triblock copolymer F127 as the mesoporous template. MOMMC was obtained by oxidation using potassium persulfate and then magnetized through in situ synthesis of Fe3O4nanoparticles. FTIR, TG-DSC, XRD, TEM, SEM, nitrogen adsorption–desorption isotherms, zeta potential, and VSM were used to confirm the synthetic process, structure, and basic properties of MOMMC. The high-saturation magnetization (59.6 emu·g−1) of MOMMC indicated its easy and fast separation from water by an external magnetic field. Kinetics studies showed that the adsorption of Cu(II) and Pb(II) on MOMMC fit the pseudo-second-order model well. Isotherm studies showed that the adsorption behavior of Cu(II) was better described by the Langmuir model, and the adsorption behavior of Pb(II) was better described by both Langmuir and Redlich–Peterson models. MOMMC obtained efficient adsorption for Cu(II) and Pb(II) with the large adsorption capacity of 877.19 and 943.40 mg·g−1according to the Langmuir adsorption isotherm equation, and a better selectivity for Pb(II) was observed in competitive adsorption. MOMMC still possessed a large adsorption capacity for Cu(II) and Pb(II) after three adsorption–desorption cycles. These findings show that MOMMC represents an excellent adsorption material for the efficient removal of heavy-metal ions.Keywords:magnetic mesoporous carbon;adsorption;copper;lead;adsorption kinetics;adsorption isotherms;selectivity
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2022
·
IF 7.139
Pei Qiu,Mengjie Lu,Gang Cheng,Wei Li,Lijun Liu,Jinyan Xiong
Semiconductor photocatalysis serves a green technique to convert solar energy to sustainable hydrogen energy through water splitting. TiO 2 has attracting increasing interest and much effort has been paid on addressing the suffered drawbacks of solar energy utilization limitation and electron-hole recombination. In this work, simultaneously involving of oxygen vacancy and Cu into TiO 2 nanoparticles has been achieved through self-reduction of Cu 2 O and self-transformation of Ti-precursor from Cu 2 O@Ti-precursor in ethylene glycol-water medium. The Cu@TiO 2-x hybrids show improved photocatalytic H 2 production, and the Cu@TiO 2-x -1% sample has H 2 evolution rate of 7218.8 μmol g −1 h −1 , which is 2.1 times higher than that of TiO 2-x . It is proposed that the involving of metallic copper and oxygen vacancy by this solvothermal approach can enhance light absorption, promote electron-hole pairs separation and charge transfer, and increase active sites of TiO 2 nanoparticles, resulting in synergetic effect for hydrogen production improvement.
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MOLECULES
·
2022
·Vol. 27
·期 19
·6385
·
IF 4.927
Chengzhi Yu,Libin Zheng,Yongyuan Hong,Jiabin Chen,Feng Gao,Yalei Zhang,Xuefei Zhou,Libin Yang
Advanced oxidation processes (AOPs) demonstrate great micropollutant degradation efficiency. In this study, CuFe2O4was successfully used to activate peracetic acid (PAA) to remove Rhodamine B. Acetyl(per)oxyl radicals were the dominant species in this novel system. The addition of 2,4-hexadiene (2,4-HD) and Methanol (MeOH) significantly inhibited the degradation efficiency of Rhodamine B. The ≡Cu2+/≡Cu+redox cycle dominated PAA activation, thereby producing organic radicals (R-O˙) including CH3C(O)O˙ and CH3C(O)OO˙, which accounted for the degradation of Rhodamine B. Increasing either the concentration of CuFe2O4(0–100 mg/L) or PAA (10–100 mg/L) promoted the removal efficiency of this potent system. In addition, weakly acid to weakly alkali pH conditions (6–8) were suitable for pollutant removal. The addition of Humid acid (HA), HCO3−, and a small amount of Cl−(10–100 mmol·L−1) slightly inhibited the degradation of Rhodamine B. However, degradation was accelerated by the inclusion of high concentrations (200 mmol·L−1) of Cl−. After four iterations of catalyst recycling, the degradation efficiency remained stable and no additional functional group characteristic peaks were observed. Taking into consideration the reaction conditions, interfering substances, system stability, and pollutant-removal efficiency, the CuFe2O4/PAA system demonstrated great potential for the degradation of Rhodamine B.Keywords:peracetic acid (PAA);rhodamine B;copper ferrite (CuFe2O4);organic radicals (R-O˙)
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ANALYTICA CHIMICA ACTA
·
2022
·
IF 6.911
Qinqin Yang,Xipeng Cui,Ying Qin,Tiantian Lei,Yu He,Gongwu Song
MXene-based nanozymes have increased research enthusiasm in the field of food safety and environment monitoring. Herein, the Cu NCs/Ti 3 C 2 NSs nanocomposites were prepared by modifying copper nanoclusters (Cu NCs) on the surface of Ti 3 C 2 nanosheets (NSs) with a simple two-step method. The Cu NCs/Ti 3 C 2 NSs nanocomposites had outstanding tetraenzyme mimic activities, i.e. peroxidase (POD)-mimics, catalase (CAT)-mimics, ascorbic acid oxidase (AAO)-mimics and superoxide dismutase (SOD)-mimics. Modification of Cu NCs on Ti 3 C 2 NSs can enhance tetraenzyme mimic activities because of the synergistic catalytic effect between Cu NCs and Ti 3 C 2 NSs. The catalytic mechanism and steady-state kinetics of Cu NCs/Ti 3 C 2 NSs were also investigated. Based on the POD-mimic activity of Cu NCs/Ti 3 C 2 NSs, a simple and rapid colorimetric method was established for the on-site detection of hypoxanthine (Hx), with the linear range of 5–200 μM and limit of detection (LOD) was 0.25 μM. The visible color change with the increase of Hx concentration can be recognized by a smartphone APP to transfer the red (R), green (G) and blue (B) value for the quantitative analysis of Hx, with the linear range of 10–200 μM, which provided a convenient method for the real-time detection of Hx. This work not only provides a significant route to fabricate nanocomposite with outstanding tetraenzyme mimic activities but also offers a low-cost and rapid method for monitoring the freshness of aquatic products.
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CHEMICAL PHYSICS LETTERS
·
2022
·
IF 2.719
Tianjia Cheng,Yahui Zhang,Fengjiao Cui,Gang Jiang,Peizu Liu,Jing Guo,Kai Cui,Chen Chen,Huidong Li
A novel adsorbent (ZIF-8 cattail cellulose aerogel, ZCCA) with excellent adsorption performance was prepared using cellulose as a dispersant of ZIF-8 and applied to Cu(II) removal from wastewater. ZCCA showed an irregular network structure, which was uniformly filled with ZIF-8 particles. Its adsorption mechanism was the electrostatic attraction and chemical coordination of Cu(II). This adsorption process followed the Pseudo-second-order kinetics and the Langmuir isotherm model. The maximum adsorption capacity was 270.2 mg⋅g −1 at 303 K. In addition, the removal efficiency remained 83 % after 5 adsorption–desorption cycles. ZCCA showed outstanding adsorption performance and high potential in practical application.
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JOURNAL OF APPLIED ELECTROCHEMISTRY
·
2022
·Vol. 52
·期 11
·1617-1628
·
IF 2.925
Chen Jinyang,Huang Xiaozhou,Ye Ruihong,Huang Dihui,Wang Yanjun,Chen Sheng
A series of conductive metal–organic frameworks (M-CATs) were synthesized using 2,3,6,7,10,11-hexahydroxytriphenylas a ligand following a solvothermal method, and the Cu-CAT system exhibiting the best performance was identified. Conductive Cu-CAT-anchored reduction graphene oxide composites (Cu-CAT@rGO) were prepared following a hydrothermal method. The microstructures of the systems were further characterized using X-ray diffraction, scanning electron microscopy, energy dispersion spectroscopy, and transmission electron microscopy techniques. The drip-casting membrane method was used for the fabrication of a novel electrochemical sensor based on the conductive Cu-CAT-anchored rGO (Cu-CAT@rGO/GCE). The electrochemical performance of Cu-CAT@rGO/GCE was studied using electrochemical impedance spectroscopy and cyclic voltammetry techniques. The differential pulse voltamme try technique was used for electrochemical sensing to detect the content of bisphenol A (BPA) in beverage bottles. An excellent linear detection range (0.05–100 µmol L −1 ) and a low detection limit (4.9 nmol L − 1 ; based on S/N = 3) were recorded. Therefore, this method can potentially be used to develop a new route for the detection of BPA. Graphical abstract
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Biomedical Materials
·
2022
·Vol. 17
·期 5
·055008
·
IF 4.103
Zini Liu,Xueqi Chen,Chen Li
Asymmetrical dressings, which are composed of a compact top layer and a porous bottom layer, are commonly used to mimic the characteristics and structure of the epidermis and dermis layers, and overcome the flaws of traditional dressings such as wound dryness and bacterial penetration. Herein, a bio-inspired double-layer asymmetric wettable wound dressing was prepared by low-temperature 3D printing coupled with electrospinning technology. The hydrophobic top layer of poly(caprolactone)(PCL) film produced by electrospinning was used to simulate the compact and air-permeable epidermis. The hydrophilic bottom layer of the dressing, a scaffold composed of chitosan and copper ions doped Laponite (Cu@CS-Lap) was used to kill bacteria and speed up wound healing. Additionally, the composite dressings also showed excellent cytocompatibility and antibacterial properties in vitro experiments. The migratory area of Cu-doped group human umbilical vein endothelial cells increased by about 48.19% compared to the control group, as revealed by the results of the cell scratch experiment. Furthermore, in vivo experiments in rats showed that wound closure at the 0.5Cu@CS5-PCL dressing reached 98.24% after 12 days, indicating the enormous potential of asymmetric double dressings in boosting wound healing.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2022
·
IF 4.831
Ningning Zhang,Lixin Zhao,Mengting He,Peng Luo,Liang Tan
A highly sensitive and selective sensor for the quantitative assay of inorganic pyrophosphatase (PPase) activity was developed based on a fluorescence “turn–off” strategy. Carbon quantum dots@Cu(II)-based metal–organic framework nanotubes (CQDs@Cu-MOF) with length less than 300 nm and width less than 20 nm were synthesized. CQDs in the nanotubes exhibited weak fluorescence owing to static quenching. The coordination reaction between pyrophosphate ion (PPi) and Cu(II) decomposed CQDs@Cu-MOF and led to the release of CQDs, of which the fluorescence recovered. In the presence of PPase, the hydrolysis of PPi generated phosphate ion (Pi). CQDs@Cu-MOF remained their structural stability and the fluorescence turned off. The fluorescence intensity difference of the mixture of CQDs@Cu-MOF and PPi in the absence and presence of PPase (-Δ F ) was proportional to the PPase concentration from 0.1 to 5 mU mL −1 and that from 5 to 50 mU mL −1 , and a limit of detection at 0.03 mU mL −1 was obtained. PPase activity in human serum was analyzed using the proposed fluorescence sensor and the recovery values were found to vary from 95.0% to 104 %.
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APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Junkai Wang,Xiangtao Huo,Furong Yan,Haolei Wang,Mei Zhang,Min Guo
In this study, a novel bifunctional lamella self-assembled nanosheet arrays of Cu-doped NiO electrode was hydrothermally synthesized to improve and balance its electrochromic-energy storage performance. When Cu doping amount was 1%, the as-prepared nanostructured electrode exhibited both excellent electrochromic properties including large optical modulation (77.1% at 550 nm) and long stability (98.3% retention of maximum optical modulation after 4000 cycles), and good capacitive properties, especially high area specific capacitance (94.7 mF/cm 2 at 0.2 mA/cm 2 ) as well as excellent capacitance stability (100% at 50 mV/s for 2000 cycles; 80.6% retention at 0.8 mA/cm 2 for 5000 cycles). These excellent properties may benefit from the large active specific surface area and low charge transport resistance. Meanwhile, the self-assembled structure and cross-linked nanosheets optimize the structural stability of the film. Notably, an electrochromic-energy storage device (EESD) was constructed and demonstrated excellent electrochromic-energy storage performance. In charging process, two integrated EESDs in series turned into dark brown and an LED was lit up. While, in discharging process, the EESD gradually became colorless and the LED went out. This study may point out the direction for developing new visualized energy storage devices.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Ying Han,Qingjie Lu,Weiwei Li,Yaping Guo,Yue Wu,Hongyuan Liu,Xiaoping Zheng,Yanhong Gao
Diclofenac (DCF) is one kind of pharmaceuticals and personal care products (PPCPs), and it is imperative to develop a green and efficient method to remove it. The removal of DCF with zinc (Zn) in the presence of Cu(II) and Co(II) were investigated on the influence factors, products, and mechanism. The results showed that with the increasing of Cu(II) and Co(II) concentrations, the reactions were accelerated. The removal rate was higher with lower pH value. In all the systems, the DCF removal rate hardly changed when the dissolved oxygen (DO) concentration was 0–8 mg·L −1 and increased at 20 mg·L −1 . Products analysis showed that the products were hydroxylated DCF (DCF 0 ) and an unknown product (DCF u ) in Zn system, monochlorinated DCF (DCF 1 ) in Zn/Cu(II) system, DCF 1 and dechlorinated DCF (DCF 2 ) in Zn/Co(II) system. The order of toxicity from highest to lowest was DCF, DCF 0 , DCF 1 , DCF 2 . The corrosion degree of zinc powder surface increased in the presence of Cu(II) and Co(II). After 48 h, ZnO formed in Zn system. In Zn/Cu(II) system, CuO and Cu 2 O formed in addition to ZnO. In the Zn/Co(II) system, Co 3 O 4 , ZnO and Zn(OH) 2 formed. After adding Cu(II) and Co(II), the corrosion currents increased. In Zn/Cu(II) system, DCF was dechlorinated to DCF 1 by catalytic hydrogenation. In Zn/Co(II) system, DCF was mainly dechlorinated to DCF 1 and DCF 2 by catalytic hydrogenation. This technique provides an alternative method for DCF removal and expands the application field of Zn reduction technology.
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Environmental Science-Water Research & Technology
·
2022
·Vol. 8
·期 10
·2231-2244
·
IF 5.819
Jun Zhao,Jingquan Wang,Erdeng Du,Yijie Ai,Jingjing Liu,Hongguang Guo
The increasing need for water decontamination under high salinity conditions calls for alternative processes with high efficiency and cost-effective performance, of which electrochemical technologies hold continuous attraction. Compared to several studies under chloride background, contaminant degradation in high sulfate concentrations using electrochemical methods has rarely been studied. In this study, a facile and cost-effective TiO2 nanotube (NT) electrode, coated with a PbO2 layer was fabricated to serve as an anode to degrade the selected contaminant under the condition of high sulfate concentration. 100% removal of 0.05 mM 2,4-dichlorophenol (2,4-DCP) was achieved within 50 minutes at a relatively low current density. Degradation of 2,4-DCP followed pseudo-first-order kinetics in the electrochemical system, and the parameter of current density was proved to have the biggest effect on the pollutant removal performance compared to pH and salt concentrations. The mechanism of 2,4-DCP degradation followed the radical and direct electron transfer (DET) pathways. Even though the sulfate radical was generated in water containing high sulfate, the theoretical energy barrier calculated from density functional theory (DFT) simulation indicates the priority of hydroxyl radical on pollutant degradation, and the comparison of reaction energy based on experiments and DFT also suggested that the sulfate radical is more prone to act as a precursor for more hydroxyl radical formation. The degradation performance under various salt conditions was also investigated in this study. High content of chloride in water resulted in extremely fast removal performance, while high content of nitrate in water resulted in the apparent inhibition of pollutant removal. The as-made electrodes exhibited excellent performance for the degradation of different contaminants and reliable stability after rounds of use. This study provides an insight into the application of an electrochemical oxidation system in high salinity wastewater treatment.
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