NEW JOURNAL OF CHEMISTRY
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2020
·Vol. 44
·期 41
·17671-17678
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IF 3.288
Saira Shams,Waqas Ahmad,Amjad Hussain Memon,Sumaira Shams,Yun Wei,Qipeng Yuan,Hao Liang
The objective of this study was to design a more effective antibacterial agent to overcome the problem of fast-growing bacterial resistance. The results showed that a Cu/H3BTC metal–organic framework (MOF) exhibited a notable antibacterial performance towards Staphylococcus aureus (S. aureus) and Escherichia coli (E. coli), and could significantly disrupt the cell membrane, resulting in the discharge of cell constituents. In addition, morphological changes were elucidated using scanning electron microscopy (SEM). SEM photographs demonstrated noticeable and apparent changes in the morphology of bacterial cells, signifying cell damage that was further confirmed via confocal laser scanning microscopy (CLSM). Furthermore, the result of agarose gel electrophoresis (AGE) showed that Cu/H3BTC MOF could enter the bacterial cells by impairing cell membranes and inhibiting the synthesis of DNA. These findings indicated that the Cu/H3BTC MOF is a potent antimicrobial material that can be applied to hinder the growth of pathogenic microbes.
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DALTON TRANSACTIONS
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2020
·Vol. 49
·期 41
·14475-14482
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IF 4.174
Jing Yang,Xianliang Li,Junbiao Wu,Yide Han,Zhuopeng Wang,Xia Zhang,Yan Xu
Multicomponent spinel ferrites are essential to be used in high-performance gas-sensing materials. Herein, multinary (Cu,Zn)Fe2O4 spinel nano-microspheres with tunable internal structures, including solid, core–shell, and yolk–shell, were successfully synthesized by a simple self-templated solvothermal method combined with a subsequent annealing strategy. The internal structures of the (Cu,Zn)Fe2O4 nano-microspheres significantly rely on the heating rates of the precursors, which show promising selective response towards trimethylamine gas. Among them, the as-formed yolk–shell (Cu,Zn)Fe2O4 nano-microspheres exhibited high response to triethylamine with excellent selectivity of STEA/SX = 1.86 at 160 °C, fast response–recovery rate (58 s/136 s), and long-term repeatability and stability of more than one month. The corresponding triethylamine gas-sensing mechanism with the special microstructures is discussed. This work provides new insights into the rational design of interior structure and the modulation of high gas response and selectivity of multinary spinel ferrites in gas-sensing applications.
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METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE
·
2020
·Vol. 52
·期 1
·314-321
·
IF 2.035
Ren Guoxing,Xiao Songwen,Xia Longgong,Liao Caibin,Liu Zhihong
To obtain fundamental information on the dissolution of cobalt into alumina-saturated MnO-SiO 2 -Al 2 O 3 slags in the smelting reduction of spent lithium-ion batteries, the equilibrium distribution of cobalt between Co-Cu alloys and alumina-saturated MnO-SiO 2 -Al 2 O 3 slags was measured at 1573 K and 1623 K under a controlled CO-CO 2 atmosphere. The results show that (i) the solubility of cobalt in the slag increased with increasing concentration of cobalt in the alloy and increasing oxygen partial pressure in the atmosphere at a fixed concentration of cobalt in the alloy, and (ii) the activity coefficient of CoO in the slag increased with increasing cobalt oxide in the slag. The activity coefficient of CoO in the slag, γ CoO, referred to as solid CoO, can be described as a function of the concentration of CoO in slag as follows: γ CoO = 11.2957(wt pct CoO in slag) + 12.0944 (1573 K, (wt pct MnO)/(wt pct SiO 2 )= 0.76–0.83); γ CoO = 2.2286(wt pct CoO in slag) + 4.5232 (1623 K, (wt pct MnO)/(wt pct SiO 2 )= 0.78–0.85).
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CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Ying Liu,Hongye Bai,Qianxiao Zhang,Yajie Bai,Xuliang Pang,Fagen Wang,Yingchen Yang,Jinrui Ding,Weiqiang Fan,Weidong Shi
Photoelectrochemical N 2 reduction reaction (PEC NRR) into chemical energy source is a promising technique for solving environmental challenges and the energy crisis, which depends on the exploration of p-type photocathodes. Cu 2 O is a p-type semiconductor, which can be applied as a photocathode for PEC NRR. However, the adsorption and activation ability of N 2 over the pristine Cu 2 O is still not ideal, causing the overall efficiency far below the theoretical value. In this work, we first proposed a feasible strategy to in-situ modify the surface of Cu 2 O with Cu-MOF, and the Cu-MOF/Cu 2 O heterostructure exhibited the significantly boosted NH 3 production rate (7.16 mmol/m 2 /h). The ultra-thin Cu-MOF film takes a nature of porous structure and unsaturated Cu sites, contributing to a favorable interface environment for the adsorption and activation of N 2 . The N 2 temperature programmed desorption and contrast photocurrent curves revealed the desirable selectivity for PEC NRR, and the isotope NMR further confirmed the accuracy of NH 3 evolution process. Therefore, the organic–inorganic hybrid systems built from Cu-MOF and Cu 2 O would offer a new insight for establishing the efficient PEC NRR system.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2020
·
IF 3.99
Hongchao Ma,Nannan Zheng,Yitong Chen,Lei Jiang
As a green catalyst containing four copper sites in its structure, laccases have attracted considerable research attention and widely applied in pollutant removal, food industry and biosensors. Recently, a series of Cu-based organic-inorganic nanocomposites have been designed as laccase mimics. In this report, we investigated the laccase-like catalytic activity of Cu-tannic acid organic-inorganic nanohybrids (CTNs). Using 2,4-dichlorophenol (2,4-DP) and 4-aminoantipyrine (4-AP) as the substrate, we found CTNs synthesized at low temperature which possessed thin nanostructure and large Cu + /Cu 2+ ratio had higher catalytic activity than those obtained at high temperature. Like natural enzymes as well as other nanozymes, CTNs exhibit pH-dependent catalytic activity and display the optimal catalytic activity in physiological condition. Interestingly, CTNs show high tolerance to temperature and could maintain high catalytic activity even when the temperature was increased to 85 °C. Compared to natural enzymes, CTNs have high stability and excellent recyclability, making them promising candidates in some bio-applications. Moreover, CTNs could catalyze the oxidation of epinephrine to a brown product. Based on this, a simple colorimetric assay for the detection of epinephrine could be constructed.
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Environmental Technology & Innovation
·
2020
·
IF 3.356
Yiliang Chen,Hao Shi,He Guo,Chen Ling,Xinyu Yuan,Pingping Li
This study combined agricultural waste utilization with wastewater treatment and developed a novel nanocomposite adsorbent for Cu 2 + removal from water. Rice straw (RS) was used as the supporter of hydrated titanium oxide (HTO), which has strong affinity toward heavy metals. HTO nanoparticles were uniformly loaded onto the surface of natural rice straw through a facile sol–gel method. The characterization results show that the diameter of the RS-HTO nanoparticles was about 80 nm with SEM. The fabricated nanocomposite RS-HTO exhibited excellent structural stability under different solution pH and ionic strength. Adsorption of Cu 2 + increased as pH rose from 2.0 to 7.5 with 2 g/L RS-HTO in 50 mL solution (10 mg/L). Meanwhile, when initial concentration of Cu 2 + was 10 mg/L, the adsorptive removal efficiency was higher than 99% by RS-HTO at a pH level of 7.5. The adsorption selectivity was investigated and proved that the coexisting cation ions such as Na + , Mg 2 + and Ca 2＋ led to a small decrease of Cu 2 + adsorption capacity. Adsorption isotherms of Cu 2 + onto RS-HTO fitted well with Langmuir equation, and the adsorption kinetics were best described by pseudo-second order model. The concentration of Cu 2 + in the simulated wastewater can be reduced to be lower than 0.2 mg/L through fixed-bed adsorption process and the exhausted RS-HTO can be easily regenerated with HCl–NaCl mixed solution.
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Peptide Science
·
2020
·Vol. 113
·期 2
·e24208
·
IF 1.865
Jiqian Wang,Chengdong Wang,Yanqing Ge,Yawei Sun,Dong Wang,Hai Xu
The alteration of amino acid register in peptides could affect their folding properties and thus functions. The effect of sequence in metal ion induced folding of peptide/protein is important in the design of new functional protein structures, such as biomimetics. In this paper, a set of hairpin peptides with identical composition but different histidine locations have been designed to exploit the metal ion-mediated peptide intramolecular folding transformation through the adjustment of histidine and lysine residue locations. The results demonstrated that the histidine positions in peptide sequence could dramatically affect the coordination modes between peptides and Cu(II) ion. The Cu(II) coordination could affect the secondary structure transformation and self-assembly along with electrostatic interaction and hydrogen bonding synergistically. Three molecules with VHVH sequence at each side of the turn segment (V D PPT) were apt to coordinate with Cu(II) ion with three or four histidines. The closer the VHVH motifs were to the turn segment, the more easier the molecules were to form β sheet structure with the promotion of Cu(II) ions. These results demonstrated that the purposeful location of key amino acids in peptides could achieve the controllable conformation transformation of hairpin peptides, which provides useful strategies for biomimetic design, such as metalloenzymes. Graphical
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BIOSENSORS & BIOELECTRONICS
·
2020
·
IF 10.257
Bingfang Wang,Yuanyuan Luo,Lei Gao,Bo Liu,Guotao Duan
Accurate detection of glucose is essential for the diagnosis of diabetes, wherein effective and sensitive biosensors for glucose detection are needed. Here, we fabricated a glucose sensor based on field-effect transistor (FET) with bimetallic nickel-copper metal-organic frameworks (Ni/Cu-MOFs) as its channel layers which were grown in-situ through a simple one-step hydrothermal method and modified with glucose oxidase (GOD) by using glutaraldehyde (GA) as linkers. Due to the synergistic effect of Ni ions and Cu ions in MOFs, the sensor (GOD-GA-Ni/Cu-MOFs-FET) showed good field effect performance and great responses to glucose through enzymatic reactions . It displayed a piecewise linear relationship in the wide range (1 μM–20 mM), and provided high sensitivity (26.05 μAcm −2 mM −1 ) in the low concentration (1–100 μM) and a low detection limit (0.51 μM). The sensor also had these advantages of high specificity, excellent reproducibility, good short-term stability and fast response time. Especially, it is indicated that the Ni/Cu-MOFs-FETs with high performance have the potential to be available sensors, paving the way for the application of bimetallic MOFs in biosensing.
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INTERNATIONAL JOURNAL OF ENERGY RESEARCH
·
2020
·Vol. 45
·期 4
·6273-6284
·
IF 3.741
Xiaolin Shao,Qi Zhang,Xurui Zhang,Jin Yi,Yuyu Liu,Jiujun Zhang
Summary A facile method is developed to fabricate nanoporous, structured, Sn-based catalyst electrodes. Sn, Zn, and multiwalled carbon nanotubes (MWCNTs) are co-electrodeposited on a copper substrate, followed by chemical dezincification in NaOH aqueous solution to remove Zn. By controlling variables such as the contents of Zn and MWCNTs, a series of Sn-MWCNT/Cu (S Z MC) electrodes are fabricated. Experimental results show that using such novel S Z MC electrodes can achieve a HCOO − Faradaic efficiency of over 91% at −0.99 V versus RHE for 10 hours in CO 2 -saturated 0.5 M KHCO 3 aqueous solution. The high performance is attributed to the addition of MWCNTs and Zn, followed by chemical dezincification to remove Zn and then create vacancies in the catalyst structure, which results in a special porous structure of S Z MC with large surface area. Then ECSA is used for enhancing the catalytic activity and selectivity of HCOO − production, as well as promoting intermediate adsorption and mass transfer.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2020
·
IF 16.683
Lixia Li,Juanhua Kong,Huimin Zhang,Sijie Liu,Qiang Zeng,Yaqin Zhang,Hao Ma,Hongyan He,Jinxing Long,Xuehui Li
The catalytic depolymerization process for lignin to produce value added chemicals is often challenged by the limited mass transfer over heterogeneous catalysts, the complex aromatic biopolymer structures, and the high recalcitrance of C C bonds. Herein, a series of hierarchical MFI nanosheets (MFI-ns) supported metal oxide catalysts have been designed and used for the selectively oxidative cleavage of organosolv lignin. As expected, 81.6 % conversion of lignin can be achieved over 15Ce-5Cu/MFI-ns with 294.0 mg g −1 yield of volatile products, including 180.9 mg g −1 of diethyl maleate. Quantum chemistry calculation coupled with static adsorption measurements shows that the superior catalytic activities of these catalysts are ascribed to the favorable mass transport of lignin to the active sites by the unique layer structure, and the hierarchical pore sizes distribution, as well as the electronic effect between Cu and Ce components. In addition, the catalytic mechanism for the cleavage of C C bonds in β -O-4 model probes has been studied via the controlled oxidative degree of model compounds and the isotope-labeling experiments. Therefore, this work provides a new insight into the efficient utilization of lignin via the rational design of catalysts.
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JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2020
·Vol. 167
·期 8
·087502
·
IF 3.721
Ya Li,Lina Hou,Zhiling Liu,Wenbo Lu,Man Zhao,He Xiao,Tianjun Hu,Zhanfeng Zheng,Jianfeng Jia,Haishun Wu
Mucin 1 protein (MUC1) is a well-known tumor marker overexpressed in a variety of human malignancies, and thus its highly selective and sensitive detection is significantly desired for clinical diagnostics. Herein, a sensitive electrochemical MUC1 sensing platform has been fabricated based on copper-based metal-organic frameworks (Cu-MOFs) decorated with gold-platinum alloy nanoparticles (AuPt NPs). Besides serving as a redox probe to avoid introducing extra redox media, the electroactive Cu-MOFs function as catalysts in the hydrogen peroxide reduction, resulting in electrochemical signal amplification. Meanwhile, AuPt NPs loaded on the Cu-MOFs mimic horseradish peroxidase to promote the reduction of hydrogen peroxide, giving rise to the secondary-amplified electrochemical signal. Moreover, the target MUC1 triggered catalytic hairpin assembly (CHA) further improves the sensitivity of the developed biosensor via the target recycling amplification. The constructed sensing platform displayed a desirable dynamic range between 10 fM and 10 nM in the MUC1 detection, with a sufficiently low limit-of-detection (3.33 fM). The current strategy of utilizing hybrid nanocomposite consisting of MOFs and alloy NPs and enzyme-free CHA provides a promising platform for the detection of biomarkers in the clinical diagnosis with high selectivity and sensitivity.
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JOURNAL OF CONTROLLED RELEASE
·
2020
·
IF 7.727
Tao Sun,Guangping Zhang,Zhongyuan Guo,Qinjun Chen,Yujie Zhang,Yongchao Chu,Qin Guo,Chao Li,Wenxi Zhou,Yiwen Zhang,Peixin Liu,Hongyi Chen,Haijun Yu,Liping Jiang,Chen Jiang
Chelating Cu from tumors has been verified as an effective and promising strategy for cancer therapy through antiangiogenesis. However, systematic removal Cu by injecting with Cu chelators will result unavoidable side effects, since Cu is indispensable to the body. In this work, a micelle targeting to tumors' newborn vessels based on a polypeptide was developed to co-load DOX and Probe X, which can go through an “OFF-to-ON” procedure to report the Cu + -capture events in vivo in a real-time way by giving near infrared (NIR) fluorescence and photoacoustic signal. By co-delivering antiangiogenesis and chemotherapeutic reagents, the tumor can be significantly suppressed, meanwhile with a low systematic toxicity. Hopefully, this work can offer new insights in designing sophisticated antitumor strategy.
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