COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
·
IF 5.518
Xiao-han Pan,Jian-hua Zu,Jing-jie Diao,Yi Xue,Si-yu Liu
The aim of current work was to explore a new material for the fast, efficient and selective recovery of precious metal silver (Ag(I)) from electroplating effluents to alleviate its high consumption and mitigate its environmental pollution. In this study, the sulfydryl-rich covalent organic framework (COF-SH) was prepared by solvothermal method . Its Ag(I) adsorption performance was evaluated by batch adsorption experiments that the effects of initial Ag(I) concentration, ratio of adsorption dosage to solution volume, adsorption time and reacting temperature were studied. The isothermal data fitted well with the Langmuir model and the maximum adsorption capacity at 298 K was up to 609.89 mg/g. The adsorption rate was very fast almost achieving adsorption equilibrium within 16 min. The adsorption rate and adsorption capacity increased with the increase in reaction temperature. The perfect fitting with pseudo-second-order kinetic model indicated the adsorption process was dominated by chemisorption process. Weber–Morris intraparticle diffusion model divided the adsorption process into three stages and temperature had a positive correlation with the first stage, external surface diffusion . The thermodynamic fitting results suggested that the adsorption process was endothermic, disordered and spontaneous. In terms of application, COF-SH achieved highly selective adsorption of Ag(I) in simulated electroplating wastewater with coexistence of multiple metal ions , especially at high acidity (≥1 M HNO 3 ), and the increase in concentration of competing ions had no affects. In addition, 1 M HNO 3 + 0.3 M thiourea (TU) could be used as desorption agent with 100% Ag(I) desorbed from the adsorbed adsorbent COF-SH-Ag.
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SOLVENT EXTRACTION AND ION EXCHANGE
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2022
·
IF 3.695
Huifang Xing,Liangrong Yang,Lu Wang,Mengfang Li,Jiemiao Yu,Diannan Lu,Gang Ye,Huizhou Liu
The effect of ion species and concentration on the extraction percent of Cs+ by 1,3-Diisopropoxycalix [4] arenecrown-6 (BPC6) in octanol/water solvent extraction system has been studied by molecular dynamics simulations and experiments. The results show that the anionic species play an important role on the enhancement of the extraction percent of Cs+. Specifically, the order in which anions promote the extraction percent is different at different total anion concentrations. At a relatively low anion concentration of 0.5 M, the extraction percent follows the sequence: ClO4−> I−> NO3−> Br−> Cl−> SO42−> F−. At a relatively high concentration of 2 M, the extraction percent of Cs+ follows the following sequence: I−> ClO4−> Br−~ NO3−> Cl−> SO42−> F−. It is indicated that the extraction percent is dominated by the anion’s interface propensity, which is the probability of anion distribution in the interface compared to the water phase. However, at low concentration of anions, strong coordination effect of NO3− promotes the extraction effect compared to Br−. At the high anion’s concentration, the stronger salting-out capacity of Br− leads to a considerable increase of extraction percent. In addition, the cations also slightly affect the extraction percent. The extraction percent is affected by both cations’ concentration and the salt-out effect. On this basis, a neutral Cs+ extraction system has been established, and one stage extraction percent could reach 62.5%.
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ACS Applied Nano Materials
·
2022
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IF 6.14
Yingsha Wang,Shanshan Cheng,Meili Liu,Jia Liu,Shouting Zhang,Wenping Hu
Developing a peroxidase-like activity modulator to accurately regulate peroxidase-like activity has always been the primary challenge to be addressed. External stimulation can effectively modulate the electronic structure of metal-centered active sites, which optimizes the chemical reaction path and changes the peroxidase-like activity. Herein, in a weak acidic environment (pH = 6.0), we found that the electron transfer may occur between silver nanoparticles (Ag NPs) anchored on the surface of reduced graphene oxide/poly(ethylene glycol) (rGO/PEG) nanosheets and added mercury(II) (Hg2+), which can induce the formation of mercurous ions (Hg(I), Hg22+). Hg(I) with regulatory catalytic performance can stimulate the expression of the active sites of Ag NPs via optimizing the electronic structure so that the adsorbed H2O2 molecules can efficiently produce reactive oxygen intermediates (•OH and •O2–) and be stabilized on the surface of Ag NPs. Meanwhile, density functional theory (DFT) calculations showed that the generated Hg(I) significantly reduced the Gibbs free energy of the chemical reaction and provided a pathway for electron transfer, which effectively enhanced the peroxidase-like activity. Based on this finding, a visual colorimetric sensor was constructed to detect Hg2+ with a detection limit of 19.7 nM in the range of 0.02–5.0 μM. Finally, we confirmed that the developed rGO/PEG/Ag nanohybrids can quantitatively detect Hg2+ in the environment. This method is reliable and has potential advantages in the environmental application field.
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CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Hao Xiong,Hanyou Zhang,Baisheng Sa,Ping Li,Lingyan Lin,Aijun Yang,Jiansheng Li,Jinquan Hong,Linqin Jiang,Yu Qiu
All-inorganic halide perovskite nanocrystals (PNCs) have attracted extensive attention due to their potential for the next-generation displays. The ammonium and halide composition affect strongly the photoelectrical properties and the long-term stability of PNCs. In this work, we present a novel class of mixed all-inorganic (Cs,NH 4 )Pb(Br,X) 3 (X = Cl, Br, I) NCs prepared via cation/anion co-exchange reaction between CsPbBr 3 NCs and the mechanochemically reacted NH 4 Pb n X 2n+1 (X = Cl, Br, I, n = 1 or 2) powders. The cubic morphologies of (Cs,NH 4 )Pb(Br,X) 3 NCs with different halogen element combinations were successfully obtained. In the meanwhile, the extended emission ranges from deep-blue (453 nm) to warm-yellow (564 nm). Higher PLQY and higher stability against ambient air and UV light were achieved simultaneously by controlling the ion co-exchanging process. The photoluminescence quantum yield (PLQY) of (Cs,NH 4 )Pb(Br,X) 3 (X = Cl, Br, I) NCs were also significantly enhanced compared with that of pure CsPbBr 3 after ions exchanging (>85% versus 58%). In addition, the stability of (Cs,NH 4 )Pb(Br,X) 3 (X = Cl, Br, I) NC thin films under the UV-irradiation and in the ambient atmosphere were also dramatically improved. The cation/anion co-exchanging synthetic strategy developed in our research provides a new pathway to modulate and realize mixed-ion PNCs with high optoelectronic performance.
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Advanced Materials Interfaces
·
2021
·Vol. 8
·期 24
·2101543
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IF 6.147
Wei Zhang,Tao Liu,Yuansheng Shan,Bailing Hou,Zhenyu Chu,Xiaoping Gu,Zhengliang Ma,Wanqin Jin
Due to the short course and high mortality of acute myocardial infarction (AMI) which will cause irreversible myocardial necrosis to induce cardiac arrest, its early diagnosis within minutes is always a challenge in clinical emergency. In this work, an ultrafast and ultrasensitive aptasensor is designed to achieve quantitatively detection of cardiac troponin I (cTnI) which is proved as a highly specific and sensitive biomarker to AMI, and within only 4 min, the cTnI concentration can be accurately reported. This aptasensor is constructed via an in situ growth of the oriented Pt-polyaniline (PANI) needle-like nanoarrays providing both high electrocatalysis and abundant active sites as the signal magnifier and DNA carrier. A target-induced strand release strategy is proposed to remarkably accelerate the recognition process of cTnI through the specific design of DNA stand for binding. The as-prepared aptasensor can exhibit an ultrawide linear detection range of cTnI from 1 pg mL −1 to 100 ng mL −1 satisfying the clinical demand for AMI diagnosis, together with excellent selectivity among various biomarkers. Based on its fast recognition ability, this aptasensor presents a high accuracy in the practical detection of human serum to prove its promising ability in the early and on-site diagnosis of AMI.
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Frontiers in Microbiology
·
2021
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IF 5.64
Chen Guo,Shuhan You,Changmei Li,Tiantian Chen,Xiudan Wang
The global food waste problem, especially aquatic product spoilage, stimulates the accurate freshness analysis of food products. However, it still remains a great challenge to realize in-field determination of fish freshness at the time of use. In the present study, a colorimetric enzyme biosensor was developed for one-step detection of hypoxanthine (Hx), which is an important intermediate of adenosine triphosphate decomposition during fish storage. We demonstrate that xanthine oxidase grade I ammonium sulfate suspension (XOD-ASS) possesses peroxidase activity. It can oxidize different peroxidase substrates, including 3,3′,5,5′-tetramethylbenzidine, 2,2′-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid) diammonium salt, and o-phenylenediamine in the presence of H 2 O 2 , producing visible color reactions. Further experiments indicate that XOD-ASS displayed effective peroxidase activity and could be used for H 2 O 2 detection. Based on this, a one-step Hx detection method was established using only XOD-ASS as the catalyst. The method displays a good linear relationship in the range from 20 to 100 μM with a detection limit of 6.93 μM. Additionally, we successfully applied this method in testing Hx accumulation in sea bass fish samples of different storage times. The recovery values range from 97.44 to 102.56%. It is exciting to note that, compared with other methods, our proposed method provides a robust advantage on the economic reaction system, ease of preparation, short time consumption, and moderate reaction temperature. We believe that this method shows good application prospects for on-site fish freshness determination.
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PubMed
高影响因子
DALTON TRANSACTIONS
·
2016
·Vol. 45
·期 15
·6371-6382
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IF 4.177
Fu Yang,Shijian Zhou,Haiqing Wang,Saifu Long,Xianfeng Liu,Yan Kong
Nanospherical hexagonal mesoporous silica (HMS) with a functional mesochannel covered with thin-layer-dispersed cobalt oxide species was directly fabricated via a novel metal-assisted templating method (S0M+I−). In this special method, cobalt ions would be enriched on the surface of the pore wall by physicochemical interactions among the surfactant, cobalt ions and silica. Typically, a metallomicelle template (S0M+) formed from the coordinative assembly of metal cations (Co2+, M+) with neutral surfactant dodecyl amine (DDA, S0) would match with negatively charged silicate oligomers (I−) by counter-ion interactions to assemble into the Co-modified HMS nanosphere. The metallization of DDA micelles and the role of cobalt ions in the assembly process can be demonstrated. Interestingly, the addition of amounts of cobalt apparently affects the size of the HMS nanosphere. Additionally, the coverage of CoO species on the mesochannel is increased with cobalt ions coordinated on the micelles. Finally, the functional Co-HMS with dispersed catalytic active phase and improved structure exhibits a special catalytic activity (yield of ca. 65%) for direct oxidation of phenol to p-benzoquinone with the assistance of a sulfate radical stimulated from cobalt in the presence of peroxymonosulfate.
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JOURNAL OF INORGANIC BIOCHEMISTRY
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2021
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IF 4.155
Rui-Xue Liu,Ru-Yi Luo,Meng-Ting Tang,Yan-Cheng Liu,Zhen-Feng Chen,Hong Liang
Based on the anticancer pharmacophore of anthrahydrazone and quinoline, a new quinolylanthrahydrazone ligand, 9-AQH (anthracene-9-quinolylhydrazone), was synthesized to further afford four metal complexes, [Co II (9-AQH)(NO 3 ) 2 (H 2 O)] ( 1 ), [Ni II (9-AQH) 2 (H 2 O) 2 ]·2NO 3 ( 2 ), [Cu I (9-AQH) 2 ]·NO 3 ( 3 ), [Zn II (9-AQH) 2 (NO 3 )]·NO 3 ( 4 ), determined by X-ray single crystal diffraction analysis. The reaction of Cu(NO 3 ) 2 with 9-AQH formed the stable and repeatable copper(I) complex 3 . In vitro screening demonstrated only 3 showed significant and broad-spectrum anticancer activity , indicating that Cu(I) played a key role in exerting the anticancer activity. In solution, Cu(I) was not naturally oxidized to Cu(II) suggested by 1 H-NMR (Nuclear Magnetic Resonance) and EPR (Electron Paramagnetic Resonance) analysis. The presence of 3 could also catalyze the H 2 O 2 system to give hydroxyl free radicals , suggested by further EPR and electrophoresis assay. At the cellular level, although no obvious Cu(II) signals were detected and the total ROS (Reactive Oxygen Species) scavenging in the tumor cells treated with 3 , the potential redox property between Cu(I)/Cu(II), as a key role, should not be denied for the significant anticancer activity of 3 , considering the much complicated circumstance and other reductive substances in cells. The anticancer mechanism of 3 on the most sensitive MGC-803 cells pointed to significant cell apoptosis through mitochondrial pathway, rather than cell cycle arrest . While the autophagy observed in tumor cells treated by 3 suggested its complicated anticancer mechanism, and whether there was an intrinsic correlation still needed to be further investigated.
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ANALYTICAL CHEMISTRY
·
2020
·
IF 6.785
Bo Wang,Shuai Zheng,Yan Huang,Ying Wang,Zhenyu Zhu,Ran Ma,Yu Zhao,Xijie Yin,Jing Su,Juan Xiong,Benli Zhang,Youping Zhou
The 18O/16O (and 15N/14N) ratio of natural nitrate (NO3–) and nitrite (NO2–) can be used to extract valuable information about their source and fate as environmental contaminants, their metabolism as macronutrients in plants and animals, and their behavior in the N biogeochemical cycle. We developed an accurate, precise, sensitive (minimum sample size: 0.2 μg NO3–-equivalent), and reliable (minimal oxygen exchange, loss, or gain) method to selectively isolate and purify nitrate and nitrite from natural water, soil, air, and plant materials by strong anion exchange (SAX) for low- to normal-salinity samples or strong cation exchange (SCX) for high-salinity samples, followed by quantitative conversion to their respective benzyl esters, which can be separated and individually analyzed for δ18O (and potentially δ15N) by gas chromatography (GC)/pyrolysis/GC/isotope-ratio mass spectrometry (IRMS). The method compares favorably with the currently popular bacterial denitrification and chemical reduction methods, in terms of sensitivity and reliability, and has the potential to simultaneously measure δ15N and δ18O of nitrate and nitrite from natural samples of various origins.
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JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2020
·
IF 2.369
Yanbo Liu,Mingyang Chen,Jiawei Lin,Maolin Li,Kang Li,Zhenguo Gao
Experimental solubility data of clopidogrel hydrogen sulfate (form I) in four binary solvents (1-propanol + isopropyl acetate, 2-propanol + isopropyl acetate, 1-butanol + isopropyl acetate, and 2-butanol + isopropyl acetate) was measured by using the laser dynamic method at the temperature ranging from 278.15 to 318.15 K. The experimental results showed that the solubility of clopidogrel hydrogen sulfate (form I) increased with the increasing temperature of all four binary solvent systems at the constant solvent composition, and the isopropyl acetate had a negative effect on the solubilities. The solubilities of clopidogrel hydrogen sulfate (form I) were correlated by the modified Apelblat, λh, and NRTL equations. The results indicated that the three models can predict the experimental values satisfactorily. Moreover, the modified Apelblat equation achieves the best fitting performance compared with other two models through calculating the value of average relative deviation.
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LANGMUIR
·
2020
·
IF 3.557
Renxuan Liu,Ying Hou,Shangjun Jiang,Bei Nie
We report a facile approach to fabricate an Ag-embedded fullerene (C60) catalyst by the chemical reduction of the AgNO3 complex encapsulated fullerene microcrystal, which showed an enhanced catalytic reduction of 4-nitrophenol because of the strong absorption and propagation of H2 along the fullerene surface. With the aid of visible-light radiation, photodegradation of orange G dye is achieved through the formation of an electron donor–acceptor dyad between plasmon Ag nanostructures and fullerene molecules, which effectively offsets the “electron–hole” recombination. Neither Ag nanoparticle nor fullerene crystal used in isolation could perform this chemical conversion, implying that the metal–fullerene hybrid structure is imperative for performing the catalytic reaction. The obtained Ag-embedded fullerene crystal is characterized by scanning electron microscopy (SEM), associated energy-dispersive X-ray spectroscopy (EDX) imaging, and X-ray photoelectron spectroscopy (XPS) and demonstrates that the present hybrid materials would add a supplemental member to a family of photocatalysts toward the organic synthesis and wastewater remediation.
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ANALYTICAL LETTERS
·
2020
·
IF 1.467
Fang Hou,Xiao-Long Fu,Xue-Bo Hu,Jun-Tao Cao,Shu-Hui Ma,Yan-Ming Liu
A label free electrochemiluminescence (ECL) immunosensor for the determination of cardiac troponin I was developed using CdS-MoS2 composites as the electrochemiluminescence emitters. The CdS-MoS2 composites were synthesized by a hydrothermal method and used for the construction of the electrochemiluminescence biosensing platform. For the fabrication of the immunosensor, CdS-MoS2 composites, chitosan, cardiac troponin I antibodies, and bovine serum albumin were consecutively assembled on the glass carbon electrode. Under the optimum conditions, the label free electrochemiluminescence determination of cardiac troponin I was obtained. Due to the excellent electrochemiluminescence performance of CdS-MoS2 composites and high specificity of the immunoreactions, the sensor shows satisfactory selectivity and high sensitivity for cardiac troponin I determination. The detection limit was 1.0 pg mL−1 and the linear range was from 5.0 pg mL−1 to 100.0 ng mL−1. Moreover, the method was successfully used to determine cardiac troponin I in human serum samples with recoveries between 85.4 and 111.0%. This label-free immunosensor possesses many merits, including a simple sensing process, good electrochemiluminescence performance of the CdS-MoS2 composites, and high flexibility for extending the strategy for the determination of other biomarkers.
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