CARBOHYDRATE POLYMERS
·
2026
·
IF 13.2
Wanting Li,Yangkun Cao,Kunpeng Gao,Lili Yin,Kang Lian,Hong Jiang,Yang Hu,Xiangzhao Mao
Chitosanases are attractive biocatalysts for producing bioactive chito-oligosaccharides (COS), but their applications are limited by insufficient catalytic efficiency, poor stability, and challenging recovery. Although many chitosanases can be activated by metal ions, the direct addition of free ions into reaction systems suffers from low efficiency and separation challenges. This study presented a MOF-based strategy to create a Cu-enriched coordination microenvironment, enabling simultaneous immobilization and activation of marine polysaccharide hydrolases. Taking chitosanase OUC-CsnCA as a model, the immobilization on Cu-trimesic acid (Cu-BTC) doubled its activity (413.5 ± 34.7 U/mg) and increased k cat from 361.8 ± 8.0 to 704.4 ± 16.1 min −1 , along with improved thermostability and pH tolerance. MALDI-TOF-MS and HPLC confirmed deeper substrate depolymerization upon immobilization. Kinetic and spectroscopic analyses revealed that Cu 2+ -binding modulated enzyme conformation and promoted enzyme–substrate interactions. Molecular dynamics simulations further indicated that Cu 2+ coordination was associated with adjustments in catalytic cleft geometry (D102–E84) and reinforcement of hydrogen-bond interactions within the substrate-binding pocket. Enhanced activities were further observed for immobilized ι-carrageenase and α-agarase, demonstrating the potential applicability of this strategy to other metal-responsive marine polysaccharide hydrolases.
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JOURNAL OF MATERIALS SCIENCE
·
2026
·
IF 4.4
Zhang Wanying,Dou Feng,Wang Shuhong,Wang Cheng
Multi-level storage is an effective way to increase storage density compared to binary storage. In this study, a D–A copolymer containing two different electron-withdrawing receptors was designed and synthesized, and the polymer was applied to resistive random access memory (RRAM), which exhibited flash-type ternary memory behaviour. In addition, Cu nanoparticles (NPs) were embedded in the polymer to improve the prepared storage performance. In addition, Cu NPs were embedded in the polymer to improve the prepared storage performance. The memory devices based on PCz–BB:Cu nanocomposites also exhibit flash memory performance with a threshold voltage drop from − 1.05/ − 1.95 to − 0.45V/ − 0.90V, an ON2/ON1/OFF current ratio increase from 1905:15:1 to a boost of 8950:50:1, and the three resistive states of the devices being stable for more than 3h and 10 4 cycles. The mechanism of resistive switching is explained in terms of charge trapping and conducting filament theory. This work contributes to the rational design and fabrication of high-density storage materials.
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MICROCHIMICA ACTA
·
2025
·Vol. 192
·期 7
·1-12
·
IF 5.3
Hu Fuqiang,Cai Taimei,Zhu Wenting,Peng Hailong
A porous double variable-valence FeCe nanozyme (pFeCezyme) was designed using hemoglobin as template and Fe-source. pFeCezyme exhibited excellent peroxidase (POD)-like activity due to the porous structure, maximized exposure of active sites, synergy of double variable-valence metals, and enhanced electron transfer between Fe and Ce. The POD-like activity can be quenched (off) by l -cysteine ( l -Cys) and then restored (on) by adding of heavy metal ions (HMIs). The degree effect of “on–off” POD-like activity can be varied by changing pH conditions. Therefore, a three-channels pFeCezyme sensor array was established using pH values (pH = 4.0, 5.0, and 6.0) as sensing elements. Interestingly, pFeCezyme sensor array can generate distinct colorimetric fingerprints due to the different affinity ability between l -Cys and HMIs. The pFeCezyme sensor array was successfully applied to highly sensitive and high throughput discrimination of HMIs (Ag + , Hg 2+ , Cu 2+ , Cr 6+ , and Fe 3+ ) even at low concentration of 0.1 μM. Meanwhile, The pFeCezyme sensor array can rapidly distinguish binary and ternary mixed HMIs within 10 min, and the HMIs and interfering substances can be well discriminated. Furthermore, the pFeCezyme sensor array could effectively distinguished HMIs in real samples with an excellent identification for unknow HMIs. This research provides a novel strategy for identifying a variety of HMIs, which exhibits a broad application prospect in HMIs monitoring. Graphical
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PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Qifang Zheng,Lidong Qiao,Peilun Shen,Tianfu Zhang,Liuyang Dong,Dianwen Liu
Both scheelite and calcite were calcium-containing oxidized minerals with similar calcium active sites, which leads to a lack of selectivity in the adsorption of collectors. Moreover, their surface chemical and solution chemical properties were similar, which makes their flotation separation extremely challenging. In this study, vanillic acid (VA) was used as a depressant for the flotation separation of scheelite and calcite. However, the difference in recovery of these two minerals was small, making it difficult to achieve effective flotation separation. The synergistic effects of Fe 3+ , Cu 2+ , and Al 3+ with VA were further investigated. It was found that Fe 3+ and Al 3+ had poor depressive effects on calcite in the presence of VA, while Cu 2+ showed the best selectively depressive effect on calcite. When the molar mass ratio of Cu 2+ to VA was 5:1 and the pH was 9.5, the flotation recovery of scheelite and calcite were 88.3 and 3.18 %, respectively. Effective flotation separation of scheelite and calcite was achieved. In addition, the selective depression mechanism of Cu 2+ and VA on scheelite was revealed. In the slurry, VA existed in the form of anions L 2– and HL – . The addition of Cu 2+ significantly improved the adsorption environment of VA on the calcite surface. Cu 2+ could form metal complexes such as CuL and CuHL + with VA. These metal complexes could selectively chemically adsorb on the oxygen atom positions on the calcite surface, resulting in strong depression of calcite. This research provides a new method for the green flotation separation of scheelite and calcite, which has potential industrial application value.
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Chemosensors
·
2026
·Vol. 14
·期 3
·
IF 4.4
Yiyuan Zhang,Chen Zhou,Jiaxin Li,Evgeny Kovtunets
A novel acridine-based fluorescent sensor (Sensor ANT) for the highly selective and sensitive detection of cyanide ions (CN−) was rationally designed and synthesized via the conjugation reaction of acridine-9-amine with 3-nitrophenyl isothiocyanate. The sensing mechanism is triggered by the specific interaction between exogenous CN−and the hydrogen-bonding moieties within the sensor’s molecular framework, which induces a distinct fluorescence quenching response. Systematic titration experiments confirmed that Sensor ANT exhibits rapid response kinetics, excellent selectivity, and reliable qualitative/quantitative detection capabilities toward CN−. Complementary biocompatibility assays, including in vitro cellular imaging and in vivo zebrafish experiments, further verified the promising application potential of this sensor in practical and biological detection scenarios. The detection limit (DL) of Sensor ANT for CN−was calculated to be 2.89 × 10−7M, with a 1:1 binding stoichiometry and a binding constant of 1.95 × 104M−1. These findings demonstrate that Sensor ANT represents a robust candidate for CN−detection in environmental and biological systems.
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PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
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2023
·
IF 7.8
Peng Xu,Zhuoyu Yang,Xin Liu,Pengfei Zhu
Zero-valent copper (ZVC) coupled with oxygen gas (O 2 ) was extensively studied to degrade refractory contaminant, while the active dismutation reaction and low reactivity of Cu(I) refrained the performance at acid condition. In this study, ferrous ion (Fe(II)) was added to the ZVC/O 2 system (ZVC/Fe(II)/O 2 system) to enhance the degradation ability, the degradation rate of acid orange 7 in the ZVC/Fe(II)/O 2 system was enhanced by 34.8% compared to the ZVC/O 2 system, and the corresponding apparent rate constant was almost three times higher than that of the ZVC/O 2 system. In the reactive species identification experiments, by electron spin resonance experiments and quenching experiments of nitrobenzene , tert butyl alcohol and methanol, hydroxyl radical was proven as primary reactive oxygen species rather than high-valent metal-Cu(III). In addition, the optimum ZVC dosage, Fe(II) concentration, pH and stirring rate were derived based on optimization experiments combined with economic applicability. In the ZVC/Fe(II)/O 2 system, the mechanism was analyzed by detecting the variation of the concentration of H 2 O 2 , Cu(I) and total dissolved copper in the solution. In the degradation process , ZVC was corroded to form Cu(I) by H + , then Cu(I) reacted with O 2 to generate hydrogen peroxide, the generated hydrogen peroxide was induced by Fe(II) and Cu(I) to produce hydroxyl radical, at the same time, ZVC and Cu(I) could reduce Fe(III) to Fe(II). The coexisting substances like carbonate ion , nitrate ion, sulfate ion and phosphate ion did not affect the demineralization of acid orange 7 in the ZVC/Fe(II)/O 2 system, chloride ion remarkably accelerated the degradation rate of acid orange 7, while fulvic acid limited the acid orange 7 removal. The ZVC/Fe(II)/O 2 system also showed excellent degradability in well water, lake water and tap water . Total dissolved copper concentration was controlled within 1 mg/L by the alkali precipitation method, which was within II-level environmental quality criteria in China. These facts suggested that Fe(II)-enhanced ZVC system had great development potential in water treatment .
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高影响因子
FUEL
·
2022
·
IF 8.035
Chaohe Zheng,Mingze Su,Haibo Zhao
As the kinetic influencing factors were not considered properly in the previous studies, the obtained activation energies of copper oxidation were discrepantly ranging from 15.0 kJ/mol to 100.0 kJ/mol. The gas diffusion in the crucible and sample layer, the surface reaction and the defect diffusion of copper cations all have an impact on the conversion process of copper oxidation samples. Using the high diameter-height ratio crucible in our self-made TGA could effectively eliminate the gas diffusion in the crucible and reduce the error of the kinetic tests. Based on the previous four-step oxidation mechanism, the kinetic parameters of copper oxidation are identified using a grain-scale kinetic model, coupling with a defect transport model. The potential kinetic impact factors including the particle polydispersity, gas diffusion, defect diffusion, surface reaction and particle sintering are adequately considered in this work. First, it is found that the copper oxidation is not dominated by the defect diffusion in the solid product layer, but governed by the surface reaction in the gas–solid interface. The copper oxidation is likely to be adsorption-limited during the surface reaction in the gas–solid interface, and the intrinsic activation energy is identified as 48.0 kJ/mol. The particle-scale model is then performed to investigate the impact of physical properties of oxygen carrier particles. It can significantly accelerate the conversion rate of copper oxidation by means of decreasing the particle size and increasing the porosity. However, it is not advisable to decrease the grain size too much when preparing the oxygen carriers, for this will only increase diffusion resistance inside the particle for small grain. Finally, it can be found that in most conditions of the air reactor, Cu-based oxygen carrier with the grain size of 220–300 nm exhibits the best oxidation performance.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2023
·Vol. 34
·期 6
·1-8
·
IF 2.8
Xue Lisha,Wang Yuan,Zhu Shuangmei,Mao Qianhui,Jia Xiaopeng,Zhang Yuewen
We have synthesized the quaternary copper selenide Bi x Cu 2−3 x Se 0.95 Te 0.05 compounds by high-pressure followed with ball milling method and investigated their thermoelectric properties. The crystal structure and element doping are characterized and verified by the X-ray diffraction, high-resolution transmission electron microscope and X-ray photoelectron spectroscopy. Compared with other samples, the samples with x = 0.001 and 0.002 have larger layered grain size and smaller grain boundary. This may lead to the reduction of resistivity in a wide temperature range, thus realizing the optimization of electronic characteristics. The dislocation-induced lattice strain fluctuations may cause the abrupt thermal conductivity, which is contrary to the previous results. Eventually, a peak value of zT = 1.03 at 873 K is obtained for Bi 0.001 Cu 1.997 Se 0.95 Te 0.05 and Bi 0.002 Cu 1.994 Se 0.95 Te 0.05 .
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Petroleum Science
·
2022
·
IF 4.757
Guo-Qing Xu,Xiu-Ping Lan,Si-Si Zhao,Kai-Yi Hu,Si-Meng Qi,Li-Dong Geng,Quan Xu,Yang Zhou
The in situ mining technology is applied to the exploitation of medium- and low-maturity shale oil, which can use heaters to warm up the oil shale formations and pyrolyze the kerogen. Due to the low thermal conductivity of oil shale, electric heaters need extra equipment to improve heat transfer efficiency. In this study, a thermally conductive proppant is fabricated by coating epoxy-resin and graphite on ceramic proppants for the first time, which could support the fracturing crack and transfer heat. The thermal conduction property of epoxy-resin and graphite coated proppants (EGPs) is 245% higher than that of uncoated proppants, which can transfer more heat to the oil shale formation and accelerate the conversion of kerogen. The adhesive property of EGPs is improved by 47.9% under the load force of 1500 nN, which prolongs the time for the fracture to close. In summary, this novel proppant is expected to assist in-situ mining technology in the production of medium and low-maturity shale oil.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2022
·
IF 9.221
Kaiqi Liu,Luminita Marin,Xinjian Cheng
In this work, fluorescent β- cyclodextrin (β-CD) based probes containing naphthalimide group were synthesized to realize the specific recognition of Hg 2+ /Hg + in aqueous system. Firstly, three small fluorescent molecules (N1, N2 and N3) with -NH 2 groups were synthesized from 4-bromo-1, 8-naphthalene anhydride . Secondly, CH CCH 2 - group was introduced into β-CD by Williamson ether formation reaction. Finally, the target probes (β-CD-PI, β-CD-PY and β-CD-TP) were obtained by Amino-Yne click reaction. These probes can efficiently recognize Hg 2+ /Hg + . β-CD-PI emits bright yellow fluorescence after binding with Hg 2+ /Hg + , which is a turn-on fluorescent probe . When the Hg 2+ /Hg + concentration exceeds 26 μM, the fluorescence intensity amplifies sharply (20 folds). The hydrophobic parts of the probes aggregated together to form a micelle-like structure due to complexation with Hg 2+ /Hg + , resulting in special micelle-sensitizing properties. Meanwhile, the HOMO-LUMO energy levels of the probes were calculated by cyclic voltammetry (CV). The probe is expected to be used for the detection of Hg 2+ /Hg + in aqueous solutions without any organic solvents.
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高影响因子
Materials Today Energy
·
2022
·
IF 9.257
Yun Zhao,Hualin Ye,Huanyu Zhang,Dan Zhao,Limin Huang,Jim Yang Lee
Li–S batteries assembled without a lithium metal anode can significantly increase the battery specific energy and obviate the safety issue of excess Li metal in the battery. In this study we found that a black phosphorous (BP) modified cooper foil current collector could provide a beneficial anode solid-electrolyte-interface (SEI) to enable the charging and discharging of Li-metal free Li 2 S-based batteries at higher C rates. The BP modification is effective in several aspects: the lithiophilicity of BP reduces the energy barrier in Li metal deposition and stripping during battery charge and discharge. The reactions between BP and lithium polysulfides also form Li 7 PS 6 in the anode SEI layer. Since Li 7 PS 6 has a high ionic conductivity for Li + diffusion, the Li plating/stripping efficiency is improved. The synergy of the lithiophilicity of BP and a Li 7 PS 6 -rich anode interphase layer was demonstrated in Li-metal free Li 2 S batteries, where the capacity retention over 100 cycles is 64.8% at the 0.2 C rate. The findings here show that current collector modifications should attend to multiple functionalities in order to be effective for the Li-metal free Li 2 S batteries.
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Acta Metallurgica Sinica-English Letters
·
2023
·Vol. 36
·期 6
·1023-1037
·
IF 3.5
Fan Wenhao,Zhao Jianxun,Liu Dayong,Liang Qingcheng,Liu Wanqiang,Wang Qingshuang,Liu Heng,Chen Peng,Gao Shang,Bao Xinlong,Cheng Yong,Wang Xinwei,Guo Xin
Co 0.9 Cu 0.1 Si alloy was prepared by mechanical alloying method. Nitrogen-doped graphene (NG) and nitrogen–sulfur co-doped graphene (NSG) were prepared by hydrothermal method. 5 wt% graphene oxide, NG and NSG were doped into Co 0.9 Cu 0.1 Si alloy, respectively, by ball milling to improve the electrochemical hydrogen storage performance of the composite material. X-ray diffraction and scanning electron microscopy were used to characterize the structure and morphology of the composite material, and the LAND battery test system and three-electrode battery system were used to test the electrochemical performance of the composite material. The composite material showed better discharge capacity and better cycle stability than the pristine alloy. In addition, in order to study the optimal ratio of NSG, 3%, 5%, 7% and 10% of NSG were doped into Co 0.9 Cu 0.1 Si alloy, respectively. Co 0.9 Cu 0.1 Si alloy doped with 5% NSG had the best performance among all the samples. The best discharge capacity was 580.1 mAh/g, and its highest capacity retention rate was 64.1%. The improvement in electrochemical hydrogen storage performance can be attributed to two aspects. On the one hand, the electrocatalytic performance of graphene is improved by co-doping nitrogen and sulfur, on the other hand, graphene has excellent electrical conductivity.
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