COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
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IF 5.518
Yuanjie Xu,Shichao Yang,Meihui Ying,Xing Lin,Haibo Pan
Metal-organic frameworks (MOFs) are with extensive attention for environmental remediation due to their various modification and high density of active sites. Herein, a series of Ag/ZnO@ZIF-C with core-shell structure and graphene carbon (C) acts as a sandwich bridge were designed as a photocatalyst , accelerating the interfacial charge transfer rate between Ag and ZnO. Photocatalytic activities of Ag/ZnO@ZIF-C is remarkably improved toward rhodamine B (RhB) under UV irradiation , i.e., the degradation rate by Ag/ZnO@ZIF-C (20 wt%) is 2.27 times than that of P25. RhB molecules were simultaneously photodegraded at multiple sites, including N-site de-ethyl, conjugate structure and benzene ring . The photocatalytic upgrading performance was recognized to the synergetic interface between ZnO@ZIF-C and Ag nanoparticles (NPs) with effective separation and suppressed the recombination of electrons and holes. It is suggesting that the electrons in the valence band (VB) of ZnO are excited to the conduction band (CB) and transferred to Ag NPs through the ZIF-C layer, then react with adsorbed oxygen to create superoxide radicals and degrade RhB into small molecules. After a five-consecutive operation, its photocatalytic efficiency by Ag/ZnO@ZIF-C (20 wt%) still maintains at 95.11 %. This work provides a promising method for the rational design of high-performance carbon doped photocatalysts for environmental remediation.
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RARE METALS
·
2022
·Vol. 42
·期 4
·1274-1282
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IF 6.318
Zha Ai-Yun,Zha Qing-Bing,Li Zhi,Zhang Hong-Min,Ma Xue-Feng,Xie Wen,Zhu Ming-Shan
Bisphenol A (BPA), one of the most commonly used plastic organic monomers, is widely used in manufacturing food packaging and containers. However, the gradual emissions of BPA from manufacturing plastic products bring great potential in human health threats, which urgently need to develop a simple and rapid method for detecting BPA. Cetyltrimethylammonium bromide (CTAB), a typical surfactant, is used to enhance the electrochemical detection of trace endocrine disruptors due to the fact that it can effectively enrich and absorb hydrophobic phenolic compounds through the hydrophobicity of its long-chain alkanes. Based on these, the present study reports a ternary composite of Au on zinc oxide/reduced graphene oxide nanosheets (Au/ZnO/rGO) as electrochemical sensor for detecting BPA. With the addition of CTAB, the analytic performances toward BPA detection are significantly improved 3.8 times compared with those without CTAB. The pH, accumulation potential and time are optimized. Moreover, the electrochemical activity of CTAB/Au/ZnO/rGO sensor is also evaluated by cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), differential pulse voltammetry (DPV) and scan rate. The sensor displays two linear range from 10 to 1340 nmol·L −1 and 1340 to 10,000 nmol·L −1 , and a low detection limit of 4.95 nmol·L −1 . Lastly, the sensor also exhibits good reproducibility, selectivity and potential practical application for BPA detection in real samples. Graphical abstract
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Journal of Energy Storage
·
2022
·
IF 8.907
Xiaorui Liu,Qingyu Wang,Bin Liu,Cheng Zhong,Wenbin Hu
Zinc–nickel battery attracts much attention because of their excellent rate performance and high operating voltage. However, their applications are strongly restricted by the poor cycling performance, which is caused by the degradation of the zinc anode during battery cycling. To overcome such limitation, a facile strategy to prepare homogeneously Bi 2 O 3 coated ZnO composites is proposed. The reaction is conducted in the liquid phase based on redox reaction of Bi 3+ and I − to directly grow BiOI on commercial ZnO powders, which are then converted to ZnO@Bi 2 O 3 by further heat treatment. Benefiting from the uniform Bi 2 O 3 coating, the solubility of ZnO is effectively reduced. The well-connected metallic Bi network is formed, which serves as the conductive substrate for uniform zinc deposition and hence inhibits the dendrites growth. The assembled zinc–nickel battery based on ZnO@Bi 2 O 3 composites exhibits significantly prolonged cycling life. Even under a high discharge current of 10 A (~ 138 mA cm −2 ), the battery can keep cycling during 400 cycles with discharge voltage higher than 1.1 V, which is extended by 3 and 1.7 times compared with that of electrodes based on pure ZnO and physical mixture of Bi 2 O 3 and ZnO. This work provides a facile strategy for synthesizing uniformly Bi 2 O 3 coated ZnO composites, which is helpful for large-scale synthesis of high-performance zinc anodes in practical application.
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JOURNAL OF MOLECULAR STRUCTURE
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2022
·
IF 3.841
Shuang Liang,Guanting He,Guozhe Sui,Jinlong Li,Dongxuan Guo,Ze Luo,Rongping Xu,Hong Yao,Chao Wang,Zhiyong Xing
Metal organic frameworks (MOFs) are considered as desirable precursors for the preparation of photocatalyst to improve photocatalytic hydrogen evolution efficiency due to the maintained special morphology. Herein, C-doped rod-like ZnO with porous structure has been successfully prepared by using ZIF-L as precursor via an optimized two-step calcination strategy, which is applied for photocatalytic hydrogen evolution reaction from water splitting. The results show that ZnO-350-450 exhibits the best photocatalytic activity with a hydrogen production rate of 0.35 mmol·g −1 ·h −1 , which is 1.9 times higher than that of ZnO-400 (0.184 mmol·g −1 ·h −1 ) under simulated sunlight illumination. The enhanced photocatalytic performance is attributed to the fact that the two-step calcination provides the regular porous rod-like structure (ZIF-L) and the inclusion of carbon in ZnO photocatalyst. C-doped ZnO with regular morphology offers faster charge transfer rate and higher charge separation efficiency, and the C-doped expands a wider range of light absorption. Overall, the presented work could provide a new idea for designing and preparing of photocatalysts with high efficiency for photocatalytic hydrogen production.
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CHEMPHYSCHEM
·
2023
·Vol. 24
·期 9
·e202200766
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IF 2.9
Lifen Wang,Xiaohan Li,Yu Jin,Guangqing Liu,Yun Shan
Graphical A feasible atomic-hybridization strategy is proposed to anchor carbon quantum dots onto ZnO microsphere surface via breakage of C=O bonds and subsequent Zn-3d and C-2p orbital hybridization, thus leading to coexistence of photoluminescence and magnetism in this multifunctional heterojunction with outstanding biocompatibility. Integrating ferromagnetism (FM) and photoluminescence (PL) into one particular nanostructure as biological probe plays an irreplaceable role in accurate clinical diagnosis combining magnetic resonance and photoluminescence imaging technology. However, magnetic emergence generally needs a spin polarization at Fermi level to display a half-metallic electronic feature, which is not beneficial for preserving radiation recombination ability of photo-excited electron-hole carriers. To overcome this intrinsic difficulty, we propose a feasible atomic-hybridization strategy to anchor carbon quantum dots (CQDs) onto ZnO microsphere surface via breakage of C=O bonds at CQDs and subsequent Zn-3d and C-2p orbital hybridization, which not only ensures the carrier recombination but also leads to a room-temperature magnetism. Herein, the photoluminescence and magnetism coexist in this multifunctional heterojunction with outstanding biocompatibility. This work suggests that integration of magnetism and photoluminescence could be accomplished by particular interfacial orbital hybridization.
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JOURNAL OF RARE EARTHS
·
2023
·
IF 4.9
Boxu Xu,Chao Song,Jie Song,Rui Huang,Shaomin Lin,Zhenxu Lin,Yi Zhang,Dejian Hou,Jun Song
In this study, Er 3+ /Yb 3+ codoped Y 2 O 3 –ZnO ceramic phosphors were prepared by sol–gel method. The samples had two emission bands, namely, green (535 nm) and red (660 nm), which are attributed to Er 3+ : 2 H 11/2 ( 4 S 3/2 ) → 4 I 15/2 and Er 3+ : 4 F 9/2 → 4 I 15/2 radiative transitions , respectively. The samples exhibited green- and red-emission intensity enhancement by 1.728 and 2.286 times that of the pure Y 2 O 3 host, respectively and by 514.468 and 214.341 times that of the pure ZnO host. The emission intensities are first enhanced by lattice expansion. With the change of Y:Zn ratio, the high surface energy is converted into low crystal surface resulting in the change of asymmetry crystal field for matrix. When the intensity of the asymmetric crystal field reaches maximum, both emissions are further boosted. When the high surface energy transforms into crystal surface energy, the microstructure changes into a compact mesoporous structure. Consequently, the chemical stability of the samples improves significantly, and the final emission band of the three samples with mesoporous structures is continuously red.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2023
·Vol. 34
·期 2
·1-12
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IF 2.8
Li Fei,Zhao Qian,Jia Rong,Hu Te,Lu Yun,Hao Liang
ZnO films immobilized on SUS316L wire mesh are prepared by a conventional low-temperature hydrothermal method. To improve their photocatalytic activity, we decorate the films with Ag nanospheres using the impregnating photoreduction treatment. The prepared films are characterized using a series of advanced analytical methods. The SEM and EDS results show that continuous films consisting of ZnO nanorods shaped as six-prism cones are formed in the hydrothermal process. Ag 0 nanospheres with the dimension from a few to several hundred nanometers decorate the ZnO nanorods. Compared to the individual ZnO film, Ag–ZnO heterojunction improves the absorption of UV and visible light, decreases the bandgap value, and shifts the band position toward more positive potentials. It also inhibits the recombination of photo-inspired electrons and holes, thereby improving the photodegradation ability. The photocatalytic performance of Ag–ZnO composite films increases at most 5.6-fold compared to the bare ZnO film. Active holes (h + ), superoxide ( \(\bullet {\text{O}}_{2}^{ - }\) ), and hydroxyl ( \(\bullet {\text{OH}}\) ) species play significant roles in organic dye RhB photodegradation under simulated sunlight irradiation.
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ACS Applied Materials & Interfaces
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2023
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IF 9.5
Xiaolong Su,Yaling Zhai,Chao Jia,Zhe Xu,Dianfeng Luo,Zhiyi Pan,Hengxue Xiang,Senlong Yu,Liping Zhu,Meifang Zhu
In the post-epidemic era, bio-based protective fiber materials with active protective functions are of utmost importance, not only to combat the spread of pathogens but also to reduce the environmental impact of petroleum-based protective materials. Here, efficient antibacterial polylactic acid-based (PLA-based) fibers are prepared by solution blow spinning and their pore structures are regulated by controlling the ratio of the solvent components in the spinning solutions. The porous PLA-based fibers exhibit antibacterial efficiencies of over 99% against Escherichia coli and over 98% against Bacillus subtilis, which are significantly higher than that of the nonporous PLA-based fibers. The excellent antibacterial property of the porous PLA-based fibers can be attributed to their high porosity, which allows antibacterial nanoparticles to be released more easily from the fibers, thus effectively killing pathogenic microorganisms. Moreover, pore structure regulation can also enhance the mechanical property of the PLA-based fiber materials. Our approach of regulating the microstructure and properties of the PLA-based fibers through pore engineering can be extended to other polymer fiber materials and is suitable for polymer-based composite systems that require optimal performance through sufficient exposure of doped materials.
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高影响因子
International Journal of Electrochemical Science
·
2023
·
IF 1.5
Fang Wang,Shu Xian Zhao,Han Zeng,Wen Shan Huo
Petaloid-shapedZnO grafted with 4,5-imidazoledicarboxylic acid was proposed as a composite to entrap Hemoglobin molecules through the synergistic effect of covalent bonding and adjacent complexation between the hetero-atoms of the imidazolyl ring andtheheme sites in Hemoglobin. The morphology, structuralfeatures, and physiochemical properties ofthecomposite with Hemoglobin anchoring were investigated by photography, spectroscopy, and electrochemicalmethods, as well as the mechanism of charge shuttle of the heme protein into the composite and the dynamics of enzymaticcatalysis. Experimental results revealed that intricate interactions between components of the complex and the integrated Hemoglobin molecules alter the mechanism of charge shuttle between cofactors in the enzyme and the conductive matrix with partial heme sites in coordination with the imidazolyl ring as an intra-molecular electron relay. Such interactions arealso responsible for theprocess of substrate binding for the cofactors in the redox protein. The rapid kinetics of heterogeneous charge convection is found to be 89.0 s -1 with a unique pattern of two electrons per proton. This interactions would also lead to a lower affinity to hydrogen peroxide (893.0 μM), a high detection limit (0.9 mM), inferior sensitivity (4.5×10 -5 A•L•mol-1) and moderate kinetics of substrate attachment and transformation (1.9×10 6 and 29.8 s -1 ).
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ChemSusChem
·
2023
·Vol. 16
·期 22
·e202300944
·
IF 8.4
Junyu Gao,Fan Wu,Yunxuan Zhao,Xuanang Bian,Chao Zhou,Junwang Tang,Tierui Zhang
Graphical Advanced ZnO/ZnCr 2 O 4 photocatalysts derived from ZnCr-layered double hydroxide (ZnCr-LDH) precursors are successfully synthetized by a simple thermal process. The optimized ZnO/ZnCr 2 O 4 exhibit a considerable ammonia photosynthesis rate of 31.7 μmol g −1 h −1 in pure water, with the origin of the high activity being derived from the high-efficiency carrier separation due to the abundant interfaces. Drawing inspiration from the enzyme nitrogenase in nature, researchers are increasingly delving into semiconductor photocatalytic nitrogen fixation due to its similar surface catalytic processes. Herein, we reported a facile and efficient approach to achieving the regulation of ZnO/ZnCr 2 O 4 photocatalysts with ZnCr-layered double hydroxide (ZnCr-LDH) as precursors. By optimizing the composition ratio of Zn/Cr in ZnCr-LDH to tune interfaces, we can achieve an enhanced nitrogen photofixation performance (an ammonia evolution rate of 31.7 μmol g −1 h −1 using pure water as a proton source) under ambient conditions. Further, photo-electrochemical measurements and transient surface photovoltage spectroscopy revealed that the enhanced photocatalytic activity can be ascribed to the effective carrier separation efficiency, originating from the abundant composite interfaces. This work further demonstrated a promising and viable strategy for the synthesis of nanocomposite photocatalysts for nitrogen photofixation and other challenging photocatalytic reactions.
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ACS Applied Nano Materials
·
2023
·
IF 5.9
Linlin Qian,Canxiang Fang,Yanghai Gui,Kuan Tian,Huishi Guo,Dongjie Guo,Xiang Guo,Peng Liu
NO2 is a very dangerous and toxic gas and is prone to cause acid rain in high humidity environments, so it is essential to prepare a real-time monitoring and humidity immunity NO2 sensor. WO3 nanomaterials are commonly applied to detect NO2, but their poor immunity to humidity is still a critical limitation for the application. ZnO-nanorod-decorated WO3 nanosheets coated with ZIF-71 (ZnO@ZIF-71/WO3) composites prepared by an in situ growth method displayed excellent gas sensing performance and good humidity immunity to detect NO2. Compared to WO3 nanosheets and ZnO-nanorod-decorated WO3 nanosheets (ZnO/WO3) heterojunction composites grown on ceramic substrates in situ, ZnO@ZIF-71/WO3 presented excellent selectivity, good long-term stability, and a remarkably high response of about 947.96 to 100 ppm NO2 at 180 °C, which is 3.07 times higher than that of the ZnO/WO3 sensor and 4.59 times higher than that of the pure WO3 sensor. Even at a relative humidity of 85%, the response of ZnO@ZIF-71/WO3 to NO2 remained essentially constant. The functional ZIF-71 layer not only improved the humidity immunity of ZnO@ZIF-71/WO3 but also enhanced the sensitivity and selectivity performance to NO2 at low operating temperatures. The ZnO@ZIF-71/WO3 sensor still provided a response of 88.41 to 100 ppm NO2 at room temperature.
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CARBOHYDRATE POLYMERS
·
2023
·
IF 11.2
Weina Wu,Ying Zhou,Jiefeng Pan,Yingying Wu,Gulden Goksen,Ping Shao
In this study, F-ZnO NPs were used as antibacterial agents , mussel bionic dopamine exerted its adhesive action to immobilize F-ZnO NPs on the pectin/CNF aerogel skeleton. Fruit and vegetable antimicrobial mats with safety, long duration of action and high efficiency were prepared and its potential application has been investigated. The results showed that a dopamine layer was deposited on the surface of the CNF , which promoted the tight adhesion of the F-ZnO NPs to the aerogel skeleton. The F-ZnO@D-CNF aerogel exhibited a slow release of zinc ions , with the first two days being 0.40 ± 0.16 and 1.01 ± 0.13 mg/mL. The aerogel was light, can stand on the petals without collapsing, has regular and uniform pore structure , good tensile/compressive properties and high antibacterial/anti-fungal properties. Strawberries packaged with F-ZnO@D-CNF aerogel exhibited an extended shelf life of 5 days. Additionally, the strawberries maintained a soluble solid content of 6.9 ± 0.82 % and a Vc content of 44.67 ± 3.51 mg/100 g. The weight loss, color and firmness were also notably superior to the other four groups. The final concentration of zinc ions in strawberries was 3.71 ± 0.28 μg/g, which is far below the recommended dietary intake.
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