JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2021
·
IF 8.128
Jingjing Liu,Bicheng Zhu,Liuyang Zhang,Jiajie Fan,Jiaguo Yu
It is imperative to seek for novel materials with pronounced gas sensing performance towards triethylamine for the sake of human health. Herein, we successfully fabricate an outstanding triethylamine sensor based on CdS/ZnO composite with 0D/2D structure, which are prepared by in-situ growth of CdS quantum dots on ultra-thin ZnO nanosheets . The ratios between the two ingredients are adjusted and their effect is evaluated. The optimal sample exhibits the lowest operating temperature of 200 °C, the highest response value of ~20 and the fastest response time of 2 s. Besides, it also has the virtues of durable stability, excellent selectivity and superior anti-interference ability. The mechanism behind the aforementioned intriguing performance is investigated by X-ray photoelectron spectroscopy, Kelvin probe and density function theory (DFT) simulation. All the results verify that the enhanced gas sensing properties are derived from splendid 0D/2D structure, n - n heterojunction and large specific surface area. Additionally, this study opens an avenue for designing sensors with 0D/2D structure.
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PubMed
高影响因子
LANGMUIR
·
2020
·
IF 3.557
Huanhuan Xu,Wei Fang,Lan Xu,Fujuan Liu
Composite nanofiber membranes (CNFMs) loaded with CuO/ZnO (CZCNFMs) have important applications in a series of organic and industrial catalytic reactions because of nanoeffects of the nanofibers and the peculiar performances of semiconductor oxides. In this work, CZCNFMs with different mass ratios of Cu to Zn were successfully fabricated in batches using modified bubble electrospinning (MBE), a heat treatment method, and a hydrothermal method. The influences of the mass ratio of Cu to Zn on the morphologies, structures, and properties of the CNFMs were studied, and the obtained CNFMs with different mass ratios of Cu to Zn were applied to the photodegradation of methyl orange (MO) and methylene blue (MB). The results showed that when the mass ratio of Cu to Zn was 5:5, the fabricated CNFM had better morphology, structure, and mechanical properties and had the best degradation effects on MO and MB. In addition, the principal active substances produced during the photodegradation of MO were defined by free radical capture experiments, and the influences of the pH value of the MO solution on the photocatalytic activity of the CNFMs with the optimal mass ratio of 5:5 were discussed.
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PubMed
高影响因子
JOURNAL OF NUCLEAR MATERIALS
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2020
·
IF 2.485
Guilin Wei,Xiaoyan Shu,Zhentao Zhang,Fen Luo,Yi Liu,Bingsheng Li,Yi Xie,Lan Wang,Xirui Lu
The treatment of radioactive iodine waste is particularly difficult because of its volatilization issues. In this study, amorphous silica gel was used to gradually replace crystalline SiO 2 in B 2 O 3 -Bi 2 O 3 -ZnO-SiO 2 based materials aimed to investigate the effects on iodine waste immobilization. Samples with different silica gel replacements (0, 20, 40, 60, 80, and 100%) were characterized by XRD, FT-IR, and SEM-EDS. The results showed that silica gel had a benefit in the immobilization of iodine waste at low-sintering temperatures (500, 550, and 600 °C). At 550 °C, AgI was immobilized in the pure glassy matrix and elements (Ag and I) distributed uniformly on the matrix surface. FT-IR analysis presented the tetrahedral SiO 4 units in the sintered samples that were mainly in the form of sheets. Our work revealed the potential application of silica gel in the field of iodine waste immobilization.
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高影响因子
ANNALS OF NUCLEAR ENERGY
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2020
·
IF 1.378
Guilin Wei,Fen Luo,Bingsheng Li,Yi Liu,Jingjun Yang,Zhentao Zhang,Yi Liu,Xiaoyan Shu,Yi Xie,Xirui Lu
This study mainly investigated the Bi 2 O 3 -B 2 O 3 -ZnO ternary glass to immobilize the iodine waste forms under low sintering temperatures (≤600 °C). Based on the results of Molecular Dynamic (MD) code GULP and amorphous fraction, the Bi 2 O 3 -B 2 O 3 -ZnO ternary glass with 20 mol% Bi 2 O 3 to be chosen to immobilize the sliver-coated silica gel with 10 wt%, 20 wt% and 30 wt% iodine loadings (total content of iodine is 8 wt%). The results show that the amorphous fraction are increased with temperature rising and the composition has dominant effect on determining the density results. The specimen with 20 wt% sintered at 600 °C has the highest amorphous fraction as 0.71. The SEM-EDS results reveal that part of iodine had been physically solidified in the form of white spots and the rest chemically solidified in the glassy phase. Our findings demonstrate the potential of Bi 2 O 3 -B 2 O 3 -ZnO ternary glass to immobilize iodine waste forms.
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高影响因子
Catalysts
·
2021
·Vol. 11
·期 1
·77
·
IF 4.146
Shiwei Ma,Yunyun Huang,Ruoyu Hong,Xuesong Lu,Jianhua Li,Ying Zheng
In this work, zinc oxide (ZnO) nanoparticles were modified in a circulating fluidized bed through argon and hydrogen (Ar–H) alternating-current (AC) arc plasma, which shows the characteristics of nonequilibrium and equilibrium plasma at the same time. In addition, a circulating fluidized bed with two plasma jets was used for cyclic processing. The catalytic degradation performance on Rhodamine B (Rh B) by Ar–H plasma-modified ZnO and pure ZnO was tested in aqueous media to identify the significant role of hydrogen atoms in Rh B degradation mechanism. Meanwhile, the effects of plasma treatment time on the morphology, size and photocatalytic performance of ZnO were also investigated. The results demonstrated that ZnO after 120-min treatment by Ar–H plasma showed Rh B photocatalytic degradation rate of 20 times greater than that of pure ZnO and the reaction follows a first kinetics for the Rh B degradation process. Furthermore, the photocatalyst cycle experiment curve exhibited that the modified ZnO still displays optimum photocatalytic activity after five cycles of experiment. The improvement of photocatalytic activity and luminescence performance attributes to the significant increase in the surface area, and the introduction of hydrogen atoms on the surface also could enhance the time of carrier existence where the hydrogen atoms act as shallow donors.Keywords:plasma;zinc oxide;photocatalysis;nanomaterials
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高影响因子
CATALYSIS COMMUNICATIONS
·
2020
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IF 3.612
Pengbo Wang,Qian He,Hao Zhang,Qingdi Sun,Yujie Cheng,Tao Gan,Xiaohui He,Hongbing Ji
Several research studies have been conducted on N -formylation of amines using phenylsilane and CO 2 . However, most of these studies involved tedious processes of catalyst preparation or complex procedures. In the present study, we describe the use of a simple and commercially available ZnO catalyst for selective N -formylation of amines under mild condition. High-yielding N -formylation products with good recyclability and wide substrate scope were obtained, which can promote fine chemical synthesis and CO 2 capture.
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高影响因子
Optoelectronics Letters
·
2020
·Vol. 16
·期 4
·293-297
·
IF 0
Li Peng,Zhang Hong-yan,Li Zhi-jun,Zhang Jun
The influence of polyvinylpyrrolidone (PVP) and monoethanolamine (MEA) as surfactants on photoluminescence (PL) of Eu-doped ZnO (ZnO:Eu) has been studied. X-ray diffraction (XRD) results show that there are more Eu 3+ ions to replace Zn 2+ ions into ZnO lattice for ZnO:Eu in the presence of surfactant MEA. From the spectral analysis for ZnO:Eu with different surfactants by Gaussian deconvolution, it can be seen that the use of MEA as a surfactant affects the energy transfer from ZnO host to Eu 3+ ions and leads to three new emission peaks, including UV emission (389 nm), violet emission (411 nm) and green emission (506 nm).
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CATALYSIS LETTERS
·
2020
·Vol. 150
·期 10
·2863-2872
·
IF 2.482
Zhang Pingbo,Chen Yifeng,Zhu Mengnan,Yue Chengguang,Dong Yuming,Leng Yan,Fan Mingming,Jiang Pingping
Magnetic mesoporous CoFe 2 O 4 @(CaO–ZnO) exhibited good catalytic activity in the transesterification of glycerol and dimethyl carbonate to yield glycerol carbonate. The glycerol conversion of 97.7% and glycerol carbonate yield of 96.9% could be obtained in this reaction system under the optimized reaction conditions. CoFe 2 O 4 @(CaO–ZnO) was characterized by a series of techniques including TPD, XRD, SEM, TEM, EDS, VSM and BET to evaluate the physico-chemical properties of the catalyst. It was demonstrated that the interaction of acid–base sites improved the catalysis performance of CoFe 2 O 4 @(CaO–ZnO): the strong basic sites were beneficial to the activation of glycerol to glyceroxide anion which could increase glycerol conversion, and the acid site contributes to the carbonyl activation of dimethyl carbonate, converts glyceroxide anion to glycerol carbonate, and improves the selectivity of glycerol carbonate. Meanwhile, the solid–liquid separation process after reaction would be simplified significantly considering CoFe 2 O 4 @(CaO–ZnO) could be easily separated from the reaction mixture under magnetic action. Graphic Abstract Acidic–basic bifunctional magnetic mesoporous CoFe 2 O 4 @(CaO–ZnO) was used as a solid base catalyst for the glycerol transesterification. Basic sites were beneficial to the activation of glycerol to glycerol oxygen anion to increase glycerol conversion and acidic sites were beneficial to carbonyl activation of DMC to increase glycerol carbonate selectivity. With magnetism, the solid base catalyst was easily recovered.
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高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2020
·Vol. 31
·期 12
·9550-9558
·
IF 2.22
Zheng Jiahong,Cheng Kangkang,Wu Yuntao,Yu Pengfei
This work reports a molecularly imprinting polymer based on environmentally friendly and non-toxic ZnO quantum dots for the selective detection sulfadimidine. The MIP@ZnO was prepared by sol–gel method, which usedZnO quantum dots, TEOS, APTES, ammonia as signal materials, cross-linker, function monomer, and initiator, respectively. Result proved that MIP@ZnO exhibited excellent selective fluorescence quenching in the presence of sulfadimidine, good linear relationship in the range of 0–40 μmol L −1 with a correlation coefficient ( R 2 ) of 0.98547 was obtained, and the imprinting factor was 2.83. Furthermore, MIP@ZnO has been successfully applied for detection SM 2 in real samples with the spiked recoveries ranging from 95.6 to 99.8% with RSD below 2.38%.
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高影响因子
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
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2020
·
IF 2.717
Wentao Hu,Xi'an Fan,Zigui Luo,Fan Luo,Guangqiang Li,Jian Wang
In this work, Fe/ZnO soft magnetic composite (SMC) is prepared successfully by sol-gel method combined with a pyrolysis process. Formation mechanism and effect of annealing on magnetic properties for the Fe/ZnO SMCs are studied in detail. The results show that Fe/zinc acetate hydrogel mixture will be decomposed into the Fe/ZnO composites by heating above 340 °C. And ZnO is well coated on the surfaces of Fe particles. The Fe/ZnO composite compact has lower total core loss and better frequency stability of magnetic permeability compared with pure Fe compact. In addition, annealing treatment shows an enhanced effect on the magnetic properties for the Fe/ZnO composite compact such as reduced coercivity and increased permeability. The annealed Fe/ZnO SMCs can keep stable magnetic permeability (26) from 50 Hz to 10 kHz, high magnetic induction (1.65 T) and a relatively low core loss of 91.11 kW/m 3 measured under a magnetic flux density of 30 mT at 10 kHz. Therefore, the Fe/ZnO soft magnetic composites prepared by the above-mentioned method provide a great potential application in electromagnetic conversion equipment.
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高影响因子
CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
Jie Liang,Xuetong Zhao,Jianjie Sun,Lulu Ren,Ruijin Liao,Lijun Yang,Weiwei Li
ZnO varistor ceramics are synthesized by spark plasma sintering (SPS), and then annealed in a conventional furnace in air atmosphere. Dense microstructure with more than 98% of theoretical density is achieved, and homogenous ZnO grains with typical second phases such as Zn 7 Sb 2 O 12 spinel, Zn 2 Bi 3 Sb 3 O 14 pyrochlore are observed from X-ray diffraction spectra (XRD) and scanning electron microscopy (SEM). In addition, a metallic Bi phase is also observed, which is resulted from the reduction of Bi 2 O 3 because of inherent low oxygen partial pressure of SPS, and it can be reoxidized after a post-annealing process. The breakdown field of the optimum ZnO varistor ceramic is 725 V/mm with a nonlinear coefficient of 53.5, which stems from its high Schottky barrier height of 0.60 eV. In analysis of dielectric spectra from 173 K to 293 K, two relaxation peaks with activation energy of 0.22 eV and 0.48–0.54 eV can be observed, which are attributed to the intrinsic zinc interstitial and defect of grain boundary or intergranular phase, respectively. The grain boundary resistances are discussed according to Cole-Cole plot, from which the activation energy controlling resistance at the grain boundary is determined to be 0.87 eV.
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高影响因子
CARBON
·
2020
·
IF 8.821
Binpeng Zhang,Dongjie Yang,Xueqing Qiu,Yong Qian,Huan Wang,Conghua Yi,Dongqiao Zhang
The application of ZnO nanoparticles as photocatalyst is significantly hampered by limited absorption range for solar spectrum, fast recombination of photogenerated carriers and poor recyclability . The modification with carbon structures has attracted attention as their advantageous performance in photocatalysis . Herein, we first report a lignin-derived flower-like carbon (LFC), which is used to modify ZnO. The resulting composite (ZnO/LFC) is composed of ZnO nanoparticles (∼10 nm) embedded on a flower-like carbon consisting of two-dimensional corrugated nanosheets . Especially, LFC exhibits stable three-dimensional structure and rich oxygen-containing functional groups. So ZnO can be uniformly anchored on the LFC. Composite presents an extended optical absorption and enhanced separation of photogenerated carriers due to the interface electronic interaction between ZnO and LFC. The hierarchical flower-like structure facilitates fast substance transfer and high light-harvesting efficiency. Therefore, ZnO/LFC presented an excellent photocatalytic activity toward degradation of sulfamethazine and hydrogen evolution , which were about 3.0 and 2.1 times that of pure ZnO, respectively. Moreover, the recyclability of composite photocatalyst was also significantly better than pure ZnO. This work not only provides a facile, low-cost and scalable strategy to promote practical application of photocatalyst but also opens new path toward the high-value utilization of industrial lignin.
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高影响因子
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