RSC Advances
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2017
·Vol. 7
·期 50
·31654-31662
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IF 3.108
Jun Wang,Xilin Wang,Youwei Yao,Juyi Guo,Xiaogang Ouyang,Zhidong Jia
The application of polymer composites with electric field dependent nonlinear conductive and dielectric characteristics for high voltage equipment is an effective method to control electric field stress and disperse space charges. In this study, core-satellite CaCu3Ti4O12@ZnO fillers were synthesized and doped into silicone rubber composites, and compared to a mixture of CaCu3Ti4O12 and ZnO with the same filler concentration. The composites exhibited both nonlinear conductive and nonlinear dielectric properties with nanoparticle fillers for the first time. Both the nonlinear conductive coefficient and dielectric coefficient increased with filler concentration. The classical current-path model was utilized to explain the nonlinear conductive properties, while the interface-barrier-layer-capacitor model and double-depletion-layer model were introduced to explain the nonlinear dielectric properties, which would broaden the thinking for the fabrication of nonlinear composites.
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SENSORS AND ACTUATORS B-CHEMICAL
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2017
·
IF 5.401
Xiao Liu,Ye Sun,Miao Yu,Yongqi Yin,Baosheng Du,Wei Tang,Tingting Jiang,Bin Yang,Wenwu Cao,Michael N.R. Ashfold
Ultrathin two-dimensional ZnO nanosheets (NSs) with thicknesses of just a few nanometers have been fabricated by a solvothermal method. The very large surface area to volume ratio of this material translates into outstanding electrical sensing responses to ethanol (as high as S ∼ 97 to 200 ppm of ethanol at a working temperature of 320 °C). Decorating these ZnO NSs with CuO nanoparticles (NPs), by pulsed laser ablation of a CuO target at room temperature and then post-annealing at 400 °C, yields CuO-ZnO NSs that display a further up to 2-fold enhanced response to ethanol vapour, reduced sensor response and recovery times, high sensing repeatability and high selectivity. Mechanisms underpinning the enhanced sensing properties of the CuO-ZnO NSs are discussed in terms of CuO NP-induced p - n junction depletion regions and increases in the density of active sites for ethanol adsorption and for reaction with adsorbed oxygen species.
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International Journal of Refrigeration
·
2025
·
IF 3.8
Yuxin Yang,Rixin Zhang,Rui Liang,Yike Gao,Chenyang Zhang,Junwei Cui,Shengshan Bi
In this work, ZnO nanoparticle was surface modified with the PFPE-acid as ligand. The modified ZnO particle size was about 30 nm measured by SEM. The modified ZnO/HFE-7100 nano-coolants with mass fractions of 0.10 % - 0.40 % were prepared and characterized, and their dispersion stabilities were evaluated by visual sedimentation and UV spectrophotometer. Then the thermal conductivities of these nano-coolants were measured using a visualized transient hot-wire system. Results show that the thermal conductivity of the modified ZnO/HFE-7100 nano-coolants increased with the increasing mass fraction of nanoparticles and temperature, and 4.94 %-16.24 % enhancement were found compared to the base fluid. Based on the experimental data, a thermal conductivity model of nano-coolant was developed, and the deviation of the calculated thermal conductivity from the experimental value was less than ± 1.10 %.
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ACTA PHYSICO-CHIMICA SINICA
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2024
·
IF 10.8
Asif Hassan Raza,Shumail Farhan,Zhixian Yu,Yan Wu
This work illustrates the novelty of double S-scheme ZnS/ZnO/CdS ternary heterojunction photocatalyst with efficient photocatalytic activity. The sample with optimal CdS content, ZnS/ZnO/CdS-14% (ZZC14%), displayed the maximum H 2 evolution rate of 4.1 mmol·g ‒1 ·h ‒1 . The maximum photocatalytic performance was approximately 2 and 13 times higher than their corresponding counterparts, ZnS/CdS and ZnO/ZnS, respectively. A high AQE of 19.8% under 420 nm was obtained. Additionally, the slight changes in H 2 evolution activities and retentions of crystal structures after six successive cycles indicate the stability of the photocatalyst. In accordance with the theoretical calculations and experimental results, the remarkable enhancement in photocatalytic activity is attributed to fast electron transfer and separation as well as the intimate contact due to mutual interaction between S-scheme. This work highlights an innovative approach to constructing a dual S-scheme photocatalytic system with high separation and fast migration capabilities of photogenerated charge carriers for splitting water to produce hydrogen. Download: Download high-res image (131KB) Download: Download full-size image
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CERAMICS INTERNATIONAL
·
2017
·
IF 2.986
Jun Feng,Ling Cheng,Jingdong Zhang,Otieno Kevin Okoth,Fang Chen
In this work, a BiVO 4 /ZnO composite film was fabricated via a combination of the liquid phase deposition technique and the successive ionic layer adsorption and reaction (SILAR) process. Scanning electron microscopy and X-ray diffraction observations revealed that wurtzite ZnO and monoclinic BiVO 4 were successfully formed in the composite film. UV–visible spectra indicated that the formation of the BiVO 4 /ZnO film resulted in improved absorption and an obvious redshift. Photoluminescence analysis revealed that the BiVO 4 /ZnO film exhibited superior charge-transfer properties to pure ZnO and BiVO 4 films. The fabricated BiVO 4 /ZnO film was applied to the photoelectrocatalytic (PEC) degradation of tetracycline. The BiVO 4 /ZnO film showed higher visible-light PEC activity than did pure ZnO and BiVO 4 films. Moreover, the tetracycline degradation efficiency achieved by the PEC process over the BiVO 4 /ZnO film was higher than those achieved using the photolysis, electrochemical oxidation , and photocatalysis processes. The BiVO 4 /ZnO film was able to effectively remove more than 90% tetracycline when the initial concentration of tetracycline was lower than 10 mg/L.
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Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Kexin Zhu,Fuping Zeng,Zhihui Li,Langlang Lv,Hua Jiang,Guangzhi Chen,Xiangyu Wang,Ju Tang
In this study, CuO-ZnO has been found to decompose sulfur hexafluoride (SF 6 ) with the activity higher than pure metal oxides (e.g. Al 2 O 3 ). After using the organic metal nanocage ZIF-8 as a precursor, the resulting CuO-ZnO particles exhibit uniform nanoscale size and possess an excellent surface area. When these particles are mixed with CaO and reacted with SF 6 at 600 °C and 0.2 MPa, a high SF 6 conversion rate of up to 99 % is achieved, with SO 2 making up about 98 % of the sulfur-containing products. Besides, the reaction demonstrates excellent degradation efficiency and maintains good stability over a continuous 78-hour operation. The results indicate that the CuO-ZnO particles provide abundant active sites that promote SF 6 adsorption and bond cleavage. Meanwhile, CaO helps disperse the CuO-ZnO particles, inhibits sintering, and provides an oxygen source for SO 2 formation, while also facilitating the fixation of fluorine, thereby enhancing both the selectivity and stability of the reaction. In addition, we also found that NH 3 is more conducive to promoting the decomposition of SF 6 by CuO-ZnO, whereas O 2 inhibits the progression of this reaction. Considering the global warming potential and long-term environmental impact of SF 6 , the proposed approach shows high degradation efficiency, excellent stability, and selectivity, contributing to mitigating the negative impact of SF 6 on global climate change.
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Journal of the Iranian Chemical Society
·
2024
·
IF 2.2
Fan Zhen,Li Chunxia,Xu Meijie
ZnO/Ag nanocomposite was prepared via in situ method by using silver nitrate and ZnSO 4 as the raw material. ZnO and ZnO/Ag were characterized by utilizing SEM, UV-vis, XRD, FTIR, and so on. The photocataytic degradation behaviors of ZnO and ZnO/Ag for trimethylamine (TEA) in air and solution were studied. The results indicated that ZnO/Ag had better photocatalytic degradation properties on trimethylamine under the condition of 0.06 g catalyst, 2 h photocatalytic time, and 15 A light intensity, and the degradation rates of TEA were up to 44 and 67% in air and solution, respectively. Furtherly, ZnO and ZnO/Ag also indicated perfect photocatalytic degradation properties toward to organic compounds in wastewater. Especially, the harmless treatment of triethylamine was achieved by using photocatalytic degradation method that provided a novel method for treating triethylamine. In all the above results leaded to a good application prospect of ZnO/Ag in the degradation of organic compounds in air and solution.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2024
·
IF 4.9
Han Yu,Hongliang Xu,Tianran Hao,Yucao Yuan,Bing Zhang,Hailong Wang,Gang Shao,Bingbing Fan,Hongxia Lu
ZnO/halloysite nanotube composites (ZH-X, X = 10, 30, 40, 50, 70), with different mass ratio of ZnO to halloysite nanotubes (HNTs), were fabricated successfully via a facile wet chemical technique in anhydrous ethanol under a mild reaction condition. ZnO nanoparticles about 9 nm in size were inhibited from agglomeration and loaded homogeneously on the surface of HNTs. The microstructure, specific surface area, light absorption ability, photocatalytic performance, etc. of the ZH-X composites varied with the mass ratio of ZnO to HNTs. All ZH-X composites displayed better photocatalytic performance than pure ZnO sample did. With the increasing of ZnO content, the photocatalytic activity of ZH-X composite toward degrading methylene blue (MB) solution strengthened gradually and reached the maximum by ZH-40 composite (with ZnO content of 28.57 wt%), then decreased step by step. ZH-40 (0.05 g) removed 99.88% of MB (100 mL, 15 mg/L) after adsorption in dark and then photocatalytic degradation for 60 min, and whose photocatalytic reaction rate constant was 5.73 times that of pure ZnO. The enhanced photocatalytic efficiency of ZH-40 composite was attributed to the interfacial effect of ZnO and HNTs as well as the dispersed ZnO nanoparticles, which maintained the adsorption ability of HNTs and improved the separation and migration of photo-generated electron and hole pairs. This work provides a feasible method for loading photocatalyst on clay mineral to realize efficient photocatalysis.
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SENSORS AND ACTUATORS B-CHEMICAL
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2024
·
IF 8
Yue Sun,Zhuo Liu,Yuchi Zhang,Le Han,Yan Xu
Photoexcitation is an effective method to promote specific gas sensing performance of semiconductor for electronic device. In this work, an interlayered Ti 3 C 2 T X /TiO 2 /ZnO ternary nanoarchitecture was successfully prepared via sequential etching-intercalation and pyrolysis methods, for which the ZIF-8 nanoparticles were initially incorporated into the adjacent interlayers of laminated Ti 3 C 2 T X MXene derived from HF-etching of Ti 3 AlC 2 MAX phase. The resultant multilayered Ti 3 C 2 T X /ZIF-8 nanocomposite was pyrolyzed at 400 o C to form Ti 3 C 2 T X /TiO 2 /ZnO ternary heterostructure , showing high triethylamine (TEA) sensing performance with R a /R g = 98 at 270 o C under 620 nm red-light irradiation, which is 3.1 times higher than that of the value measured under darkness. A rapid response/recovery time of 17 s/86 s is achieved, and it shows excellent TEA sensing selectivity and long-term cyclic stability. The close-stacked nano-/microstructure of Ti 3 C 2 T X /TiO 2 /ZnO effectively contribute to the diffusion and permeation of gas molecules, as well as the photogeneration and migration of charge carriers, leading to its outstanding photoactivated TEA sensing performance. This work provides a feasible approach to exploring high-performance Mxene hybrids for ultrasensitive TEA monitoring.
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JACS Au
·
2025
·
IF 8.7
Xuan Bie,Yukun Pan,Xiaowei Wang,Shiyu Zhang,Jiahui Hu,Xiaoxiao Yang,Qinghai Li,Yanguo Zhang,Robert E. Przekop,Yayun Zhang,Hui Zhou
Gas sources rich in CO2 derived from biomass/waste gasification, anaerobic digestion, or industrial carbon capture often contain impurities such as H2S, H2O, and NH3, which can significantly hinder catalyst performance. Here, we show the role of NH3 on the reverse water–gas shift (RWGS) reaction over a commercial Cu/ZnO/Al2O3 catalyst, examining its effects on both the catalytic activity and the catalyst structure. We found that NH3 reversibly decreases CO2 conversion immediately by suppressing carbonate hydrogenation and CO desorption. This effect intensifies with an increase in NH3 concentration but decreases at higher temperatures. However, prolonged exposure (over 100 h) to RWGS conditions in the presence of 1.4% NH3 leads to near-total and irreversible deactivation of the Cu/ZnO/Al2O3 catalyst. Under NH3 exposure, the catalyst loses Cu+ sites on the surface, causing a spatial separation of Cu and ZnO. Finally, to address this challenge, we propose a novel strategy to mitigate NH3 inhibition by decomposing NH3 into N2 and H2.
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PubMed
高影响因子
NanoImpact
·
2017
·
IF 0
Xiaolong Wang,Fengxia Yang,Jing Zhao,Yan Xu,Daqing Mao,Xiao Zhu,Yi Luo,P.J.J. Alvarez
Bacterial exposure to ZnO nanoparticles (nZnO) at sublethal concentrations (1 to 10 mg/l) for 24 h significantly increased the conjugative frequency of antibiotic resistance plasmid RP4. A 24.3-fold increase was observed in E . coli pure cultures, and an 8.3-fold increase occurred in a mixed culture of indigenous aquatic microbiota. In addition, nZnO increased by three fold the transformation efficiency of E . coli via the uptake of naked plasmid pGEX4T-1, which was confirmed by confocal fluorescence microscopy. Enhanced horizontal transfer of resistance plasmids was a nanoparticle-specific effect, since 5.3 mg/l Zn 2 + (representing the maximum release of Zn 2 + from 10 mg/l nZnO) did not enhance RP4 transfer or pGEX4T-1 uptake frequency. This phenomenon was attributed to increased bacterial cell permeability after exposure to nZnO (but not to Zn 2 + ), which was confirmed by flow cytometry with propidium iodide staining. Overall, this study forewarns that accidental or incidental release of nZnO may facilitate environmental dissemination and propagation of antibiotic resistance genes through horizontal gene transfer.
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Processes
·
2025
·Vol. 13
·期 1
·253
·
IF 2.8
Sitong Liu,Shicheng Liu,Letao Li,Letong Yang,Xiaodong Wu,Zhichun Si,Rui Ran,Hui Wu
In this study, a combination of calcination and hydrothermal methods was employed to synthesize a honeycomb-like ZnO/g-C3N5(ZCN) heterojunction in situ. The ZCN heterojunction photocatalyst exhibits remarkable photocatalytic degradation performance, achieving a 97% methyl blue (MB) degradation rate with the rate constant of 0.0433 min−1(almost twice that of ZnO). Optical performance tests reveal that the ZCN heterojunction broadens the absorption edge to 710 nm and enhances the charge carrier separation. The presence of abundant oxygen vacancies, as revealed by X-ray photoelectron spectroscopy analysis, effectively suppresses the recombination of photogenerated electron–hole pairs. Furthermore, density functional theory simulations indicate that the combination of ZnO and g-C3N5creates an internal electric field due to their differing work functions. This leads to the formation of a Z-scheme heterojunction that effectively suppresses charge carrier recombination and preserves the strong redox capabilities of ZnO and g-C3N5. Finally, electron spin resonance results indicate thatO2−and OH are the primary active radicals involved in the degradation process. This study introduces a potential approach for the development of highly efficient Z-scheme photocatalysts for water treatment applications.
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