RSC Advances
·
2016
·Vol. 6
·期 75
·71061-71069
·
IF 3.289
Zhiping Zhou,Kai Lu,Xiao Wei,Tongfan Hao,Yeqing Xu,Xiaodong Lv,Yufeng Zhang
Due to tetracycline (TC) being harmful to the environment and animals, versatile fluorescent sensors have been developed and applied for the specific recognition and determination of TC. In the present paper, a mesoporous fluorescent sensor was successfully prepared by using TC as the template, cetyl trimethyl ammonium bromide (CTAB) as the porogen, and ZnO nanorods (NRs) as the core substrate material and optical material. The synthesized composite materials were characterized by transmission electron microscopy (TEM) and X-ray diffraction (XRD). Fluorescent measurements of the target TC were then measured by a spectrofluorometer. Under optimal conditions, the linear range and correlation coefficient of the mesoporous MIPs-ZnO NRs were 2.0–120 μmol L−1 and 0.9993, respectively, and the imprinting factor (IF) was up to 3.50. Moreover, in order to further investigate the effect of the mesoporous structure, a fluorescent sensor without a mesoporous structure was synthesized as a comparison and measured by the same processes. Through analysis of the data, it was found that the mesoporous fluorescent sensor showed a lower response time, higher utilization, and higher selective recognition and sensitive determination than the non-mesoporous fluorescent sensor. This study provides a novel strategy to fabricate mesoporous-imprinted polymer layer-coated ZnO NRs with excellent fluorescent performance for TC.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2016
·
IF 3.014
Yaqin Chen,Jiafeng Wu,Weisen Yang,Yuanyuan Fu,Rihui Zhou,Shouhui Chen,Lixue Zhang,Yonghai Song,Li Wang
Transition metal oxides@carbon(C) nanocomposites with hierarchical three-dimensional (3D) core-shell nanoarchitectures, large surface area and high electrical conductivity as anode materials for lithium ion batteries (LIBs) are very desirable. Herein, we developed a simple and feasible route to fabricate novel hierarchical 3D ball-in-ball ZnO/ZnFe 2 O 4 @C nanospheres with well-defined hollow microstructures via one-step carbonization of Zn/Fe-metal organic frameworks for the first time. The as-prepared hierarchical 3D ball-in-ball ZnO/ZnFe 2 O 4 @C nanospheres were carefully characterized by scanning electron microscopy, energy dispersive X-ray spectroscopy, X-ray photoelectron spectroscopy, X-ray powder diffraction, thermogravimetric analysis , N 2 adsorption/desorption isotherm, transmission electron microscopy and electrochemical techniques . The results showed ultrafine ZnO and ZnFe 2 O 4 nanocrystals were uniformly encapsulated by few carbon layers which was derived from in-situ carbonization of the organic ligands. Benefiting from their special hollow nanoarchitectures, ultrafine ZnO and ZnFe 2 O 4 nanocrystals encapsulated by a few carbon layers, large specific surface area and high electrical conductivity, the hierarchical 3D ball-in-ball ZnO/ZnFe 2 O 4 @C nanospheres presented high reversible capacities of 1283 and 1100 mA h g −1 after first 100 cycles and the following 100 cycles at current density of 100 and 200 mA g −1 , respectively. A high specific capacity of 155 mA h g −1 was obtained at relatively large current rates of 20 A g −1 .
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Inorganic Chemistry Frontiers
·
2017
·Vol. 4
·期 12
·2088-2096
·
IF 4.036
Benxia Li,Renshan Wang,Xiankun Shao,Liangzhi Shao,Baoshan Zhang
In this work, a new design of ternary core–shell nanostructures of Au@ZnO–Pd was demonstrated to realize the synergetic utilization of a plasmonic effect and an electron-trapping co-catalyst for enhanced photocatalytic performance. In the ternary hybrid nanostructures, ZnO provides photo-generated carriers with higher redox ability, under UV-visible light, and Au nanocrystals perform the plasmonic hot electron injection as well as the local electromagnetic field enhancement of ZnO photoexcitation. Meanwhile, the Pd NPs can efficiently trap the generated electrons to govern the directional separation of the charge carriers. The efficient charge carrier separation in the ternary hybrid nanostructures was confirmed by steady-state PL spectra, time-resolved PL decay spectra, and transient photocurrent responses. The photocatalytic activity of the Au@ZnO–Pd nanostructures was evaluated by photodegrading phenol and methylene blue, respectively, under simulated sunlight (λ = 360–780 nm), and the results showed that the Au@ZnO–Pd nanostructures gained a great enhancement of photocatalysis compared with ZnO, ZnO–Pd and Au@ZnO. Moreover, the effect of Pd loading content in the Au@ZnO–Pd nanostructures on the photocatalytic efficiency was studied within a certain range, indicating that the Au@ZnO–Pd photocatalyst with ∼1.8 wt% Pd loading exhibited the best photocatalytic activities for photodegrading both phenol and methylene blue. The generation and effect of active species in the photocatalytic process were investigated using ESR testing and radical scavenging experiments. As a consequence, the integration of the ternary Au@ZnO–Pd core–shell nanostructures could achieve collective effects to greatly increase the photocatalytic efficiency.
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APPLIED BIOCHEMISTRY AND BIOTECHNOLOGY
·
2017
·Vol. 184
·期 3
·1009-1023
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IF 1.751
Jin Xinyu,Li Saisai,Long Nengbing,Zhang Ruifeng
A novel ZnO nanowire/macroporous SiO 2 composite was used as a support to immobilize chloroperoxidase (CPO) by in situ cross-linking method. An anionic bi-epoxy compound was synthesized and used as a long-chained anionic cross-linker, and it was adsorbed on the surface of ZnO nanowires through static interaction before reaction with CPO, creating a new approach to change the structure, property, and catalytic performance of the produced cross-linking enzyme aggregates (CLEAs) of CPO. The immobilized CPO showed high activity in the decolorization of three azo dyes. The effect of various conditions such as the loading amount of CPO, solution pH, temperature, and dye concentration was optimized on the decolorization. Under optimized conditions, the decolorization percentage of Acid Blue 113, Direct Black 38, and Acid Black 10 BX reached as high as 95.4, 92.3, and 89.1%, respectively. The immobilized CPO exhibited much better thermostability and resistance to pH inactivation than free CPO. The storage stability and reusability were greatly improved through the immobilization. It was found from the decolorization of Acid Blue 113 that 83.6% of initial activity retained after incubation at 4 °C for 60 days and that 80.9% of decolorization efficiency retained after 12 cycles of reuses.
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PubMed
高影响因子
Journal of Inorganic and Organometallic Polymers and Materials
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2017
·Vol. 28
·期 3
·1299-1304
·
IF 1.577
Xiao He,Zhang Weibo,Wei Yicui,Yu Lubin,Chen Lihui
In this study, Fe/ZnO composite nanosheets were successfully prepared by hydrothermal method using nanofibrillated cellulose (NFC) as a soft template. The crystalline and morphology structure of the samples were characterized by X-ray diffraction (XRD), BET analysis, Scanning electron microscopy (SEM) and Transmission electron microscope (TEM). Fe doping not only fabricated ZnO from square to strip shape, but also brought larger surface area and pore volume, resulting 59.7% removal of tetracycline by adsorption action. UV–Vis absorption test, X-ray photoelectron spectroscopy (XPS) and Energy dispersive spectrometer (EDS) have shown that iron had successfully embedded into the ZnO nanosheets resulting in red-shift of absorption wavelength. Fe/ZnO nanocomposites had about 90% photodegradation for tetracycline after two hours’ UV-irradiation.
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JOURNAL OF MATERIALS RESEARCH
·
2017
·Vol. 32
·期 2
·334-342
·
IF 1.673
Deyu Qu,Jianfeng Wen,Dong Zheng,Joshua Harris,Dan Liu,Lu Wang,Zhizhong Xie,Haolin Tang,Liang Xiao,Deyang Qu
A new lithium ion hybrid supercapacitor is reported, in which the negative electrode was made from ZnO nano-crystals coated with a nitrogen doped carbon, and a positive electrode composed of activated carbon. The ZnO nano-crystals were highly dispersed in a nitrogen doped carbon matrix through a bio-inspired route. Dopamine, used as the nitrogen and carbon source, self-polymerized and deposited onto the surface of ZnO nano-crystal. After pyrolysis, a nitrogen doped amorphous carbon coated ZnO nano-crystal materials were obtained. The characteristics of the synthesized carbon coated ZnO nano-crystal electrode as well as the electrochemical performance of the hybrid device were investigated. The ZnO nano-crystal structure was preserved in the course of the carbon coating. The lithium ion supercapacitor demonstrated a high capacity and good cycling stability. Such good performance can be attributed to improved conductivity, the prevention of ZnO nano particles from pulverization and the high degree of crystallinity of the ZnO material.
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AQUATIC TOXICOLOGY
·
2016
·
IF 3.557
Cai Zhang,Jiangtao Wang,Liju Tan,Xiaohua Chen
To explore toxic mechanisms of nano-ZnO on marine microalgae, algal growth inhibition test was carried out, and total Zn in the cell and total dissolved Zn in f/2 medium were determined. It was found that nano-ZnO was more toxic than bulk-ZnO on marine microalgae Skeletonema costatum . No matter under nano-ZnO or bulk-ZnO treatment, accumulation of intracellular Zn had a good linear correlation with growth inhibition ratio (IR). The total Zn content in the cell of microalgae was the dominant toxic mechanism of ZnO. Intracellular total Zn could be an indispensable parameter to indicate the toxic effects of nano-ZnO. Higher intracellular total Zn under nano-ZnO treatment than bulk-ZnO resulted in more toxicity of nano-ZnO on microalgae. Compared with Zn 2+ released by nano-ZnO into medium, lipid peroxidation (MDA level) injury, aggregation of nano-ZnO and transmembrane process of nano-ZnO also contributed to toxicity of nano-ZnO on Skeletonema costatum . The accumulation of intracellular Zn provides a new insight into toxic mechanisms of nano-ZnO.
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PubMed
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ENVIRONMENTAL POLLUTION
·
2016
·
IF 4.839
Lin Yang,Huijuan Kuang,Yingxia Liu,Hengyi Xu,Zoraida P. Aguilar,Yonghua Xiong,Hua Wei
Ultra-fine-ZnO showed low toxicity in complex water matrix containing multiple components such as PBS buffer and the toxic mechanism of ultra-fine-ZnO has not been clearly elucidated. In present study, enhanced antibacterial activity of 200 nm diameter ultra-fine-ZnO in PBS buffer against Bacillus cereus and Escherichia coli were observed in the presence of several organic acids in comparison with ultra-fine-ZnO in PBS buffer alone. These findings indicated that the toxic effects of the ultra-fine-ZnO was dependent on the concentration of released Zn 2+ which was affected by organic acids. The production of reactive oxygen species (ROS) did not responsible to the toxic mechanism of ultra-fine-ZnO which was tested using the antioxidant N -Acetylcysteine (NAC). Indeed, ultra-fine-ZnO induced bacteria cell membrane leakages and cell morphology damages that eventually led to cell death, which were confirmed using propidium monoazide (PMA) in combination with PCR and scanning electron microscopy (SEM). All data gathered herein suggested that released Zn 2+ played a major role in the microbial toxicity of ultra-fine-ZnO.
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International Journal of Applied Ceramic Technology
·
2025
·
IF 2.3
Jianfeng Wu,Jiaqi Yu,Xiaohong Xu,Yaqiang Shen,Deng Zhang,Lingyun Hu
In solar thermal power generation (STPG) systems, materials with high absorptivity and low emissivity are essential for efficient solar radiation capture and minimal thermal energy loss. This study explores the impact of ZnO on the optical properties of corundum-spinel composite ceramics. A material with high absorptance (92.60%) and low emittance (80.72%) was developed, showing excellent thermal shock resistance. The ZnAl 2 O 4 formed from ZnO and Al 2 O 3 enhances light absorption through electron transitions. Additionally, ZnAl 2 O 4 suppresses grain growth, reducing grain size and increasing phase boundaries, promoting light scattering and extending photon transport paths. These structural changes, along with defect sites, further boost absorptivity. ZnAl 2 O 4 also reduces mid-infrared emissivity, lowering overall infrared radiation. The material's combination of high absorptivity, low emissivity, and thermal stability makes it a strong candidate for STPG applications.
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FUEL
·
2024
·
IF 6.7
Ali Junaid,Faiqa Noreen,Abdus Sami,Karam Jabbour,Khadija Bibi,Muhammad Ammar Hassan Shah,Nigarish Bano,Muhammad Shuaib Khan,Asma A. Alothman,Syed Imran Abbas Shah
Pursuit of green hydrogen production is paramount, given escalating energy demands, resulting in quest for electrodes capable of water electrolysis, yielding green H 2 devoid of carbon dioxide, has posed a formidable challenge. Anodes and cathodes crafted from transition metal oxides (TMOs) reign supreme in water splitting due to their robust supporting capacity, potent redox capabilities, facile alteration of valence states, and superior electrical conductivity. In this study, a cutting-edge transition metal oxide nano-composite catalyst, comprised of Ag 3 VO 4 @ZnO, is synthesized via a facile hydrothermal method. Ag 3 VO 4 @ZnO catalyst showcases remarkable electrocatalytic prowess in both hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) when deployed in a 1.0 M potassium hydroxide (KOH) electrolyte, having active surface area of 140 cm 2 . Operating at a current density of 10 mA cm −2 , Ag 3 VO 4 @ZnO exhibits diminished overpotentials of 142 mV and 248 mV for HER and OER, respectively. Furthermore, it demonstrates lower Tafel slopes of 92 mV dec −1 and 46 mV dec −1 , alongside reduced charge-transfer resistances of 153 Ω.cm 2 and 2.60 Ω.cm 2 for HER and OER, respectively. Ag 3 VO 4 @ZnO showcases largest active surface area, minimal Tafel slope, and lower charge transfer resistance. Practical two electrode configuration exhibited exceptional 50-hour stability, along with Tafel slope values of 73 and 98 mV dec −1 for OER and HER, respectively. The reliable performance of electrode material in practical device configuration, makes it a practically viable alternative for current state-of-the-art catalysts.
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Journal of Water Process Engineering
·
2024
·
IF 6.3
Yulin Yuan,Qiongfang Wang,Xin Zhang,Lei Dong,Cheng Peng,Min Zhang,Pinhua Rao,Naiyun Gao,Jing Deng
The residues of sulfonamide antibiotics in the environment would pose a threat to aquatic ecosystem and human health. In this study, β-FeOOH@ZnO was synthesized by using a hydrothermal method to activate peroxymonosulfate (PMS) for the degradation of the typical sulfonamide antibiotic sulfadimethoxine (SDM), in which 98.89 % of SDM was removed in 60 min with activating 0.5 mM PMS. Moreover, the influence of catalyst dosage, PMS dosage, solution pH and anions on the degradation efficiency of SDM was investigated in the system. The results indicated that the material exhibited good applicability and β-FeOOH@ZnO performed well in a wide pH range (5–11). 1 O 2 was the major reactive oxygen species (ROS) rather than ˙ OH , S O 4 ˙ − and O 2 ˙ − through free radical quenching experiments and electron paramagnetic resonance experiments (EPR). Furthermore, the mechanism was found that ZnO could enhance the electron transfer pathway of β-FeOOH, which accelerated the degradation of SDM. Possible intermediate products and degradation pathways were proposed through LC-MS analysis. In summary, this study offered a new strategy for the efficient degradation of sulfonamide antibiotics in water treatment.
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JOURNAL OF VINYL & ADDITIVE TECHNOLOGY
·
2017
·Vol. 25
·期 1
·68-75
·
IF 1.558
Bin Zhang,Jian Han
Zhang, B. and Han, J. (2019), Enhanced protective properties and UV stability of poly(lactic acid)/poly(vinyl acetate)/ZnO microcapsule nanocomposite. J Vinyl Addit Technol, 25: 68-75. doi: 10.1002/vnl.21604 . The above article from the Journal of Vinyl & Additive Technology, published online on 15 September 2017 in Wiley Online Library ( wileyonlinelibrary.com ), has been retracted by agreement by the authors, the Journal Editor-in-Chief Alan Lesser, and Wiley Periodicals, Inc. The retraction has been agreed upon following the explanation by corresponding author Bin Zhang that this article contained irreproducible results. After efforts to replicate and adjust the enlarge test, the authors found misleading scientific content in Figures 2b, 4, 6, 8, 9b, and 11c-d based on incorrect comparisons to prior work in the journal Fibers & Polymers as follows: Zhang B, Han J. Preparation and UV-protective property of PVAc/ZnO and PVAc/TiO2microcapsules/poly(lactic acid) nanocomposites. Fibers and Polymers, 2016, 17(11):1849-1857. DOI 10.1007/s12221-016-6,679-1 .
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