APPLIED BIOCHEMISTRY AND BIOTECHNOLOGY
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2019
·Vol. 190
·期 2
·475-486
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IF 2.14
Liu Yuting,Zong Shuai,Li Jinglei
ZnO and ZnO nanoparticles (ZnO NPs) are widely used in food packaging, food preservation, cosmetic preparation, and animal feed. ZnO is alleged showing multiple bioactivities including antimicrobial and anti-inflammation. It is hypothesized in this study that bulk ZnO and ZnO NPs could attenuate symptoms associated with high-fat-diet–induced obesity. Bulk ZnO and ZnO NPs with diameters of 30 and 90 nm were administered to high-fat-diet (HFD)–induced obese mice. Body weight, liver and fat tissue indices of ZnO-treated mice were decreased compared with those of obese mice (MOD). Blood glucose levels in oral glucose tolerant test and insulin tolerant test of ZnO-treated mice were lower than those of MOD. Serum lipid profile of ZnO-treated mice was ameliorated with lower total cholesterol, total triglyceride, and low-density lipoprotein cholesterol levels compared with that of MOD. In addition, the levels of serum IL-1β and LPS-binding protein were also decreased by ZnO treatment. Both bulk and nanosized ZnO could attenuate HFD-induced phenotypes related with obesity, but ZnO NP is more efficient to lower the fat index and bulk ZnO is better to restore the disturbed serum lipid profile.
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CHEMICAL ENGINEERING JOURNAL
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2019
·
IF 8.355
Xingsheng He,Da-Peng Yang,Xiaoyan Zhang,Minghuan Liu,Zewen Kang,Chenfei Lin,Nengqin Jia,Rafael Luque
In the present work, we synthesized CuO-ZnO (CZ) nanocomposites using a bio-templated method from biowaste-eggshell membranes (ESM). Results showed that CZ-ESM nanocomposites of morphology and structure preserved the original structural characteristics of ESM with interlaced network coated by small inorganic nanoparticles. In addition, the samples exhibit excellent adsorption, catalysis and antibacterial activities. Experimental results showed the adsorption kinetics and isotherm were well described by pseudo-second order kinetics and Langmuir isotherm model for Congo red dye, the maximum adsorption capacity was determined to be 775 mg•g −1 . The catalysis reduction efficiency of CZ-ESM nanocomposites for 4-nitrophenol (4-NP) reached 98% after 12 min at room temperature. CZ-ESM could be recycled several times without any significant activity loss. Furthermore, the results of antibacterial experiments indicated that CZ-ESM nanocomposites exhibited a strong inhibition activity against E. coli and S. aureus . The maximum diameter of the inhibition zone was 27.5 mm for S. aureus and 20.3 mm for E. coli .
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RSC Advances
·
2019
·Vol. 9
·期 32
·18406-18414
·
IF 3.049
Haichuan Ma,Fan Zhang,Qiaoyu Li,Guobing Chen,Sheng Hu,Haiming Cheng
In this study, nano-ZnO loaded amidoxime-functionalized wool fibers (wool-AO@ZnO) were synthesized by radiation-induced copolymerization and in situ co-precipitation as a novel adsorbent with good antibiofouling properties for uranium recovery. The prepared adsorbent was characterized by SEM-EDS and FT-IR spectroscopy. Batch adsorption experiments showed that the prepared wool-AO@ZnO have a good uranium adsorption property at pH 6.0–9.0. Meanwhile, wool-AO@ZnO displayed a good inhibition of aerobic bacteria such as S. aureus and E. coli; of anaerobic bacteria; of sulfate reducing bacteria; of fungus C. albicans and of mildew Aspergillus niger. After four cyclic cultivations with microorganisms, the inhibition rate of wool-AO@ZnO to E. coli and S. aureus still remains at 77.8% and 84.9%, respectively; and a good adsorption capacity for uranium(VI) was maintained. The prepared wool-AO@ZnO could be a promising antibiofouling adsorbent for the recovery of uranium(VI) from seawater.
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CHEMISTRY-A EUROPEAN JOURNAL
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2019
·Vol. 25
·期 41
·9710-9720
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IF 5.16
Dawei Zhao,Tengteng Wu,Yi Zhou
Graphical Photofit : Fabricating a high-performance photocatalyst to efficiently solve serious environmental problems is an urgent affair. A series of MoS 2 /ZnO composites were successfully fabricated through a facile hydrothermal route, leading to a highly efficient MoS 2 /ZnS/ZnO ternary photocatalyst for environmental treatment. Fabricating a high-performance photocatalyst to efficiently solve serious environmental problems is an urgent affair. Herein, a series of MoS 2 /ZnO composites were successfully fabricated through a facile hydrothermal route using Na 2 MoO 4 , (NH 2 ) 2 CS and urchin-like ZnO as precursors. According to the results of XRD and XPS, it was found that ZnS appeared in MoS 2 /ZnO composite; meanwhile, the content was positively correlated with the weight of the precursor (NH 2 ) 2 CS. It should be noted that the morphology and the metallic phase content of MoS 2 grown in situ on the surface of ZnO were affected by the molar ratio of Na 2 MoO 4 and ZnO. Benefiting from the special dual II heterojunctions of MoS 2 /ZnS/ZnO ternary composite, the material exhibited excellent charge separation and transfer performances. In the photocatalytic measurements, the MoS 2 /ZnS/ZnO (Na 2 MoO 4 :ZnO 1:2 MZ2) composite not only exhibits excellent photocatalytic Cr VI reduction activity of 42.3×10 −3 min −1 , but also displays remarkable adsorption performance (nearly 32.1 %) for Cr 2 . In addition, the ternary composite shows dominant photocatalytic Cr VI reduction activities compared to other photocatalysts. This work provides a high-efficient MoS 2 /ZnS/ZnO ternary photocatalyst for environmental treatment.
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MATERIALS LETTERS
·
2019
·
IF 3.019
Shushu Chu,Hui Li,Yingzi Wang,Qian Ma,Hang Li,Qi Zhang,Ping Yang
Various NiO/ZnO heterostructures have been prepared by a facile solvothermal method combined with subsequent calcination process. By adjusting the adding proportion of Ni/Zn, the superior performance in photocatalytic degradation of tetracycline (TC) can be achieved in porous NiO/ZnO flower-like microstructures consisting of interlaced nanosheet/particle framework. Compared with NiO hollow microspheres, flower-like NiO/ZnO samples exhibit the enhanced photocatalytic performance with high efficiency of 92% within 30 min as well as good photocatalytic cycle stability to TC, which is mainly ascribed to the combination of larger specific surface area (162.1 m 2 /g), unique surface/interface effect, faster electron/hole separation, and higher electron transmission. This work paves the way for other oxide composites applied as novel photocatalysts based on the design and construction of interlaced nanosheet/particle heterostructures.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2019
·
IF 4.175
Tengchao Guo,Guoyue Xu,Shujuan Tan,Zhihong Yang,Honghan Bu,Gang Fang,Haili Hou,Jing Li,Lingyu Pan
Nowadays, the high temperature low infrared emissivity problem has been of increasing significance and attracting more attention owing to the widespread applications for high temperature conditions. One key solution for this problem is to study the mechanism of high temperature low infrared emissivity and then design the materials with low infrared emissivity at elevated temperature. This paper gives an introduction to the infrared emissivity of ZnO powders in 3∼5 μm waveband at elevated temperature with various well-defined morphologies, e.g. needle-, pencil-, flower-, and flat-like. Among these morphologies, flat-like ZnO powders exhibit the lowest infrared emissivity because they have the largest real part of the dielectric function. Additionally, the variation of electrons average scattering time and lattice vibration at various temperature determine the variation tendency of infrared emissivity with temperature.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2019
·Vol. 27
·期 2
·1888-1897
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IF 2.914
Wang Ying,Wang Luxing,Deng Xiaoyan,Gao Hongtao
Waste biomass can be recycled to prepare biochar for soil restoration, in which process soil fertility would not be lost. In this work, biochar was prepared from waste pomelo peel, combined with ZnO, to be used to immobilize Cu(II) in contaminated soil, whose maximum adsorption capacity was up to 216.37 mg g −1 . Due to combination of ZnO, the BET surface area of biochar increased from 2.39 to 18.53 m 2 g −1 . Meanwhile, the surface functional groups increased, which was conducive to fixation of metal ion on the surface of biochar. Both pseudo-second-order kinetics and Langmuir isotherm model fit the experimental data well. Adsorption was easy to happen since the adsorption site on the surface of biochar/ZnO had a strong affinity with Cu(II). In addition, mechanism investigation indicated that Cu(II) was bond with biochar/ZnO mainly by non-bioavailable state (75.6%) primarily. It inferred that biochar/ZnO was an efficient and promising passivator in reducing heavy metal risk in soil.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2019
·
IF 3.131
Shudi Zhang,Xiangli Zheng,Peng Wang,Dun Zhang
A super-hydrophobic surface (SHS) which facilitates the micro-droplet self-bounce was fabricated over copper substrate with hydrothermal synthesis method. It was characterized with FE-SEM, XRD , and so forth, and its corrosion protection performance was evaluated with electrochemical measurement. It was demonstrated that the needle-cone structure of super-hydrophobic surface facilitates the micro-droplets self-bounce behavior. Self-bounce effect of super-hydrophobic surface can help to reduce the contact area between the water droplet and the surface, thereby reducing the corrosion process of substrate under simulated condensation environment. This research provides a novel direction for the development of corrosion protection methods.
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PARTICLE & PARTICLE SYSTEMS CHARACTERIZATION
·
2019
·Vol. 36
·期 3
·1800403
·
IF 4.194
Yuanjie Xu,Chaochao Li,Huihan Huang,Lei Huang,Luming Peng,Haibo Pan
The selective degradation of specific substances in mixed contaminants is quite challenging. And a general approach for sensitized oxide semiconductor relies on dip-coating method with sensitizer. Here, hydrophilic 2D, nest-like architecture ZnO (ZnO NA) was hydrophobicly functioned by monomolecular–layer tetraphenylporphyrin zinc (ZnTPP), where ZnTPP was synthesized by means of an in situ center-substituted (ISCS) process., i.e., the hydrogen atoms in the core of metal-free tetraphenylporphyrin (H 2 TPP) are substituted by the unsaturated zinc ions in ZnO NAs. ZnTPP/ZnO NA was exhibited with significant hydrophobicity, benefitting to absorb hydrophobic phenol (PL). Further, it is realized to selectively photodegradate PL in the mixture by ZnTPP/ZnO NAs under visible irradiation. Note that the rate of degradation to hydrophobic PL by ZnTPP/ZnO NA is 9.17 times of that for ZnO NA within 150 min; on the contrary, the degradation rate of hydrophilic rhodamine B (RhB) by ZnTPP/ZnO is reduced by 40%. Radiative lifetime of photogenerated charges is obviously increased by ZnTPP/ZnO NA compared with that of ZnTPP, indicating the effective charge separation for ZnTPP/ZnO NAs. In addition, ZnTPP/ZnO NA produced more superoxide radicals (·O 2 − ) in comparison to ZnO NA. With surface functionalization, the feasibility of selective photocatalysis under visible irradiation is demonstrated.
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NANO
·
2019
·
IF 1.293
Yanwei Sui,Man Zhang,Haihua Hu,Yuanming Zhang,Jiqiu Qi,Fuxiang Wei,Qingkun Meng,Yezeng He,Yaojian Ren,Zhi Sun
The interconnected three-dimensional Ni–Co–S nanosheets were successfully deposited on ZnO nanorods by a one-step potentiostatic electrodeposition. The Ni–Co–S nanosheets provide a large electrode/electrolyte interfacial area which has adequate electroactive sites for redox reactions. Electrochemical characterization of the ZnO@Ni–Co–S core–shell nanorods presents high specifc capacitance (1302.5 F/g and 1085 F/g at a current density of 1 A/g and 20 A/g), excellent rate capabilities (83.3% retention at 20 A/g) and great cycling stability (65% retention after 5000 cycles at a current density of 30 A/g). The outstanding electrochemical performance of the as-prepared electrode material also can be ascribed to these reasons that the special structure improved electrical conductivity and allowed the fast diffusion of electrolyte ions.
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ELECTROCHIMICA ACTA
·
2019
·
IF 5.383
Zhuoyin Peng,Zhou Liu,Jianlin Chen,Yanjie Ren,Wei Li,Cong Li,Jian Chen
Single crystalline ZnO nano-array films are prepared by electrochemical deposition process , which are successfully introduced as an interlayer between FTO conductive glass substrate and TiO 2 nanoparticle films to fabricate the quantum dot sensitized solar cells. Different structure of ZnO nano-array films are modulated by the time of electrochemical deposition process, which have been mainly investigated the photovoltaic performance and charge transfer property of the solar cells. The enhancements of optical absorption properties and electron-hole separation properties on photo-electrodes have been observed by UV–Vis absorption and photoluminescence spectra. And electrochemical impedance spectra and photoluminescence decay analysis have indicated that the ZnO nano-array interlayer can effectively increase the rate of charge transfer in the quantum dot sensitized solar cells system. With the balance on the diameter, density and thickness of the ZnO nano-array interlayer, the photovoltaic conversion efficiency of FTO/ZnO/TiO 2 /CuInS 2 quantum dot sensitized solar cells have enhanced from 4.12% to 4.58% without any optimization of passivation , electrolyte and counter electrode.
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ACS Photonics
·
2018
·
IF 6.88
Fei Chen,Zhenyang Liu,Zhongyuan Guan,Zheming Liu,Xu Li,Zhenbo Deng,Feng Teng,Aiwei Tang
Colloidal ZnO nanoparticles (NPs) are widely used as an electron-transporting layer (ETL) in the solution-processed quantum-dot light-emitting diodes (QD-LEDs). However, the inherent drawbacks including surface defect sites and unbalanced charge injection prevent the device from realizing their further performance enhancement. In this work, a series of Mg doped ZnO (ZnO:Mg) and chloride-passivated ZnO (Cl@ZnO) NPs were synthesized by using a solution-precipitation strategy, and they exhibited tunable optical bandgaps and upward-shift of conduction-band maximum (CBM). Solution-processed QD-LEDs based on cadmium-free Cu-In-Zn-S/ZnS (CIZS/ZnS) nanocrystals (NCs) were fabricated by using ZnO:Mg and Cl@ZnO NPs as the ETLs, whose maximum peak external quantum efficiency (EQE) was nearly twice as high as that of QD-LEDs using ZnO NPs as the ETL (EQE = 1.54%). To take advantage of the benefits of ZnO:Mg and Cl@ZnO NPs, Cl@ZnO:Mg NPs were developed through the integration of Mg doping and Cl-passivation. Surprisingly, the cadmium-free QD-LEDs with the Cl@ZnO:Mg NPs as the ETL exhibited a maximum peak EQE of 3.72% and current efficiency of 11.08 cd A–1, which could be enhanced to be 4.05% and 12.17 cd A–1 by optimizing the Cl amount, respectively. The positive effects of the Mg doping and Cl-passivation on the cadmium-free QD-LEDs are primarily ascribed to the reduced electron injection barrier of ETL/the emitting layer interface and slower electron mobility, which can be verified by the ultraviolet photoelectron spectroscopy (UPS) measurements and current density–voltage characteristics of electron-only devices.
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