ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
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2022
·Vol. 30
·期 7
·19450-19465
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IF 5.19
Chen Haodong,Shu Qing
In this study, a series of ternary composite photocatalysts ZnO/g-C 3 N 4 /AgCl( x ) ( x is the amount of AgCl added, x =0.05, 0.1, 0.15 g) were synthesized, and various characterization methods were used to analyze the morphology, structural, and photochemical properties of the above samples. The photocatalytic activity of the obtained samples was evaluated by degrading rhodamine B (RhB) and acid orange (AOII) under xenon lamp irradiation. The results show that the degradation rate of ZnO/g-C 3 N 4 /AgCl (0.1 g) is 99% within 60 min, which is much higher than the 38% degradation rate of g-C 3 N 4 . After five cycles, the degradation efficiency of RhB and AOII by ZnO/g-C 3 N 4 /AgCl (0.1 g) were still 85% and 94%, respectively. In addition to colored dyes, the photocatalytic degradation of colorless tetracycline hydrochloride (TCH) compounds was also investigated to understand the effect of photosensitization on the degradation process. Based on the electronic structure analysis of the DFT calculations, a staggered heterojunction structure was found between g-C 3 N 4 , ZnO, and AgCl. The enhanced photocatalytic activity of the ternary composite is mainly attributed to the efficient separation of charge carriers through the synergistic removal of photogenerated electrons in g-C 3 N 4 by ZnO and AgCl. Radical trapping experiments confirmed that •O 2 − and h + were the main active species in the reaction system. As a visible light-responsive catalyst, ZnO/g-C 3 N 4 /AgCl can be effectively applied to the degradation of organic dye pollutants and has broad application prospects.
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LWT-FOOD SCIENCE AND TECHNOLOGY
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2022
·
IF 6.056
Dong-Dong Zhang,Si Hu,Qiong Wu,Jin-Feng Zhao,Ke-Rui Su,Li-Qin Tan,Xian-Qing Zhou
Zea mays (Maize) is prone to mildew due to its rich nutrition and large embryo, resulting in the decline of edible quality, germination rate and even threatening people's health. In this study, ZnO nanoparticles were prepared by hydrothermal method to inhibit the growth of microorganisms on the surface of Zea mays . For its safe and efficient application, mesoporous silica (mSiO 2 ) was modified on its surface and successfully prepared ZnO@mSiO 2 Nanocomposites. The ZnO@mSiO 2 nanocomposites were successfully prepared and characterized by TEM, EDS, XRD, FT-IR, and it could significantly inhibit two model bacteria and three model fungi. After mixing with Zea mays and 42 days of simulated storage, they could significantly inhibit the growth of microorganisms in Zea mays , ensure the stability of Zea mays quality and improve the germination rate of Zea mays . The ZnO@mSiO 2 nanocomposites prepared in this study provide a new idea for the safe storage of Zea mays .
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CHINESE JOURNAL OF CHEMICAL ENGINEERING
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2022
·
IF 3.898
Zhengchi Yin,Xiaoke Wu,Yanwei Yang,Huayu Zhang,Wangtao Li,Ruimin Zhu,Qiancheng Zheng,Zhengbao Wang
Compared to inorganic supports, polymeric supports can offer additional benefits, e.g. , easier processing and cheaper. However, the organic surface has weak adhesion to the zeolitic imidazolate frameworks (ZIFs) membrane layer, which usually requires complex surface modification or seeding. Herein, we demonstrate that a dual-layer asymmetric polymer support prepared by a simple spinning process is a good candidate for the preparation of ZIF-8 membrane. The inner layer of the support is an organic hollow fiber (PES) with finger-like pores, and the outer layer is a ZnO-PES composite layer with finger-like pores also. The ZnO-PES composite layer is expected to contain uniform ZnO crystals in the polymer matrix, i.e ., the ZnO particles in the skin layer of the support are not easy to fall off. Under the induction of ZnO particles in the outer layers, continuous ZIF-8 membranes can be prepared by single in-situ crystallization, showing good adhesion to the supports. The obtained ZIF-8 membranes show a H 2 permeance of 8.7 × 10 −8 mol·m −2 ·s −1 ·Pa −1 with a H 2 /N 2 ideal separation selectivity of 18.0. The design and preparation of this dual-layer polymer support is expected to promote the large-scale application of MOF membranes on polymer supports.
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SENSORS AND ACTUATORS B-CHEMICAL
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2022
·
IF 9.221
Lili Sun,Yun Guo,Yanchao Liu,Ronghua Ni,Gang Chen,Xiaoshun Wei,Zebin An,Zheng Jiao
Modification of traditional metal oxides to prepare gas sensors with excellent response and high selectivity for monitoring air pollution, is a pivotal indicator for the development of gas sensing technologies. In this research, the core-shell Tourmaline@ZnO/MWCNT micro-nanostructured composite was successfully constructed and prepared by the uniform co-precipitation and hydrothermal methods , which effectively achieved the high sensitivity to n-butanol. The structure, morphology and surface electron valence state were characterized by employing important analytical techniques. With tourmaline as the inner-core and MWCNT-interspersed ZnO nanosheets as the outer-shell, the uniquely hierarchical micro-nanostructure covered a larger specific surface area, which provided more active sites during the reaction. Meanwhile, the performance assessments demonstrated that the proposed micro-nano structure exhibited exceptional gas-sensing properties, while Tourmaline@ZnO/ 0.9%MWCNT sensor reaching the highest response value to 185.8–100 ppm n-butanol far exceeding other detected gases, additionally with a faster response-recovery time. The presence of tourmaline and the interspersion of MWCNT played a synergistic effect on the enhancement of the properties for ZnO-based gas sensors, which brought about a beneficial impact on the carrier transport. This technical strategy should be of certain significance in the intelligent preparation and extensive application of high-performance sensing devices in the future.
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JACS Au
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2022
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IF 0
Yuhai Sun,Junliang Wu,Yaolin Wang,Jingjing Li,Ni Wang,Jonathan Harding,Shengpeng Mo,Limin Chen,Peirong Chen,Mingli Fu,Daiqi Ye,Jun Huang,Xin Tu
Plasma-catalytic CO2 hydrogenation is a complex chemical process combining plasma-assisted gas-phase and surface reactions. Herein, we investigated CO2 hydrogenation over Pd/ZnO and ZnO in a tubular dielectric barrier discharge (DBD) reactor at ambient pressure. Compared to the CO2 hydrogenation using Plasma Only or Plasma + ZnO, placing Pd/ZnO in the DBD almost doubled the conversion of CO2 (36.7%) and CO yield (35.5%). The reaction pathways in the plasma-enhanced catalytic hydrogenation of CO2 were investigated by in situ Fourier transform infrared (FTIR) spectroscopy using a novel integrated in situ DBD/FTIR gas cell reactor, combined with online mass spectrometry (MS) analysis, kinetic analysis, and emission spectroscopic measurements. In plasma CO2 hydrogenation over Pd/ZnO, the hydrogenation of adsorbed surface CO2 on Pd/ZnO is the dominant reaction route for the enhanced CO2 conversion, which can be ascribed to the generation of a ZnOx overlay as a result of the strong metal–support interactions (SMSI) at the Pd–ZnO interface and the presence of abundant H species at the surface of Pd/ZnO; however, this important surface reaction can be limited in the Plasma + ZnO system due to a lack of active H species present on the ZnO surface and the absence of the SMSI. Instead, CO2 splitting to CO, both in the plasma gas phase and on the surface of ZnO, is believed to make an important contribution to the conversion of CO2 in the Plasma + ZnO system.
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ELECTROANALYSIS
·
2022
·Vol. 35
·期 1
·e202100703
·
IF 3.077
Xueying Li,Xiaokun Li,Suxiang Feng
In this study, tetracarboxylic manganese phthalocyanine coated nano-zinc oxide (MnC 4 Pc-ZnO) composite material was prepared by in-situ growth method and modified with indium tin oxide (ITO) glass electrode to construct a photoelectrochemical (PEC) sensor. A PEC sensor for the determination of amlodipine besylate (AB) was developed for the first time based on the principle of precipitation reaction between heavy metal ions and dihydropyridine and the recombination suppression effect of the material. The morphology and optical properties of the MnC 4 Pc-ZnO composites were characterized by scanning electron microscopy (SEM) and ultraviolet-visible diffuse reflectance spectroscopy (UV-vis DRS). Chronoamperometry (i-t) and electrochemical impedance spectroscopy (EIS) were used to study the PEC behavior of ITO electrodes modified by MnC 4 Pc-ZnO composite material. The study found that the MnC 4 Pc-ZnO composite material has a good photocurrent response to AB, and there was a good linear relationship between the concentration range of 75 nM-250 μM, the linear equation was I (μA)=−5.2×10 −8 ×lg C +3.2×10 −8 (r=0.9947), a limit of detection (LOD) of 20 nM. In addition, MnC 4 Pc-ZnO/ITO also has good selectivity and stability. The PEC sensor detects amlodipine besylate tablets, amlodipine besylate dispersible tablets, and biological samples, with standard addition recovery rates of 96.11 % and 103.96 %, respectively. The determination result has good accuracy, and the PEC sensor provides a new method for detecting AB.
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Journal of Asian Ceramic Societies
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2022
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IF 2.546
Hai Jiang,Ning Ding,Zheng-Yu Zou,Xiao-Hong Wang
The effect of ZnO on phase composition, microstructure, thermal and dielectric properties of AlN ceramics was studied. The X-ray diffraction indicated that ZnAl2O4 and ZnO phases were detected in samples. With 0.5 wt% ZnO added, the thermal conductivity of AlN sample increased to 193.7 W/m·K. Whereas, the thermal conductivity dropped sharply due to excess ZnO. Moreover, the addition of ZnO increased the permittivity and altered the relaxation mechanism of AlN ceramics. The fitting data and activation energy from impedance spectroscopy revealed the variation of defect mechanisms in samples. The addition of 0.5 wt% ZnO reduced the concentration of aluminum vacancy in AlN grains to improve thermal conductivity. Nevertheless, excess ZnO dissolved into the AlN lattice and created additional defects, causing the decrease in thermal conductivity and electrical resistivity for AlN ceramics. Overall, suitable addition of ZnO can effectively increase the thermal conductivity and alter the dielectric properties of AlN ceramics.
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JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
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2022
·
IF 10.319
Qin Wang,Yao Tong,Meiting Yang,Hangtao Ye,Xiaojuan Liang,Xin Wang,Weidong Xiang
In the current situation of energy shortages, saving energy and reducing consumption are undoubtedly valid methods to relieve the pressure on resources. CsPb X 3 ( X = Cl, Br, and I) perovskites as star inorganic materials have drawn growing attention owing to their unique properties, making them suitable for applications such as light-emitting diodes (LEDs), solar cells, photodetectors, or lasers. This work presents zinc oxide (ZnO) induced self-crystallized CsPb(Br/I) 3 perovskite with a 26% photoluminescence quantum yield (PLQY) prepared by the traditional melt-quenching method. Furthermore, the full width at half maximum (FWHM) (34–44 nm) can be regulated by the ZnO content. In addition, as a downconverter, CsPb(Br/I) 3 perovskite nanocrystals (NCs) realize a bright red backlight that covers ≈ 94% Rec. 2020 standards in the CIE 1931 color space and 126% of National Television System Committee (NTSC). This finding undoubtedly confirms an effective path for fabricating perovskite materials in a green, low-cost, and time-saving way, enriching the knowledge of glass crystallization mechanisms and promoting their applications in wide color gamut backlights.
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Journal of Magnesium and Alloys
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2022
·
IF 11.813
Shiquan Jiang,Weidong Li,Jinyu Liu,Jiqiong Jiang,Zhe Zhang,Wei Shang,Ning Peng,Yuqing Wen
A longstanding quest in material science has been the development of superhydrophobic coating based on a single material, without the requirement of fluorination or silane treatment. In this work, the micro-arc oxidation (MAO) coating as transition layer can effectively enhance the bonding force of the superhydrophobic coating. The semiconductor@metal organic frameworks (MOFs) core-shell structure was synthesized by a simple self-templating method, and obtained ZnO@2-methylimidazole zinc salt (ZIF-8) nanorods array on magnesium (Mg) alloy. ZnO nanorods not only act as the template but also provide Zn 2+ for ZIF-8. In addition, we proved that the ligand concentration, synthesis time and temperature are the keys to the preparation of ZnO@ZIF-8 nanorods. As we expect, the ZnO@ZIF-8 nanorods array can trap air in the gaps to form an air layer, and the coating exhibits superhydrophobic properties (154.81°). Excitingly, ZnO@ZIF-8 nanorods array shown a superhydrophobic property, without the requirement of fluorination or silane treatment. The results shown that the coating has good chemical stability and self-cleaning performance. Meanwhile, the corrosion resistance has been significantly improved, R ct was increased from 1.044×10 3 to 1.414×10 6 Ω/cm 2 and I corr was reduced from 4.275×10 −5 to 5.611×10 −9 A/cm 2 . Therefore, the semiconductor@MOFs core-shell structure has broad application prospects in anti-corrosion.
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ACS Applied Energy Materials
·
2022
·
IF 6.959
Tuo Xin,Yiran Wang,Qiuju Xu,Jiaxiang Shang,Xiangcheng Yuan,Weixing Song,Jinzhang Liu
Rechargeable aqueous zinc-ion batteries (ZIBs) hold great promise for future applications in large-scale energy storage systems. However, the rampant dendrite growth and undesired hydrogen gas evolution over the Zn anode are key issues that make the current ZIB technology immature. Herein, we demonstrate the use of a zeolitic imidazolate framework (ZIF)-derived composite coating on Zn foil for simultaneously suppressing the dendrite growth and H2 evolution when operated in ZnSO4 electrolytes. The polyhedral ZIF-8 granules are converted into mesoporous N-doped carbon (NC) decorated with ZnS nanoparticles, and this ZnS/NC composite is coated onto Zn foil. For comparison, bare Zn anodes and Zn foils coated with other ZIF-derived materials including ZnS nanocrystals and NC frameworks are also used to make half or full cells. The Zn@ZnS/NC anode shows the best performance in terms of superb cycling stability, suppressed dendrite growth, and reduced H2 evolution. At the interface between ZnS/NC coating and Zn foil, confined parasitic reactions result in a layer of an amorphous ZnO nanosheet network, which has a positive effect on reducing water activity. The role of this amorphous ZnO byproduct in reducing H2 evolution is discussed in detail. This work sheds light on a strategy for making practical ZIBs.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2022
·
IF 24.319
Yongxing Zhang,Jia Hu,Yong Xu,Xiangyu Yan,Siqi Zhang,Kang Duan,Cheng Chen,Ye Yuan,Francis Verpoort
An unexpected CO 2 -induced dissolution of ZnO into ionic liquids was discovered. This process exhibited high dissolution speed and the dissociated mixture was applied as an efficient Zn-based catalytic system for the CO 2 -promoted hydration of propargylic alcohols under atmospheric pressure with broad substrate scope. Moreover, this system could be recycled and reused for at least 16 times with excellent yields continuously obtained, which is an unprecedented record for this reaction. Significantly, this system could employ waste pigments as the ZnO source and work even under flue gas atmosphere. In the mechanistic investigations, the interaction between ZnO, CO 2 and ionic liquids to give N-heterocyclic carbene/CO 2 adducts proved to be the key factor for this specific dissolution. These adducts were further identified to exhibit better reactivity than the normal CO 2 by experimental data and density functional theory (DFT) calculations, which might be responsible for the excellent performance of the abovementioned catalytic system.
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CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Hui Zhang,Shisong Guo,Wenjun Zheng,Haichao Wang,Hua-Yao Li,Mei-Hui Yu,Ze Chang,Xian-He Bu,Huan Liu
Aiming to achieve high-sensitivity disease diagnosis, it is of great significance to continuously improve the sensing performance of metal oxide based sensors. The morphology and component of metal oxides can be rationally engineered by using metal–organic frameworks as highly versatile platforms. Herein, the bimetallic Sn/Zn-ZIF-8 is synthesized by self-assembly, and then SnO 2 -ZnO hollow nanoparticles are obtained by using bimetallic Sn/Zn-ZIF-8 as precursor. The obtained SnO 2 -ZnO composite maintained the dodecahedral structure of Sn/Zn-ZIF-8, and in which SnO 2 is orthogonal due to the framework-induced effect. Based on the unique structure and composition of SnO 2 -ZnO, 6% SnO 2 -ZnO exhibits excellent selectivity, high response, low detection limit (0.82 ppb) and good response linearity between response and concentration of acetone, showing the potential of the practical application in clinical diagnosis of diabetic patients. In-depth discussions reveal that the excellent sensing performance can be attributed to the n-n heterostructure of SnO 2 -ZnO that is favorable for electron transport, the larger adsorption energy to acetone that results from orthogonal SnO 2 , and the abundant active reaction sites provided by the dodecahedral mesoporous structure. This synthetic strategy may provide an effective method for the facile engineering of high-performances metal oxide-based sensors toward practical health assessment.
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