SENSORS AND ACTUATORS A-PHYSICAL
·
2024
·
IF 4.1
Yue Li,Chen Chen,Yu Sun,Qian Xia,Cuiping Gu,Jiarui Huang
Metal-oxide semiconductor is widely applied in gas sensor for volatile organic compound detection. However, these sensors usually exhibit poor selectivity and inferior sensitivity. Here, ZnO@Fe 2 O 3 microflowers were synthesized using FeOOH microflowers as precursors via a simple solution reaction route, followed by heat treatment. The ZnO@Fe 2 O 3 microflowers were characterized using a series of techniques, and their sensing responses to volatile organic compounds (VOCs) were evaluated in comparison with those of pristine Fe 2 O 3 . The ZnO@Fe 2 O 3 microflower sensor exhibited better responses to several gases, especially acetone, with a response of 74.3 towards 100 ppm acetone, which is 2.85 times higher than that of the Fe 2 O 3 microflower sensor. The sensor also presented high selectivity, reproducibility, and stability in sensing different VOCs. The large specific surface area , heterostructure , favorable hierarchical flower-like nanostructure assembled by the nanosheets , and high porosity of the ZnO@Fe 2 O 3 microflowers contributed to its enhanced gas-sensing responses. Overall, this synthetic strategy for fabricating flower-like ZnO@Fe 2 O 3 nanostructures can be widely applied.
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Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Dongxiao Liu,Zechen Yan,Jingyi Zhao,Daqian Zhuang,Yanrui Zhao,Xiaofang Li,Lei Zhu
Developing efficient hydrogel filtration membranes and eco-friendly sustainable water purification methods remain a global challenge. In this study, one convenient hydrogel filter system based on CNFs@MXene@ZnO (CMZ) has been constructed by the one-step injection approach. Herein, MXene nanosheets and ZnO nanoparticles are loaded onto a 3D interwoven CNFs skeleton, constructing a multifunctional superhydrophilic interface. The results demonstrate that the CMZ achieves exceptional separation efficiency (>98 %) and water flux (>1600 L·m⁻²·h⁻¹·bar −1 ) for oil/water emulsions, with notable suspended solids retention (>97.5 %) for oil/water/solid emulsions. The system versatility is further proven by the clean water production performance from complex natural environmental waters, including river water, sea water, and snowmelt. Notably, after the separation process, the CMZ system exhibits the significant photocatalytic properties to degrade the pollutants upon the membrane surface under ultraviolet light conditions. Moreover, when the CMZ reaches its service life, secondary contamination could be avoided by the biodegradation process of the fully bio-based CNFs, enabling the membrane to naturally degrade within 30 days. This study presents not only an eco-friendly and efficient water purification material for complex separation systems, but also a novel, convenient and outdoor water treatment device, advancing the technology for complex separation systems.
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Journal of the American Chemical Society
·
2025
·
IF 15.6
Yin Qin,Sihao Deng,Xiao-Ye Zhou,Zilin Yan,Lunhua He,Kaikai Li,Tong-Yi Zhang
The lattice oxygen evolution reaction (OER) is the currently predominant mechanism, while the grain boundary (GB) OER is still the enigma. This study proposes the grain boundary oxygen mechanism (GBOM) and validates it using Zn-RuO2@ZnO in OER. An optimal GB density in Zn-RuO2@ZnO achieves an overpotential of 170 mV and 600 h durability at 10 mA cm–2. As an anode catalyst in proton-exchange membrane water electrolyzers (PEMWEs), Zn-RuO2@ZnO exhibits exceptional stability (>300 h at 500 mA cm–2) and high efficiency, requiring only 1.68 V to deliver 1 A cm–2 under 60 °C. Notably, the reduced symmetry at GBs enhances the Ru 4dxy-O 2p hybridization, manifested as a distinct antiferromagnetic state, which activates the GBOM pathway and stabilizes its operation through electron transfer into lower-energy orbitals. Our findings highlight that GBs with antiferromagnetic characteristics offer an intriguing design strategy for developing highly active and stable OER catalysts.
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PubMed
高影响因子
Surfaces and Interfaces
·
2025
·
IF 6.3
Jiayuan Xu,Jijun Ding,Chengxi Wei,Haixia Chen
The preparation of stable and highly adhesive composite structures on the copper mesh is important to achieve long-term oil-water separation. In this work, ZnO nanorod arrays/polyvinylidene fluoride/octadecylamine (ZnO/PVDF/ODA) composite membranes are fabricated on copper mesh combining magnetron sputtering, hydrothermal and impregnation methods. The results show that ZnO nanorod arrays enables the surface coating to be firmly attached to the membrane surface, thus significantly improving the mechanical stability of the membrane. ZnO/PVDF/ODA composite membranes demonstrate excellent separation efficiency and flux during gravity-driven oil-water separation process. For all oil-water mixtures tested, the membrane separation efficiency is above 97 %. The best performance is obtained in the separation of dichloromethane and water, while the separation efficiency can reach 99.84 %, it also shows high separation flux (1686.022 Lm -2 h -1 ). Simultaneously, the composite membrane exhibits favorable physical and chemical stability for the purpose of long-term oil-water separation. It provides a feasible method of fabricating composite membranes for efficient oil-water separation based on copper mesh.
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CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Baoqing Han,Song Xue,Benben Wang,Yuefei Yan,Hairong Wang,Congsi Wang
As a characteristic marker of advanced fibrosis, isoprene could be utilized for quick screening of liver disease. In this study, ZnO samples modified with varying molar percentages of Pt, as well as unmodified ZnO, were synthesized using hydrothermal method. The results revealed that the specific surface area (SSA) of the 1 mol% Pt@ZnO was as high as 51.6 m 2 /g and the original porous structure of ZnO was retained. The sensing performance of fabricated Pt@ZnO and ZnO was systematically evaluated, revealing enhanced isoprene detection capability for the 1 mol% Pt@ZnO compared to its unmodified counterpart. At an isoprene concentration of 0.2 ppm, the response time of Pt@ZnO was only 8 s, and the optimal temperature was lowered to 230 °C, facilitating rapid detection of isoprene with low power consumption. In addition, when exposed to 1 ppm isoprene, the 1 mol% Pt@ZnO exhibited a response value of 30.1, representing a threefold over pristine ZnO. Remarkably, the 1 mol% Pt@ZnO demonstrated remarkable sensitivity with a response value of 4.1 at 20 ppb isoprene concentration, while exhibiting superior selectivity towards isoprene compared to ZnO. In conclusion, 1 mol% Pt@ZnO spherical flower-like nanomaterial showed promise as candidate for isoprene gas-sensing applications.
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ChemistrySelect
·
2025
·Vol. 10
·期 33
·e03600
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IF 2
Jiaqin Wang,Fang Li,Yasi Wang,Wei Huang
Graphical The Al-doped ZnO catalyst has a lower work function, which is conducive to promoting the dissociation of CH x O* to form CH x *; it also facilitates the generation of Zn x+ and oxygen vacancies, which further promotes the generation of C 2+ OH. The direct conversion of syngas into C 2+ OH has attracted significant attention as a potential pathway for energy conversion. However, this process typically requires the use of precious metals or the collaborative action of multi-component catalysts, making it relatively complex. In this paper, simple and economical Al-doped ZnO catalysts were employed for the synthesis of C 2+ OH. The results show that the work function, Zn x+, and the relative content of oxygen vacancies are linearly related to C 2+ OH/ROH. When the doping amount was 7 mol%, the catalyst had the highest C 2+ OH/ROH (82.6 wt%), corresponding to the lowest work function value, the highest Zn x+ content, and the relative content of oxygen vacancies. We reveal that the successful synthesis of C 2+ OH depends not only on the low work function of the Al-doped ZnO but also on the existence of the oxygen vacancies and Zn x+ sites. Specifically, the low work function induced by Al doping facilitates electron transfer in the reaction, facilitating the dissociation of CH x O* into CH x *. Meanwhile, the presence of oxygen vacancies enhances the dissociative adsorption capacity of CO and facilitates the formation of CH x * species. The Zn x+ sites serve as active centers for carbon chain growth, promoting C–C coupling through the insertion of CO or CH x O* into CH x *, thereby achieving chain elongation.
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Coatings
·
2024
·Vol. 14
·期 2
·192
·
IF 2.9
Danye Zuo,Yuhong Yin,Liming Jiang,Zhi Xia,Chong Tan,Junsheng Li,Jinlong Zuo,Yuyang Wang
This study focuses on synthesizing a composite material of Ag/ZnO/BiOCl using Ag, ZnO, and BiOCl as raw materials. The material was prepared by loading Ag and BiOCl onto ZnO nanofilms, aiming to enhance the photocatalytic degradation of ciprofloxacin (CIP). Optimization of the photocatalytic degradation process through single-factor experiments revealed that under conditions of an initial CIP pH of 9, an Ag/ZnO/BiOCl dosage of 1 g/L, and an initial CIP concentration of 5 mg/L the conversion efficiency of CIP reached 98.79% after 150 min of exposure to a 250 W xenon lamp simulating sunlight. Furthermore, the composite material maintained a conversion efficiency of 86.17% for CIP even after five cycles of reuse, demonstrating its excellent stability. The optical properties, elemental composition, valence state, crystallinity, and morphology of the samples were analyzed using techniques such as X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), photoluminescence (PL), UV–visible diffuse reflectance spectroscopy (UV-vis DRS), Fourier-transform infrared spectroscopy (FTIR), and scanning electron microscopy (SEM). The results indicate that the introduction of Ag expanded the light response range of ZnO, while the addition of BiOCl improved the separation efficiency of electron–hole pairs in the composite nanomaterial. The photocatalytic mechanism was further elucidated through radical scavenging experiments, confirming that ·OH and h+are the main active species in the degradation process.
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PROGRESS IN ORGANIC COATINGS
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2024
·
IF 6.5
Zhe Li,Zenghui Tan,Yajun Xu,Wei Wei,Xiaojie Li,Jingcheng Liu
Lignin with increased polyhydroxyl content (LOH) was prepared via a one-pot synthesis using enzymatically hydrolyzed lignin (EHL) as the raw material. The modified structure and hydroxyl content of LOH were analyzed using FT-IR, 1 H NMR, and 31 P NMR. LOH was blended with zinc oxide (ZnO), polyester resin and hydroxyl alkyl amide (HAA) to prepare polyester powder coatings. The anti-UV properties of the coating were significantly enhanced by the addition of LOH and ZnO. The coating exhibits exceptional adhesion, rating at level 0, and achieves a pencil hardness of 7H. The gel time for the coating is 195 s, and it has a 5-degree Celsius increase in melting temperature, which greatly enhances its storage stability. Considering a range of factors, the formula LOH7.5 % has been identified as the optimal composition. The results of this study demonstrate an easy approach to developing sustainable lignin-based powder coatings with excellent properties.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Ying Gao,Jingxiang Zhang,Weisheng Yang,Hongqi Dai,Jizeng Wang
Nanostructured inorganic/wood-structural holocellulose hybrids offer new potential applications, including mechanical energy conversion, superhydrophobic materials, gas adsorption and so on. Owing to the anisotropy of wood, controlling the morphology of mineral particles inside porous holocellulose scaffold is still far from satisfactory. In this work, a homogeneous zinc oxide (ZnO) decoration inside wood-structural holocellulose scaffold was achieved while the morphology, distribution and content of ZnO micro-nano particles were controllable through changing the conditions of hydrothermal growth. The holocellulose scaffold was prepared through delignification and periodate oxidation, which is favorable for Zn 2+ capture and ZnO nuclei formation because of the surface charge increased. The controlled ZnO insertion was realized by changing metal salt concentration, temperature and hydrothermal time. The obtained multilayer ZnO could provide multiple light refractions and reflections and enhance the utilization of light. Consequently, with a minor ZnO loading (15 wt%), the ZnO/wood-structural hybrids could totally degrade methyl orange and methyl blue in 6 h. This novel and scalable synthesis method shows potential for both the design and photocatalytic activity of holocellulose hybrids.
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高影响因子
Journal of Materials Chemistry A
·
2024
·
IF 10.7
Chunzheng Wu,Jingyuan Lin,Zhuojiong Xie,Xuan Kai,Xiao Yu,Zhenyu Yan,Jinwei Fang,Shanliang Chen,Jianzhong Guo,Wei Wang,Fengping Peng
Temperature fluctuations caused by sunlight represent a form of low-quality thermal energy that is generally insufficient for driving chemical reactions. Here, we designed a ZnO–MXene (Ti3C2) heterostructure catalyst, which can harvest solar near-infrared (NIR) energy to drive the sluggish ammonia production reaction using water and N2 as the feedstock. Our research confirmed that ammonia was produced through a pyroelectric process, rather than a photocatalytic process. The ZnO–MXene heterostructure with ∼20 wt% of Ti3C2 exhibited a 6.5-fold improvement in activity compared to bare ZnO. The Ti3C2 not only harvests NIR energy to heat up the pyroelectric ZnO, but also traps the pyro electrons from ZnO and co-catalyzes the reduction of N2 to ammonia. This work offers a novel strategy for ammonia production utilizing the abundant solar NIR energy under ambient conditions.
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Small
·
2025
·
IF 12.1
Dongli Li,Zhan Zhang,Mingze Jiao,Yinan Dong,Shuyan Yu,Congju Li,Hongyan He,Jingkun Jiang,Kaihui Liu,Zehui Li
2D metal carbides/nitrides (MXenes) have attracted considerable interests in NH 3 sensing due to their high electrical conductivity and abundant terminal groups. However, the strong interlayer interactions between MXene nanosheets result in challenges related to sensor recovery and rapid response decay in MXene-based sensors. Here, A one-step hydrothermal strategy is developed that anchors Zn atoms and grows ZnO polycrystals on the Ti vacancies of Ti 3 C 2 T x layers, forming a sandwich-structured ZnO/Ti 3 C 2 T x heterojunction. At room temperature, the NH 3 sensitivity of ZnO/Ti 3 C 2 T x is a remarkable 45-fold higher than that of Ti 3 C 2 T x , with a low detection limit of 138 ppb and a rapid recovery time of 39 s. Furthermore, the heterojunction exhibits exceptional long-term stability, maintaining a consistent response over 21 days. The results confirm that in situ intercalation of the ZnO polycrystals effectively solves the recovery problem in MXene substrates by completely exfoliating the Ti 3 C 2 T x nanosheets. Meanwhile, the room-temperature sensing performance and recovery speed of the sandwich-structured ZnO/Ti 3 C 2 T x is enhanced by rapid electron conduction. This straightforward and effective route for in situ exfoliation and intercalation of MXene layers promises the broader use of 2Dmaterial heterojunctions in sensing applications.
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高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
·
IF 5.4
Yue Feng,Xun Liu,Jingyi Wang,Xinyu Zou,Dianlin Wang,Lei Xie
Nanostructures have been commonly incorporated into oil-water separation membranes to improve their antifouling properties. However, the antifouling mechanism of the membrane with different nanostructures is still unclear. In this work, ZnO nanostructures, i.e., nanorods, hollow nanorods and randomly assemble nanosheets, were constructed on polyvinylidene fluoride (PVDF) membrane surfaces. The resulted membranes exhibited improved antifouling properties in comparison with the pristine PVDF membrane, and the hollow nanorods showed the best antifouling property. The antifouling mechanism was investigated through direct force measurements between oil drops and membrane surfaces using atomic force microscopy. The theoretical analysis of approach force curves indicated that the repulsive electrical double layer force was enhanced at higher pH and in the presence of ZnO nanostructures, which prevented the oil attachment on the membrane surface. The retraction force curves suggested that the adhesion between oil and membrane was significantly affected by the ZnO nanostructures, and the adhesion followed the trend of hollow nanorods < randomly assemble nanosheets < nanorods. Consequently, the oil drops on the membrane with hollow nanorods could be easily removed by water rinsing, which agreed with the flux recovery results. This work provided a fundamental understanding of the antifouling mechanism of the oil-water separation membranes with nanostructures, and a useful guidance for constructing suitable surface structures for efficient oil-water separation membranes.
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