COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2023
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IF 5.2
Yinlong Li,Yingqing Zhan,Yiwen Chen,Hongshan Jia,Ximin Chen,Fei Zhu,Xulin Yang
Two-dimensional (2D) MXene nanosheets have emerged as a promising candidate as functional filler for anticorrosion coating. However, the self-stacking of MXene nanosheets and high conductivity limited the long-term anticorrosion ability of the coating. Herein, the ZnO quantum dots (ZnO QDs) decorated MXene hybrid was prepared via electrostatic assembly, which was modified by aminosilane-functionalized with 3-aminopropyltriethoxysilane (ATPES) and used as functional filler for reinforcing the waterborne epoxy coating (WEP) via simple spraying technique. Benefiting from the improved dispersion and synergy of ZnO QDs and MXene nanosheets , the WEP coating exhibited favorable anticorrosion performance. For 0.50 wt% F-MXene@ZnO QDs/WEP composite coating , the impedance remained 1.25 × 10 8 Ω cm 2 (0.01 Hz) after immersing in 3.5 wt% NaCl medium for 30 days, which was three orders of magnitude higher than pure WEP. The EDS analysis and salt spray test strongly supported the long-term corrosion resistance of WEP composite coating. Furthermore, the reasonable anti-corrosion performance of composite coating including the physical barrier and charge neutralization effect was illustrated. This work expands the 2D MXene as a functional filler for enhancing the anticorrosion ability of waterborne epoxy coating.
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Journal of Materials Research and Technology-JMR&T
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2023
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IF 6.4
Xiaojuan Li,Jun Wu,Fangtao Ruan,Zhenzhen Ge,Toshiaki Natsuki,Hua Wang,Maoli Yin
Silk, a popular luxury textile with many years of history, is easy to embrittle and adsorb bacteria when stored for a long time or exposed to sunlight, which affects its service life. To improve the silk fabrics with excellent antibacterial activity, washing and aging durability, and UV shielding, multifunctional silk fabrics were designed and fabricated via a green finishing approach. Here, we proposed a simple strategy to fabricate silk fabrics with multi-functions via coating clavate-shaped ZnO nanoparticles (ZF-silk fabrics) by dipping and pressing for cycles. The scanning electron microscope (SEM), fourier transform infrared (FTIR), ultraviolet visible spectrophotometry (UV–Vis), and X-ray diffraction (XRD) were used to analyze the structure and properties of fabricated ZF-silk fabrics. Compared with raw silk fabric, the fabricated ZF-silk fabrics represented excellent UV shielding, good tensile strength, and superior antibacterial activity. Notably, the ZF-silk fabrics had good washing stability and aging resistance. In addition, the ZF-silk fabrics possessed superior antibacterial activity before and after aging treatment (under UV radiation for 72 h). Therefore, the durable and multifunctional ZF-silk fabrics indicate great potential for achieving to realize a long service life of the fabrics.
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MOLECULES
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2023
·Vol. 28
·期 19
·6827
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IF 4.6
Jun Wang,Dongliang Liu,Shun Yuan,Bo Gao,Lin Cheng,Yu Zhang,Kaijia Chen,Aimin Chen,Lianbi Li
Plasmonic-enhanced photocatalysis using visible light is considered a promising strategy for pollution photodegradation. However, there is still a lack of comprehensive and quantitative understanding of the underlying mechanisms and interactions involved. In this study, we employed a two-step process to fabricate arrays of ZnO nanosheets decorated with Au nanoparticles (Au-ZnO NS). Various characterization techniques were used to examine the morphological, structural, and chemical properties of the fabricated Au-ZnO NS array. Furthermore, we systematically investigated the photocatalytic degradation of methyl orange under visible light irradiation using Au-ZnO NS arrays prepared with varying numbers of photochemical reduction cycles. The results indicated that as the number of photochemical reduction cycles increased, the photodegradation efficiency initially increased but subsequently decreased. Under visible light irradiation, the Au-ZnO NS array obtained via four cycles of photochemical reduction exhibits the highest photocatalytic degradation rate of methyl orange 0.00926 min−1, which is six times higher than that of the ZnO NS array. To gain a better understanding of the plasmonic effect on photodegradation performance, we utilized electromagnetic simulations to quantitatively investigate the enhancement of electric fields in the Au-ZnO NS array. The simulations clearly presented the nonlinear dependencies of electric field intensity on the distribution of Au nanoparticles and the wavelength of radiation light, leading to a nonlinear enhancement of hot electron injection and eventual plasmonic photodegradation. The simulated model, corresponding to four cycles of photochemical reduction, exhibits the highest electric field intensity at 550 nm, which can be attributed to its strong plasmonic effect. This work provides mechanistic insights into plasmonic photocatalysts for utilizing visible light and represents a promising strategy for the rational design of high-performance visible light photocatalysts.Keywords:Au nanoparticle decorated ZnO nanosheets arrays;visible light plasmon-enhanced photocatalysis;hot electron injection;electromagnetic simulations
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Defence Technology
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2023
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IF 5.1
Jialu Yang,Jiaheng Hu,Yinghua Ye,Jianbing Xu,Yan Hu,Ruiqi Shen
Self-destructing chips have promising applications for securing data. This paper proposes a new concept of energetic diodes for the first time, which can be used for self-destructive chips. A simple two-step electrochemical deposition method is used to prepare ZnO/CuO/Al energetic diode, in which N-type ZnO and P-type CuO are constricted to a PN junction. This paper comprehensively discusses the material properties, morphology, semiconductor characteristics, and exploding performances of the energetic diode. Experimental results show that the energetic diode has typical rectification with a turn-on voltage of about 1.78 V and a reverse leakage current of about 3 × 10 −4 A. When a constant voltage of 70 V loads to the energetic diode in the forward direction for about 0.14 s or 55 V loads in the reverse direction for about 0.17 s, the loaded power can excite the energetic diode exploding and the current rises to about 100 A. Due to the unique performance of the energetic diode, it has a double function of rectification and explosion. The energetic diode can be used as a logic element in the normal chip to complete the regular operation, and it can release energy to destroy the chip accurately.
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CHEMICAL ENGINEERING JOURNAL
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2023
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IF 15.1
Zequn Zhang,Yuan Shu,Qian Liu,Shuxian Bi,Pengfei Zhang
Colloidal nanoparticles with uniform particle size distribution, tailored exposed facets, and controllable compositions appealed to broad interests in heterogeneous catalysis. Nevertheless, due to the strong attachment of capping agents to the nanoparticles, cleaning the nanoparticle surface without changing the size of nanoparticles remains a significant challenge. Herein, based on the double confinement of the strong metal-support interaction (SMSI) effect and carbon encapsulation, the well-stabilized Ni-ZnO-S3 catalyst was successfully synthesized. The size of Ni nanoparticles after calcination in the sequence of H 2 -N 2 mixture, air, and H 2 -N 2 mixture remained below 5 nm. Due to no significant size change in Ni nanoparticles, the prepared Ni-ZnO-S3 catalyst served well as model catalysts in the RWGS reaction, where the CO 2 conversion and CO yield increased proportionally to the Ni loading weight. According to the result of in-situ FTIR, an associative mechanism of RWGS reaction over Ni-ZnO-S3 was also identified. Therefore, this dual protect strategy provides a potential solution for building highly anti-sintering catalysts based on the colloidal synthesis route.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2023
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IF 8.2
Jiaying Chen,Fangfei Liu,Tursun Abdiryim,Hongyan Yin,Xiong Liu
Photocatalysts immobilized on hydrogels is a win-win mode, which not only improves photocatalysis but also successfully prevents catalyst loss, making it easy to separate and reuse during catalytic process. Here, ZnO-Ti 3 C 2 T X photocatalysts are loaded into the chitosan/polyacrylic acid hydrogel networks, realizing the efficiently photocatalytic degradation of norfloxacin. The chitosan-based composite hydrogel features rich functional groups and a dense pore structure, which is beneficial to antibiotic enrichment and photocatalytic degradation. The effects of different catalyst ratios, dosage, initial concentrations and pH on the degradation efficiency are investigated. The norfloxacin degradation rate constant is 0.012 min −1 and its degradation efficiency reaches up to 90 % after 240 min. Importantly, the photocatalytic composite hydrogel still retains 85 % degradation efficiency after 6 cycles. Moreover, e − plays a significant role in the degradation process. This work converts the traditional powder photocatalysts into bulk photocatalysts (photocatalytic hydrogels) to accomplish efficient degradation and rapid recycling for contaminant removal.
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ENVIRONMENTAL RESEARCH
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2023
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IF 8.3
Chuanhui Geng,Qingguo Chen,Zhenzhen Li,Mei Liu,Zhi Chen,Hengcong Tao,Qiao Yang,Baikang Zhu,Lijuan Feng
In this study, we investigated the doping of Fe–N–C with ZnO (Fe–N–C@ZnO) to enhance its performance in the reduction of biological toxicity and degradation of enrofloxacin (ENR) in seawater. The steady-state/transient fluorescence analysis and free radical quenching test indicated an extremely low electron–hole recombination rate and the generation of reactive oxygen species in Fe–N–C@ZnO, leading to an improvement in the energy efficiency. We compared the ENR degradation efficiencies of Fe–N–C@ZnO and ZnO using both freshwater and seawater. In freshwater, Fe–N–C@ZnO exhibited a slightly higher degradation efficiency (95.00%) than ZnO (90.30%). However, the performance of Fe–N–C@ZnO was significantly improved in seawater compared to that of ZnO. The ENR degradation efficiency of Fe–N–C@ZnO (58.87%) in seawater was 68.39% higher than that of ZnO (34.96%). Furthermore, the reaction rate constant for ENR degradation by Fe–N–C@ZnO in seawater (7.31 × 10 −3 min −1 ) was more than twice that of ZnO (3.58 × 10 −3 min −1 ). Response surface analysis showed that the optimal reaction conditions were a pH of 7.42, a photocatalyst amount of 1.26 g L −1 , and an initial ENR concentration of 6.56 mg L −1 . Fe–N–C@ZnO prepared at a hydrothermal temperature of 128 °C and heating temperature of 300 °C exhibited the optimal performance for the photocatalytic degradation of ENR. Based on liquid chromatography–mass spectrometry analysis, the degradation processes of ENR were proposed as three pathways: two piperazine routes and one quinolone route.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2023
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IF 22.1
Ziyang Chen,Jinjun Wen,Yu Zeng,Mengyuan Li,Yukun Tian,Fan Yang,Molly Meng-Jung Li,Peirong Chen,Haomin Huang,Daiqi Ye,Limin Chen
Cu/ZnO-based catalysts have been extensively and intensively studied for CO 2 hydrogenation to methanol due to their relatively superior catalytic performance. However, the mediocre methanol selectivity over Cu/ZnO-based catalysts has not been disclosed mainly because the predominant by-product CO formation activity fails to arouse any attention, significantly deterring the further catalyst optimization. The ZnOx-Cu nanoparticles (NP)-ZnO interface, derived from strong metal-support interactions (SMSI), has been recognized to be more active for methanol formation compared with the classical direct contact Cu-ZnO interface. In order to disclose the origin of the mediocre methanol selectivity, these two types of Cu-ZnO interfaces have been designed and constructed through carefully manipulating the synthesis and heat pre-treatment conditions of the powder model catalysts. Then, methanol and CO formation behaviors over these two interfaces have been explored thoroughly in actual reaction conditions. Finally, the origin of the mediocre methanol selectivity over Cu/ZnO-based catalysts has been proposed. This work provides unique insights for designing efficient Cu/ZnO-based catalysts with high methanol selectivity and yield and puts forward an effective strategy to investigate the catalytic behaviors over different interfaces in actual reaction conditions.
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COMPOSITE STRUCTURES
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2023
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IF 6.3
Shulan Jiang,Ruyi Hu,Xuefeng Liu,Yanyan Cui,Yiru Ren,Hongyong Jiang
This study designs novel hierarchical microstructures of CFRP/Al interface with ZnO-NanoStructures (ZnO-NS) and Modified Resin Pre-Coating (RPC) to in-situ form nano-mechanical interlocking . ZnO-NSs with different growth times are fabricated by hydrothermal method , while the traditional RPC technology is modified by mixing resin-hardener-acetone with different ratios. Combining ZnO-NS and modified-RPC, difficultly infiltrated nanogaps among ZnO-NSs can be fully filled with resin to form flawless interface. Results show that the shear force firstly increases and then decreases with increasing growth time. As compared with no-ZnO-NS, 6 h-ZnO-NS presents a 207.5% higher shear force. When using ZnO-NS with RPC, an obvious reduction confirms that nanogaps are difficult to be infiltrated even through RPC technology. It is interesting that the shear property of sample with the modified RPC firstly increases and then decreases as the ratio changes. An improvement around 275.0% in shear force is identified for the modified-RPC with the ratio of resin, acetone and hardener (3:1:0.6) due to in-situ formed stronger nano-mechanical interlocking. The strengthening mechanisms are analyzed based on failure modes with different ZnO-NS-bridging length. The proposed method is of significance in lightweight material joining technology.
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Surfaces and Interfaces
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2023
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IF 6.2
Sarah Omar,Mirna Omar,Nour F. Attia,Gehan M. El-Subruiti,Abdelazeem Eltaweil
Cleaner production processes in conjunction with sustainability is the main requirement for clean and cost-effective industrial process. Moreover, the rapid growth of the world population in conjunction with limited sources of drinking water anticipated water crisis in many countries. Herein, indirect Z-scheme ZnO-3%SrO-2CdS photocatalyst was fabricated for the first time via thermal treatment and well identified by XRD, FT-IR, SEM, EDX and, XPS, meanwhile, the optical properties were evaluated using DRS, PL, and EPR analyses. The photocatalytic activity of noble metal free ZnO-3%SrO-2CdS was investigated in the photodegradation of six antibiotics, namely tetracycline, doxycycline, ofloxacin, amoxicillin, cephalexin, and sulfamethoxazole. Furthermore, kinetic study, pH, initial concentration, dosage, mass ratio, photoreactor type and different water source parameters have been investigated. Results demonstrated a high removal efficiency of tetracycline by ZnO-3%SrO-2CdS of 98.8% within 120 min at pH 7 and dosage 10 mg. This high efficiency could be attributed to SrO channels that facilitate charge migration process and conserve electrons/holes with high redox power for reactive oxygen species production. Besides, the hydroponics study to examine the phytotoxicity of treated tetracycline solution reflected the effectiveness of the treating process since T. foenum-graecum seeds were germinated successfully in the treated tetracycline solution.
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ACS Applied Materials & Interfaces
·
2023
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IF 9.5
Jinhao Zhang,Xin Wang,Zhiwei Yang,Jian Wang,Jiacheng Cao,Qian Chen,Shilong Yu,Jian Zhang,Tianwen Guo,Hai Li,Xiao Huang
Eutectic gallium–indium alloy (EGaIn) is a biocompatible liquid metal, promising for wearable electronics. Through functionalization and formation of composites, EGaIn-based materials have shown potential in multifunctional sensing devices. Here, egg-shell EGaIn/Ag/ZnO ternary composite particles were prepared through an ultrasound-assisted displacement reaction combined with room-temperature hydrolysis. The composite was further constructed as a wearable sensor capable of both pressure and proximity detection. For pressure sensing, due to the decrease in the Young’s modulus of the egg-shell structure and the presence of the electrical double layers between Ag and ZnO, which enriched surface charges, the sensor showed excellent sensitivity at low pressures (2.17 KPa–1, <0.4 KPa) and thus the ability to sense body movements. For proximity sensing, the composite sensor was able to detect approaching objects that were up to 20 cm away. By combining and fitting the sensing curves for both the touchless and touching modes, the extracted parameters were used to create fingerprints for different objects, demonstrating the great potential of our sensor in the differentiation and identification of unknown objects for future robotics and artificial intelligence.
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INDUSTRIAL CROPS AND PRODUCTS
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2023
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IF 5.9
Xiaojing Qin,Rongrong Tao,Song Cheng,Baolin Xing,Weibo Meng,Yanhe Nie,Chuanxiang Zhang,Jianglong Yu
ZnO based-double functional biochar (ZnO-BC) derived pine sawdust is prepared by microwave heating using simple one-pot method for levofloxacin (LEV) and Cr(Ⅵ) removal from wastewater. ZnO-BC has well developed pore structure with BET surface area of 915.47 m 2 /g, which also has well ZnO crystalline. These characteristics make ZnO-BC available as the adsorbent and photocatalyst for LEV and Cr(Ⅵ) removal wastewater. LEV and Cr(Ⅵ) adsorption date fit well with the Hill and Pseudo-second order equation with LEV and Cr(Ⅵ) adsorption amount of 193.42 and 21.03 mg/g, respectively. The LEV and Cr(Ⅵ) adsorption behavior are determined by the chemisorption process. The hydrogen bond, π-π interaction, surface complexation, pore filling are responsible for LEV removal. While the hydrogen bonding, complexation and redox are crucial to the removal of Cr(Ⅵ) from wastewater. LEV removal is 85.72–97.19% at 15–25 mg/L at 120 min, and Cr(Ⅵ) removal is 72.62–99.9% at 40–60 mg/L at 75 min under UV irradiation. The possible photocatalytic mechanisms of the LEV and Cr(Ⅵ) are further investigated and analyzed.
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