SEPARATION AND PURIFICATION TECHNOLOGY
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2023
·
IF 8.6
Yanan Li,Haiyu Luo,Wenlan Ji,Shuming Li,Pei Nian,Nan Xu,Nong Ye,Yibin Wei
Two-dimensional (2D) Ti 3 C 2 T x MXene nanosheets have been identified as promising for constructing ultrathin laminar nanostructures with nanoscale water transport channels for water purification. Herein, ZnO@Ti 3 C 2 T x MXene nanofiltration (NF) membranes were prepared via coupling ZnO nanoflowers to the Ti 3 C 2 T x MXene-based laminar nanostructure, which exhibited photocatalytic self-cleaning properties driven by visible light for enhanced organic dye removal. The physicochemical properties and NF performance with and without photocatalytic treatment were systematically characterized. The prepared ZnO@Ti 3 C 2 T x MXene NF membrane could reject 95.44% Congo red (CR) and demonstrated an excellent water permeability of 138.81 L·m −2 ·h −1 ·bar −1 (LMH/bar). In comparison to the Ti 3 C 2 T x MXene membrane and the same amount of ZnO powders, the ZnO@Ti 3 C 2 T x MXene membrane demonstrated higher photodegradation performance to 10 ppm MB. Impressively, the membrane showed an enhanced separation performance for 6 cycles with a RhB rejection > 88.48% and a permeability of 138.69 LMH/bar. Lastly, the synergistic photocatalytic mechanism of ZnO@Ti 3 C 2 T x MXene composite nanostructure was investigated. Such results may offer a novel insight for the fabrication of laminar structured Ti 3 C 2 T x MXene-based NF membranes with photocatalytic induced anti-fouling performance for enhanced dye water purification.
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高影响因子
Nanomaterials
·
2023
·Vol. 13
·期 14
·2033
·
IF 5.3
Hua Yang,Jialin Zhang,Zhuoran Li,Jinrong Huang,Jun Wu,Yixuan Zhang,Honghua Ge,Yuzeng Zhao
The effect of ZnO nanoparticles (ZnO NPs), with different concentrations in simulated water, on the activity of sulfate-reducing bacteria (SRB) and their adhesion behaviour on stainless-steel surfaces, with and without visible light treatment, were investigated. The results showed that the concentration of ZnO NPs and light treatment greatly influenced the antibacterial performance of the NPs. In the water solution without light treatment, the low concentration (no more than 1 mg/L) of ZnO NPs in the aqueous solution promoted the growth of SRB, and the amount of biofilm attached to the stainless-steel surface increased. As the concentration increased, ZnO NPs exhibited antibacterial effects. In water under visible light irradiation, ZnO NPs showed antibacterial performance at all the concentrations studied (0.5~50 mg/L), and the antibacterial efficiency increased with the increase in the concentration of NPs. The determination results of the reactive oxygen species showed that light treatment can stimulate ZnO NPs in water to generate ·OH and O2·−, which exhibited good antibacterial properties. The adhesion amount of SRB on the stainless-steel surface was inversely proportional to the antibacterial efficiency of ZnO NPs.Keywords:ZnO nanoparticles;sulfate-reducing bacteria;antibacterial activity;biofilm
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高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2022
·Vol. 106
·期 3
·2169-2183
·
IF 4.186
Yunyun Bao,Yan Liu,Changfu Wang,Yun Wang,Dingzhong Yuan,Zuqing Zhu,Jianda Xu,Jinbiao Liu
In this study, a new type of ceramic composite (PZSC/ZnO) was successfully synthesized using N, P, and S co-doped carbon microspheres derived from polyphosphazene with zinc oxide. The morphology and structure were characterized by Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, scanning electron microscopy, energy-dispersive spectroscopy, Raman, X-ray diffraction, BET, and thermogravimetric. Batch experiments were used to explore the adsorption performance under different pH values, initial concentrations, contact times, and temperatures. The results showed that the maximum adsorption capacity of the PZSC/ZnO ceramic composite for uranium was 470.5 mg/g (pH = 5.5, t = 40 min, and T = 25°C). The adsorption process followed the nonlinear Langmuir model and the pseudo-second-order kinetic model, demonstrating that the monolayered combination of U(VI) with the PZSC/ZnO ceramic composite and the adsorption mechanism was chemical adsorption. Thermodynamic data revealed that the adsorption was a spontaneous endothermic process. Furthermore, P and N may be involved in the adsorption of uranyl ions through binding to the O atoms from ZnO. The main forces between U(VI) and the PZSC/ZnO ceramic composite were attributed to ZnO and heteroatoms doped in the material.
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APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Gang Shu,Dan Xu,Songtao Xie,Li-Jen Chang,Xinyue Liu,Jianqing Yang,Yunchun Li,Xianxiang Wang
This study aimed to develop a novel ZnO-quantum dots-Chitosan biocomposite dressing (CS-ZnO QDs) with improved antioxidant, antibacterial, and potential infected wound healing effects. CS-ZnO QDs were synthesized successfully by incorporating ZnO QDs into chitosan, and in vitro antioxidant, antibacterial and anti-biofilms tests were conducted. Furthermore, the therapeutic effects of CS-ZnO QDs for infected wound healing were investigated. The results of the character study revealed steady compatibility between chitosan and ZnO QDs. Nonetheless, the in vitro antioxidant and antibacterial studies showed that CS-ZnO QDs had better antioxidant activity, inhibitory effects against methicillin-resistant Staphylococcus aureus (MRSA), and a vigorous eradication of bacterial biofilms compared to ZnO-QDs and CS alone. CS-ZnO QDs presented stable cyto-compatibility in NIH/3T3s cells. In addition, CS-ZnO QDs facilitated MRSA-infected wound healing by inhibition of bacterial growth, regulation of the NFκB-p65 pathway to alleviate inflammation, improve wound repairing in an adequate environment, and directly enhance re-epithelialization and collagen deposition.
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高影响因子
Journal of Environmental Chemical Engineering
·
2022
·
IF 7.968
Jian Fang,Jing-Jing Xue,Rong-Pu Xiao,Xi Chen,You-Min Guo,Ji-Ming Song
The development of high performance triethylamine (TEA) sensors for the protection of human safety is essential. Herein, we reported a promising semiconductor metal oxide (SMO) gas sensor based on Pr-doped ZnO nanospindles as the sensing materials for the detection of TEA. The elemental composition and micromorphology of the as-prepared samples were systematically analyzed. The gas sensing performance of the pristine, 1 mmol%, 2 mmol%, and 3 mmol% Pr-ZnO sensor was evaluated. Among them, the 2 mmol% Pr-ZnO sensor exhibited the highest response value for TEA gas, and reached 158.0 towards 50 ppm TEA at 200 °C, which was about 10.0-fold higher than the response value of the pristine ZnO sensor. In addition, the 2 mmol% Pr-ZnO sensor also showed good reproducibility, rapid response/recovery time (10/46 s), theoretical limit of detection (168 ppb), outstanding long-term stability, and excellent selectivity for TEA gas.
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JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2022
·Vol. 103
·期 3
·890-897
·
IF 2.606
Tian Zhennan,Wu Taiqi,Hu Rong,Yu Junsheng,Cheng Jiang,Li Lu
In this study, a ZnO-Fe 2 O 3 thin film was designed as electron transport layer for organic solar cells (OSCs). The preparation strategy was based on the spin coating of aqueous sol–gel precursor. The result showed that composite ZnO-Fe 2 O 3 -based OSCs had higher power conversion efficiency than pure ZnO-based OSCs. To explain this result, morphology, optical and physical properties of ZnO-Fe 2 O 3 were investigated to analyze the relation between structure of interface layer and performance of OSCs. It was demonstrated that composite ZnO-Fe 2 O 3 layer had denser structure and lower surface roughness than pure ZnO layer. Thus, it showed a good contact with the active layer. Furthermore, 3.3% Fe 2 O 3 could reduce the W F and E g of ZnO, and greatly enhanced electron mobility from the acceptor (IT-4F) phase to the ZnO/ITO electrode. Meanwhile, ZnO-Fe 2 O 3 layer showed a low reflectivity that allowed more photons to entrance the active layer for utilization. Hence, the higher short-circuit current and power conversion efficiency were achieved in ZnO-Fe 2 O 3 -based OSCs.
Graphical abstract
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Journal of Materials Chemistry A
·
2022
·Vol. 10
·期 28
·15136-15145
·
IF 14.511
Na Luo,Haijie Cai,Xiaojie Li,Mengmeng Guo,Chen Wang,Xiaohong Wang,Pengfei Hu,Zhixuan Cheng,Jiaqiang Xu
The construction of sensitive and durable sensitizers facilitates the development of metal oxide semiconductor (MOS)-based sensors with excellent gas sensing performance. Here, amorphous ruthenium oxide (RuOx) doped with lithium ions was successfully synthesized, and employed as a sensitizer to enhance the gas response of ZnO sensing materials. The gas sensing test results show that amorphous RuOx has better sensitization effects on ZnO than crystalline RuO2 at an optimum working temperature of 210 °C, such as a higher response, lower working temperature, better selectivity and faster response/recovery speed. The response of the RuOx/ZnO-1 sensor remains almost unchanged over a period of 60 days, while the RuOx sensitizer loaded on ZnO retains an amorphous structure after 60 days of working. Ex situ XPS also demonstrates that amorphous RuOx does not crystallize into polycrystalline RuO2 at 210 °C. The enhanced gas-sensing performance of the RuOx/ZnO-1 sensor can be attributed to the abundant active sites and better catalytic performance of amorphous RuOx, as well as enhanced electronic transmission between RuOx and ZnO. This is the first report showing that amorphous RuOx can work stably as a sensitizer at high temperature (210 °C), which facilitates the widespread use of amorphous metal catalysts in various fields.
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INDUSTRIAL CROPS AND PRODUCTS
·
2022
·
IF 6.449
Zuozhu Yin,Min Li,Zhiwei Chen,Xiaoxiang Chen,Kaiyuan Liu,Dongpeng Zhou,Mingshan Xue,Junfei Ou,Yu Xie,Sheng Lei,Chan Xie,Yidan Luo
Bio-based membranes for removing organic dye and microorganism-containing complicated oil-water effluents simultaneously are sustainable, low-cost, renewable, biodegradable, and nontoxic. Here, a robust, sustainable and molecular-level superhydrophobic Pulp/cellulose nanofiber (CNF) composite membrane (SPCCM) via crosslinking of nanofibers and coating ZnO suspensions for accomplishing this purpose is proposed. The results show that this designed SPCCM has superior superhydrophobicity (water contact angle: 163 ± 2°) and superoleophilicity (oil contact angle: 0 °), which has a great separation efficiency for separating oil-water mixture (92 %) and a high flux (1435 L·m −2 ·h −1 ·bar −1 ). Moreover, SPCCM showed good durability in harsh environment (such as: bending, corrosion solution, temperature, etc). It also showed that the synergistic impact of electrostatic adsorption and ZnO photocatalyst is responsible for the high degradation capacity (Degradation under visible light using 300 w xenon lamp, high degradation efficiency up to 98 %). Furthermore, the SPCCM had a high level of anti-biofouling for microorganisms. Thus, the SPCCM mainly derived from sustainable pulp fibers showed potential performance for oil/water separation and water purification .
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高影响因子
Journal of Nanomaterials
·
2022
·
IF 3.791
Qiqi Chang,Jun Xu,Yijun Han,Andrea Ehrmann,Tianhong He,Ruiping Zheng
As the electron transport layer of dye-sensitized solar cells (DSSCs), the photoanode is an important component that affects photoelectric conversion efficiency (PCE). The commonly used material titanium dioxide (TiO2) is difficult to prepare as nanostructures with large specific surface area, which affects dye loading and electrolyte diffusion. Herein, TiO2 nanofibers and ZnO-TiO2 composite nanofibers with different molar ratios are synthesized by electrospinning technology. The above nanofibers are coated on photoanodes by the doctor blade method to assemble DSSCs. The influence of the composite ratio of ZnO-TiO2 composite nanofibers on the photoelectric performance of the assembled DSSCs is explored. The ZnO-TiO2 composite nanofibers with a molar ratio of 1 : 2 have large specific surface area and porosity and have the smallest charge transfer resistance at the photoanode-electrolyte interface. The PCE of the nanofiber-modified DSSCs reaches a maximum of 3.66%, which is 56% higher than that of the TiO2 nanofiber-modified DSSCs. The photovoltaic parameters such as open circuit voltage (VOC), current density (JSC), and fill factor (FF) are 0.58 V, 10.36 mA/cm2, and 0.61, respectively. Proper compounding of zinc oxide (ZnO) can not only make the nanofibers absorb more dyes and enhance the light-harvesting ability but also improve the diffusion of the electrolyte and enhance the electron transport, thus successfully improving the power conversion efficiency of DSSCs.
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高影响因子
Materials
·
2022
·Vol. 15
·期 9
·3408
·
IF 3.748
Leilei Zhang,Yihua Lv,Xiaoyun Ye,Lian Ma,Song Chen,Yuping Wu,Qianting Wang
In this study, zinc oxide (ZnO)/polypyrrole (PPy) composites with flower- and rod-like structures were successfully fabricated by in situ polymerization and the hydrothermal method and used as microwave absorption (MWA) materials. The surface morphologies, crystal structures, and electromagnetic features of the as-prepared samples were measured by field-emission scanning electron microscopy (FE-SEM), energy dispersive spectroscopy (EDS), X-ray diffraction (XRD), and vector network analyzer (VNA). The results show that the conductive polymer PPy was successfully decorated on the surface of ZnO substrates. The MWA ability of flower- and rod-like ZnO/PPy composites is significantly enhanced after introduction of PPy. Rod-like ZnO/PPy composites exhibited superior MWA properties than those of flower-like ZnO/PPy. The former achieved a minimum reflection loss (RLmin) of −59.7 dB at 15.8 GHz with a thickness of 2.7 mm, and the effective absorption bandwidth (EAB,RL< −10 dB) covered 6.4 GHz. PPy addition and stacked structure of rod-like ZnO/PPy composites can effectively improve the dielectric properties, form multiple reflections of incident electromagnetic waves, and generate an interfacial polarization effect, resulting in improved MWA properties of composite materials.Keywords:ZnO;polypyrrole;composites;microwave absorption;dielectric loss
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高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Chenyang Wang,Jihui Wang,Wenbin Hu
ZnO@ZIF-8 films were prepared on Q235 steel surface through solvothermal reaction by pre-electrodepositing ZnO films and modified with stearic acid (SA). The surface morphology , elements content, crystal structure and chemical structure of films were studied by scanning electron microscopy (SEM), energy dispersive spectrometer (EDS), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). The wettability of films was measured by water contact angle meter. The corrosion behavior of films was tested by Electrochemical tests. ZnO films show hexagonal nanotubular morphology, having the best compactness and corrosion resistance at deposition current density of 2.3 mA/cm 2 with the protection efficiency of 90.11%. After solvothermal reaction, ZIF-8 grains are formed and clad ZnO nanotubes , forming a contact film to prevent corrosive ions attacking steel efficiently. ZnO@ZIF-8 films have the best compactness and corrosion resistance at Zn 2+ concentration of 0.06 mol/L with the protection efficiency of 99.83%. But the corrosion resistance of ZnO@ZIF-8 film declines quickly for the water molecules can get inside the film and destroy the bond between ZIF-8 grains. Thus, SA was grafted to ZnO@ZIF-8 film to enhance its hydrophobicity . After SA modification, the protection efficiency reaches 99.99% and maintains at 95.29% after 14 days immersion in the solution of 3.5 wt.% NaCl .
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高影响因子
Materials Research Express
·
2022
·Vol. 9
·期 1
·016302
·
IF 2.025
Meizhen Zhuo,Chun-e Huang,Changzhi Zhao,Jiongjiong Yin,Chunying Shen
ZnO linear resistance ceramics were synthesized from ZnO–Al2O3–MgO–TiO2–SiO2–Ta2O5 by a conventional ceramics method. Effects of Ta2O5 on the phase composition, microstructures, and electrical properties of ZnO linear resistive ceramics were investigated. The results show that doping with appropriate amount of Ta2O5 can refine the grains of the main crystalline phase ZnO and the secondary crystalline phase ZnAl2O4 in terms of microstructure, and also can reduce the grain boundary barrier and optimize the I–V characteristics in terms of electrical properties. In addition, the doping of Ta2O5 can improve the stability of the resistivity , and the impedance frequency indicates that the doping of Ta2O5 makes the sample suitable for high-frequency electric fields. The resistivity of the sample doped with 0.2 mol% Ta2O5 is 56.2 Ω·cm, and this sample has the best grain boundary barrier height, nonlinear coefficient and temperature coefficient of resistance of 0.054 eV, 1.04 and −3.48 × 10−3 °C−1, respectively.
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