CHINESE JOURNAL OF ANALYTICAL CHEMISTRY
·
2023
·
IF 1.2
Gulgina Mamtmin,Patima Nizamidin,Reyanggu Abula,Abliz Yimit
Composite optical waveguide sensors show immense potential for the trace-level detection of harmful gases owing to their high sensitivity. Herein, we prepared a highly sensitive ZnO film/K + ion-exchanged composite optical waveguide sensor by fixing a thin ZnO film layer on the surface of a K + ion-exchanged glass optical waveguide. To study the influence of the preparation method on the gas sensitivity of the sensing element, 5,10,15,20-tetrakis-(4-methoxyphenyl)porphyrin was used as a sensing layer on the surface of the ZnO film and fixed via the spin-coating and immersion methods. The gas sensitivity of the sensors prepared by the two methods was comparatively studied. The sensor elements prepared by the immersion method showed higher sensitivity than those prepared by the spin-coating method. Furthermore, the reasons for the difference in the gas sensitivity are discussed in detail. The experimental results show that the as-prepared sensor can detect ppt levels of H 2 S and SO 2 gases and has potential application in the detection of trace levels of sulfide gases in the environment and in industrial production.
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ACS Applied Nano Materials
·
2023
·
IF 5.9
Shushu Chao,Yiqiu Zhang,Shihong Cheng,Xinzhe Shao,Songlin Liu,Wenjuan Lu,Yanfeng Wang,Pingping Zhang,Qingqiang Yao
Based on the opportunities of ibuprofen administration innovation and challenges associated with the construction of transdermal drug delivery systems using medicated nanoparticles and electrospun nanofiber membranes, we developed a transdermal drug delivery system comprising ibuprofen-loaded ZnO nanoparticles/polyacrylonitrile electrospun nanofiber membranes (ZnO-ibuprofen/PAN), which was dual-stimulus responsive, wherein both pH and temperature triggered drug release. ZnO-ibuprofen nanoparticles with high drug loading capacity (17.7%) were prepared at room temperature by a one-step method involving 4,4′-((4-(4H-1,2,4-triazol-4-yl) phenyl) azanediyl)dibenzoic acid, Zn(NO3)2·6H2O, and ibuprofen, following which electrospinning was conducted to generate the ZnO-ibuprofen/PAN nanofibers. The transdermal drug release behavior of the ZnO-ibuprofen/PAN electrospun nanofiber membranes in the normal (pH = 7.4, 37 °C) and inflammatory (pH = 6.5, 42 °C) tissue environment exhibited increased drug release rate at higher ambient temperatures and decreased pH following 24 h of drug release. The cumulative drug release rate of ZnO-ibuprofen/PAN electrospun fibers through porcine skin under inflammatory conditions reached 71.35% ± 2.96% after 24 h, thereby demonstrating their favorable transdermal permeation behavior. The cytotoxicity assays revealed that the nanofibers possessed excellent biocompatibility. Thus, the dual stimulus-responsive ZnO-ibuprofen/PAN can be an effective transdermal drug delivery carrier.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2023
·
IF 22.1
Jinxian Feng,Junyan Li,Lulu Qiao,Dong Liu,Pengfei Zhou,Jun Ni,Hui Pan
Zn-based materials are regarded as a family of promising electrocatalysts for electrochemical CO 2 reduction reaction (e-CO 2 RR), especially for the CO 2 -to-CO conversion. However, their electrocatalytic performances should be improved and the conversion mechanism needs to be further studied. In this work, we fabricate Cu-incorporated ZnO (Cu 25 Zn-A) on Zn plate for e-CO 2 RR catalyst by a facile annealing method. We find that Cu 25 Zn-A achieves a high CO Faraday efficiency > 90% with a CO yield rate of 0.49 mmol cm −2 h −1 . The improved catalytic activity on Cu 25 Zn-A is mainly attributed to the Cu steps on the reconstructed surface in the reaction: (1) that weakens the OH - /CO 3 2- adsorption, leading to the anti-poisoning surface by preventing the formation of Zn hydroxide/carbonates; and (2) that enhances the adsorption/activation of reactants and stabilizes the intermediates. Additionally, the density of defects in Zn oxide is increased by the Cu-incorporation, resulting in improved deoxygenation step. Our findings may provide insightful understanding on the mechanism and guide the design of novel electrocatalyst for effective CO 2 reduction.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2023
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IF 5.2
Jinyan Tan,Jinsong Wang,Jinlong Yang,Jie Wang,Taijiang Gui,Limin Wu,Shuxue Zhou
The current zwitterionic antifouling (AF) coatings generally have limited broad-spectrum AF ability, poor compatibility with coating matrixes and weak mechanical properties due to high water adsorption. In this work, we tried to incorporate zwitterionic component, namely, ( N -methoxyacylethyl)-3-aminopropyltriethoxysilane (MAPS) and ZnO nanoparticles into a moisture-curable polyacrylate (MCP) to fabricate marine AF coatings. AF behaviors were examined by laboratory and field assays towards different target foulants. Laboratory anti-protein ability towards bovine serum albumin promoted with the increase of MAPS and/or ZnO contents, verifying their synergistic AF effect towards the earliest pollutant in biofouling process. Laboratory AF test towards bacterium Pseudoalteromonas marina and diatom Cylindrotheca closterium also exhibited the synergistic AF effect between zwitterions and ZnO nanoparticles, however, depending on their concentrations. Under the highest contents of MAPS ( i.e., 30 %) and ZnO nanoparticles ( i.e., 50 %), the coatings showed the best laboratory AF properties, with the antibacterial rate, sterilization rate and anti-diatom rate of 86.7 %, 71.8 % and 87.6 %, respectively. As for the marine field AF performance, the ZnO nanoparticles content had a significant effect on improving the field antibacterial ability, while the effect of MAPS was not obvious. But for the field anti-diatom assay, MAPS and ZnO nanoparticles depicted synergistic effect on diatom resistance. After field exposure for 52 d, the coatings with 30 % MAPS and 50 % ZnO nanoparticles revealed the best comprehensive AF performance, i.e., 82.4 %, 95.0 % and 95.5 % reductions towards bacteria, diatoms and mussels, respectively, and moreover, maintained pencil hardness of 2 H after immersed in ASW for 9 months. Besides, the coatings were capable of restoring their original oleophobicity and AF capability after mechanical abrasion.
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PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE
·
2023
·Vol. 220
·期 5
·2200612
·
IF 2
Shuzuo Liu,Dongmei Yang,Yuxin Ren,Jiaming Song,Peng Hu,Yang Jiao,Haibo Fan,Feng Teng
Self-powered and flexible photodetectors exhibit great potential in the application of optical communication, deep space exploration, and other related fields. Herein, a self-powered ultraviolet photodetector based on ZnO nanowires/Te nanowires heterojunction has been prepared by two-step vacuum filtration method, which also has superior flexibility and fast response speed. The obtained photodetector has a high photocurrent (about 1 μA) at 5 V bias under 365 nm UV light illumination and a fast response speed (3.47/0.13 s). Even if the bending angle reaches 90°, its photocurrent still maintains about 0.5 μA under 5 V bias, showing superior flexibility. Under 0 V bias, the photocurrent of the photodetector is 0.18 nA and the response time is 65/140 ms, displaying its good self-powered characteristic and fast response speed. These superior properties are caused by the flexibility of ZnO nanowire film and Te nanowire film, and the heterojunction is formed between ZnO and Te. The obtained results provide a solid foundation for the further development of flexible optoelectronic devices based on ZnO nanostructures.
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 140
·期 5
·e53412
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IF 3.057
Xin Yang,Xiao Ma,Jingjing Yuan,Xia Feng,Yiping Zhao,Li Chen
Inorganic nanoparticles (NPs) have been employed in modification for polyvinyl chloride (PVC) membrane intrinsic hydrophobicity. Carboxymethyl chitosan (CMC), a natural organic matter, was used to relieve the agglomeration of zinc oxide (ZnO) NPs in the membrane matrix. In this paper, ZnO-CMC NPs were successfully prepared via co-precipitation approach, blended with PVC membranes, and the effect of ZnO-CMC NPs for the membrane properties was studied. The SEM and EDX confirmed excellent dispersion of ZnO-CMC NPs on the membrane surface. The enhanced hydrophilicity, porosity and inter-connected finger-like strcture of modified membranes confirmed by water contact angle and SEM. In addition, pure water flux of PVC/ZnO-CMC composite membrane was 107.36 L m −2 h −1 (PVC/ZnO-CMC (0.25 wt%)), which was higher than that of neat PVC membrane (83.11 L m −2 h −1 ). Importantly, the modified membranes exhibits lower static BSA adsorbtion because of the improved hydrophilicity, and a higher flux recovery rate (>90%) after three sequential filtration cycles. The antibacterial behavior of PVC/ZnO-CMC membrane was tested simply using Escherichia coli , and the results indicated that all composite membranes possess excellent antibacterial properties. Our work presents PVC/ZnO-CMC NPs composite membrane a promising future in wastewater treatment and antibacterial application.
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WATER RESEARCH
·
2023
·
IF 12.8
Qiang Liu,Xiaojun Niu,Dongqing Zhang,Xingyao Ye,Peibing Tan,Ting Shu,Zhang Lin
Phosphite, an essential component in the biogeochemical phosphorus cycle, may make significant contributions to the bioavailable phosphorus pool as well as water eutrophication. However, to date, the potential impacts of coexisting photochemically active substances on the environmental fate and transformation of phosphite in aquatic environments have been sparsely elucidated. In the present study, the effect of zinc oxide nanoparticles (ZnO NPs), a widely distributed photocatalyst in aquatic environments, on phosphite phototransformation under simulated solar irradiation was systematically investigated. The physicochemical characteristics of the pristine and reacted ZnO NPs were thoroughly characterized. The results showed that the presence of ZnO NPs induced the indirect phototransformation of phosphite to phosphate, and the reaction rate increased with increasing ZnO NPs concentration. Through experiments with quenching and trapping free radicals, it was proved that photogenerated reactive oxygen species (ROS), such as hydroxyl radical (•OH), superoxide anion (O 2 •− ), and singlet oxygen ( 1 O 2 ), made substantial contributions to phosphite phototransformation. In addition, the influencing factors such as initial phosphite concentration, pH, water matrixes (Cl − , F − , Br − , SO 4 2− , NO 3 − , NO 2 − , HCO 3 − , humic acid (HA) and citric acid (CA)) were investigated. The component of generated precipitates after the phosphite phototransformation induced by ZnO NPs was still dominated by ZnO NPs, while the presence of amorphous Zn 3 (PO 4 ) 2 was identified. This work explored ZnO NPs-mediated phosphite phototransformation processes, indicating that nanophotocatalysts released into aquatic environments such as ZnO NPs may function as photosensitizers to play a beneficial role in the transformation of phosphite to phosphate, thereby potentially mitigating the toxicity of phosphite to aquatic organisms while exacerbating eutrophication. The findings of this study provide a novel insight into the comprehensive assessment of the environmental fate, potential ecological risk, and biogeochemical behaviors of phosphite in natural aquatic environments under the condition of combined pollution.
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MATERIALS CHEMISTRY AND PHYSICS
·
2023
·
IF 4.6
Debin Zeng,Longtao Wang,Ruian Du,Zhen Wu,Xiting Wang,Chunguang Kuai,Yuzheng Guo,Changlin Yu
CO 2 photoreduction under mild conditions remains challenging, attributing to sluggish kinetics of complex coupling process of multi-electrons-protons and inefficient electron-hole pairs utilization. Herein, with Zn 3 V 2 O 8 as a phase transformation material, we construct an effective Zn 2 V 2 O 7 /Zn 3 V 2 O 8 /ZnO (OVZn) Z-scheme system by partial decomposition of Zn 3 V 2 O 8 into Zn 2 V 2 O 7 and ZnO. Time-resolved fluorescence decay (TRFD) spectra investigation shows that the photogenerated electrons of Zn 2 V 2 O 7 and ZnO recombine with the holes of Zn 3 V 2 O 8 , retaining more reductive electron of Zn 3 V 2 O 8 for CO 2 reduction. Moreover, in-situ Fourier-transform infrared spectroscopy suggests that the heterostructure can lower the energy barrier of CO desorption by changing bridge-bonded CO to linear-bonded CO and optimizing the energy barrier of CO production. Moreover, Cu, Ag and Au loading on OVZn greatly enhance light harvesting and promote photoelectric conversion, producing much photogenerated electron-hole pairs for CO 2 reduction. OVZn and metal loaded OVZn have better photocatalytic performance, showing application superiority on CO 2 photoreduction.
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PLASMA SCIENCE & TECHNOLOGY
·
2023
·Vol. 25
·期 10
·104004
·
IF 1.7
Qijun DUAN,Yanze SONG,Shuai SHAO,Guohua YIN,Haoou RUAN,Qing XIE
The surface flashover of epoxy resin (EP) composites is a pivotal problem in the field of high-voltage insulation. The regulation of the interface between the filler and matrix is an effective means to suppress flashover. In this work, nano ZnO was fluorinated and grafted using low-temperature plasma technology, and the fluorinated filler was doped into EP to study the DC surface flashover performance of the composite. The results show that plasma fluorination can effectively inhibit the agglomeration by grafting –CFx groups onto the surface of nano-ZnO particles. The fluorine-containing groups at the interface provide higher charge binding traps and enhance the insulation strength at the interface. At the same time, the interface bond cooperation caused by plasma treatment also promoted the accelerating effect of nano ZnO on charge dissipation. The two effects synergistically improve the surface flashover performance of epoxy composites. When the concentration of fluorinated ZnO filler is 20%, the flashover voltage has the highest increase, which is 31.52% higher than that of pure EP. In addition, fluorinated ZnO can effectively reduce the dielectric constant and dielectric loss of epoxy composites. The interface interaction mechanism was further analyzed using molecular dynamics simulation and density functional theory simulation.
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Advanced Optical Materials
·
2023
·
IF 9
Sisi Liu,Meng Wang,Xiong Yu,Hao Li,Haifei Lu,Xiaoyan Wen,Ming-Yu Li,Jianbing Zhang
Infrared (IR) solar cells are potential optoelectronic devices for boosting the power conversion efficiency (PCE) of conventional photovoltaics (such as pervoskite and silicon solar cells) by broadening the utilization range of the sunlight spectrum to short-wavelength infrared region. PbSe colloidal quantum dots (QDs) are one of the optimal candidates for IR solar cells because of their tunable bandgap in the IR region and flexible solution processibility. At present, the best PbSe QD IR photovoltaics generally adopt ZnO as an electron transport layer (ETL). However, the intrinsic drawbacks and surface defects of ZnO can potentially deteriorate the PCE of devices. Herein, Ti 3 C 2 T x , a representative 2D transition carbide, is combined with sol-gel ZnO to develop a new hybrid ETL for fabricating high-performance IR solar cells. This combination effectively suppresses the defects within ZnO by forming new bondings and simultaneously enhances the crystalline of ZnO film. Meanwhile, the introduction of Ti 3 C 2 T x into ZnO film accelerates the transport and collection of photo-generated carriers by constructing a new electron transport pathway. Consequently, compared to the bare devices, the infrared PCE of PbSe QD solar cells increases by 19.5% to 1.04%. These results demonstrate that this hybrid ETL can offer a bright approach for developing high-performance optoelectronic devices.
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International Journal of Electrochemical Science
·
2023
·
IF 1.5
Chaogang Zhou,Chaojin Zhou,Jiawei Zhang
The poly(o-phenylenediamine)-ZnO (PoPD-ZnO) composite were synthesized by in-situ polymerization, and the waterborne polyurethane was used as the binder. The corrosion inhibition performance of the PoPD-ZnO composite coating on stainless steel was investigated. The structures of homopolymer PoPD and PoPD-ZnO composite were characterized by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD) and scanning electron microscopy (SEM). Cyclic voltammetry demonstrates the redox properties and stability of the composite. After soaking in 3.5% NaCl for a certain period of time, the corrosion resistance of the polymer coating was studied by potentiodynamic polarization and electrochemical impedance spectroscopy (EIS). The results show that the homopolymer PoPD coating and the PoPD-ZnO composite coating can protect the stainless steel. The corrosion rate of the PoPD-ZnO composite coating with good corrosion resistance is 1.9% of bare steel. In addition, the addition of nano-ZnO facilitates the formation of a compact and low-defect coating, thereby impeding the erosion of corrosive media and improving the corrosion resistance of PoPD coatings.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2023
·
IF 8.2
Ying Li,Xiu-Er Luo,Ming-Jun Tan,Fu-Hao Yue,Run-Yu Yao,Xin-An Zeng,Meng-Wai Woo,Qing-Hui Wen,Zhong Han
In this study, a novel carboxymethylcellulose / ZnO / chitosan (CMC / ZnO / Cs) hydrogel microbeads loaded with crosslinked porous starch / curcumin (CPS / Cur) were designed and prepared to improve the encapsulation efficiency of curcumin for drug delivery to specific sites. It was found that the total pore volume of crosslinked porous starch (CPS) was increased by 1150 % when compared to the native starch (NS), and the adsorption ratio of curcumin by CPS was enhanced by 27 % when compared to NS. Secondly, the swelling ratio of composite hydrogel microbeads was within 25 % in an acidic environment at pH 1.2, and the swelling ratio of hydrogel microbeads sharply increased to 320 % ~ 370 % at pH 6.8 and 7.4. In addition, the results of in vitro simulated release experiments showed that the released amount of hydrogel microbeads loaded with NS/Cur and CPS/Cur in SGF were within 7 % in simulated gastric fluid (SGF). The highest released amount of curcumin was 65.26 % for hydrogel beads loaded with CPS/Cur, which was 26 % lower than that of hydrogel microbeads loaded with Cur in simulated intestinal fluid (SIF). In simulated colonic fluid (SCF), the released amount of hydrogel microbeads loaded with CPS/Cur and Cur were 73.96 % and 91.69 %, respectively. In conclusion, pH-sensitive drug delivery system with good drug stability and bioavailability were successfully prepared with carboxymethylcellulose / ZnO / chitosan bead, suitable targeting drug delivery to the small intestine .
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