INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2023
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IF 7.2
Xiao Xu,Yucheng Dong,Fangfang Liu,Hui Wang,Xuyun Wang,Xiaoyuan Li,Jianwei Ren,Rongfang Wang
Electrochemical urea electrolysis holds great potential for energy-efficient hydrogen production and wastewater treatment . However, developing cost-effective and highly active catalysts remains a challenge. In this study, a novel bifunctional electrocatalyst of Ni–Zn bimetallic nanosheets (ZnO–Ni 2 P) was synthesized on Ni foam (NF) for efficient urea decomposition in urea-containing wastewater. The results showed that inactive ZnO phase acted as an "electron pump", which facilitated electron redistribution between Ni and P atoms and created localized vacancies of Ni and P cations. This optimized electronic configuration enhanced the kinetics of both the urea oxidation reaction (UOR) and hydrogen evolution reaction (HER). Additionally, a unique particle-porous structure with abundant grain boundaries was achieved through the utilization of the Kirkendall Effect and Ostwald Ripening . In an alkaline urea electrolysis system , the alkaline urea electrolyzer assembled with ZnO–Ni 2 P/NF sample as both electrodes exhibited a low driving potential of only 1.424 V to achieve a current density of 10 mA cm −2 , which outperformed the commercial noble metal-based electrolyzer (RuO 2 ||Pt/C). The results verify that incorporating an inactive phase to manipulate the electronic structure of the active phase can be an effective strategy in developing catalysts for urea electrolysis.
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ADVANCED FUNCTIONAL MATERIALS
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2023
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IF 19
Mengqiu Huang,Lei Wang,Ke Pei,Bangxin Li,Wenbin You,Liting Yang,Gang Zhou,Jincang Zhang,Chongyun Liang,Renchao Che
Heterogeneous interface regulation plays an important role in tailoring the intrinsic electromagnetic (EM) properties for obtaining excellent EM wave absorption, which still faces huge challenge. In this work, bi-metal MOFs-derived ZnFe 2 O 4 –ZnO-Fe@C (ZZFC) microspheres with custom-built heterogeneous interfaces are successfully fabricated via a confined growth strategy. Bi-metal Fe–Zn–ZIF with tailored coordination structure and chemical bonding are first selected as the precursor template. After undergoing the annealing process, the metal Fe 2+ host is converted into magnetic Fe nanoparticles (NPs). The Zn 2+ host is transformed into semiconductor zinc oxide (ZnO) with increasing (101) crystal-oriented growth. At the same time, metal hosts Fe 2+ and Zn 2+ are further reacted to synthesize the zinc ferrite (ZnFe 2 O 4 ). Formed Fe nanoparticles catalyze organic ligands to constitute graphitized carbon layers, which confine the further growth of ZnFe 2 O 4 , ZnO, and Fe NPs. Combined with the well impendence and synergy absorption mechanism (magnetic loss, interface polarization, and conduction loss), optimized magnetic–dielectric ZnFe 2 O 4 –ZnO-Fe@C microspheres exhibit outstanding EM wave absorption with the minimum reflection loss −66.5 dB at only 2.0 mm thickness. Bi-metal MOF-derived magnetic–dielectric absorption materials with tailored heterogeneous interfaces provide a new sight to design an efficient EM wave absorption system.
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Journal of Environmental Chemical Engineering
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2023
·
IF 7.7
Wenqiang Liu,Meng Zhou,Heqing Fu
A ternary Ag@ZnO@Ti 3 C 2 MXene heterojunction (AZM) is synthesized by hybridizing ZnO and Ag nanoparticles with the MXene via a simple hydrothermal and chemical deposition method. The addition of ZnO and Ag can effectively compensate for MXene’s narrow bandgap property, promote charge carrier separation, and improve visible light absorption , thereby enhancing photocatalytic activity. The photocatalytic activity of the AZM is evaluated through the removal efficiency of methylene blue (MB) dye and levofloxacin (LVX) under visible light irradiation. The results show that the optimized ternary AZM heterojunction photocatalysts (AZM-15) possesses the maximum degradation of MB (90.54%) with a reaction rate constant of 0.0473 min −1 , while the maximum degradation of LVX (86.76%) has a reaction rate constant of 0.0408 min −1 . Moreover, the AZM composite exhibits excellent stability, which explains its MB removal rate of 83.59% and LVX removal rate of 80.03% after five cycles. The results of trapping experiments and EPR demonstrated that the main active species in the MB and LVX photodegradation process are·OH and·O 2 - . This work not only elucidates a possible mechanism of photocatalytic degradation of organic pollutants but also provides a pathway to design new bandgap photocatalysts for mitigating environmental pollution .
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CHEMICAL ENGINEERING JOURNAL
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2021
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IF 13.273
Bo Huang,Xiangmei Liu,Zhaoyang Li,Yufeng Zheng,Kelvin Wai Kwok Yeung,Zhenduo Cui,Yanqin Liang,Shengli Zhu,Shuilin Wu
Rapid bacteria killing and tissue repair are critical for the fast healing of bacteria-infected wounds, especially under poor sanitation without antibiotics. Herein, we prepared a novel xerogel constructed by thioether as a main chain and embedded by Ag nanoparticles (NPs) and ZnO NPs decorated by N-doped carbon dots (N-CD@ZnO). This hybrid xerogel not only has good mechanical properties without swelling but also has the ability to capture bacteria rapidly by the disulfide group through electrostatic interaction. Under 808 nm near-infrared (NIR) light irradiation for 15 min, this hybrid xerogel killed 99.9% Escherichia coli and 99.85% Staphylococcus aureus by the synergistic action of released Ag + and reactive oxygen species (ROS) produced by N-CD@ZnO using up-conversion technology (N-CD reduces the biotoxicity of ZnO and changes its photocatalytic response region from the 368 nm ultraviolet (UV) region to the 808 nm NIR region). In addition, the biotoxicity of Ag + is limited by the Ag-S covalent bond, which ensures good biocompatibility for the xerogel. Finally, in wound repair experiments in vivo , this xerogel is able to completely repair the wound within 10 days. This work will open up a new avenue for xerogel antibacterial materials.
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MICROCHEMICAL JOURNAL
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2020
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IF 3.594
Xizhuang Yue,Zaiyu Li,Shuang Zhao
A novel electrochemical sensor based on graphene (GR) and ZnO nanorods (GR-ZnO/GCE) was developed to detect sulfamethoxazole (SMX) and trimethoprim (TMP) simultaneously. SEM image showed that ZnO had a rod shaped morphology. XRD result indicated a hexagonal wurtzite phase of ZnO nanorods. The electrochemical experiment results showed that the synergetic effect of GR and ZnO endowed the prepared sensor excellent electrocatalytic behavior towards the oxidation of SMX and TMP. SMX and TMP were detected by DPV method at 0.85 V and 1.06 V, respectively. Under the optimal conditions, the GR-ZnO/GCE showed superior wide linear responses in concentration range of 1–220 μmol/L for SMX and 1–180 μmol/L for TMP with the limit of detection (LOD) of 0.4 μmol/L and 0.3 μmol/L, respectively. In addition, the sensor has good stability, good selectivity, anti-jamming ability and reproducibility. We tested SMX and TMP in lake water, tap water, urine and serum with recovery between 93.2% and 108%. The proposed sensor has a good application prospect in biomedicine and environmental protection.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2020
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IF 3.99
Guoli Xu,Zhi Zhang,Tao Li,Meiling Du,Yueping Guan,Chen Guo
In this study, a sea urchin-like Fe 3 O 4 /ZnO/ZnSe hierarchical heterostructured photocatalyst was successfully prepared via a convenient synthetic strategy and combined with a newly designed photocatalytic magnetically fixed bed reactor (PMFBR) to continuously photodegrade pollutants under simulated solar light irradiation. In the experiment, ZnO nanorods were first grafted onto the surfaces of hollow Fe 3 O 4 nanoparticles, and then ZnSe nanoparticles were uniformly distributed on the ZnO nanorods, the obtained Fe 3 O 4 /ZnO/ZnSe composite exhibited three-dimensional structure and excellent magnetic response. Through citing PMFBR, a stable and homogeneously distributed heterogeneous catalyst, efficient light distribution, and good mass transfer of reactants were achieved. As a result, the Fe 3 O 4 /ZnO/ZnSe composite in the PMFBR showed excellent photocatalytic capacity with a continuous process. The combination of the magnetic photocatalyst and PMFBR transformed the reaction mode from cumbersome intermittent operation to a simple continuous-flow photocatalytic style. It is hoped that this continuous photocatalytic system could provide a new idea for large-scale wastewater treatment.
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CRYSTENGCOMM
·
2021
·Vol. 23
·期 33
·5655-5662
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IF 3.545
Jianqi Yao,Xuzhao Li,Jing Lu,Qing Ma,Yongdong Liu,Faliang Luo
In this study, we synthesized a type of microcrystalline H-ZnOc with columnar structure by controlling the solubility of the reaction solution. Poly(ethylene 2,6-naphthalate) (PEN) and hexagonal zinc oxide column (H-ZnOc) composite materials were prepared by a twin screw extruder and the properties of the composites were characterized. The results showed that H-ZnOc has a remarkable nucleation effect on PEN, especially when the loading amount of H-ZnOc is 1.5 wt%; the nucleation efficiency is as high as 52.28%, and the crystallization temperature increased by nearly 23 °C. The crystal morphology changed, with the disappearance of the cold crystallization peak after the addition of H-ZnOc, the size of spherulites decreased and the number of spherulites increased. During the isothermal crystallization process, H-ZnOc significantly reduced the crystallization time of PEN. The impact strength of PEN increased from 1.86 kJ m−2 to 2.73 kJ m−2. Our results showed that H-ZnOc can be used as an effective nucleating agent for PEN, effectively improving the crystallization ability and mechanical properties, and its performance is comparable to the proprietary polymer nucleating agents NX8000, HPN68L, and TMB-5, etc.
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ACS Applied Polymer Materials
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2021
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IF 4.089
Bo Zhang,Tianze Liang,Xiaoming Shao,Ming Tian,Nanying Ning,Liqun Zhang,Wencai Wang
A method of nondestructive grafting of zinc oxide onto a fiber surface followed by silane grafting was demonstrated. We used tannic acid and polyethyleneimine to form functional surfaces onto aramid fibers, which can form chemical bonds with zinc oxide. Through in situ hydrothermal reductions, zinc oxide nanowires are uniformly grown onto aramid fibers. A polysulfide functionalized silane was then grafted, which can covulcanize with a rubber matrix. The interfacial adhesion between the modified fibers and rubber has an increase of 57.0%, compared with untreated aramid fibers, which demonstrated that the grafting of zinc oxide nanowires and the grafting of silane can play a combination effect on improving the interfacial adhesion. The results suggested that the growth process of zinc oxide nanowires has almost no effect on the breaking strength of aramid fibers.
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WATER RESEARCH
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2021
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IF 11.236
Baowei Zhang,Xiang Tang,Changzheng Fan,Wanle Hao,Yilin Zhao,Yanjing Zeng
The enrichment of zinc oxide nanoparticles (ZnO NPs) in waste activated sludge (WAS) has raised concerns about their potential impact on anaerobic digestion of WAS. To date, there is no information regarding how to attenuate the negative effects of ZnO NPs on WAS anaerobic digestion. In this study, it was found that the appropriate amount of cationic polyacrylamide (cPAM) could mitigate the toxicity of ZnO NPs. During short-term exposure, the supplement of 4.0 mg cPAM/g TSS significantly restored biochemical methane potential from 28.6% inhibition to 9.3% inhibition compared with the control digester ( P < 0.01). The spiked cPAM promoted the solubilization and acidification stages by weakening the contact between ZnO NPs and anaerobes in anaerobic digestion process, thus providing abundant substance for sequent bio-utilization. In the long-term semi-continues operated reactor, the continuous replacement of cPAM (at 4.0 mg/g TSS) significantly strengthened the recovery of VS destruction rate (20.3% to 26.4%, P < 0.01) and the daily yield of methane (93.5 mL/d to 124.2 mL/d, P < 0.01). Consistent with the restored performance, the application of cPAM increased the total microbial communities and the relative abundances of dominant acidogens and methanogens. Further explorations showed decreased toxicity of ZnO NPs primarily attributed to the decline of reactive oxygen species (ROS) induced by ZnO NPs.
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TALANTA
·
2019
·
IF 4.916
Shengrui Xu,Qingqing Liu,Cuicui Wang,Li Xiao,Suling Feng,Ning Li,Chang-Po Chen
In this study, facile fabrication of three-dimensional (3D) pompon-like gold/zinc oxide (Au/ZnO) porous microspheres by hydrothermal procedure was investigated. These microspheres were utilized as solid phase microextraction (SPME) coating for determination of volatile fatty acids (VFAs) from foot odor coupling with gas chromatography-mass spectrometry (GC-MS). SEM and TEM characterizations showed that as-prepared material was composed of 1D porous nanowires and presented a uniform coating on stainless-steel wire. The extraction of VFAs including propanoic acid, butyric acid , isobutanoic acid, isovaleric acid , hexanoic acid , and heptylic acid was carried out by headspace model after sampling from human foot using cotton wool strips. Following optimization of extraction parameters including extraction temperature and time and desorption temperature and time, the as-prepared SPME coating presented better extraction efficiency than commercial DVB/CAR/PDMS fiber towards all the VFAs due to its excellent properties. Under the optimized conditions, the method exhibited good linearity (0.5–200 ng) with regression coefficients (R 2 ) ranging from 0.9836 to 0.9981 for all the analytes. The limits of detection ranged from 0.017 to 0.098 ng. Single fiber repeatability varied from 6.5% to 11.2% and the fiber-to-fiber reproducibility ranged from 8.6% to 12.3%. The proposed method was successfully applied for extraction and determination of VFAs from foot odor after sampling using cotton wool strips.
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Food Analytical Methods
·
2019
·Vol. 12
·期 7
·1585-1593
·
IF 2.413
Gao Xue,Liu Yutong,Wang Yu,Zhang Qiang,Liu Xiuying,Tang Yiwei,Li Jiangrong
Hierarchical zinc oxide (ZnO) nanomaterials have been successfully synthesized using a biotemplated method. The morphology and structure of the produced samples were characterized by means of SEM, TEM, XRD, FTIR, etc. The result showed that hierarchical ZnO nanomaterial retained the porous network structure of the template. Trimethylamine (TMA) in aquatic products was effectively detected by a fluorescence resonance energy transfer (FRET)–based molecular sensor using ZnO as energy donors and tetrasodium-meso-tetra(4-sulfonatophenyl) porphine dodecahydrate (TPPS) as energy acceptors. The FRET efficiency was reduced by the addition of TMA, due to the combination between TPPS and TMA. The fluorescence intensity of ZnO (donor) would decrease gradually with the increasing concentration of TMA. Under the optimal conditions, a linear correlation was established between the fluorescence intensity ratio I TPPS / I ZnO and the concentration of TMA in the range of 2.67 × 10 −11 –6.67 × 10 −6 mol/L and 1.33 × 10 −5 –6.67 × 10 −4 mol/L with a detection limit of 7.51 × 10 −12 mol/L. The proposed method was successfully applied to the determination of TMA in real fish samples with satisfactory results.
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ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Hui Li,Shushu Chu,Qian Ma,Yuan Fang,Junpeng Wang,Quande Che,Gang Wang,Ping Yang
Morphology-tunable C–N/SnO2-based hierarchical microspheres with good gas sensitivity for triethylamine (TEA) have been fabricated via facile electrospinning and a subsequent calcination process. The reaction temperature and modifying calcining technology played a dominant role for the morphological evolution from precursor fibers to microspherical shapes and the formation of C–N-decorated SnO2 phase composition. C–N/SnO2/ZnO composites with tunable crystallinity, microstructure, and gas-sensing performance were strictly dependent on the added amount of Zn element. Fascinatingly, the constructed C–N/SnO2/ZnO/Au composites can not only precisely regulate the crystal size, dispersion status, loading position, and content of Au nanoparticles but also display excellent gas-sensing properties with ultrasensitivity and high selectivity under various temperature detections. The response of C–N/SnO2/ZnO/Au composites can reach up to approximately 1970, calculated to be 121.6 and 23.6 times for 50 ppm TEA molecules at optimal conditions compared with C–N/SnO2 and C–N/SnO2/ZnO microspheres, respectively, actually representing the highest response value at high temperatures reported to date. The superior long-aging stability of sensing behaviors and phase structures can be also observed after 1 month. More importantly, novel C–N/SnO2/ZnO/Au sensors were employed for availably detecting low-concentration volatiles released from the storage procedure of fishes at 80 °C, indicating the practical application in chemical detectors and biosensors at low temperature. The novel gas-sensing mechanisms derived primarily from the combination of phase compositions, morphologies, and unique surface/interface transfer processes of C–N/SnO2/ZnO/Au composites are presented and investigated in detail, which will contribute to the design and development of other semiconductor-based composite sensors.
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