ACS Applied Materials & Interfaces
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2020
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IF 8.758
Yuze Wang,Ruoyu Xu,Liwei Chen,Chongbei Wu,Lili Qiu,Christopher D. Windle,Qing Han,Liangti Qu
A hierarchical architecture composed of nitrogen (N)-rich carbon@graphitic carbon-coated ZnO nanowire arrays on a graphene fiber (ZnO@C/GF) was fabricated by direct growth of a ZnO@zeolitic imidazolate framework-8 (ZIF-8) core–shell nanowire array on a GF followed by annealing and used as a microelectrode for detection of 2,4,6-trinitrotoluene (TNT). In such a design, ZnO accumulated TNT through a strong nitroxide–zinc interaction and ZIF-8 served as the precursor of the N-rich carbon@graphitic carbon layer that seamlessly connected ZnO with the GF to improve the poor conductivity of ZnO, thus enhancing the sensitivity of the ZnO@C/GF microelectrode. The constructed hierarchical hybrid fiber microsensor exhibited a wide linear response to TNT in a concentration range of 0.1–32.2 μM with a low detection limit of 3.3 nM. This ZnO@C/GF microelectrode was further successfully applied to the detection of TNT in lake and tap water, indicating its promise as a portable sensor for the electrochemical detection of explosive compounds.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2021
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IF 6.953
Min Wu,Zhilong Zhou,Jian Yang,Meng Zhang,Feng Cai,Peng Lu
The growth and reproduction of microorganisms can cause food spoilage in the process of food transportation and storage. Active packaging is a good way to inhibit food spoilage and prolong the shelf lives of foods. In this study, O/W Pickering emulsion with ZnO nanoparticles as solid particles and oregano essential oil as the oil phase was prepared and used to functionalize cellulose nanofibrils (CNFs) film, and excellent antimicrobial and antioxidant activity was obtained. When the concentration of ZnO nanoparticles was 1.5 wt% and the mass fraction of the oil phase was 20%, the Pickering emulsion with a particle size of 26.85 μm exhibited strong standing stability. The Pickering emulsion was blended with the film-forming matrix CNFs to prepare active packaging films by casting. The Pickering emulsion evenly dispersed in the film to form microcapsules which encapsulated oregano essential oil entirely. The antimicrobial activity against Listeria monocytogenes was 89.61%, the DPPH radical scavenging rate was 58.52%, while the barrier properties of the developed films against oxygen, water vapor and visible light were improved. The active CNFs film prepared by Pickering emulsion could inhibit the growth of microorganism and prolong the shelf lives of foods.
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Applied Nanoscience
·
2021
·Vol. 13
·期 2
·1495-1506
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IF 3.674
Zhang Xian-bing,Hu Ya-ping,Yang Wei,Feng Ming-bao
For the efficient disposal of organic pollutants and Escherichia coli ( E. coli ) in water, Ag-loaded and Pd-loaded ZnO nanofibers (NFs) were prepared through electrospinning (e-spin), followed by the alcohol-thermal method. The NFs were prepared in membrane form to promote their separation, recovery, and reuse in practical applications. The complete decolorizations of three types of dyes (i.e., azo, triarylmethane, and heterocyclic dyes) were observed when the Ag-loaded or Pd-loaded ZnO nanofiber membrane (NFM) was first applied as photocatalyst under 30-min UV irradiation. The characterization of the catalysts and the decolorization performance of dyes both demonstrated that the optimal loading rates of Ag and Pd were 12% and 6%, respectively. Moreover, the 12%-Ag/ZnO NFM displayed excellent recyclability over five cycles than the 6%-Pd/ZnO NFM. The E. coli disinfection test demonstrated that the photocatalytic inactivation rates with the 12%-Pd/ZnO NFM and the 6%-Ag/ZnO NFM were significantly improved under solar or UV irradiation, and hydroxyl radicals (∙OH) was primarily responsible for the antibacterial performance. Therefore, the presented 12%-Ag/ZnO NFM and 6%-Pd/ZnO NFM can be used for the efficient photocatalytic treatment of dyes and E. coli in water.
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SENSORS AND ACTUATORS B-CHEMICAL
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2019
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IF 6.393
Xiao Chang,Xiaofang Li,Xurong Qiao,Kun Li,Ya Xiong,Xiao Li,Tianchao Guo,Lei Zhu,Qingzhong Xue
It is imperative to explore an accurate ppb-level acetone sensor for noninvasive detection of diabetes. In this work, two dimensional p-type MoS 2 nanosheets are introduced on the surface of p-type ZnO derived from metal-organic frameworks (MOFs) to produce ZnO@MoS 2 core/shell heterojunctions as a novel acetone sensor, showing a great enhancement of acetone response, about two orders of magnitude than that of pure ZnO derived from MOFs. For example, the ZnO@MoS 2 exhibits about 80 times enhancement in response to 100 ppb acetone than that of pure ZnO. More importantly, this ZnO@MoS 2 heterojunctions sensor exhibits an ultra-fast response/recovery to ultra-low concentration acetone (60 s/40 s @ 5 ppb), which is the best acetone sensing performance for the metal oxide-based materials reported to date. Moreover, the acetone sensing performances are negligibly affected by humidity and other gas, which is suitable for exhaled acetone detection. Finally, it is elucidated that the sharp increase of negative heterojunction interface resistance, ultra-fast gas diffusion rates in MoS 2 nanosheets and strong interaction energy are key factors for the excellent acetone sensing properties of ZnO@MoS 2 . This work opens up a novel and efficient way for ultra-low concentration gas detection.
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Journal of Inorganic and Organometallic Polymers and Materials
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2019
·Vol. 30
·期 5
·1589-1599
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IF 1.637
Zhao Peng,Zhang Jinteng,Jiang Jingjing,Wang Hongtao,Xie Tengfeng,Lin Yanhong
A novel Pt/CeO 2 /ZnO ternary composite is synthesized via two simple procedures of hydrothermal and photoreduction. The crystal structure, morphology, and composition of as-prepared samples are characterized by XRD, SEM, HRTEM, XPS and UV–Vis DRS. Because both ZnO and CeO 2 are good photocatalytic semiconductors, photocatalytic activities of the samples are evaluated by the degradation of phenol aqueous solution (25 mg/L). Under the strong interaction among the Pt, CeO 2 and ZnO, the maximum photocatalytic activity is observed in the Pt/CeO 2 /ZnO ternary composites and 91% phenol can be degraded in 60 min under UV light irradiation. The probable photocatalytic mechanism is discussed by active species trapping experiments along with SPV, TPV, PL and PA measurements. The enhanced photocatalytic activity is attributed to the redox cycle of Ce 4+ ↔ Ce 3+ , the effective interface between ZnO and CeO 2 as well as the electron transfer action of Pt nanoparticles. The photocatalytic activity almost unchanged after four cycles and proves excellent reusable photocatalysts. This work shows the synergistic effect of rare earth elements and noble metals in the photocatalytic process, which facilitates their practical application in toxic pollution abatement.
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LANGMUIR
·
2019
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IF 3.683
Jie Chen,Yan Xiong,Ming Duan,Xiang Li,Jun Li,Shenwen Fang,Sha Qin,Run Zhang
The adsorption of dye molecules is an important process for the photodegradation removal of dye pollutants. In this work, a semiconductor photocatalyst of Cr-doped ZnO nanorods (Cr–ZnO NRs) was synthesized, and its adsorption–photocatalysis synergy (APS) effect was investigated for anionic methyl orange (MO–) and cationic methylene blue (MB+). The detailed thermodynamic information (including adsorption maximum capacity qmax, adsorption equilibrium constant Kads and adsorption efficiency AE %) and dynamic information (including adsorption rate constant ka, degradation rate constant kd and degradation efficiency DE %) were obtained to evaluate the different reaction performances for MO– and MB+. With qmax(MB+) = 40.59 mg g–1 > qmax(MO–) = 15.95 mg g–1, ka(MB+) = 20.61 min–1 > ka(MO–) = 4.62 min–1, and AE(MB+) = 40% > AE(MO–) = 9%, Cr–ZnO NRs showed much superior adsorption performance for MB+ than MO–. With kd (MB+) = 0.0430 min–1 > kd (MO–) = 0.0014 min–1 and DE(MB+) = 98% > AE(MO–) = 20%, Cr–ZnO NRs also showed much superior photodegradation performance for MB+ than MO–. The APS mechanism of Cr–ZnO NRs is revealed to be multiple π–π interactions and stronger electrostatic attractions dominant for enhanced adsorption of MB+ and higher AE and more photocatalytic active species dominant for enhanced photodegradation of MB+. The APS was furthermore characterized and verified by zeta potential analysis, Fourier transform infrared investigation, and fluorescence imaging. The results indicate that Cr–ZnO NRs are promising adsorbent and photocatalyst candidates favorable for positive MB+ than negative MO–. Such an APS investigation can effectively help to improve the photodegradation treatment performance of photocatalysts for dye pollutant removal.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
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2019
·Vol. 26
·期 23
·24062-24074
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IF 2.914
Xu Sheng,Jiang Xinde,Liu Lingli,Wang Zhenxi,Zhang Xiaohang,Peng Yong,Cao Meng
Polyvinyl alcohol (PVA) filled with different kinds of ZnO whisker was prepared by chemical cross-linking reaction. It was found that the ZnO whiskers dispersed uniformly after being modified by 3-aminopropyltriethoxysilane (APTES). The PVA/tetrapod-shaped ZnO (PVA/tetra-ZnO) composites showed better adsorption performance than other kinds of PVA/ZnO composites. The framework-supported pore-channel structure was beneficial for the transmission and adsorption of heavy metal ions, and the formation of “brush” pore-channel of PVA/tetra-ZnO composites can effectively retain and capture the heavy metal ions. The PVA/tetra-ZnO composites presented well adsorption on Pb(II), Cd(II), and Cr(III) ions than Ni(II) and showed relatively selective removal on Pb(II) and Cr(III) ions. The adsorbed heavy metal ions presented gradient distribution with high content in the out layer and low content in the inner layer. Pb(II) adsorption capacity q e increased gradually with the increase of initial solution concentration and contact time which tended to be stable at 400 mg/L and 800 min. The maximal adsorption capacity q m obtained by nonlinear fitting reached to about 116 mg/g which was very close to the experiment data. Adsorption isotherm results indicated the monolayer adsorption process of the Langmuir model and the adsorption kinetics data fitted well to the pseudo-second-order model. The adsorption process was spontaneous and the high temperature was in favor of adsorption. The adsorption mechanism was explored as the combination of coordination and ion exchange. Besides, the PVA/tetra-ZnO composites exhibited better stress stability, thermo stability, and favorable regeneration than neat PVA.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2019
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IF 4.084
Xiaorong Zhang,Muhammad Shakeel,Baoshan Li,Muhammad Arif,Xianglong Kong,Jianjun Liu,Shengli Zuo
The present study is about the fabrication of an efficient photo-/electrocatalyst, prepared via in-situ hydrothermal coupling of ZnO with g-C 3 N 4 . The results prove this electrocatalyst as suitable band structure semiconductor. The crystalline nature and related morphological parameters are controlled by optimized hydrothermal and calcination temperatures conditions. A series of physicochemical characterization are applied to inquire the crystalline structure, surface morphology , optical capabilities and charge transportation properties. Results revealed that the sample acts as excellent electrocatalyst with OER current density at 10 mAcm −2 @ 335 mV and the HER at 100 mAcm −2 @ −225 mV. While upon illuminations its catalytic properties further enhance at OER 10 mAcm −2 @ 326 mV and for HER current density of 100 mAcm −2 @ −167 mV. It can be seen from the present study that g-C 3 N 4 play gigantic role in enhancing the catalytic property of ZnO and hence it leads to a relationship between hierarchical features and photo-/electrochemical activity for water splitting.
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NEW JOURNAL OF CHEMISTRY
·
2019
·Vol. 43
·期 48
·19223-19231
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IF 3.069
Yingying Lv,Jiayu Lin,Siyan Peng,Laijun Zhang,Leshu Yu
The practical application of ZnO nanopowders (NPs) in purifying wastewater could be determined by some issues, such as low-cost and scalable preparation, high photocatalytic activity, antiphotocorrosion, and convenient recycling. In this contribution, a series of ZnO NPs were prepared in a scalable way in the 220 °C, 250 °C and 280 °C autoclaves, respectively. The structural, morphological and surface details of the samples were systematically examined by XRD, SEM, FT-IR, TEM, Raman, PL, and UV-visible spectroscopy. Along with the increase of the reaction temperature, the mean diameter of ZnO NPs increased in the range of 110–130 nm, and the color of the products was lighter, resulting in a smaller surface area but a stronger UV absorbance in the region of 200–400 nm. Moreover, the preferential growth along the (002) plane, the crystalline degree and the green emission intensity of ZnO 280 are more overt than those of ZnO 250 and ZnO 220. Some other parameters including stretching vibration and E2(high) mode of Zn–O bonding or diffraction peaks of ZnO 280 also shifted to lower wavenumbers or lower angles when compared to those of ZnO 220, revealing the existence of more oxygen vacancies in ZnO 280. As expected, ZnO 280 showed the best photocatalytic activity and antiphotocorrosion among the three samples in the degradation of rhodamine B due to the availability of abundant oxygen vacancies, preferential growth along the (002) direction and the high crystalline degree. This suggests that, along with the increase of the preparation temperature, the obtained ZnO nanopowders exhibit better photocatalytic activity. Therefore this work could provide a route to synthesize well crystalline ZnO nanopowders and open up an avenue for commercial applications of ZnO NPs in the treatment of organic wastewater.
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Journal of Materials Chemistry C
·
2018
·Vol. 6
·期 19
·5113-5121
·
IF 5.976
Zehao Song,Hai Zhou,Pengbin Gui,Xiaohan Yang,Ronghuan Liu,Guokun Ma,Hao Wang,Guojia Fang
Self-powered light-emitting photodetectors (SLEPs) can simultaneously transmit and receive information using light, offering huge potential for applications in interactive communication systems. However, high-performance SLEPs are very hard to achieve due to the seriously contradictory principles of carrier transport in SLEPs. In this study, a novel structure based on a ZnO hollow ball/CsPbBr3 heterojunction, in which ZnO hollow balls function as an ultraviolet (UV) response center and CsPbBr3 is designed to be a green light-emitting material, is reported as a high-performance SLEP. Since the ZnO hollow balls have superior light trapping characteristics for UV light, the device shows a huge UV response with the on/off ratio and detectivity up to 16 527 and 2.4 × 1013 Jones, respectively. Moreover, it displays blue emission with a low threshold voltage because of CsPbBr3. Compared with the traditional ZnO/GaN structure devices, the device showed enhanced dual-functional performance at various wavelengths due to the insertion of CsPbBr3, which resulted in a better contact interface and green-light emission center. Our structure separating the light-responsive and emitting active regions avoids the contradictory principles of carrier transport, which may provide new access to gain high-performance dual-functional devices.
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JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
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2018
·
IF 2.891
Xing Du,Weixin Li,Lei Zhao,Xuan He,Hui Chen,Wei Fang
A facile in-situ modification of photoanode is proposed to construct a unique hierarchical TiO 2 /ZnO structure with the aim at suppressing charge recombination rate and enhancing light harvest efficiency. Foam is not only employed as the soft template to fabricate hierarchical porous TiO 2 films but also as the carrier to realize in-situ growth of one dimensional ZnO nanowires among the TiO 2 nanoparticles. The results revealed that the hierarchical porous TiO 2 nanoparticles could provide both large surface areas and suitable porosity for the loading of quantum dots. In the meantime, ZnO nanowire can act as scattering centers for light absorption and offer direct pathways for electron transportation, thus decreasing the undesired charge recombination process. Consequently, the novel ZnO nanowires in-situ modified hierarchical porous TiO 2 photoanode are used as photoanode material to boost the performances of CdSe sensitized solar cells by virtue of controlling the moderate growth of ZnO nanowires. As a result, a power conversion efficiency of 3.07% is obtained based on this modified photoanode, which manifests 39.5% improvement compared to that of the cells based on bare TiO 2 hierarchical porous films (2.20%) due to the improved interconnections between TiO 2 nanoparticles and FTO substrate caused by ZnO nanowires.
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ORGANIC ELECTRONICS
·
2018
·
IF 3.68
Xinxin Huang,Huangzhong Yu,Shengwei Shi,Chengwen Huang
A novel ternary hybrid material zinc oxide & polyethyleneimine ethoxylated: reduced graphene oxide (ZnO&PEIE:RGO) is fabricated, and then used as electron transport layer (ETL) to improve the performance of inverted polymer solar cells (iPSCs). Compared with the pure ZnO as ETL, the power conversion efficiency (PCE) of iPSCs based on P3HT:PCBM blend system with ZnO&PEIE:RGO as ETL is efficiently improved from 3.00% to 3.83%. The addition of RGO increases the conductivity of ZnO, and the addition of PEIE not only passivates the surface of ZnO nanoparticles to reduce its surface defects , but also prevents the aggregation of the precursor dispersion of ZnO:RGO. Moreover, the performance of the PTB7:PCBM based iPSCs with ZnO&PEIE:RGO as ETL is also improved from 6.91% to 8.87% compared with that of the device with pure ZnO as ETL. Interestingly, devices with ZnO&PEIE:RGO also exhibit enhanced lifetimes devices with ZnO, which still retain up to 63% of their original PCE after stored for 30 days without any encapsulation in air. Consequently, this novel ternary hybrid material ZnO&PEIE:RGO is a promising ETL material for PSCs.
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