SOLID STATE SCIENCES
·
2019
·
IF 2.155
Hu Jingyu,Yang Ran,Li Zhaohui,Sun Yuanqiang,Qu Lingbo,Alexander Nti Kani
The zinc oxide/graphitic carbon nitride (ZnO/g-C 3 N 4 ) heterostructured nanocomposite was successfully synthesized by a facile two-step process involving thermal condensation of melamine and hydrothermal in situ growth of globular zinc oxide (ZnO) nanoparticles on the surface of graphitic carbon nitride (g-C 3 N 4 ). The morphologies, chemical compositions, and optical properties of the prepared ZnO/g-C 3 N 4 were investigated via a series of characterization techniques. SEM and TEM validate the grafting of ZnO globular with a diameter of 40–50 nm on the surface of g-C 3 N 4 . The visible photodegradation activity of the nanocomposite was assessed via tetracycline and oxytetracycline as target pollutants. Under visible light irradiation, 15 wt% ZnO globular-g-C 3 N 4 exhibits high photocatalytic activity with 78.4% of tetracycline degraded in 50 min and 63.5% of oxytetracycline in 50 min which was much faster photocatalytic degradation efficiency than that of the reported materials. Reactive species scavenging experiments revealed that photogenerated holes are the main reason for the photocatalytic degradation. After six recycles, the ZnO globular-g-C 3 N 4 resulted in 70% degradation efficiency of TC suggesting its high stability and reusability. This work proved a new insight for constructing novel high-performance photocatalysts for TC degradation.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2017
·
IF 5.401
Yan Zhao,Jian Gong,Xiaobin Zhang,Rongmei Kong,Fengli Qu
Recently, photoelectrochemical (PEC) biosensing has received considerable attention with wide applications in biotechnology and biomedicine. Here we report a novel PEC biosensing platform constructed via the combined strategy of both PEC analysis and bioetching. Urchin-like ZnO-Au@CdS microspheres were obtained by depositing Au nanoparticles (NPs) and CdS NPs on the surface of urchin-like ZnO microspheres. The introduction of intermediate electrotransfer of Au NPs to isolated ZnO and CdS systems significantly enhances the PEC property. CdS NPs can be irreversibly bioetched by an enzymatic reaction catalyzed by horseradish peroxidase (HRP) and H 2 O 2 . As a result, H 2 O 2 detection is realized based on the decrease of the intensity of the PEC signal. This mediator-free and interference-free sensing platform has a linear range from 0.15 to 100 μM with a detection limit of 0.04 μM H 2 O 2 at S/N = 3. Furthermore, glucose oxidase (GOD) was successfully immobilized on ZnO-Au@CdS microspheres to construct a glucose biosensor with a detection limit of 0.18 μM at S/N = 3. The PEC biosensor shows good sensing performance with low detection limit, mediator-free and accuracy, strong anti-interference, promising its application in PEC biosensing.
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MATERIALS RESEARCH BULLETIN
·
2019
·
IF 3.355
Sefiu Abolaji Rasaki,Chunlei Zhao,Rui Wang,Jiacheng Wang,Heng Jiang,Minghui Yang
In this work, Ag/ZnO nanorods are prepared via simple and cost-saving liquid precipitation citrate reduction process (LPCR). The system shows appreciable catalytic activity for the reduction of 4-nitrophenol (4-NP) to 4-aminophenol (4-AP) wherein NaBH 4 is used as electron sacrificer at ambience. It is found out that ZnO nanorods can effectively prevent Ag NPs agglomeration; a problem normally reduces active sites density. The coupling effect between the Ag NPs and ZnO greatly enhances electron transfer rate. This gives rise to high reduction rate constant ( k app ) of ˜3.97 × 10 −3 s −1 for the catalytic reduction of 4-NP. The result is about 1.9times better than that of Ag NPs (2.07 × 10 −3 s −1 ). The k app is well fitted into pseudo-first order kinetics with high correlation coefficient (R 2 ) of about 0.994, indicating chemisorptive reduction process. The remarkable performance obtained here is attributed to strong coupling effect between Ag NPs and ZnO nanorods derived from LPCR synthesis method.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2017
·
IF 6.216
Jiajie Yu,Dongping Sun,Tianhe Wang,Feng Li
Conventional ZnO powder catalysts possess excellent stability and photocatalytic activity, but have great difficulties for separation and regeneration after the reaction and require ultraviolet irradiation (less than 5% of solar energy), thus restricting practical applications. In this paper, unique short submicron wire-like ZnO films were successfully prepared on silicate glass substrates by calcination of spin-coated zinc acetate solution in the presence of ethanolamine (EA). A typical synthesis yields ZnO submicron wires with ca. 50–120 nm in diameter, 15–30 μm in length and 0.5–1.5 μm in height. Ag@AgCl particles were deposited on short ZnO submicron wire films by a simple impregnating-precipitation-photoreduction method. The as-prepared Ag@AgCl/ZnO film exhibited efficient photocatalytic performance under visible light irradiation and excellent self-cleaning capability under solar light. This film photocatalysts were easy to separate from the reaction, and the tests showed that the films were reusable for four times without significantly loosing efficiency. Additionally, gas chromatography–mass spectroscopy (GC–MS) was applied to investigate the degraded chemical species resulted from the photo-catalytic degradation of methylene blue (MB) and methyl orange (MO) dyes under Ag@AgCl/ZnO. A possible photocatalytic mechanism was proposed based on the photoelectrochemical measurements and radical trapping experiments.
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Journal of Materials Chemistry A
·
2014
·Vol. 2
·期 47
·20307-20315
·
IF 0
Fan Wu,Yilu Xia,Yuan Wang,Mingyang Wang
Graphene oxide (GO) and zinc oxide (ZnO) nanoparticles have formed a three-dimensional (3D) nanocomposite through a hydrothermal process, and further UV-irradiation removed the remaining oxygen functional groups from the skeleton of the reduced graphene oxide (RGO). This new type of 3D-RGO/ZnO nanocomposite exhibits a wide and effective absorption bandwidth (deeper than −10 dB), which was characterized as 6.4 GHz when the filler loading is 10 wt% in the composite and the thickness of the absorber is 2.5 mm. Therefore, combining the GO and ZnO nanoparticles into a 3D nanocomposite can be considered as an effective route to design a light weight and high performance electromagnetic absorption material.
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Materials
·
2018
·Vol. 11
·期 9
·1761
·
IF 2.467
Liaojun Wan,Fuchao He,Yu Qin,Zhenhua Lin,Jie Su,Jingjing Chang,Yue Hao
This paper reports low temperature solution processed ZnO thin film transistors (TFTs), and the effects of interfacial passivation of a 4-chlorobenzoic acid (PCBA) layer on device performance. It was found that the ZnO TFTs with PCBA interfacial modification layers exhibited a higher electron mobility of 4.50 cm2V−1s−1compared to the pristine ZnO TFTs with a charge carrier mobility of 2.70 cm2V−1s−1. Moreover, the ZnO TFTs with interfacial modification layers could significantly improve device shelf-life stability and bias stress stability compared to the pristine ZnO TFTs. Most importantly, interfacial modification layers could also decrease the contact potential barrier between the source/drain electrodes and the ZnO films when using high work-function metals such as Ag and Au. These results indicate that high performance TFTs can be obtained with a low temperature solution process with interfacial modification layers, which strongly implies further potential for their applications.Keywords:ZnO thin film transistors;solution process;interfacial modification layers;stability;contact potential barrier
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RSC Advances
·
2020
·Vol. 10
·期 57
·34381-34386
·
IF 3.119
Lele Chen,Jinghao Tian,Huaxing Song,Zhaohua Gao,Haisheng Wei,Wenhua Wang,Wanzhong Ren
Hydroformylation of olefins is one of the most important industrial processes for aldehyde production. Therein, the leaching of active metals for heterogeneous catalysts is an important issue in the hydroformylation reaction, particularly for higher olefins to produce higher alcohols. Here, different Rh/ZnO catalysts with diverse ZnO as a support were investigated and a home-made ZnO50 support was selected to prepare the Rh/ZnO50@ZIF-8 core–shell structure catalyst, which was synthesized by the growth of ZIF-8 with ZnO50 as the sacrificed template to afford Zn source. Compared with the Rh/ZnO50 catalyst, the Rh/ZnO50@ZIF-8 catalyst demonstrated a better cyclic stability in the hydroformylation of 1-dodecene. Combining the experiment and characterization results, it was concluded that the ZIF-8 shell on the Rh/ZnO50 catalyst effectively prevented the leaching of metal Rh into the reaction solution. Moreover, the Rh/ZnO50@ZIF-8 catalyst exhibited good universality for other higher olefins. This work provides a useful guideline for immobilizing the active species in heterogeneous catalysts for the hydroformylation reaction.
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PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2016
·
IF 3.15
Fang Wang,Xianhong Zhang,Le Yang,Dehong Xu,Yuhong Ma,Dong Chen,Li Wang,Changwen Zhao,Wantai Yang
A composite of a core–shell structured nanowires with ZnO as a core and conductive poly(3,4-ethylenedioxythiophene) (PEDOT) as a shell was prepared. At first, the hexagonal ZnO nanowires, with diameter of about 80–100 nm and length 4–5 μm, were fabricated by hydrothermal synthesis process. Then a thick layer of poly(trifluoroethyl methacrylate)- block -poly(sodium styrene sulfonate) (PTFEMA- b -PSSNa) was grafted from the surface of ZnO nanowires via atom transfer free radical polymerization. At last, with the ZnO@PTFEMA- b -PSSNa as a template and the PSSNa chain as the counterion dopant, PEDOT was precipitated onto the surface of the template to form the composite of ZnO@PEDOT/PSSNa. With the evaluation of the EDOT polymerization, the thickness of the PEDOT layer increased steadily. However, as the ratio of EDOT/ZnO was greater than 1:2, the ZnO nanowires templates were dissolved at last and then PEDOT particles were produced due to increasing of the acidity during the oxidation polymerization of EDOT. In this case, the product was the mixture of the nanotubes and particles of PEDOT/PPSNa. The electrochemical capacitances of the composites with different structures were investigated with cyclic voltammetry, galvanostatic charge–discharge and electrochemical impedance spectroscopy techniques with three-electrode cell configuration. The maximum specific capacitance of ZnO@PEDOT electrode can reach 101.34 F/g at 20 mV/s.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
·
IF 5.4
Yuanyuan Lu,Guangli Chen,Yuxuan Zhang,Wenjun Lv,Kangwei Zhang,Zaosheng Lv,Yanfen Huang
Superhydrophobic surfaces are important in research and technology because of their extraordinary qualities, such as water repellency, self-cleaning ability, and anti-biofouling performance. However, their production frequently relies on complicated and dangerous chemicals, which are incompatible with sustainable development objectives. We expected that integrating bio-derived chitosan (CS) with Zinc Oxide (ZnO) and altering it with low-surface-energy polymers-ODA/PDMS-OH (Octadecylamine/Hydroxy-Terminated Polydimethylsiloxane) would result in an environmentally friendly, resilient, and multifunctional superhydrophobic coating. This technique attempted to integrate micro/nano-structuring with chemical alteration of cotton fabric. The results show that the modified fabric has exceptional superhydrophobicity, with a water contact angle (WCA) of 159.8° and a sliding angle (SA) of 6.9°. The superhydrophobic surface has exceptional mechanical resilience, retaining hydrophobicity after tape peeling, sandpaper abrasion, and washing cycles. Furthermore, the coating exhibits considerable rebound recovery following plasma etching. Although air permeability was slightly reduced, the treated fabric met the comfort requirements for wearable applications while demonstrating superior ultraviolet (UV) resistance, antibacterial activity, self-cleaning performance, and oil-water separation capability, indicating promising practical utility. As a result, this study presents a long-lasting, fluorine-free, and scalable technique for producing multifunctional fabrics that bridges the gap between high performance and environmental sustainability.
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高影响因子
Environmental Progress & Sustainable Energy
·
2025
·
IF 2.3
Liu Yingyao,Xie Wenxin,Cao Duanchao,Chen Gang,Wang Qinwen
Pulping and papermaking black liquor (BL), predominantly produced during the cooking stage of the kraft or soda pulping processes, contains large amounts of organic and inorganic pollutants including lignin, hemicellulose, sodium hydroxide (NaOH), and sodium sulfide (Na 2 S). Direct discharge of this BL into the environment can cause severe ecological harm. Traditional alkali recovery processes used for pulping BL not only require significant financial investment but also fail to achieve high-value utilization of resources such as lignin. In the present study, PANI-ZnO particles were first successfully synthesized using the sol–gel method. These particles were then incorporated as fillers to fabricate PANI-ZnO/PES mixed matrix membranes using the non-solvent-induced phase separation (NIPS) technique. In the filtration test with pulping BL, the membrane containing 0.4% PANI-ZnO obtained the highest flux (1.17 L·m −2 ·h −1 ) and alkali recovery rate (85.71%), while the membrane containing 0.2% PANI-ZnO showed the highest sensitivity to lignin (58.78%) and hemicellulose (28.81%). Although MMM has been used in water treatment, it is still a challenge to use it exclusively in the harsh pulping black liquor treatment environment. In this study, MMM containing PANI-ZnO was designed specifically, and the synergistic effect was used to tolerate the high alkalinity and high organic load of black liquor. At the same time, lignin macromolecules were efficiently intercepted, and the extremely high alkali recovery rate was given priority, which was directly aimed at the core economic demand of black liquor resource recovery, which was significantly different from the traditional research path that only pursued interception rate or flux.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Lina Dai,He Wang,Yanduo Liu,Liru Cui
Direct light-driven methane selective conversion into useful chemicals remains a major challenge due to the need for photocatalysts with high photoactivity and selectivity in activating inert C-H bonds. In this study, we have developed highly photoactivity and selective photocatalytic CH 4 oxidation into C 2 H 6 using Ag-Mg tandem sites co-modified ultrathin ZnO hybrid photocatalysts in a flow reactor. Our system achieves an C 2 H 6 production rate of over 1860 μmol/g/h with 93 % selectivity, which is significantly higher than the efficiency of state-of-the-art photocatalytic systems. Various in-situ characterizations and theoretical studies reveal that the Ag-Mg tandem sites co-modified leads to enhanced photogenerated charge separation efficiency, while maintaining high ethane production rate owing to the strong selective adsorption capacity for methane and oxygen of the doped Mg sites and oxygen vacancy. Furthermore, the Ag nanoparticles cocatalyst can facilitate the removal of activated CH 4 in the form of methyl radicals in the gas phase, thereby promoting C 2 H 6 formation and inhibiting CH 4 overoxidation to produce CO 2 . Overall, these findings provide novel insights into the photocatalytic conversion of CH 4 on Ag/Mg-ZnO. These results offer valuable possibilities for developing more effective catalysts for the conversion of CH 4 to higher value-added products.
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高影响因子
ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Yoann de Rancourt de Mimérand,Kun Li,Cong Zhou,Xiaoyun Jin,Xiaoxian Hu,Yufei Chen,Jia Guo
Inorganic photocatalysts became an essential and powerful tool for the remediation of polluted water. However, important limitations of photocatalysts in their colloidal form, especially nanosized, remain. For instance, their separation from water after use and recovery, which can be particularly demanding, time- and energy-wise. Considering such aspects, supported catalysts bear significant advantages. However, efforts still have to be made to develop processes that allow the permanent and efficient immobilization of inorganic photocatalysts in sustainable conditions, in order to maintain the advantages of supported catalysts over colloidal ones. Herein, we report the use of an aqueous-phase plasma-aided grafting (APPAG) process to produce functional and efficient hybrid photocatalysts. More specifically, based on cold plasma discharge (CPD), ZnO/Bi2MoO6 heterojunctions were permanently immobilized on polymer supports generated by 3D-printing, with fractal-inspired designs. Three different approaches of the APPAG process have been successfully used for the immobilization of the inorganic phase, that is core–shell-assisted direct grafting, indirect grafting and in situ complexation-assisted precipitation (ISCAP). Noticeably, the latter technique has never been reported before to our knowledge. These three immobilization routes rely on different strategies and yield to distinct morphological specificities, but all allow using mild synthesis conditions and producing stable, active, permanently immobilized coatings of photocatalysts. Regarding the preparation of the organic supports, two sorts of additive manufacturing (AM) technologies were employed, namely fused-deposition modeling (FDM) and liquid crystal diode (LCD)-based SLA (stereolithography). The use of fractal geometries combined with AM permits the production of supports with relatively high surface areas, in a single processing step. Overall, the three plasma-based immobilization methods revealed to be efficient and the performance of the different hybrid photocatalysts have later been assessed through the photodegradation of Rhodamine B dye under simulated sunlight irradiation and visible light only, with promising results.
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