SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Fuzhen Liu,Xue Wang,Zhengzhi Liu,Fei Miao,Yin Xu,Hui Zhang
Zinc oxide supported on granular activated carbon (ZnO-GAC) was synthesized for the photocatalysis of Reactive Black 5 (RB5) with the presence of peroxymonosulfate (PMS). RB5 removal was improved with increasing temperature and dosage of PMS or catalyst, but declined with increasing pH and RB5 concentration. The reaction followed first-order kinetic model and the activation energy was determined to be 16.15 kJ mol −1 . After 60 min treatment, 43.6% of TOC was removed and further extending the reaction time to 90 min resulted in 51.9% TOC removal. The evolution profile of ammonium and nitrate ions was monitored during the treatment, and the organic degradation products of RB5 oxidation were identified by LC-MS analysis with a plausible degradation pathway being proposed. Quenching experiments indicated that electron hole (h + ) and reactive radicals (e.g. HO • /SO 4 •− ) were mainly responsible for RB5 removal in the UV/ZnO-GAC/PMS system. The catalyst reuse experiment shows that ZnO-GAC had no obvious deactivation after four cycles, which implied the reusability and stability of the prepared catalyst. Response surface methodology (RSM) with Box-Behnken design (BBD) was used to evaluate the effect of operating conditions, including PMS concentration, reaction temperature and initial pH on the removal rate of RB5. The result of adequacy check indicated the proposed RSM model was reliable and accurate to analyze the operating parameters of the UV/ZnO-GAC/PMS system.
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DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Yangyang Sun,Shaosheng Rao,Qinqin Liu,Chuang Zhi,Zhongxi Lu,Rong Ma,Zhongti Sun,Juan Yang
Although heterogeneous photocatalytic sterilization can avoid secondary pollution and achieve broad spectrum antibacterial effects, its low disinfection efficiency seriously hinders its development. Exploring and achieving precise electron-transfer channels in the interface of heterogeneous systems are an effective method to enhance photocatalytic sterilization. Herein, we designed a chemical Zn–N bonded nitrogen-doped porous carbon-loaded zinc oxide (ZnO/NC) Schottky heterojunction photocatalyst through oxidizing and carbonizing ZIF-8 in-situ at suitable temperatures. The Zn–N accurately facilitated the photogenerated electrons transfer from the conduction band (CB) site of ZnO to the NC surface as active site. Furthermore, the NC as carrier enhanced the light-absorption capacity (746 nm) of Schottky heterojunction and functioned as active site to promote the generation of reactive oxygen species (ROS). In addition, the slow-release effect of zinc ions (Zn 2+ ) from ZnO contributed to the accelerated death of bacteria. As a result, under simulated sunlight conditions, the ZnO/NC-400(1 h) Schottky heterojunction demonstrated an impressive antibacterial efficiency of 99.33 % against Escherichia coli , consistently exceeding 95 % in repeated experiments. This work presents a controllable and encouraging approach for constructing heterojunction with effective antibacterial properties.
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DOI
高影响因子
ECS Journal of Solid State Science and Technology
·
2017
·Vol. 6
·期 4
·M36
·
IF 1.787
Maher Jabeen,Muhammad Ishaq,Weiming Song,Liyang Xu,Iram Maqsood,Qigang Deng
The requisite to obtain reduced graphene oxide as an individual sheet and to maintain it in the reduced form introduces a new way of manipulative nanocomposite systems (e.g., semiconductor or metal nanoparticle and graphene composite). Herein, we developed a simple suitable UV-.assisted photocatalytic reduction method to prepare the most viable nanocomposite ZnO/RGO. Graphene oxide undergoes reduction reaction in ethanol- water system as it accepts electrons from UV irradiated semiconductor (ZnO), and subsequently characterized using different standard techniques. The presence of graphene in the composites were confirmed by X-ray diffraction (XRD), Raman, FTIR, SEM, TEM, and X-ray photoelectron spectroscopy (XPS) analysis. The highly efficient ZnO/RGO nanocomposite exhibited enhanced photocatalytic degradation performance for the degradation of methylene blue, with a maximum removal rate of (∼80%) as compared with pure ZnO nanoparticles (∼68%). This effective increase in degradation were caused by the prevention of electron–hole pair recombination in ZnO with the introduction of RGO. These findings suggest that the synthesized ZnO/RGO nanocomposite via photocatalytic approach not only offers UV-assisted reduction technique, but also open up a new way to obtain photoactive graphene-semiconductors, which could be effectively used in various application.
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Lin Wang,Jing Han,Yijiang Wu,Yaping Zhang,Qiang Zhang,Xuejiao Tan,Yingzi Yang,Weibing Li,Yuyu Bu,Jin-Ping Ao
In this paper, a ZnSe layer was formed by in-situ conversion on the surface of ZnO nanorod array, and then CdSe layer was transformed from the ZnSe layer by ion exchange method. Subsequently, a p-type poly 3,4-ethylenedioxythiophene (PEDOT) ultrathin conductive layer was deposited on the surface of CdSe by multi-current step deposition method. The separation and transmission processes of the photogenerated carriers were studied by analyzing the results of electrochemical impedance spectroscopy (EIS) and intensity modulated photocurrent/photovoltage spectroscopy (CIMPS/CIMVS). The in-situ growth method could reduce the interface barrier between ZnO and CdSe and optimize the interface exchange process of the photogenerated charge carriers. Meanwhile, the p-n junction constructed between PEDOT and CdSe layer could improve the separation efficiency of the photogenerated charge carriers. Therefore, PEDOT layer significantly promote the photoelectrochemical performance by passivating the surface state of CdSe and suppressing the secondary recombination of the photogenerated charge carriers.
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DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2013
·
IF 2.112
Yu Zhou,Lei Wang,Zhizhen Ye,Minggang Zhao,Hui Cai,Jingyun Huang
Micro/nano-porous ZnO films were synthesized through a simple biotemplate-directed method using mango core inner shell membranes as templates. The achieved ZnO films with wrinkles on the surface are combined of large holes and small pores in the bulk. High specific surface area, numerous microspaces, and small channels for fluid circulation provided by this unique structure along with the good biocompatibility and electron communication features of ZnO material make the product an ideal platform for the immobilization of enzymes The fabricated glucose biosensor based on the porous ZnO films exhibits good selective detection ability of analyte with good stability, high sensitivity of 50.58 μA cm −2 mM −1 and a wide linear range of 0.2–5.6 mM along with a low detection limit of 10 μM.
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DOI
高影响因子
Journal of Materials Chemistry A
·
2015
·Vol. 3
·期 20
·10890-10899
·
IF 7.443
Ting Hu,Lie Chen,Zhiqiang Deng,Yiwang Chen
Amphiphilic fullerene-end-capped poly(ethylene glycol) (C60-PEG) is synthesized to modify uniform ZnO arrayed nanorods (ANs) grown in situ on the surface of poly(N-vinyl pyrrolidone) decorated reduced graphene oxide (RGO). The two dimensional (2D) graphene provides a stable and conductive flat substrate for one dimensional (1D) arrayed nanorods with reduced defects. The addition of amphiphilic C60-PEG can improve the compatibility of the cathode buffer layer and the active layer. Moreover, C60-PEG produces a modified efficacy on the arrayed nanorods with reduced defects and decreased work function. Compared to the bare ZnO ANs, the C60-PEG modified ZnO ANs@RGO cathode buffer layer can reduce the recombination of carriers, increase the electron mobility and enhance electron extraction. As a result, the efficiency of the inverted polymer solar cells based on thieno[3,4-b]-thiophene/benzodithiophene (PTB7) : [6,6]-phenyl-C71-butyric acid methyl ester (PC71BM) is improved to 8.1% with better long-term stability.
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DOI
高影响因子
SOLAR ENERGY
·
2019
·
IF 4.674
Weihua Fei,Yun Song,Najun Li,Dongyun Chen,Qingfeng Xu,Hua Li,Jinghui He,Jianmei Lu
A visible-light-active Ni foam@ZnO@ZnFe-LDH composite photocatalyst was fabricated with well-defined porous 2D/2D interconnected nanosheets of ZnO and binary ZnFe layered double hydroxide (ZnFe-LDH) growing vertically on the Ni foam substrate. In view of the excellent conductivity of Ni foam, it can be used as an electrode substrate to deposit ZnO nanosheets on the surface by electrodeposition . Then the ultrathin layered 2D ZnFe-LDH was uniformly coated on ZnO nanosheets by hydrothermal method. A highly effective three-electrode photoelectrocatalytic (PEC) system was constructed with Ni foam@ZnO@ZnFe-LDH as photoanode. The 2D/2D core-shell heterojunction formed between ZnO core and ZnFe-LDH shell not only resulted in a narrowing bandgap and increased the visible light absorption of the ZnO, but also promoted the migration of the photogenerated electrons and then the degradation efficiency with a low applied potential was greatly improved. The dyes (Acid Red 1 as model) and hexavalent chromium ions (Cr(VI)) in water can be simultaneously removed by oxidation reaction on the anode and reduction reaction on the cathode, respectively. In addition, the Ni foam@ZnO@ZnFe-LDH composite photocatalyst also showed outstanding stability during the application process. Thus, the photoelectrocatalytic synergitic effect based on Ni foam@ZnO@ZnFe-LDH gives a simple and effective strategy to fast remove Cr(VI) and organic pollutants in PEC process at low voltage.
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DOI
高影响因子
INORGANIC CHEMISTRY
·
2018
·
IF 4.7
Jing Li,Baodan Liu,Aimin Wu,Bing Yang,Wenjin Yang,Fei Liu,Xinglai Zhang,Vladimir An,Xin Jiang
Photoelectrochemical water splitting has emerged as an effective artificial photosynthesis technology to generate clean energy of H2 from sunlight. The core issue in this reaction system is to develop a highly efficient photoanode with a large fraction of solar light absorption and greater active surface area. In this work, we take advantage of energy band engineering to synthesize (GaN)1–x(ZnO)x solid solution nanowires with ZnO contents ranging from 10.3% to 47.6% and corresponding band gap tailoring from 3.08 to 2.77 eV on the basis of the Au-assisted VLS mechanism. The morphology of nanowires directly grown on the conductive substrate facilitates the charge transfer and simultaneously improves the surface reaction sites. As a result, a photocurrent approximately 10 times larger than that for a conventional powder-based photoanode is obtained, which indicates the potential of (GaN)1–x(ZnO)x nanowires in the preparation of superior photoanodes for enhanced water splitting. It is anticipated that the water-splitting capability of (GaN)1–x(ZnO)x nanowire can be further increased through alignment control for enhanced visible light absorption and reduction of charge transfer resistance.
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DOI
高影响因子
OPTICAL MATERIALS
·
2020
·
IF 2.779
Yun Yang,Shujuan Tan,Gang Fang,Zhiyan Yang,Yongchao Li,Chaowen Yang
In high temperature environments, most low-emissivity coatings show monotonous and dull colors which make the visible-infrared compatible stealth still challenging. To achieve a wide range of color selection , in this work, three-dimensional (3D) SiO 2 –ZnO amorphous photonic crystals (APCs) are manufactured by electrodepositing Zn 2+ into 3D SiO 2 APCs, investigating the compatibility of adjustable structural color and low emissivity. A variety of structural colors could be easily obtained by modulating the diameter of SiO 2 nanospheres . In addition, the experimental parameters of spin-coating counts and electrodeposited time are studied to optimize the compatible performance of color and infrared emissivity. The results indicate that the doped ZnO effectively reduces the infrared emissivity in 3–5 μm waveband without changing the structural color of SiO 2 APCs. However, excess electrodeposited time of ZnO would cause the structural color faded gradually because of the increased refractive index and destroyed periodical structure. The adequate spin-coating counts is helpful for the bright structural color, but excess spin-coating counts would induce more defects in periodic structure and result in more absorption in 3–5 μm waveband. When the spin-coating counts and electrodeposition content of Zn 2+ in the SiO 2 APCs are properly modulated in this study, the SiO 2 –ZnO APCs can exhibit a good compatibility in desired structural color and low infrared emissivity (~0.4), as well as excellent thermal stability. This study provides a new approach for the design of multi-spectrum compatible stealth materials.
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DOI
高影响因子
ADVANCED ENGINEERING MATERIALS
·
2020
·Vol. 22
·期 5
·1901486
·
IF 3.217
Xiangyan Feng,Yuanyuan Lv,Lan Zhang,Jianjun Ding,Jun Sun,Xiaoxiao Li,Lin Chen,Kang Zheng,Xian Zhang,Xingyou Tian
With the rapid development of microelectronic information technology, high-power electronic devices require high heat dissipation. Herein, the preparation of low-temperature cofired ceramic (LTCC) applications with excellent thermal conductivity and dielectric properties is focused. B 2 O 3 –Bi 2 O 3 –SiO 2 –ZnO (BBSZ) glass/Al 2 O 3 /BN green sheets are prepared by tape casting and sintered at 850 °C. The crystal phase composition, microstructure, thermal conductivity, thermal expansion coefficient, and dielectric properties of LTCC are investigated. It is shown that nanoscale rod crystals ZnAl 2 O 4 and Bi are formed in the composite. The generated nanoscale rod crystals build a 3D heat conduction channel in the composite. The thermal conductivity of the sintered sheet with 20 wt% BN is 5.165 W m −1 K −1 . The sintered sheet containing 20 wt% BN has a low coefficient of thermal expansion (2.92 ppm °C −1 ) matched well with silicon and excellent dielectric properties ( ε r = 3.9672, tan δ = 1.49 × 10 −3 ) at 20 GHz. This material has great potential applications in electronic devices.
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DOI
高影响因子
JOURNAL OF ELECTROCERAMICS
·
2024
·
IF 1.7
Wang Bo-wen,Lu Jia-zheng,Gao Peng-zhao,Fu Zhi-yao,Jiang Zheng-long,Gong Wei-wei
In this paper, influence of radius and electronegativities of seven kinds of donors on the composition, microstructure, mechanical, thermal and electrical properties of ZnO varistors were investigated via XRD, SEM, XPS, mechanical, thermal and electrical properties tests. Results showed that when sintered at 1100 °C for 2 h, the obtained varistors exhibited a dense microstructure, where radius of donors played an important role on the grain size and size distribution of varistors; Mechanical properties and coefficient of thermal expansion of varistors were mainly affected by the radius of donors, with specimen 6# possessing the highest values of 123.46 MPa (σ f ), 80.47 GPa ( E f ), and 6.58 × 10 −6 °C −1 ( λ c ), respectively; Values of E 1mA and α initially increased and then decreased with the increase of donors’ radius, whereas those of J L and K exhibited opposite trends. E 1mA and α had maximum values of 569.94 V mm –1 and 26.70, whereas J L and K possessed the lowest values of 2.31 μA⋅cm −2 and 1.35, respectively, when Co 2+ worked as the donor (specimen 6#). The DC aging process of ZnO varistors obeyed the ion migration mechanism, the radius of donors can affect the number of it entering the ZnO lattice, which can limit the migration of zinc gaps via the formation of substitution and filling defects in the ZnO lattice. The electronegativity of donors can reduce the ion migration speed via the stronger electrostatic force, and specimen 6# possessed the lowest DC aging properties ( K T = 1.68).
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高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2024
·
IF 8.1
Guiming Xie,Xingyang Bai,Yanrui Niu,Zhangjun Bai,Qingyuan Yang,Jian Liu,Zhou-jun Wang
ZIF-8 was employed as partial Zn source to prepare high-performance Cu/ZnO/Al 2 O 3 catalysts for methanol synthesis via carbon dioxide (CO 2 ) hydrogenation. Among the CuZnAl-x catalysts (x = 1, 0.75, 0.5, 0.25 and 0, denoting molar ratio of ZIF-8/(ZIF-8 + Zn(NO 3 ) 2 ·6H 2 O), the CuZnAl-0.5 catalyst possessed the highest space time yield of methanol ( STY MeOH ), which recorded 416.4 g MeOH kg cat −1 h −1 at 250 °C and 3.0 MPa. Using ZIF-8 as partial Zn source was found to increase the specific surface area, induce oxygen vacancies, intensify metal-oxide interactions and enrich medium basic sites, which may rationalize the excellent methanol synthesis activity of the CuZnAl-0.5 catalyst. Besides, the CuZnAl-0.5 catalyst showed good stability for 30 h of reaction. This work offers a unique route to fabricate catalysts with the aid of MOFs precursors and highlights the significance of oxygen vacancies in methanol synthesis catalysts.
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DOI
高影响因子
危险品化学品经营许可证（带存储）