Environmental Chemistry Letters
·
2017
·Vol. 16
·期 1
·251-264
·
IF 3.594
Yein Win Thi,Wang Qun,Feng Xueying,Li Yang,Wu Xiaohong
Nanocomposites composed of two or more components with desirable performance have attracted tremendous attention, mainly due to the synergic effect between the components. The effective combination of ZnO and reduced graphene oxide would lead to ameliorate the photocatalytic performance. To enhance applicability of semiconductor photocatalytic, the composites used should be good interfacial contact governed by suitable particle size distribution. Herein we aim to fabricate the different crystallize size of ZnO nanoparticles (NPs) in ZnO–reduced graphene oxide (ZnO–rGO) nanocomposites by sonochemical synthesis and subsequent facile drying treatment method. The Zn precursor, Zn(Ac) 2 , with a plenty of functional groups, was used as a starting source for both reduction of graphene oxide and formation of ZnO on rGO sheets through chemical bonds without the addition of hazardous reducing agents. LiOH was chosen as an assistive reagent to enhance the complete reaction between Zn(Ac) 2 and GO in the formation of ZnO–rGO nanocomposites. More remarkably, drying condition has the great influence on the crystallize size of ZnO NPs in as-prepared ZnO–rGO nanocomposites. It is found that ZnO–rGO nanocomposites dried at −50 °C (freeze drying) show the highest photocatalytic efficiency in the degradation of rhodamine B (RhB) as compared to ZnO–rGO nanocomposites by other drying conditions under visible-light irradiation. Correlating the crystallize size obtained by different drying temperatures with the photocatalytic activity, it is probed that the smaller crystallize size in ZnO–rGO nanocomposites enhances the interfacial contact and a chemical bonding between rGO and ZnO NPs leading to the effective separation of electrons and holes. In addition, the O
·− 2
anion was determined to be the main active oxidant by free radicals trapping experiment and a photodegradation mechanism of ZnO–rGO nanocomposites over rhodamine B (RhB) was proposed based on our observations.
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materiomics
·
2024
·
IF 8.4
Di Wu,Yingxin He,Chi Lin,Bing Li,Jiangping Ma,Lujie Ruan,Yajie Feng,Chaogang Ban,Junjie Ding,Xiaoxing Wang,Danmei Yu,Li-Yong Gan,Xiaoyuan Zhou
Piezo-catalysis, which leverages mechanical energy to drive chemical reactions, is emerging as a promising method for sustainable energy production. While the enhancement of piezo-catalytic performance through metal-support interactions is well-documented, the critical influence of the synthesis atmosphere during metal-loaded piezo-catalyst preparation has been a notable gap in the field. To this end, we systematically investigate how different atmospheric conditions during the synthesis of catalysts—without gas flow or with Ar, N 2 and O 2 —affect metal dispersion, oxidation states, piezo-carrier dynamics, and electronic structure, and subsequently shape the metal-support interactions and piezo-catalytic activity. ZnO/Au, with Au deposited on ZnO, is selected as the model system, and hydrogen evolution reaction is used as the probe reaction. Our results demonstrate that an oxygen-enriched atmosphere significantly enhances the metal-support interactions, achieving an ultrahigh net hydrogen yield of 16.5 mmol·g –1 ·h –1 on ZnO/Au, a 3.58-fold increase over pristine ZnO. Specifically, the performance improvements substantially surpass those synthesized under other atmospheric conditions. Conversely, exposure to CO 2 transforms the ZnO support into ZnCO 3 , adversely affecting its catalytic activity. These findings reveal the crucial impact of synthesis conditions on piezo-catalyst performance and thereby open new avenues for optimizing catalyst systems for enhanced sustainability.
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Fangbin Wang,Jing Qi,Liang Zhu
Bacterial infection and contamination is a tough problem that generates numerous hazardous factors in areas ranging from human health, clinical to industrial manufacture. Here, an Ag/MoS 2 nanozyme-modified ZnO nanopillar surface was designed and assembled. This nanopillar surface can achieve remarkable antibacterial effects against Gram-positive Staphylococcus aureus and Gram-negative Escherichia coli . The obtained nanozyme-modified nanopillar surface demonstrated mechanical antibacterial property with a killing rate of 69.6% and 70.4% to Staphylococcus aureus and Escherichia coli , respectively. Moreover, the surface disables bacteria under H 2 O 2 efficiently, reaching a lethality rate of 89.7% and 98.4% in 30 min, respectively. The superiorities of fast and high lethality rate are owed to a synergistic antibacterial functions consisted of mechanical rupture, enormous ROS generation and silver ions release. Meanwhile, the nanozyme-modified nanopillar surface also shows the surface superhydrophobic property with an antibacterial adhesion rate of over 99.9%. Therefore, the scheme pdresented in this study can provide a potential perspective to solve bacterial infection and contamination in the fields of daily life, clinical and industrial manufacture.
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS & DESIGN
·
2015
·
IF 3.501
Chen Hao,Yinglu Yang,Yuru Shen,Feng Feng,Xiaohong Wang,Yutao Zhao,Cunwang Ge
The graphene (G)–ZnO (G–ZnO) nanocomposites with high photocatalytic activity have been successfully prepared by a simple and inexpensive liquid phase-based ultrasonic-assisted method with different doping amounts of graphene oxide . The as-prepared products were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), Raman spectroscopy , UV–visible diffuse reflectance spectroscopy (UV–vis/DRS) and Brunauer–Emmett–Teller (BET) analysis. The results indicate that the assistance of ultrasonic can effectively decrease the size of ZnO nanostructure and increase the uniformity of the mixture of graphene and ZnO particles. Meanwhile, the sunlight absorption of the G–ZnO nanocomposite is gradually improving with the increase of the ratio of graphene. The obtained G–ZnO-30 photocatalyst shows the best photocatalytic activity for methylene blue (MB) and methyl orange (MO) under sunlight irradiation. The degradation rates of MB and MO in the presence of G–ZnO-30 reached up to 98.1% and 95.7%, respectively, under solar radiation for 1 h and 6 h. In addition, the photocatalyst exhibits outstanding separability and high stability.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2024
·Vol. 59
·期 45
·21027-21039
·
IF 3.5
Zhang Peng,Guo Mengya,Wang Fujiang,Tang Qiong,Ge Hui,Guo Shuke,Zhou Ligong,Li Xuekuan,Dong Jinxiang,Tang Mingxing,Liu Lei
Selective hydrogenation is an effective approach to utilize coal tar and slurry oil to produce high value-added fine chemicals. However, how to efficiently improve the selectivity of the target product and the stability of the catalyst is difficult. Herein, the PdZn alloy catalyst was synthesized by the assistance of strong interaction between active metal (Pd) and support (ZnO) for hydrogenation of anthracene to symmetrical octahydro anthracene (sym-OHA). The PdZn alloy catalyst reduced at 400 °C was found to exhibit a 100% conversion of the anthracen with 84.77% selectivity to sym-OHA under the optimized conditions (200 °C, 1 MPa). The characterization analysis indicated that the PdZn alloy with electron-rich Pd active sites is more efficient in the selective hydrogenation than the pure Pd metal. The study of the deep hydrogenation of sym-OHA (Hydrogenation of sym-OHA to perhydroanhtracene) showed that PdZn alloy catalysts were inactive to further hydrogenation of sym-OHA. Additionally, due to the strong interaction between Pd and ZnO, the Pd/ZnO(400) catalyst shows high stability for five cycles. These findings are of practical significance for the selective hydrogenation of polycyclic aromatic hydrocarbons (PAHs) to produce high value-added products.
✓ 已验证
产品关联
DOI
高影响因子
SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
2016
·
IF 4.732
Weixin Li,Qinghui Jiang,Junyou Yang,Yubo Luo,Xin Li,Yaru Hou,Shuqin Zhou
In this study, ZnO/Zn 2 SnO 4 (ZSO) composite is synthesized as a promising alternative compact layer to TiO 2 by spray pyrolysis method. Owing to the ZnO/ZSO composite possesses higher carrier mobility and suitable band gap structure, it will behave well in the application of solar cells. The characterization results show that the ZnO/ZSO composite compact layer manifests better optical transmittance , enhanced electrons collective efficiency and superior electrical conductivity . Consequently, the corresponding photo-current is improved effectively when compared with that of TiO 2 compact layer. The optimum efficiency of perovskite solar cell based on the ZnO/ZSO composite compact layer reaches 12.03% at AM 1.5 solar light of 100 mW cm −2 , which is 18% higher than that of perovskite solar cell based on the TiO 2 compact layer.
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2016
·
IF 4.758
Yang Cao,Xiaoxin Zou,Xue Wang,Jingyu Qian,Ni Bai,Guo-Dong Li
For the safe of both production and life, it is a key issue to detect explosives effectively. Here, we report that trace amount of nitro compounds can be detected by the sensor based on porous ZnO nanofibers . As a result, the response towards 200 ppb 4-nitrotoluene, 120 ppb 2, 4-dinitrotoluene and 30 ppm nitromethane are 6.8, 3.0 and 29, respectively. The detecting limit towards 2,4-dinitrotoluene and nitromethane is 3 ppb and 100 ppb. It is found that the sensing performance is greatly affected by the molecular structure of these nitro compounds under the same condition. That is, the sensing behavior is related to the alkyl group other than the nitro group . A reasonable sensing mechanism is proposed based on the theoretical and experimental results.
✓ 已验证
产品关联
DOI
高影响因子
Materials Science & Engineering C-Materials for Biological Applications
·
2016
·
IF 3.42
Qian Tang,Zai-yong Li,Yu-bo Wei,Xia Yang,Lan-tao Liu,Cheng-bin Gong,Xue-bing Ma,Michael Hon-wah Lam,Cheuk-fai Chow
A photoresponsive surface molecularly imprinted polymer for uric acid in physiological fluids was fabricated through a facile and effective method using bio-safe and biocompatible ZnO nanorods as a support. The strategy was carried out by introducing double bonds on the surface of the ZnO nanorods with 3-methacryloxypropyltrimethoxysilane. The surface molecularly imprinted polymer on ZnO nanorods was then prepared by surface polymerization using uric acid as template, water-soluble 5-[(4-(methacryloyloxy)phenyl)diazenyl]isophthalic acid as functional monomer, and triethanolamine trimethacryl ester as cross-linker. The surface molecularly imprinted polymer on ZnO nanorods showed good photoresponsive properties, high recognition ability, and fast binding kinetics toward uric acid, with a dissociation constant of 3.22 × 10 − 5 M in aqueous NaH 2 PO 4 buffer at pH = 7.0 and a maximal adsorption capacity of 1.45 μmol g − 1 . Upon alternate irradiation at 365 and 440 nm, the surface molecularly imprinted polymer on ZnO nanorods can quantitatively uptake and release uric acid.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
AICHE JOURNAL
·
2016
·Vol. 62
·期 8
·2614-2621
·
IF 2.98
Luting Ling,Wei Wang,Cai-Feng Wang,Su Chen
The intrinsic low quantum yield (QY) of type II core shell quantum dots (QDs) composes the limitation for these heterostructured nanomaterials to be used in practical application. Herein, magnetic hyperthermia method is employed to intensify reaction process and facilely synthesize CdTe/CdSe heterostructured QDs with improved optical performance for the first time. The QY of the type II QDs is increased to 49% by further growing an inert ZnO layer. The type I interface between CdSe and ZnO helps confine electrons to the inner structure of the QDs, thus improving the QY. The successful preparation and performance enhancement of the CdTe/CdSe type II QDs via magnetic hyperthermia method demonstrate the great potential of this method for the preparation of other materials. Besides, the red-emission QDs are used as conversion materials in white light emitting diodes to reveal their promising application in practical illumination. © 2016 American Institute of Chemical Engineers AIChE J , 62: 2614–2621, 2016
✓ 已验证
产品关联
DOI
高影响因子
CARBON
·
2017
·
IF 6.337
Changqing Song,Xiaowei Yin,Meikang Han,Xinliang Li,Zexin Hou,Litong Zhang,Laifei Cheng
Flexible and high-performance electromagnetic absorbing materials of three-dimensional (3D) hierarchical reduced graphene oxide (RGO) foams decorated with in-situ grown ZnO nanowires (ZnO nws ) were realized by a direct freeze-drying and hydrothermal process. The unique structure not only effectively reduces agglomeration of RGO and the density of composites, but also makes great contributions to impedance match, dielectric loss and inner scattering, achieving enhanced microwave absorption performance . When RGO foam is 0.8 mg/mL, the ZnO nws /RGO foam/PDMS composite with 3.3 wt% absorber loading attains a minimum reflection loss value of −27.8 dB at 9.57 GHz with a thickness of 4.8 mm, and a wide effective absorption bandwidth of 4.2 GHz covering the whole X band (8.2–12.4 GHz). The fundamental microwave absorption mechanism of the composites is discussed. These results demonstrate a promising method to fabricate an economical, lightweight, broadband and highly efficient microwave absorption material .
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Sciences
·
2017
·
IF 2.865
Xiangjuan Yuan,Xuan Yan,Haiming Xu,Dongya Li,Lei Sun,Gang Cao,Dongsheng Xia
Enhanced ozonation degradation of atrazine (ATZ) with nano-ZnO (nZnO) as catalyst and the influences of the operational parameters have been investigated through semi-continuous experiments in this study. The results demonstrated that the combination of ozone (O 3 ) and nZnO showed an obvious synergetic effect and the ATZ degradation conformed to pseudo-first-order kinetics. An improvement of ATZ degradation efficiency by 41.8% and pseudo-first-order rate constant by more than a factor of four was obtained in the O 3 /nZnO process after 5 min of reaction compared to O 3 alone. Meanwhile, the degradation efficiency of ATZ was gradually enhanced with increasing nZnO dosage and initial pH in the range from 3.0 to 8.0, and a higher amount of ATZ was degraded when the initial concentration of ATZ rose from 0.5 to 5 mg/L. Additionally, sulfate ion, chloride ion, nitrate ion and low concentrations of humic acid substances led to enhancement of the ATZ degradation. The notable decrease of ATZ removal efficiency observed in the presence of radical scavengers and the results of free radical tests indicated that OH is the dominant active radical species. The mechanism investigation demonstrated that the enhancement effect could be attributed to the introduction of nZnO, which could promote the utilization of O 3 , enhance the formation of superoxide radical, and further accelerate the production of hydrogen peroxide and the generation of OH/O 2 − .
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Catalysis Science & Technology
·
2017
·Vol. 7
·期 11
·2236-2244
·
IF 5.773
Huabin Chen,Wenxia Liu,Zhuozhuo Qin
The majority of current photocatalysts are generally excited under ultraviolet (UV) and visible light, while near-infrared (NIR) light accounting for nearly half of solar light has not been fully used. Herein, a ZnO/ZnFe2O4 nanocomposite with the ability to degrade an organic dye in the presence of H2O2 under NIR irradiation was prepared by a co-precipitation method followed by calcination at 800 °C. As revealed by optical absorption analysis, the ZnO/ZnFe2O4 nanocomposite exhibits significant optical absorption in the UV, visible and NIR light regions. Benefitting from this unique photo-absorption property and the generation of reactive ˙OH mainly by the reaction of photogenerated electrons with H2O2, the ZnO/ZnFe2O4 nanocomposite performs well in photodegrading methyl orange under either UV, visible or NIR irradiation. Moreover, the UV, visible and NIR photocatalytic activities of the ZnO/ZnFe2O4 nanocomposite did not change significantly after three runs of recycling. This finding opens a new approach for fully utilizing solar light energy, especially the energy of NIR light.
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）