JOURNAL OF MEMBRANE SCIENCE
·
2020
·
IF 7.183
Xiujing Huang,Yingbo Chen,Xianshe Feng,Xiaoyu Hu,Yufeng Zhang,Lei Liu
In this study, Ag@ZnO-Oleic acid (OAc)/polyamide (PA) thin film nanocomposite (TFN) membranes were prepared by interfacial polymerization with dispersing hydrophobic Ag@ZnO-OAc core-shell nanoparticles in trimesoyl chloride (TMC) solutions. The Ag@ZnO-OAc nanoparticle structure and interactions between OAc and TMC were confirmed by TEM , XPS and FTIR. Surface morphology , roughness, chemical composition, hydrophilicity and charges of the synthesized membranes were characterized by SEM, FTIR, contact angle and zeta potential analyses. The results showed that incorporating the Ag@ZnO-OAc nanoparticles into the PA layer improved chemical and physical properties of the TFN membranes. Compared with the nanoparticle-free TFC membrane, the Ag@ZnO-OAc/PA TFN membrane showed a considerably higher salt rejection, and a lower flux decline rate when tested with filtration of BSA solution as a model foulant and a higher flux recovery with water flush. In addition, the Ag@ZnO-OAc/PA TFN membrane showed excellent antibacterial performance against E. coli and S. aureus .
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高影响因子
Nanoscale Advances
·
2021
·Vol. 3
·期 16
·4851-4857
·
IF 4.553
Xiaoli Yang,Shaodong Sun,Jie Cui,Man Yang,Qing Yang,Peng Xiao,Shuhua Liang
Heterojunction engineering is an effective strategy to enhance the photodegradation activity via improving the spatial charge separation. However, the poor interface interactions and stability limit the photocatalytic activity and stability of traditional heterojunctions. Herein, robust BiOCl/ZnO p–n heterojunctions with semi-coherent interfaces were prepared by a one-pot hydrothermal method to improve the activity and stability toward photocatalytic degradation than that of the counterpart, in which the semi-coherent interfaces exhibited lower phase boundary energy, resulting in highly-stable interfaces between BiOCl and ZnO as well as the formation of the built-in electric field in this robust p–n heterojunction for enhanced charge separation. The cycle test results verified that the BiOCl/ZnO heterojunctions with semi-coherent interfaces can maintain the photocatalytic degradation activity at the initial level even after 10 cycles, while deactivation of the sample without semi-coherent interfaces occurred after 3 cycles only. Optical and electrical properties revealed that BiOCl/ZnO heterojunctions with semi-coherent interfaces possessed the highest electron migration and charge separation efficiency, resulting in the highest photodegradation activity. Density functional theory (DFT) calculations and electron spin-resonance (ESR) results verified that the enhanced charge separation was assigned to the type-II photocatalytic mechanism, leading to the enhancement of ˙OH and ˙O2− reactive oxygen species. This work would provoke the development of one-step construction of new highly active BiOX (X = Cl, Br, and I)-based heterogeneous photocatalysts with stable semi-coherent interfaces.
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PubMed
高影响因子
Inorganic Chemistry Frontiers
·
2021
·Vol. 8
·期 22
·4903-4913
·
IF 6.569
Yufeng Yao,Jiayi Yuan,Ming Shen,Bin Du
In this study, hexylresorcinol calix[4]arene-ZnO-Au (HRCA-ZnO-Au) micro–nano materials are synthesized by a simple atmospheric reflux. AuCl4− ions are in situ reduced to Au by the phenolic hydroxyl groups of amphiphilic HRCA and deposited on the primarily formed ZnO sheets, which prevents Zn2+ ions in the solution from depositing at this position. Finally, the flake sample is obtained. HRCA and chloroauric acid effectively shape the morphology of ZnO from micron-sized flowers to nanometer sheets, and they significantly increase the specific surface area of the sample. Low temperature calcination of the HRCA-ZnO-Au composite micro–nano materials partially removes calixarene molecules and exposes the surface of ZnO–Au. Thus, the photocatalytic activity of ZnO–Au is significantly improved due to the synergistic effect between ZnO and Au.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2019
·
IF 6.393
Jianmei Gao,Hu Meng,Qi Hu,Junyu Chang,Liang Feng
Semiconductor metal oxide (SMO)-based GC detector was investigated by rational design of 2D materials used as detector sensing film, which was verified to be a feasible way to overcome tailing and peak spreading phenomena usually existed in SMOs-based GC detector. Specifically, 2D flake-like ZnO chosen as an example was successfully synthesized by employing 2D ZIF-8 as template, and then acted as detector in portable gas chromatograph. The properties of detector were evaluated via detection of alcohols and other oxygen-containing VOCs. The results exhibited good linear dependence between peak heights and concentrations of target gases with a short response and recovery time (several seconds) and a high sensitivity, low detection limit (ppb level), together with prominent selectivity for oxygen-containing VOCs than hydrocarbons. Moreover, tailing and peak spreading phenomena mentioned above were hardly observed due to a smaller diffusion barrier for 2D material as compared to 3D counter parts. It is concluded that 2D materials-based portable GC detectors indeed possess great potential in practical application in the future.
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Nanomaterials
·
2020
·Vol. 10
·期 1
·80
·
IF 4.324
Fanchen Bu,Wenfei Shen,Xiaolin Zhang,Yao Wang,Laurence A. Belfiore,Jianguo Tang
Polymer solar cells (PSCs) have shown excellent photovoltaic performance, however, extending the spectral response range to the ultraviolet (UV) region and enhancing the UV light stability remain two challenges to overcome in the development of PSCs. Lanthanide down-conversion materials can absorb the UV light and re-emit it at the visible region that matches well with the absorption of the active layer material PTB7-Th (poly[[2,6′-4,8-di(5-ethylhexylthienyl)benzo[1,2-b;3,3-b]dithiophene][3-fluoro-2[(2-ethylhexyl)carbony]thieno[3,4-b]thiophenediyl]]) and PBDB-T-2F, thus helping to enhance the photovoltaic performance and UV light stability of PSCs. In this research, a down-conversion material Eu(TTA)3phen (ETP) is introduced into the cathode transport layer (ZnO) in PSCs to manipulate its nanostructure morphology for its application in hyperfine structure of PSCs. The device based on the ZnO/ETP electron transport layer can obtain power conversion efficiencies (PCEs) of 9.22% (PTB7-Th–PC71BM ([6,6]-phenylC71-butyric acid methyl ester) device) and 13.12% (PBDB-T-2F–IT-4F device), respectively. Besides, in the research on PTB7-Th-PC71BM device, the stability of the device based on ZnO/ETP layer is prolonged by 70% compared with the ZnO device. The results suggest that the ZnO/ETP layer plays the role of enhanced photovoltaic performance and prolonged device stability, as well as reducing photo-loss and UV degradation for PSCs.Keywords:down-conversion materials;polymer solar cells;enhance light absorption;enhance UV stability;high photovoltaic performances
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高影响因子
WATER ENVIRONMENT RESEARCH
·
2019
·Vol. 91
·期 7
·634-641
·
IF 1.24
Xiao Zhang,Jing Zhang,Xue Huang,Qing Ping Wu,Chun Hui Yan,Jin Feng Lu
ZnO/Fe 3 O 4 @carbon spheres, which synthesized via a calcination process used Zn/Fe metal–organic frameworks (Zn/Fe–MOFs) as a precursor, were studied for the activation of peroxymonosulfate (PMS) for the degradation of Acid Orange 7 (AO7). The ZnO/Fe 3 O 4 @carbon spheres exhibited relatively high catalytic degradation properties for AO7 in an aqueous solution. The AO7 degradation reached 93.6% in 15 min under the conditions: 0.20 g/L ZnO/Fe 3 O 4 @carbon spheres, 1.25 mmol/L PMS, 0.03 mmol/L AO7, and initial pH of 4. Findings revealed that higher ZnO/Fe 3 O 4 @carbon spheres dose and PMS concentration, lower initial AO7 concentration, and acidic pH favored the AO7 degradation to a certain extent. The mechanisms for the activation of PMS by ZnO/Fe 3 O 4 @carbon spheres were proposed based on the results of radical identification tests and structure characterization. Both radical and nonradical pathways contribute to the AO7 degradation in this system. Practitioner points PMS + ZnO/Fe 3 O 4 @carbon spheres system can effectively catalyze PMS to decompose AO7. Both radical and nonradical pathways contribute to the degradation of AO7 in this system. The acidic condition was favorable for the activation of PMS.
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SOLAR ENERGY
·
2019
·
IF 4.674
Zhen Li,Libo Yu
Mn-Cd x Zn 1-x Se@ZnO multi-shelled (including single-shelled, double-shelled, and triple-shelled) hollow microspheres (HMS) were successfully synthesized for application in quantum dots sensitized solar cell (QDSSC). The influence of shell numbers on photovoltaic performance of QDSSC were investigated. The results showed that larger surface area, repeated light reflection and reinforced light scattering can be achieved with triple-shelled HMS, which can improve light harvesting efficiency. Furthermore, midgap state created by Mn-doping in Cd x Zn 1-x Se will facilitate electrons injection and collection from excited Cd x Zn 1-x Se quantum dots (QDs) to ZnO. The multi-shelled effects and Mn-doping finally improve the short-circuit current (J sc ) of Mn-Cd x Zn 1-x Se@ZnO tripled-shelled HMS solar cell to 20.21 mA cm −2 , leading to the power conversion efficiency significantly enhanced to 3.39%.
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高影响因子
Journal of Cleaner Production
·
2019
·
IF 6.395
Yi Zhao,Wenlin Zhou,Yan Wang,Baoyu Gao,Xing Xu,Yanxia Zhao
Natural organic matter (NOM) can influence the properties and behavior of metal nanoparticles (MNPs) in aquatic environments. Thus, understanding the effect of NOM on MNPs’ physiochemical properties is critical for identifying an effective water treatment processes, and controlling the potential risk they pose to ecological and human health. In this study, adsorption and leaching experiments were performed with powder activated carbon (PAC), to investigate the effect of humic acid (HA) and bovine serum albumin (BSA) on the removal of ZnO nanoparticles (ZnONPs) from an aqueous environment and their stability on the adsorbed PAC. The different ZnONPs forms— particulate, colloidal, and dissolved Zn fractions, were respectively considered. The adsorption experiments demonstrated that both colloidal and dissolved Zn fractions can adsorb on the PAC’s surface. As the HA concentration increased from 0 to 20 mg/L, the colloidal Zn fraction’s adsorption efficiency decreased from 74.49% to 61.24%. However, BSA did not significantly influence the colloidal Zn fraction’s adsorption. The leaching experiments showed that the colloidal Zn fraction would release from the PAC’s surface, and most of them transferred to the dissolved Zn fraction. As the HA concentration increased from 0 to 20 mg/L, the Zn concentration leached from the PAC adsorbed ZnONPs reduced from 0.956 to 0.694 mg/g. Comparatively, the leached Zn concentration varied only slightly with an equal increase in BSA concentration.
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高影响因子
POLYMER INTERNATIONAL
·
2018
·Vol. 67
·期 8
·1003-1010
·
IF 2.352
Yangyang Wang,Zhiping Zhou,Wanzhen Xu,Yu Luan,Yi Lu,Yanfei Yang,Tianshu Liu,SongJun Li,Wenming Yang
This work describes the preparation of molecularly imprinted polymers using ZnO quantum dots, which were used for the selective detection of diethylhexyl phthalate (DEHP). Methacrylic acid, ethylene glycol dimethacrylate, 2,2′-azobis(2-methylpropionitrile) and ZnO were used as functional monomer, crosslinker, initiator and optical material, respectively. Molecularly imprinted polymers were successfully synthesized, and the linear relationship between fluorescence intensity and amount was from 0.5 to 40 µmol L −1 for DEHP. The coefficient of correlation was 0.9923 and the imprinting factor was 11.16. The results were above 97.50% and relative standard deviation below 3.86% for the detection of DEPH in actual water samples. This study could provide a novel method using molecularly imprinted polymers for highly selective and sensitive detection of DEHP. © 2018 Society of Chemical Industry
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高影响因子
CRYSTENGCOMM
·
2018
·Vol. 20
·期 25
·3550-3558
·
IF 3.304
Fang Tang,Meizhu Zhang,Zhongbo Li,Zhaofang Du,Bensong Chen,Xuan He,Siyu Zhao
Surface-enhanced Raman scattering (SERS) is one of the most promising methods in detecting trace amounts of molecules owing to its high sensitivity, fast response, and high molecular specificity. One of the key issues for SERS applications is to fabricate highly sensitive and homogeneous SERS substrates. Here, we present a template-assisted synthetic approach to fabricate urchin-like Ag-nanoparticle (Ag-NP) decorated ZnO-nanorods grafted on hexagonally ordered polyacrylonitrile (PAN) nanopillar arrays as flexible and reliable surface-enhanced Raman scattering (SERS) substrates, which are achieved by a combined process of molding highly ordered PAN-nanopillar array films, electrochemical depositing ZnO nanorods onto molded PAN nanopillar arrays, then sputtering Ag-NPs onto the surface of ZnO nanorods. The resultant hetero-hierarchical nanostructure exhibits not only much stronger SERS activity but also uniform SERS signals over the whole arrays based on the high density of nanogaps (hot spots) between the neighboring Ag-NPs on both the same ZnO-nanorods and adjacent ZnO-nanorods and the highly ordered PAN-nanopillar arrays. Using the Ag-NP assembled ZnO-nanorod arrays as SERS-substrates, not only 10−13 M Rhodamine 6G has been identified, but also 10−8 M parathion-methyl has been recognized, showing great potential in detection of trace organic pollutants in the environment. Furthermore, the Ag-NPs@ZnO-nanorods could achieve self-cleaning and reactivation of SERS-activity by simple UV light irradiation and retain stable SERS sensitivity even after five cycles, demonstrating the high reusability of the hybrid substrates.
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Materials
·
2018
·Vol. 11
·期 5
·780
·
IF 2.467
Xiaodong Sun,Guangyan Ma,Xuliang Lv,Mingxu Sui,Huabing Li,Fan Wu,Jijun Wang
In this study, Fe3O4/ZnO core–shell nanocomposites were synthesized through a chemical method of coating the magnetic core (Fe3O4) with ZnO by co-precipitation of Fe3O4with zinc acetate in a basic medium of ammonium hydroxide. The phase structure, morphology and electromagnetic parameters of the Fe3O4/ZnO core–shell nanocomposites were investigated. The results indicated that the concentration of the solvent was responsible for controlling the morphology of the composites, which further influenced their impedance matching and microwave absorption properties. Moreover, Fe3O4/ZnO nanocomposites exhibited an enhanced absorption capacity in comparison with the naked Fe3O4nanospheres. Specifically, the minimum reflection loss value reached −50.79 dB at 4.38 GHz when the thickness was 4.5 mm. It is expected that the Fe3O4/ZnO core–shell structured nanocomposites could be a promising candidate as high-performance microwave absorbers.Keywords:core–shell structure;electromagnetic absorption;interfacial polarization;Fe3O4;ZnO
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高影响因子
Environmental Science-Nano
·
2018
·Vol. 6
·期 2
·528-539
·
IF 6.087
Haining Huang,Yinguang Chen,Shouye Yang,Xiong Zheng
Emerging contaminants, such as engineered metal oxide nanoparticles (NPs) and antibiotic resistance genes (ARGs), were reported to be accumulated in waste activated sludge. In this study, the potential impacts of CuO and ZnO NPs on the fate of ARGs during sludge anaerobic digestion were assessed. Metagenomic results showed that the presence of CuO or ZnO NPs increased ARG abundance but had no significant effects on the percentages of resistance mechanisms and types. Further functional analysis of the metagenomes revealed that signal transduction was stimulated by both NPs, especially two-component regulatory systems (TCRS) responsible for quorum sensing (QS), pili synthesis and metal tolerance. Moreover, it was found that the activated QS was closely associated with the shifted bacterial communities, especially enriched genera, such as Acidovorax, Burkholderia, Pseudomonas and Rhodobacter, which were not only the producers of QS signals but also the hosts of ARGs. Meanwhile, the triggered pili synthesis, combined with the increased abundance of mobile genetic elements (plasmids, integrons and insertion sequences), would facilitate the transfer of ARGs among diverse bacteria. Furthermore, the induced resistance to copper/zinc and other metals, such as mercury and arsenic, probably promoted the co-selection between metal and antibiotic resistance. The above results indicated that the propagation of ARGs in digesters might be driven by the NP-stimulated signal transduction. These findings may bring new insights into the understanding of ARG responses to diverse environmental stimuli.
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