Materials Today Communications
·
2022
·
IF 3.662
Kouhua Zhang,Yuting Wang,Ling Li,Li Jia
Residual tetracyclines (TCs) in the aquatic environment are a prominent issue due to their long environmental half-life and toxicity to the ecosystem and human health. Therefore, it is urgently necessary to develop low-cost and eco-friendly materials to remove TCs from environmental waters. Herein, the alginate-based nanofibers loaded with ZnO nanoparticles (ZnO/SA-NFs) were fabricated through an electrospinning approach. The nanofibers are porous materials with a Brunauer-Emmett-Teller surface area of 5.443 m 2 g −1 and a pore diameter of 19.0 nm. The adsorption kinetics data favor the pseudo-second-order model, and the adsorption isotherms data follow the Liu model well. The adsorption capacities of tetracycline, oxytetracycline, and doxycycline were 248.6, 244.5, and 388.6 mg g −1 , respectively. The thermodynamic study suggested that the adsorption of TCs on ZnO/SA-NFs was spontaneous and endothermic. Research on the adsorption mechanism indicated that the synergistic action of ZnO and SA was responsible for improving the adsorption capacity of TCs. More importantly, this material showed excellent removal performance for TCs in actual water samples, suggesting that the composite nanofibers will have tremendous prospects in the remediation of TCs-contaminated water.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
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IF 5.518
Yuanjie Xu,Shichao Yang,Meihui Ying,Xing Lin,Haibo Pan
Metal-organic frameworks (MOFs) are with extensive attention for environmental remediation due to their various modification and high density of active sites. Herein, a series of Ag/ZnO@ZIF-C with core-shell structure and graphene carbon (C) acts as a sandwich bridge were designed as a photocatalyst , accelerating the interfacial charge transfer rate between Ag and ZnO. Photocatalytic activities of Ag/ZnO@ZIF-C is remarkably improved toward rhodamine B (RhB) under UV irradiation , i.e., the degradation rate by Ag/ZnO@ZIF-C (20 wt%) is 2.27 times than that of P25. RhB molecules were simultaneously photodegraded at multiple sites, including N-site de-ethyl, conjugate structure and benzene ring . The photocatalytic upgrading performance was recognized to the synergetic interface between ZnO@ZIF-C and Ag nanoparticles (NPs) with effective separation and suppressed the recombination of electrons and holes. It is suggesting that the electrons in the valence band (VB) of ZnO are excited to the conduction band (CB) and transferred to Ag NPs through the ZIF-C layer, then react with adsorbed oxygen to create superoxide radicals and degrade RhB into small molecules. After a five-consecutive operation, its photocatalytic efficiency by Ag/ZnO@ZIF-C (20 wt%) still maintains at 95.11 %. This work provides a promising method for the rational design of high-performance carbon doped photocatalysts for environmental remediation.
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RSC Advances
·
2023
·Vol. 13
·期 8
·5208-5218
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IF 3.9
Thi Viet Ha Luu,Ngoc Nhiem Dao,Hoang Ai Le Pham,Quang Bac Nguyen,Van Cuong Nguyen,Phuc Huu Dang
In this work, Ta-doped ZnO (Ta-ZnO) nanomaterials were synthesized by the hydrothermal method at different temperatures (110, 150, and 170 °C) for the photodegradation of methylene blue (MB) under visible light. Ta doping significantly affects the crystal defects, optical properties, and MB photocatalytic efficiency of ZnO materials. The optical absorption edge of Ta-ZnO 150 was redshifted compared to undoped ZnO, correlating to bandgap narrowing (EgTa–ZnO = 2.92 eV; EgZnO = 3.07 eV), implying that Ta doped ZnO is capable of absorbing visible light. Besides, Ta-doping was the reason for enhanced blue light emission in the photoluminescence spectrum, which is related to the oxygen defect V0O. It is also observed in the XPS spectra, where the percentage of oxygen in the oxygen-deficient regions (O531.5 eV) of Ta-ZnO150 is higher than that of ZnO150. It is an important factor in enhancing ZnO's photocatalytic efficiency. The MB degradation efficiency of Ta-doped ZnO reached the highest for Ta-ZnO 150 and was 2.5 times higher than ZnO under a halogen lamp (HL). Notably, the influence of hydrothermal temperature on the structural, morphological, and photoelectrochemical properties was discussed in detail. As a result, the optimal hydrothermal temperature for synthesizing the nanorod is 150 °C. Furthermore, photocatalytic experiments were also performed under simulated sunlight and natural sunlight. The nature of the photo-oxidative degradation of MB was also investigated.
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PubMed
高影响因子
RARE METALS
·
2022
·Vol. 42
·期 4
·1274-1282
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IF 6.318
Zha Ai-Yun,Zha Qing-Bing,Li Zhi,Zhang Hong-Min,Ma Xue-Feng,Xie Wen,Zhu Ming-Shan
Bisphenol A (BPA), one of the most commonly used plastic organic monomers, is widely used in manufacturing food packaging and containers. However, the gradual emissions of BPA from manufacturing plastic products bring great potential in human health threats, which urgently need to develop a simple and rapid method for detecting BPA. Cetyltrimethylammonium bromide (CTAB), a typical surfactant, is used to enhance the electrochemical detection of trace endocrine disruptors due to the fact that it can effectively enrich and absorb hydrophobic phenolic compounds through the hydrophobicity of its long-chain alkanes. Based on these, the present study reports a ternary composite of Au on zinc oxide/reduced graphene oxide nanosheets (Au/ZnO/rGO) as electrochemical sensor for detecting BPA. With the addition of CTAB, the analytic performances toward BPA detection are significantly improved 3.8 times compared with those without CTAB. The pH, accumulation potential and time are optimized. Moreover, the electrochemical activity of CTAB/Au/ZnO/rGO sensor is also evaluated by cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), differential pulse voltammetry (DPV) and scan rate. The sensor displays two linear range from 10 to 1340 nmol·L −1 and 1340 to 10,000 nmol·L −1 , and a low detection limit of 4.95 nmol·L −1 . Lastly, the sensor also exhibits good reproducibility, selectivity and potential practical application for BPA detection in real samples. Graphical abstract
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Biomedical Materials
·
2022
·Vol. 17
·期 6
·065023
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IF 4.103
Dewei Qiu,Ping Zhou,Jiawei Kang,Zhijun Chen,Zhiyong Xu,Hanwen Yang,Jun Tao,Fanrong Ai
The treatment of implant-associated bone infection remains a significant clinical challenge. However, bone scaffolds with antimicrobial activity and osteoinductive properties can prevent these infections and improve clinical outcomes. In this study, borosilicate bioglass and chitosan composite scaffolds were prepared, and then the surface was modified with nano-zinc oxide. In vitro and in vivo experiments showed that the chitosan/borosilicate bioglass scaffolds have good degradation and osteogenic properties, while the oxidized Zinc scaffolds have better antibacterial properties.
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PubMed
高影响因子
Journal of Energy Storage
·
2022
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IF 8.907
Xiaorui Liu,Qingyu Wang,Bin Liu,Cheng Zhong,Wenbin Hu
Zinc–nickel battery attracts much attention because of their excellent rate performance and high operating voltage. However, their applications are strongly restricted by the poor cycling performance, which is caused by the degradation of the zinc anode during battery cycling. To overcome such limitation, a facile strategy to prepare homogeneously Bi 2 O 3 coated ZnO composites is proposed. The reaction is conducted in the liquid phase based on redox reaction of Bi 3+ and I − to directly grow BiOI on commercial ZnO powders, which are then converted to ZnO@Bi 2 O 3 by further heat treatment. Benefiting from the uniform Bi 2 O 3 coating, the solubility of ZnO is effectively reduced. The well-connected metallic Bi network is formed, which serves as the conductive substrate for uniform zinc deposition and hence inhibits the dendrites growth. The assembled zinc–nickel battery based on ZnO@Bi 2 O 3 composites exhibits significantly prolonged cycling life. Even under a high discharge current of 10 A (~ 138 mA cm −2 ), the battery can keep cycling during 400 cycles with discharge voltage higher than 1.1 V, which is extended by 3 and 1.7 times compared with that of electrodes based on pure ZnO and physical mixture of Bi 2 O 3 and ZnO. This work provides a facile strategy for synthesizing uniformly Bi 2 O 3 coated ZnO composites, which is helpful for large-scale synthesis of high-performance zinc anodes in practical application.
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JOURNAL OF MOLECULAR STRUCTURE
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2022
·
IF 3.841
Shuang Liang,Guanting He,Guozhe Sui,Jinlong Li,Dongxuan Guo,Ze Luo,Rongping Xu,Hong Yao,Chao Wang,Zhiyong Xing
Metal organic frameworks (MOFs) are considered as desirable precursors for the preparation of photocatalyst to improve photocatalytic hydrogen evolution efficiency due to the maintained special morphology. Herein, C-doped rod-like ZnO with porous structure has been successfully prepared by using ZIF-L as precursor via an optimized two-step calcination strategy, which is applied for photocatalytic hydrogen evolution reaction from water splitting. The results show that ZnO-350-450 exhibits the best photocatalytic activity with a hydrogen production rate of 0.35 mmol·g −1 ·h −1 , which is 1.9 times higher than that of ZnO-400 (0.184 mmol·g −1 ·h −1 ) under simulated sunlight illumination. The enhanced photocatalytic performance is attributed to the fact that the two-step calcination provides the regular porous rod-like structure (ZIF-L) and the inclusion of carbon in ZnO photocatalyst. C-doped ZnO with regular morphology offers faster charge transfer rate and higher charge separation efficiency, and the C-doped expands a wider range of light absorption. Overall, the presented work could provide a new idea for designing and preparing of photocatalysts with high efficiency for photocatalytic hydrogen production.
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高影响因子
Frontiers in Chemistry
·
2022
·
IF 5.545
Lu Hui,Sha Simiao,Li Tong,Wen Qian,Yang Shaolin,Wu Jiandong,Wang Kang,Sheng Zhilin,Ma Jinfu
Zinc oxide is a popular semiconductor used in catalysts due to its wide bandgap and high exciton binding energy. However, the photocatalytic performance of ZnO was compromised by its insufficient electron-hole separation efficiency and electron transfer rate. Herein, ZnO-reduced graphene oxide (rGO) composite solid catalyst was synthesized by one-step electrodeposition method on FTO substrate using lithium perchlorate (LiClO4) as the supporting electrolyte. Scanning electron microscopy, Raman, Fourier Transform Infrared, and XRD characterizations confirmed the deposition of ZnO and the reduction of graphene oxide Owing to the cooperative effect between rGO and ZnO, the as-prepared ZnO-rGO composites show much enhanced photocatalytic degradation ability compared with pure ZnO nanorods. By optimizing the conditions of electrodeposition of ZnO-rGO composites, the degradation rate of methylene blue can reach 99.1% within 120 min. Thus, the simple preparation and the excellent performance could endow the ZnO-rGO composites with promising application in practical dye-polluted water treatment.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2023
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IF 6.2
Yijie Wang,Hougang Fan,Xiaoyan Liu,Jian Cao,Huilian Liu,Xin Li,Lili Yang,Maobin Wei
Efficient electron transfer process and excellent CO 2 adsorption capacity are of great significance for improving CO 2 photoreduction efficiency. 3 D– 0 D ZnO/CsPbBr 3 S-scheme heterojunction hollow spheres were successfully prepared via a simple self-assembled process for efficient CO 2 photoreduction. Photocatalytic CO 2 reduction experiments showed that the ZnO/CsPbBr 3 had the excellent CO 2 photocatalytic conversion activity to CO, which was about 2.61 times higher than that of ZnO hollow micro-spheres and 1.9 times higher than that of pure CsPbBr 3 quantum dots (QDs). Photoelectrochemical characterization confirmed that the ZnO/CsPbBr 3 composite had good photoelectric conversion ability and carrier transfer ability, which was beneficial to the photocatalytic reaction. The suitable band gap structure and DFT calculation results showed that the formation of built-in electric field at the ZnO/CsPbBr 3 interface can greatly improve the S-scheme electron transfer ability, which can foster the CO 2 photoreduction. Besides, the introduction of 3D structure can improve the dispersion of CsPbBr 3 QDs and effectively enhance the CO 2 capture ability of the catalyst, which greatly promoted the CO 2 photoreduction reaction. The current work can present a novel S-scheme photocatalyst , which is looked forward to providing a certain perception into the advance of novel highly efficient CsPbBr 3 QDs-based photocatalysts for CO 2 resource utilization.
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IONICS
·
2023
·Vol. 29
·期 4
·1571-1578
·
IF 2.8
Zhang Sheng-Feng,Li Jing,Wei Mei-Jie,Kong Fen-Ying,Zhang Rui,Wang Zhong-Xia,Fang Hai-Lin,Wang Wei
Herein, a fast, inexpensive, and sensitive electrochemical approach for the quantification of 6-gingerol in the ginger samples was established. Au nanoparticles-ZnO-reduced graphene oxide (AuNPs-ZnO-rGO) nanocomposites were fabricated and employed as electrode-modified materials to improve the sensitivity of the determination. UV–visible (UV–vis), transmission electron microscope (TEM), and X-ray photoelectron spectroscopy (XPS) characterization elucidated the successful fabrication of AuNPs-ZnO-rGO nanocomposites. Voltammetry investigation demonstrated the excellent electrocatalytic activity of AuNPs-ZnO-rGO nanocomposites toward the redox reaction of 6-gingerol. Using the best experimental conditions (pH: 2.0 BR; the amount of AuNPs-ZnO-rGO suspension: 6 μL; accumulation time: 120 s), the linearity of the peak currents relied on the concentration of 6-gingerol from 0.1 to 100 μM with a detection limit of 0.03 μM (S/N = 3). The developed approach was successfully implemented for the quantification of 6-gingerol in ginger samples, with recoveries of 99.07‒102.1%.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2023
·
IF 5.2
Huayi Cai,Jingjing Wang,Zhao Du,Zhiyuan Zhao,Yaxin Gu,Zhonglu Guo,Yang Huang,Chengchun Tang,Guifeng Chen,Yi Fang
Photocatalysis has attracted much attention in the field of environmental remediation. However, the photocatalytic performance largely depends on efficient charge migration and solar light utilization. Herein, the ternary MoSe 2 /ZnO/p-BN (MZB) photocatalyst was successfully designed and synthesized. The degradation rate of the optimal sample 30 wt% MZB for ofloxacin (OFL) under visible light irradiation can reach 99.2%, and the photocatalytic reaction rate is 5.33 times and 2.10 times higher than that of pure ZnO and ZnO/p-BN. In the MoSe 2 /ZnO/p-BN system, p-BN can achieve the enrichment of pollutant to accelerate the catalytic rate, while the hybridization of MoSe 2 expands the spectral response of the catalysts. In addition, the formation of stepped electron transport routes reduces the electron-hole pair recombination rate. The active species quenching experiments reveal that e - , •O 2 − , h + and •OH play a major role in the removal of antibiotic contaminants. The analysis of OFL degradation intermediates reveals the possible degradation pathways and proposes a reasonable photocatalyst mechanism. Therefore, this work provides new ideas for designing high-performance visible light responsive photocatalysts for pollution treatment.
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JOURNAL OF RARE EARTHS
·
2023
·
IF 4.9
Boxu Xu,Chao Song,Jie Song,Rui Huang,Shaomin Lin,Zhenxu Lin,Yi Zhang,Dejian Hou,Jun Song
In this study, Er 3+ /Yb 3+ codoped Y 2 O 3 –ZnO ceramic phosphors were prepared by sol–gel method. The samples had two emission bands, namely, green (535 nm) and red (660 nm), which are attributed to Er 3+ : 2 H 11/2 ( 4 S 3/2 ) → 4 I 15/2 and Er 3+ : 4 F 9/2 → 4 I 15/2 radiative transitions , respectively. The samples exhibited green- and red-emission intensity enhancement by 1.728 and 2.286 times that of the pure Y 2 O 3 host, respectively and by 514.468 and 214.341 times that of the pure ZnO host. The emission intensities are first enhanced by lattice expansion. With the change of Y:Zn ratio, the high surface energy is converted into low crystal surface resulting in the change of asymmetry crystal field for matrix. When the intensity of the asymmetric crystal field reaches maximum, both emissions are further boosted. When the high surface energy transforms into crystal surface energy, the microstructure changes into a compact mesoporous structure. Consequently, the chemical stability of the samples improves significantly, and the final emission band of the three samples with mesoporous structures is continuously red.
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