SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Xueqin Yuan,Fei Pei,Xiaolin Luo,Huanting Hu,Huaming Qian,Pin Wen,Kangkang Miao,Sifan Guo,Wei Wang,Guodong Feng
Fabrication of heterojunction is an effective way of improving the photocatalytic performance of semiconductor in the photocatalytic wastewater treatment. ZnO/Au@Cu 2 O heterojunctions were successfully synthesised using Au nanoparticles loaded onto the surface of ZnO nanorods as heterostructural seeds to induce in situ growth of Cu 2 O shells. X-ray diffraction, transmission electron microscopy, scanning electron microscopy, X-ray photoelectron spectroscopy, electrochemical workstation and UV–vis diffuse reflection spectrograph were employed to analyze the structures, compositions and photoelectric properties of the synthesised photocatalysts. After 45–90 min of the photocatalysis of ZnO/Au@Cu 2 O heterojunctions under simulated sunlight, the degradation efficiencies of methyl orange and rhodamine B could reach 93.0% and 99.6%, respectively, which were much higher than those with mono- and bi-component catalysts. The photocatalytic system with ZnO/Au@Cu 2 O can achieve deep mineralization to decompose organic dye molecules into non-toxic products. The formation of heterostructures not only could expand the spectral absorption range to the visible region but also efficiently facilitate charge separation to transfer more photo-generated holes and electrons to generate oxidative hydroxyl and superoxide radicals. A Z-scheme charge separation mechanism was proposed according to the determination of radical species and energy band structures of ZnO–Cu 2 O.
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Nanoscale Research Letters
·
2020
·Vol. 15
·期 1
·1-12
·
IF 3.578
Qin Xiaoyun,Shi Dongdong,Guo Bowen,Fu Cuicui,Zhang Jin,Xie Qingqing,Shi Xiangdong,Chen Fenghua,Qin Xiaomei,Yu Wei,Feng Xiangli,Liu Yan,Luo Dan
One-dimensional (1D) nanomaterials with specific architectures have received increasing attention for both scientific and technological interests for their applications in catalysis, sensing, and energy conversion, etc. However, the development of an operable and simple method for the fabrication of 1D nanostructures remains a challenge. In this work, we developed an “anion-regulated morphology” strategy, in which anions could regulate the dimensionally-restricted anisotropic growth of ZnO nanomaterials by adjusting the surface energy of different growth facets. ZnO 1D necklace-like nanostructures (NNS) could be prepared through a hydrothermal treatment of zinc acetate and urea mixture together with a subsequent calcination procedure at 400 °C. While replacing the acetate ions to nitrate, sulfate, and chlorion ions produced ZnO nanoflowers, nanosheets and hexagonal nanoplates, respectively. Density functional theory calculations were carried out to explain the mechanism behind the anions-regulating anisotropic crystal growth. The specified ZnO 1D NNS offered improved electron transport while the grain surface could supply enlarged specific surface area, thus providing advanced photocatalytic ability in the following photodegradation of methyl orange (MO). Among the four photocatalysts with different morphologies, ZnO 1D NNS, possessing the highest catalytic activity, degraded 57.29% MO in the photocatalytic reaction, which was 2 times, 10 times and 17 times higher than nanoflowers, nanosheets and hexagonal nanoplates, respectively. Our work provides new ideas for the construction and application of ZnO 1D nanomaterials.
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2020
·Vol. 45
·期 6
·3095-3101
·
IF 3.288
Yilin Yin,Jingchao Liu,Zengnan Wu,Ting Zhang,Zenghe Li
As one of the most essential semiconductors, ZnO has been widely used for solar cells, photocatalysis, environmental remediation, etc. Doping and morphology control of ZnO can significantly improve the efficiency of its photocatalytic performance. Tetracycline hydrochloride (TC) is widely used in medical and veterinary fields. Its excess use harms the environment and human health. Herein, we have successfully prepared Cu2O-doped ZnO with a porous structure by calcination using ZIF-8 as the precursor. After exposure to visible light (λ >420 nm) for 75 min, these photocatalysts exhibited a reasonable TC degradation rate (∼83.6%). Compared with ZnO, the Cu2O-doped ZnO introduces a p–n heterojunction and increases oxygen vacancies, which reduces the band gap and electron–hole recombination. Therefore, the photocatalytic efficiency for TC and PEC performance have been improved.
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CRYSTENGCOMM
·
2020
·Vol. 22
·期 16
·2709-2717
·
IF 3.117
Xiaojuan Bai,Boxuan Sun,Xuyu Wang,Tianshuo Zhang,Qiang Hao,Bing-Jie Ni,Ruilong Zong,Ziyang Zhang,Xiaoran Zhang,Haiyan Li
Defects can influence the properties of photocatalysts, and defective ZnO has triggered broad interest and intensive studies for decades. However, the correlation between crystal planes and defects remains unclear. Here, we demonstrate that the (101) plane is superior in producing oxygen vacancies than the (100) plane in rod-like defective ZnO samples. While the optimum intensity of the crystal ratio, (101)/(100), approaches 1, the separation efficiency of electrons–holes is much enhanced. Furthermore, it is found that the (101) plane has stronger spontaneous adsorption and higher dissociation activity of H2O, which is conducive to the spontaneous formation of oxygen vacancies and eventually enhances the separation efficiency of electrons–holes. The charge difference also shows that the crystal boundary junctions could cause uneven charge distribution, inducing lattice polarization and boosting the charge separation of defective ZnO, which is helpful for improving the photocatalytic activities. As a new proposed mechanism, the relationship between defect engineering and crystal surface could provide inspiration for the design of special nanomaterials for the environment purification and energy fields.
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Nano Energy
·
2020
·
IF 16.602
Tao Yang,Hong Pan,Guo Tian,Binbin Zhang,Da Xiong,Yuyu Gao,Cheng Yan,Xiang Chu,Ningjun Chen,Shen Zhong,Lei Zhang,Weili Deng,Weiqing Yang
Piezoelectric-based wearable electronics promise potential applications in human physiological monitoring for disease prediction, diagnose and rehabilitation. Still, it is a big challenge to fulfill excellent compatibility and precisely monitoring of the complexly subtle physiological signals simultaneously. Here, we prepared a three-dimensional hierarchically interlocked PVDF/ZnO nanofiber-based piezoelectric sensor through epitaxial growing ZnO nano rods (NRs) on the surface of electrospun PVDF nanofibers, which enables the fiber-based physiological monitoring electronics (PME) of well flexibility and high gas permeability . Due to synergistic piezoelectric effect of the effectively deformed interlocked ZnO NRs and the uniformly orientated PVDF nanofibers with high electroactive phase, the sensitivities of PME in both pressing and bending modes have been greatly improved 6 times and 41 times than that of pure PVDF nanofibers respectively. On this basis, the designed PME can precisely detect the complexly subtle physiological signals of respiration, wrist pulse and muscle behavior. Moreover, a sensitive gait recognition system was successfully developed based on PME arrays. Therefore, this proposed fiber-based device provides an alternative strategy to monitor the human subtle physiological signals and demonstrates promising potential in the expanded application of healthcare and clinical diagnosis.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2020
·
IF 7.489
Qiming Luo,Huiliang Cao,Lanyu Wang,Xiaohan Ma,Xuanyong Liu
Cell-selective toxic titanium is highly desired in clinical dental practice. Herein, based on the in situ conversion of ZnO to ZnO@ZnS, nanorod-array structured coatings with a controllable release features of zinc (Zn), has been successfully fabricated by a two-step hydrothermal method to endow titanium surface with cell-selectivity, i.e. boosting the functions (attachment and migration) of human gingival fibroblasts (HGnFs) while acting against the invasion of pathogenic bacteria. The improved functions of HGnFs over the ZnO@ZnS nanorod-array were attributed to the material’s optimized zinc release, which was decreased from an order of 3.5 mg L −1 to about 0.3 mg L −1 (within the first week). But more importantly, this concentration still had a high antibacterial efficacy up to 100% (against both the S. aureus and E. coli , 10 7 CFU mL −1 ). This study demonstrated that a ZnO@ZnS nanorod-array coating could be a promising strategy to endow titanium dental implants with improved soft tissue sealing and effectively reduce peri-implantitis.
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Optoelectronics Letters
·
2020
·Vol. 16
·期 5
·355-359
·
IF 0
Bian Ming-jing,Zhang Hong-yan
In this work, we studied the effect of different pH values on morphology, band gap and photoluminescence (PL) properties of Eu 3+ /Tb 3+ co-doped ZnO prepared by coprecipitation method. Experimental results show that alkaline condition is more favorable for the doping of Eu 3+ and Tb 3+ ions which reduce the band gap and increases the PL intensity of UV emission (385 nm) and visible emission (400—600 nm) of ZnO. Gaussian deconvolution PL spectra show that the defects on the surface of ZnO are decreased when it is synthesized under alkaline conditions. Furthermore, both the intrinsic orange emission of Eu 3+ ions (611 nm) and the intrinsic green emission of the Tb 3+ ions (495 nm) of ZnO in this case are obtained at the same time. High intensity green and orange emission indicates that Eu 3+ /Tb 3+ co-doped ZnO is a promising PL material and has potential in emission devices.
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JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
·
2019
·
IF 3.261
Qinghua Weng,Xiaona Zheng,Siying Zhang,Lili Zhu,Qijie Huang,Penghui Liu,Xiaofen Li,Jie Kang,Zhizhong Han
In this work, ZnO flower-rod arrays (ZnO FRs) were prepared by chemical deposition method and sensitized with natural pigment. The main component of natural pigment was chlorophyll which was extracted from fresh Ficus lacor leaves with simple method. And then a photoelectrochemical (PEC) immunosensor was constructed based on the natural pigment sensitized ZnO FRs (NP-ZnO FRs) and used to detect alpha-fetoprotein (AFP). The results show that the absorbance spectrum of visible light is enhanced for NP-ZnO FRs compared with pure ZnO and the photocurrent is strengthened. The electron transfer is restricted at the interface of ZnO and AFP due to the insulativity of the protein, therefore, the photocurrent is changed. In the measurement range of 0.005–50 ng·mL −1 , the logarithm of the measured concentrations ( c ) has a good linear relationship with the output photocurrent of the immunosensor. The rapid and accurate detection of AFP by the developed PEC immunosensor is realized. Moreover, the PEC immunosensor has high stability and is used to test AFP in the serum of clinical patients. Compared with ELISA method, the result by the PEC immunosensor is reliable. It means that the proposed method has good applicability and this work pave a way to construct visible light PEC biosensor.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2019
·
IF 3.131
Xuesheng Liu,Xueli Li,Xuewei Liu,Sisi He,Junsu Jin,Hong Meng
To improve the photocatalytic performance of ZnO nanoparticles , based on the collective effect as electron sink of Ag and perfect two-dimensional (2-D) feature of graphene, Ag-ZnO-rGO nanoparticles were prepared by polyvinyl alcohol assisted freeze-drying and subsequent hydrothermal reduction method. Through photocatalytic degradation of methyl orange solution under UV irradiation , all as-prepared samples were assessed and compared with those of published works. The surface morphology , microstructure and optical property of materials were systematically studied by XRD , XPS , SEM , TEM and DRS , respectively. XPS and Raman spectra results confirmed that GO has successfully been reduced to rGO; SEM and TEM characterizations manifested that Ag-ZnO NPs were uniformly distributed in rGO with two-dimensional sheets structure; DRS characterization and Kubelka-Munk formula calculation illustrated that Ag-ZnO-rGO exhibited the smallest band gap and the best optical absorption performance. Moreover, the photocatalytic degradation results indicated that Ag-ZnO-rGO NPs combine the advantages of graphene and Ag which not only has significant adsorption but also maintains high photoreactivity.
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INTERNATIONAL JOURNAL OF ADHESION AND ADHESIVES
·
2022
·
IF 3.848
Mohd Talha,Qi Wang,Yucong Ma,Yuanhua Lin
This study aimed to evaluate the potential of an exclusive hybrid coating, based on a silane network, which was developed by sol-gel technique and embedded with nano ZnO to protect the corrosion of an AZ31 magnesium alloy intended for use as biodegradable implants . The coated substrates were subjected to various characterization techniques such as Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), scanning electron microscopy with energy dispersive X-ray (SEM-EDS) analysis, and contact angle measurements . The corrosion resistance of applied coatings were evaluated using potentiodynamic polarization, electrochemical impedance spectroscopy (EIS), and scanning electrochemical microscopy (SECM) in a PBS solution at physiological temperatures. The chemical composition of the coatings was examined using X-ray photoelectron spectroscopy (XPS). Atomic force microscopy (AFM) was carried out to examine the surface topography of the alloy after the polarization test. The results revealed that these coatings significantly improved the anti-corrosion behavior of AZ31 alloy . It was observed that a mixture of silanes offered superior corrosion protection performance owing to the development of a dense cross-linked layer that developed at the interface between the coating and the substrate. The existence of ZnO nanoparticles further enhanced the protective barrier characteristics of the coatings. The outcomes offer a novel approach to the design of hybrid silane coatings with suitable corrosion resistance for biodegradable Mg alloys used as implants.
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Frontiers in Chemistry
·
2022
·
IF 5.545
Hao Ruixin,Luo Shanshan,Wang Feiyan,Pan Xinyu,Yao Jing,Wu Jielian,Fang Haihong,Li Wenkui
ZnO quantum dots (QDs) have received much attention as biomarkers and drug delivery systems in cancer treatment, due to their low cost, ease of preparation, and pH-responsive degradation. However, its applications are limited by the low quantum yield and light absorption. In this work, a lanthanum-doped zinc oxide (La-ZnO) QDs-based drug delivery platform was constructed. The results show that 4% La doping is the most beneficial for improving the fluorescent properties of the ZnO QDs. After loading the drug, the cell activity was 15% at ZnO@DOX and 12% at La-ZnO@DOX. According to in vitro and in vivo experiment results, the La-ZnO QDs show enhancement of the antitumor effect. Dual enhancement of fluorescence and anti-tumor effects make La-ZnO QDs promising as a drug delivery system in cancer treatment.
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CRYSTAL RESEARCH AND TECHNOLOGY
·
2023
·Vol. 59
·期 1
·2300233
·
IF 1.5
Chengli Yao,Chen Chen,Yijin Yuan,Wenjuan Zhu,Wenqing Tai,Can Ding,Hongying Li
At present, the problem of environmental pollution is becoming increasingly serious. It is urgent to develop efficient catalysts to solve these problems. To obtain the functional characteristics of CaCO 3 and promote its application in coatings and photo-catalysis, ZnO/CaCO 3 particles are prepared by the solution co-precipitation method under the mediate of sodium dodecyl sulfate (SDS) through corresponding strategies. The structures and morphologies of samples are characterized by XRD, FT-IR, SEM, and TEM, respectively. Besides that, the photo-catalytic property of the desired product is also evaluated. The results indicate that SDS helps to induce the formation of porous structure. Through co-precipitation, ZnO particles uniformly load on porous calcium carbonate. ZnO/CaCO 3 particles are endowed with low-cost property and high catalytic performance under the synergistic effect of photo-catalytic properties and absorption abilities. This work established a simple way to produce the composite catalysts with low price and high photo-catalytic activity.
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