Nanomaterials
·
2023
·Vol. 13
·期 1
·214
·
IF 5.3
Liyun Yan,Jiahui Tang,Qing-an Qiao,Honglan Cai,Yuqi Dong,Juan Jin,Yanbin Xu,Hongwei Gao
Bi2MoO6was one of the important bismuth-based semiconductors with a narrow bandgap, and has been widely used in selective oxidation catalysts, supercapacitors, and energy-storage devices. A series of Bi2MoO6/ZnO composite photocatalysts with different mass ratios were synthesized by the hydrothermal method. The synthesized samples were characterized by XRD, PL, UV-Vis, SEM, TEM, XPS, and BET analysis techniques. Under visible light conditions, Methylene blue (MB) was used as the target degradation product to evaluate its photocatalytic performance. The results showed that the degradation rate constant of Bi2MoO6/ZnO (0.4-BZO) was about twice that of the traditional photocatalysis of ZnO. The Bi2MoO6/ZnO composite catalyst maintained stable performance after four consecutive runs. The high photocatalytic activity of Bi2MoO6/ZnO was attributed to the efficient electron transport of the heterojunction, which accelerates the separation of electron-hole pairs and reduces the probability of carrier recombination near the Bi2MoO6/ZnO heterojunction. Bi2MoO6/ZnO nanocomposites have potential applications in the field of photodegradation.Keywords:Bi2MoO6/ZnO nanocomposites;photocatalyst;degradation
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Nano Materials
·
2022
·
IF 6.14
Zi-Yao Chen,Wen-Zhu Shao,Wei-Jian Li,Xue-Yin Sun,Liang Zhen,Yang Li
Due to the strong surface energy and polarity, ZnO nanoparticles are prone to adsorbing the OH groups dissociated from water in the air, leading to easy agglomeration and hence deteriorating the dispersion of ZnO in composites. In this work, it has been theoretically and experimentally demonstrated that doping with lower electronegativity metallic ions is an effective strategy to suppress the agglomeration of ZnO nanoparticles. By calculating the adsorption energies and electronic structures of OH/M-doped ZnO configurations (M = Li+, Cu2+, Al3+), it was found that metallic ion doping with a lower electronegativity (in comparison to that of the host Zn2+) can efficiently reduce the adsorption of OH groups on the ZnO surface due to the lower effective bond order of M–O bonds. Guided by the theoretical results, various M-doped ZnO nanoparticles (M = Li+, Cu2+, Al3+) were prepared and characterized by X-ray photoelectron spectroscopy and a laser particle sizer, which confirmed that the lower the electronegativity of dopants, the lower the OH groups’ adsorbed amounts and aggregate sizes of M-doped ZnO nanoparticles. This work provides a general avenue to design the composition of M-doped ZnO nanoparticles for suppressing agglomeration and enhance the dispersion of ZnO in composites.
研究领域:
材料科学
·
表面化学
✓ 已验证
DOI
高影响因子
CHINESE JOURNAL OF CATALYSIS
·
2023
·
IF 16.5
You Wu,Yi Yang,Miaoli Gu,Chuanbiao Bie,Haiyan Tan,Bei Cheng,Jingsan Xu
Solar photocatalysis is a promising, green, and sustainable technique for the synthesis of H 2 O 2 . In this study, low-dimensional ZnO/ZnIn 2 S 4 S-scheme heterojunction photocatalysts are fabricated using electrostatic spinning and chemical bath deposition methods for the efficient photocatalytic production of H 2 O 2 . ZnO nanofibers loaded with 20 wt% ZnIn 2 S 4 exhibit a superior H 2 O 2 production rate of 928 μmol g −1 h −1 , which is more than four times higher than that seen in pristine hexagonal phase ZnO and ZnIn 2 S 4 . First-principles calculations and in-situ X-ray photoelectron spectroscopy reveal the charge separation and transfer mechanisms in the S-scheme heterojunction. The construction of the S-scheme heterojunction facilitates the spatial separation of charge carriers, and electrons and holes with higher redox abilities are retained. Photoelectrochemical and photoluminescence tests further show that the formation of an S-scheme heterojunction is beneficial for the separation of photoinduced charge carriers. Electrochemical tests and electron paramagnetic resonance measurements indicate that H 2 O 2 production is primarily via a two-step single-electron O 2 reduction path. This study provides a new approach for the construction of S-scheme heterojunction materials that can efficiently produce H 2 O 2 under solar irradiation.
研究领域:
材料科学
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环境科学
·
光催化技术
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2018
·
IF 6.735
Ning Li,Yu Tian,Jianhui Zhao,Wei Zhan,Jinying Du,Lingchao Kong,Jun Zhang,Wei Zuo
Efficient and selective capture of phosphate from wastewater is critical to inhibit water eutrophication and supplement phosphate sources. Adsorption, as a simple and environmental-friendly approach, can realize phosphate recovery from wastewater. In order to enhance capture efficiency, adsorption capacity and reusability, magnetic 3D Fe 3 O 4 @ZnO nanocubes with uniform active sites were tailor-designed by hydrothermal-atomic layer deposition method for phosphate removal from water under weak magnetic field (WMF). Ultrafast capture of phosphate (94.8% in 5 min) was achieved by Fe 3 O 4 @ZnO composite under WMF due to the improvement of surface area and electrostatic interaction. More importantly, the synergistic effect of Lorentz force and electrostatic attraction promoted the transfer of phosphate anions to Fe 3 O 4 @ZnO surface and pores in one step, breaking the adsorption limitation induced by intraparticle diffusion. Isotherms fitting indicated that multilayer adsorption occurred on Fe 3 O 4 @ZnO surface with superior adsorption capacity of 100.3 mg/g. Moreover, the Fe 3 O 4 @ZnO exhibited excellent selectivity competing with co-existing matters in wastewater. Mechanism exploration found that inner-sphere complexation by ligand-exchange played a major role in the adsorption process. This easily separable and recyclable adsorbent was demonstrated to be a promising candidate for efficient phosphate capture in real sewage. Also, this study provided a novel approach with WMF application in magnetic separable adsorption system for contaminants remediation.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Water Process Engineering
·
2025
·
IF 6.7
Chen Zhao,Yiheng Wang,Nianping Wang,Ruilin Chen,Rui Yin,Xiangxi Li
The in-situ growth of ZnO is often used to modify membrane surface for enhanced hydrophilic and antibacterial properties due to significant modification effect, simple process and low cost. Nonetheless, some polymer membranes (such as PVDF membrane) lack active sites for ZnO growth on their surfaces, resulting in a small number of particles and unstable binding. This study utilized PDA/PEI to modify PVDF membranes for adequate active sites to capture Zn 2+ ions via the chelation action. Thereafter, nano ZnO can be synthesized easily via the alkalization reaction and thermal breakdown of Zn 2+ . Upon improving the modification conditions, ZnO particles were evenly distributed on the PVDF membrane's surface, leading to a reduction in membrane pore size from 0.38 nm to 0.29 nm. The water contact angle of the ZnO/PDA-PEI modified membrane dropped from 130° to 19°, indicating a significant enhancement in hydrophilicity. The modified membrane demonstrated enhanced anti-fouling performance in the oil/water separation experiment, achieving a steady permeance of 298 L·m −2 ·h −1 ·bar −1 , which was sixfold that of the original membrane. In the antibacterial experiment, the modified membrane exhibited significant antibacterial efficacy against both E. coli and S. aureus .
研究领域:
材料科学
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环境工程
·
生物学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR STRUCTURE
·
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.
研究领域:
材料科学
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能源科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2015
·Vol. 74
·期 3
·718-725
·
IF 1.532
Huang Wenyi,Bai Dawei,Li Lijun,Wei Huidan,Shi Zhipeng,Cheng Hao,Li Yanqing
Abstract We reported here an improved method in ethanol producing controllable ultrasmall ZnO@PEG nanoparticles in large-scale. The growth process for bare ZnO and ultrasmall ZnO@PEG nanoparticles were monitored by the UV–Visible spectrum and the result of particles size distributions was coincident with other measurement techniques [dynamic light scattering and transmission electron microscopy (TEM)]. Comparing with the result of FT-IR, TGA characterization, PEG could be adsorbed at the surface of ZnO nanoparticles. The fourier transform analysis from the TEM images indicated that PEG coated at the surface of ZnO nanoparticles did not have a direct effect on the morphology of the nanoparticles grown within. As the same growth time and excitation wavelength, the ZnO@PEG nanoparticles were endowed with higher FL intensity than bare ZnO nanoparticles from the fluorescence characterization. The FL intensity could retain 91.0 % of its beginning intensity for 6 days in ethanol, which declared the ZnO@PEG had acceptable storage stability. When the ZnO@PEG nanoparticles were transferred to aqueous solution, a balance value was found for the FL intensity in 120 min. Interestingly, the colloidal solution can keep transparent for 6 months without aggregation at room temperature. The controllable ultrasmall ZnO nanoparticles may link molecular-scale materials forming larger dimensions nanomaterials with different physical and chemical properties. And more, this fast and simple method for preparing ultrasmall ZnO nanoparticles ethanol solution can be improved for further study about doped ZnO for functional coating and solvent. Graphical Abstract
研究领域:
材料科学
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化学
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Jia Jia,Rong-Kun Liu,Qian Sun,Jie-Xin Wang
ZnO nanoparticles with high safety and stability are often used as active ingredients in sunscreens to protect the skin from ultraviolet rays. However, ZnO nanoparticles are easy to agglomerate, which will significantly affect the ultraviolet absorption and bacteriostatic properties, and the reactive oxygen species induced by the photocatalytic activity may result in irreversible secondary damage to the skin. Herein, the ZnO nanoparticles are dispersed uniformly on the surface of latex particles, and these composite particles are used as shell materials to construct self-assembled colloidosomes by high-gravity technology, which can improve the application properties with synergistic enrichment of the hollow structure. The ultraviolet resistance of colloidosomes is significantly higher than that of the pure ZnO nanoparticles. The higher the loading capacity, the more obvious the inhibition effect of colloidosomes on the growth of Gram bacteria. Furthermore, the antioxidant anthocyanin is in situ encapsulated in colloidosomes, and at a concentration of 2 g/L, the high free radical scavenging rate of 78% can be achieved. The construction of multifunctional colloidosomes provides a route for sunscreen and cosmetics applications.
研究领域:
材料科学
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生物学
·
化妆品科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2020
·
IF 4.65
Peng Wang,Su-Zhen Wang,Ya-Ru Kang,Zhong-Sen Sun,Xue-Dong Wang,Yu Meng,Ming-Hui Hong,Wan-Feng Xie
Gas sensors based on metal oxide semiconductors have attracted great interest in the sensing of organic volatile compounds gas due to their easy fabrication, effective cost, and good stability. Herein, we rationally design ethanol gas sensors based on p -Bi2O3 and n -ZnO heterostructure with clear interfaces, which exhibit excellent response of 21.6 towards 100 ppm ethanol, wide concentration detection range from 1 to 500 ppm, working temperature as low as 175 °C, short response time of 7 s, and recovery time of 8 s at 100 ppm of ethanol. Moreover, the selectivity of Bi2O3/ZnO sensor towards ethanol is much better than that of other organic volatile gases. The relationship between the origin of superior sensing performances towards ethanol and the sharp interfaces of p -Bi2O3/ n -ZnO heterostructure are also systematically investigated. On the other hand, it is also demnostrated that the tetragonal phase β -Bi 2 O 3 has positive effect on the sensing performance of Bi 2 O 3 /ZnO composite.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF WUHAN UNIVERSITY OF TECHNOLOGY-MATERIALS SCIENCE EDITION
·
2022
·Vol. 37
·期 1
·32-37
·
IF 1.271
Yao Haiwei,Ma Han,Mao Rui,Qiu Jiayong,Chen Chunyu,Ju Dianchun
To solve the problem of the low added value Zn-containing rotary hearth furnace (RHF) dust, two deep eutectic solvents (DESs) were employed, such as choline chloride-urea (ChCl-urea) and choline chloride-oxalic acid dihydrate (CC—OA) solvent and Zn-containing RHF dust (water-washed) as the research target. Then, we prepared ZnO nanoparticles using two DESs or their combination, namely, ChCl-urea (Method A), CC—OA (Method B), first CC—OA and then ChCl-urea (Method B-A) and first ChCl-urea and then CC-OA (Method A-B), respectively. The effects of these methods on the properties of as-obtained precursors and ZnO nanoparticles were investigated in detail. The results indicated that the precursor obtained by Method A was Zn 4 CO 3 (OH) 6 ·H 2 O, and those by Methods B, B-A, and A-B were all ZnC 2 O 4 ·2H 2 O. Moreover, the decomposition steps of the last three methods were similar. The ZnO contents of 95.486%, 99.768%, 99.733%, and 99.76% were obtained by Methods A, B, B-A, and A-B, respectively. Methods A, B, and B-A led to the formation of spherical and agglomerated ZnO nanoparticles with normal size distributions, where Method B showed the best distribution with an average diameter 25 nm. The ZnO nanoparticles obtained by the Method A-B did not possess good properties.
研究领域:
材料科学
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环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Hongxing Wang,Yongping Hao,Chengbo Ru
Traditional power supply systems based on batteries, as ineffective payloads, significantly hinder the development of ignition systems. To eliminate the dependence on batteries, we developed a self-powered ignition system utilizing a piezoelectric nanogenerator (PENG) based on ZnO-doped polyvinylidene fluoride (PVDF) nanofibers with high β-phase content. When subjected to external mechanical stimulation, the output voltage of the PENG reaches 32 V, which can charge a 22 μF capacitor to 15 V within 200 s and then simultaneously light up five LEDs. A self-powered ignition circuit composed of subsystems for power harvesting, storage, and discharge is assembled to activate igniters such as Ni-Cr wire, Ni-Cr film, standard semiconductor bridge (SCB), high-resistance SCB and small-sized SCB. The energy conversion processes of the igniters, whether via electric explosion or electrothermal manner, complete within 2 μs to 0.5 ms and then successfully ignite nanothermites of Al/CuO, primary explosives of lead styphnate, or mixtures of potassium chlorate and lead thiocyanate. Subsequently, a pressed B/KNO 3 (BPN) pellet, either in contact with or separate from the igniter by up to 3.3 mm, can be successfully ignited, fulfilling the ignition and transmission functions of ignition trains. These results demonstrate that the self-powered ignition system can work reliably without batteries, which is conducive to the miniaturization and intelligence of initiators and pyrotechnic devices.
研究领域:
材料科学
·
能源工程
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Pan Li,Haifeng Hu,Gan Luo,Shuang Zhu,Lingju Guo,Peng Qu,Qi Shen,Tao He
Crystal facet engineering provides a promising approach to tailor the performance of catalysts because of the close relationship between the photocatalytic activity and the surface atomic and electronic structures. An in-depth understanding mechanism of crystal facet-dependent CO2 photoreduction is still an open question. Herein, two different types of porous ZnO nanocatalysts are used as model photocatalysts for the investigation, which are, respectively, with exposed {110} and {001} facets. The porous ZnO with an exposed {110} facet exhibits superior photocatalytic activity to the one with the {001} facet. Various influencing factors have been thoroughly studied both theoretically and/or experimentally, including light harvesting (i.e., band gap), reduction capability (potential of conduction band), crystallinity, CO2 adsorption ability, CO2 activation, and charge separation. The major influencing factors are eventually figured out based on the experimental and calculation results. The product selectivity and the influence of the hole scavenger can be explained too. Our work may pave a way for directing the future rational design of efficient photocatalysts for CO2 reduction.
研究领域:
材料科学
·
环境科学
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）