CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Yuanhang Feng,Zhao zhao,Ting Wang,Jiaming Li,Ming Xu,Hailiang Jiao,Chen Wang,Haibo Li,Ming Feng
Photocatalytic N 2 fixation is a promising and sustainable manufacturing process of ammonia (NH 3 ); however, the NH 3 production rate by this method is very low, thus severely restricting further application of this sustainable technology. Therefore, developing an efficient photocatalyst for N 2 fixation under mild conditions is urgently required. Herein, ferroelectric Bi 2 WO 6 materials with different surface oxygen defects were prepared, and the concentration of corresponding defects was controlled by adjusting the thermal reduction time. The abundant oxygen defects in Bi 2 WO 6 can provide more reactive sites to promote the effective adsorption of N 2 , and the photogenerated charge carrier can be efficiently separated benefiting from the internal electric field. These would weaken the N 2 triple bond and reduce the activation energy barrier for the conversion of N 2 to NH 3 under mild conditions. In the absence of sacrificial agents and cocatalysts, the optimized Bi 2 WO 6 with oxygen defects shows an indigenous NH 3 yield of 132.175 μmol·g -1 ·L -1 ·h -1 , which is more than two times higher than that of the original Bi 2 WO 6 . Surprisingly, the Bi 2 WO 6 with oxygen defects produced more than eight times NH 3 (471.13 μmol·g -1 ·L -1 ·h -1 ) than that of the original Bi 2 WO 6 when assisted by an external magnetic field, thus providing a new perspective for further enhancing the N 2 fixation performance.
研究领域:
材料科学
·
催化化学
✓ 已验证
DOI
高影响因子
ENVIRONMENTAL RESEARCH
·
2024
·
IF 7.7
Chenyang Liu,Wei Ju,Yili Wang,Shuoxun Dong,Xiaolin Li,Xiaoyang Fan,Siying Wang
For metal-based phosphate adsorbents, the dispersity and utilization of surface metal active sites are crucial factors in their adsorption performance and synthesis cost. In this study, a biochar material modified with amorphous Zr–Ce (carbonate) oxides (BZCCO-13) was synthesized for the phosphate uptake, and the adsorption process was enhanced by magnetic field. The beside-magnetic field was shown to have a better influence than under-magnetic field on adsorption, with maximum adsorption capacities (123.67 mg P/g) 1.14-fold greater than that without magnetic field. The beside-magnetic field could also accelerate the adsorption rate, and the time to reach 90% maximum adsorption capacity decreased by 83%. BZCCO-13 has a wide range of application pHs from 5.0 to 10.0, with great selectivity and reusability. The results of XPS and ELNES showed that the "magnetophoresis" of Ce 3+ under the magnetic field was the main reason for the enhanced adsorption performance. In addition, increased surface roughness, pore size and oxygen vacancies , enhanced mass transfer by Lorentz force under a magnetic field, all beneficially influenced the adsorption process. The mechanism of phosphate adsorption by BZCCO-13 could be attributed to electrostatic attraction and CO 3 2– dominated ligand exchange. This study not only provided an effective strategy for designing highly effective phosphate adsorbents, but also provides a new light on the application of rare earth metal-based adsorbent in magnetic field.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMOSPHERE
·
2017
·
IF 4.208
Tao Zhou,Ke Feng,Wei Xiang,Yiliang Lv,Xiaohui Wu,Juan Mao,Chang He
In this study, significant synergistic degradation of antibiotic diclofenac (DCF) was demonstrated in a novel magnetic field (MF) enhanced zero-valent iron (ZVI)/EDTA Fenton-like system. Five operational parameters, namely, initial ZVI loading, pH, EDTA dosage, DCF concentration and reaction temperature, were investigated for their effects on the DCF degradation. OH was identified as the predominant reactive oxygen species for DCF degradation in ZVI/EDTA systems whether in the presence or absence of MF. DCF molecule can be oxidized by OH, attacking via the hydroxylation and substituted dechlorination of the chlorinated aromatic ring, as well as by dehydration between the N atom and the acetoxyl. It could also be directly dechlorinated by ZVI reduction simultaneously. The reaction mechanism and promotional role of MF in the MF/ZVI/EDTA system were proposed. It is suggested that MF mainly alters the heterogeneous ZVI surface-bond reactions and accelerates the surface corrosion depending on the presence of pristine iron oxides layer, but MF does not change the homogeneous iron cycle and the Fenton-like reactions.
研究领域:
环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
CRYSTENGCOMM
·
2020
·Vol. 23
·期 3
·694-699
·
IF 3.117
Muhammad Usman Amin,Lingling Zhang,Rui Hao,Dongjie Zhang,Hongjun You,Jixiang Fang
We successfully prepared silver dendritic nanostructures with a well-defined and precisely tailored trunk and branches, as well as decorated nanoparticles, by a simple and controllable two-electrode electrochemical deposition system using different AgNO3 concentrations and deposition potentials. The prepared nanostructures are used as SERS substrates for the detection of crystal violet molecules with a minimum detection limit of 10−11 M. Finite-difference time-domain (FDTD) simulation is used to analyze the SERS activity of diverse silver dendritic nanostructures. The SERS and FDTD results revealed that the pine leaf-like structure displays excellent sensitivity and reproducibility compared to all other structures due to a large number of hotspot sites between branch–branch and branch–particle junctions. This article provides a good understanding of electromagnetic field enhancement and shows that various silver dendritic nanostructures could be potential candidates for SERS-based detection.
研究领域:
材料科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2018
·
IF 6.735
Jianhui Zhao,Ning Li,Ruixin Yu,Zhiwei Zhao,Jun Nan
It is difficult to achieve concurrent removal of nitrate (NO 3 − -N) and ammonia (NH 4 + -N) from water thoroughly by photocatalysis due to their opposite charges and inappropriate potentials of photo-induced carriers. Herein, an innovative magnetic field enhanced 3D/2D Mn 2 O 3 /g-C 3 N 4 photocatalytic system was developed for denitrification from NO 3 − -N and NH 4 + -N contaminated water under visible light. High removal efficiency of 94.5% and 97.4% for NO 3 − -N and NH 4 + -N were achieved after imposing magnetic field. Impressively, the extra magnetic field integrated the advantages of providing driving force for NO 3 − -N and NH 4 + -N approaching catalyst surface as well as facilitating separation of photo-induced charge carriers in newly-formed II type heterojunction by generating Lorentz force . Interestingly, the electrons on conduction band of g-C 3 N 4 could reduce NO 3 − -N to NO 2 − -N, N 2 and NH 4 + -N. Subsequently, the produced NO 2 − -N could be reduced to N 2 and NH 4 + -N. Meanwhile, the holes on valence band of Mn 2 O 3 could convert NH 4 + -N to N 2 selectively, which made the dominate contribution to high N 2 recovery (93.2%) during photocatalysis. Moreover, the reusable Mn 2 O 3 /g-C 3 N 4 achieved efficient denitrification under magnetic assisted photocatalysis in real water backgrounds such as tap water and river water. This study provided an efficient and promising strategy for nitrogen remediation from water.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Sensors
·
2022
·
IF 9.618
Haoming Sun,Meng Cao,Pinhua Zhang,Xiaojing Tian,Manli Lu,Lulu Du,Kaifeng Xue,Guangliang Cui
Magnetism is a promising external intervention for gas sensitivity based on a heterogeneous interfacial structure caused by the regulation of the heterogeneous interface conductivity and the surface oxygen adsorption. In this study, Cu2O/NiO heterostructure-ordered nanoarrays were prepared with a two-dimensional (2D) electrodeposition in situ assembly method for H2S gas detection at room temperature under the action of a magnetic field. The nanoarrays were multibarrier structures with a strictly periodic structure that was greater than hundreds of microns in size. The experimental data confirmed that the response of 50 ppm of H2S based on the nanoarrays was improved by nearly 61% with a relatively weak magnetic field. Particularly at a low concentration (≤20 ppm), the effect of the magnetic field enhancement on the sensitivity was more obvious. We attributed the enhancement of the gas sensitivity with the magnetic field to the regulation of the Cu2O–NiO interface conductance and the surface oxygen adsorption. This study demonstrated that a magnetic field could significantly enhance the gas sensitivity based on heterostructures. Results of this study provide an important reference for the application of magnetism in gas detection and the design of new gas-sensitive materials.
研究领域:
材料科学
·
传感器技术
·
物理化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Bo Ma,Jinglei Bi,Jian Lv,Chuncai Kong,Pengxu Yan,Xintian Zhao,Xiaojing Zhang,Tao Yang,Zhimao Yang
Constructing the heterostructure with noble metals on semiconductors is recognized as a prospective approach to enhance hydrogen generation. In this study, Au-Cu 2 O heterostructure particles (HPs) with unique inter-embedded heterostructures were controllably fabricated by a universal reaction between Cu particles and HAuCl 4 solution. Besides, the boosted catalytic performance from the plasmon effects, Au-Cu 2 O inter-embedded heterostructure exhibits additional structural advantages to promote the photocatalytic property of hydrogen generation overall water splitting. Under the visible light, the H 2 evolution rate of the Au-Cu 2 O HPs is 152 and 22 times higher than that of pure Cu 2 O and traditional Cu 2 O@Au HPs with Au anchored on the surface of Cu 2 O, respectively. On one hand, inter-embedded heterostructure brings more contact areas as the active sites to carry out the direct electron transfer and electromagnetic transfer for the reduction. On the other hand, the finite difference time domain (FDTD) simulations indicate that enhanced electromagnetic fields of Au-Cu 2 O HPs form a netlike structure to maximumly accelerate the transfer of hot electrons and separate the electron–hole pairs. Under the joint action of the two, the inter-embed heterostructure exhibits superior photocatalytic property, demonstrating that this study could instruct the design of other metal–semiconductor photocatalysts.
研究领域:
材料科学
·
能源科学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
Nanoscale Research Letters
·
2017
·Vol. 12
·期 1
·1-7
·
IF 2.833
Wang Jianchao,Luo Hongsheng,Zhang Minghai,Zu Xihong,Li Zhiwei,Yi Guobin
Silver nanowires (AgNWs) were chemically etched to significantly increase the surface roughness and then self-assembled on the liquid/gas interfaces via the interfacial assembly method to obtain aligned chemically etched silver nanowire films. The as-fabricated silver nanowire films were used as novel surface-enhanced Raman scattering (SERS) substrates. The morphologies and plasmon characteristics of the substrates were investigated using multiple measurement methods. The performance of as-fabricated substrates was measured using rhodamine B as a probe. The detection limitation can be as low as 10 −11 M. The greatly improved plasmonic properties are attributed to the efficient light coupling and larger electromagnetic field enhancement. The novel set of SERS substrates of aligned chemically etched AgNWs is believed to be important for efficient, homogeneous, and ultrasensitive SERS sensing applications.
研究领域:
材料科学
·
分析化学
✓ 已验证
DOI
高影响因子
Nanoscale Research Letters
·
2019
·Vol. 14
·期 1
·1-9
·
IF 3.159
Dong Jun,Zhao Xing,Gao Wei,Han Qingyan,Qi Jianxia,Wang Yongkai,Guo Sandong,Sun Mengtao
The unique photonic effect of self-assembled metal nanoparticles is widely used in many applications. In this article, we prepared self-assembled gold nanorod (GNR) vertical arrays substrate by an evaporation method and found that the morphology of the substrate can be effectively regulated by changing the immersion time in the target molecules solution to obtain different Raman enhancement effects. We separately calculated the local electromagnetic field of the GNR vertical arrays and disorder substrate by the finite element method (FEM), which was consistent with the experimental results. Based on optimal soaking time, the sensitivity, reproducibility, and stability of substrates were separately studied. The experimental results show that the GNR vertical arrays can detect Rhodamine 6G (Rh6G) at concentrations as low as 10 −11 M and exhibit good reproducibility and stability due to local electromagnetic (EM) field enhancement caused by the coupling of adjacent nanorods. Thus, our work can demonstrate that the substrate has excellent surface-enhanced Raman scattering (SERS) activity and the obtained GNR vertical arrays have great potential for biosensor and biodetection.
研究领域:
纳米技术
·
光学
·
材料科学
·
生物医学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Materials
·
2022
·Vol. 16
·期 1
·387
·
IF 3.748
Kezhu Xu,Qunling Fang,Jing Wang,Ailing Hui,Shouhu Xuan
Due to the abuse of antibiotics, the sensitivity of patients to antibiotics is gradually reduced. This work develops a Fe3O4@SiO2@Au/PDA nanochain which shows an interesting magnetic-field-induced improvement of its photothermal antibacterial property. First, SiO2was wrapped on Fe3O4nanospheres assembled in a chain to form a Fe3O4@SiO2nanocomposite with a chain-like nanostructure. Then, the magnetic Fe3O4@SiO2@Au/PDA nanochains were prepared using in situ redox-oxidization polymerization. Under the irradiation of an 808 nm NIR laser, the temperature rise of the Fe3O4@SiO2@Au/PDA nanochain dispersion was obvious, indicating that they possessed a good photothermal effect. Originating from the Fe3O4, the Fe3O4@SiO2@Au/PDA nanochain showed a typical soft magnetic behavior. Both the NIR and magnetic field affected the antimicrobial performance of the Fe3O4@SiO2@Au/PDA nanochains.Escherichia coliandStaphylococcus aureuswere used as models to verify the antibacterial properties. The experimental results showed that the Fe3O4@SiO2@Au/PDA nanochains exhibited good antibacterial properties under photothermal conditions. After applying a magnetic field, the bactericidal effect was further significantly enhanced. The above results show that the material has a broad application prospect in inhibiting the growth of bacteria.
研究领域:
材料科学
·
生物医学工程
·
微生物学
✓ 已验证
DOI
高影响因子
Plasmonics
·
2016
·Vol. 12
·期 6
·1841-1845
·
IF 2.146
Zhang Mingdi,Ren Zebin,Dong Jun,Wang Zhaojin,Han Qinyan,Zhang Chenyun,Zheng Hairong
A two-dimension distributed metallic nanostructure substrate containing two-dimensional array of Au nanorods with different configurations is prepared via a self-assembly method. Enhanced fluorescence emission with assembled substrate is investigated by employing Rhodamine 6G as probe molecule. The experimental observation shows that the prepared nanostructure substrate has strong fluorescence enhancement effect and the enhancement effect critically depends on the configuration of the particle distribution. The study demonstrates that the local electromagnetic field enhancement around the gold nanorod array plays an important role in achieving fluorescence enhancement with the assembled substrate array. This work suggests that the assembled substrate can be considered as a potential candidate for effective enhancement application.
研究领域:
纳米技术
·
光学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2020
·Vol. 20
·期 4
·2079-2086
·
IF 1.134
Hu Xiangna,Bian XingZhong,Yu Shaozhou,Dan Kun
A magnetic Fe3O4@SiO2@Ag@COOH nanoparticle (NPs)/Au film was fabricated as an effective surface-enhanced Raman scattering (SERS) substrate through a combination of a solvothermal reaction, the Stöber method and an in-situ reaction. The superparamagnetic
property of Fe3O4@SiO2@Ag and the decoration with –COOH groups allow efficient enrichment and capture of thiabendazole molecules. A large quantity of sub-10 nm gaps emerge when Ag NPs are decorated on the surface of the SiO2 shell, offering
a dramatic electromagnetic field enhancement induced by localized surface plasmon resonance (LSPR). Finite-difference time-domain (FDTD) simulations show that strong near-field enhancement around the gap areas between the Ag NPs and Au film occurs, which is caused by the coupling between the
LSPR of the Ag NPs and surface plasmon polaritons (SPPs) of the Au film. Due to the superparamagnetic property and high electromagnetic field enhancement, the Fe3O4@SiO2@Ag@COOH NPs/Au film as a SERS substrate can detect 1 μg/L thiabendazole in solution,
showing great potential for SERS detection of environmental pollutants.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）