CRYSTENGCOMM
·
2016
·Vol. 18
·期 34
·6513-6519
·
IF 3.849
Yuhang Wu,Congyan Li,Kaiwen Zhou,Yanhong Zhao,Xiaojing Wang
A novel catalyst, CeO2@Ag/Ag2Ta4O11, was successfully assembled via an in situ catalytic process for 4-nitrophenol reduction. As-prepared samples were characterized using high-resolution transmission electron microscopy (HRTEM), X-ray diffraction (XRD), X-ray spectroscopy (XPS), and ultraviolet-visible diffuse reflection spectroscopy (DRS). The results showed the elementary substance Ag was produced from Ag2Ta4O11 after a circular reduction reaction and was homogeneously deposited on the surface of Ag2Ta4O11 nanoparticles, which were wrapped by octahedron-shaped CeO2. The as-prepared nanocomposites exhibited extremely accelerated catalytic activity toward the efficient reduction of 4-nitrophenol compared to pure CeO2 and Ag2Ta4O11 nanoparticles. 15 rounds of recycling experiments confirmed that the samples exhibited good reuse stability, assigned to the confined robust shield of CeO2. The shell of CeO2 efficiently prevented undesirable aggregation and leaching of Ag nanoparticles. The persistent ascending activity with an increasing number of experimental runs was related to the amount of metallic Ag gradually growing. Moreover, it was proposed that the active interfacial contact between ceria oxide/metallic Ag/the semiconductor Ag2Ta4O11 (CeO2@Ag/Ag2Ta4O11) in the core–shell structure facilitated the transfer of electrons, contributing to the enhanced activity.
研究领域:
材料科学
·
环境化学
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Zhaoyang Li,Yongjie Zhao,Qing Guan,Qian Liu,Sara Khan,Leilei Zhang,Xianze Wang,Lei Chen,Xia Yang,Mingxin Huo
Photocatalytic reduction of nitrate has attracted much attention recently, however, low efficiency and difficult separation have limited its application in practice. In this study, the novel direct dual Z-scheme AgBr(Ag)/MIL-101(Cr)/CuFe 2 O 4 (AB/M/CFO) was fabricated by the hydrothermal technology combined with the photodeposition method for the first time. The AB/M/CFO exhibited the highest nitrate conversion and nitrogen selectivity (79.9% and 94.5%, respectively) compared to AgBr(Ag)/MIL-101(Cr), MIL-101(Cr) and CuFe 2 O 4 for 30 min UV-light irradiation. The dual Z-scheme of AB/M/CFO enhanced electron transfer and charge separation, which was proved by transient photocurrent responses, leading to a significant improvement in photocatalytic efficiency. Meanwhile, after four cycles, the AB/M/CFO photocatalyst also displayed a strong magnetic separation ability and excellent recycling stability. Furthermore, the excitation and electron transfer process over dual Z-scheme AB/M/CFO photocatalytic material were proposed, based on the radical trapping experiments. Our work provides a new strategy to construct dual Z-scheme MOFs-based materials that have promising applications in photocatalytic reduction of pollutants.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
TALANTA
·
2024
·
IF 5.6
Yan Su,Pengfei Gao,Guomei Zhang,Ying Zhou,Lihong Shi,Jianlin Wu,Wenting Liang,Shaomin Shuang,Yan Zhang
In this study, the N-Acetyl- l -Cysteine (NAC)-capped gold and silver bimetallic nanoclusters (NAC@Au–Ag NCs) was synthesized by reflux method. Due to the silver effect, the NAC@Au–Ag NCs exhibited strong photoluminescence at far-red/near-infrared regions and better catalytic performance than Au or Ag NCs. Upon addition of H 2 S, the Au–Ag NCs exhibited obvious fluorescence quench and color changes through the generation of metal sulfides and a static quenching process. The Au–Ag NCs displayed a wide linear luminescence response for H 2 S (18.5–217 μmol/L) with a detection limit of 0.269 μmol/L. Moreover, the visible color of Au–Ag NCs changed from white to brown-yellow along with increased H 2 S, the corresponding RGB values also displayed good linearity with the concentration of H 2 S (90.1–678 μmol/L). Notably, the fabrication of test strips provided a convenient and intuitive tool to screen the freshness of eggs by the color change of test strips. Au–Ag NCs could be used for living HeLa cells bioimaging and recognition of H 2 S abnormalities. Furthermore, it can be used as a catalyst to reduction of nitrophenols (NPhs), specific included 2NP, 3NP and 4NP. The reaction was regarded as a pseudo-first-order kinetic reaction due to the presence of excess NaBH 4 . At 298K, the catalytic rate constants(k) of 2NP, 3NP and 4NP were 0.1754 min −1 , 0.1734 min −1 and 0.2782 min −1 , respectively. The NAC@Au–Ag NCs catalyst still showed good catalytic activity and reusability after five cycles. Therefore, this study developed a H 2 S sensor for food samples and biological systems. And this nanocatalyst had great application potential for removed the nitrophenol pollutants in water.
研究领域:
分析化学
·
生物医学工程
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Haiyin Zhan,Chenxu Li,Zixuan Cao,Ruiren Zhou,Simiao Zhang,Ziyu Guo,Qixing Zhou
Y 2 O 3 is a cost-effective and environmentally friendly wide-band gap photocatalyst with extensive application potential. However, its limited ability to be excited by visible light restricts its practical uses. In this study, we coupled the narrow bandgap semiconductor AgI with Y 2 O 3 to form a Z-scheme heterostructure , significantly promoting its photocatalytic degradation activity. Characterization and experimental results demonstrated the formation of Y-O-Ag bonds through coupling with AgI, leading to an increase in oxygen vacancies in Y 2 O 3 , which promotes the chemisorption of H 2 O and O 2 . The Y-O-Ag bond introduction promotes electron transfer , improves hole utilization, and boosts energy transfer efficiency, thus promoting the efficient generation of ·OH and 1 O 2 . The photocatalytic degradation rates of RhB and o-nitrophenol by 7.5% AgI/Y 2 O 3 were 26.5 and 4 times higher than those of pure Y 2 O 3 , respectively. This study provides theoretical support for the Z-scheme heterojunction to improve photocatalytic activity and offers efficient solutions and practical design ideas for sewage purification.
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
Nanoscale
·
2025
·
IF 5.1
Jiasheng Wang,Tianyu Zhang,Jiliang Song,Fengxin Zhang,Hong Liu,Wan-Hui Wang,Ming Bao
Unsaturated alcohols (UOLs) are important fine chemical intermediates. Thus, it is of great significance to design and prepare catalysts for highly selective hydrogenation of CO of α,β-unsaturated aldehydes (UALs). In this paper, a fluffy mesoporous Al2O3-supported Ag–In2O3 catalyst (Ag-In2O3/f-m-Al2O3) was synthesized by employing a two-solvent method, in which Ag and In2O3 form a Mott–Schottky junction and lead to electron transfer from In2O3 to Ag. Electron-rich Ag repels the CC bond owing to “four-electron repulsion”, and electron-deficient In2O3 acts as the electrophilic site to adsorb the O atom of the CO bond, thus improving the selectivity towards UOLs. In addition to a larger specific surface area and smaller mass transfer resistance, the fluffy mesopore Al2O3 exhibits a large number of Lewis acid sites, which can further improve UOL selectivity. With the help of Ag–In2O3/f-m-Al2O3, high UOL selectivity can be obtained from UALs containing aliphatic, aromatic and heterocyclic groups. This elaborate design of the catalyst could contribute to the highly selective hydrogenation of UALs to UOLs.
研究领域:
催化化学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Coatings
·
2025
·Vol. 15
·期 3
·267
·
IF 2.8
Junyu Liu,Hansheng Li,Wencan Cui,Shihua Sang,Liang Guan,Chen Zhao
This study focuses on the preparation of a highly active surface-enhanced Raman spectroscopy (SERS) substrate, where Ag nanoparticles synthesized by the Lee–Meisel method are loaded onto the surface of GO@PVP nanoparticles through classical electrostatic attraction. The substrate was characterized by SEM and XPS analysis. The SERS-active substrate was utilized for the detection of phenanthrene in aqueous solutions, achieving a detection limit of 10−8g/L (5.6 × 10−11mol/L). In comparison to conventional Raman spectroscopy, this method exhibits a significant reduction in the detection limit and holds promise for trace polycyclic aromatic hydrocarbons (PAHs) monitoring in environmental samples.
研究领域:
材料科学
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环境科学
·
分析化学
✓ 已验证
DOI
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 97
·94682-94686
·
IF 3.289
Li Liu,Jie Zhao,Wei-Hua Li,Xiao-Ying Zhang,Hui-Zhong Xu,Kai Li,Yan Kai,Li-Shui Sun,Chao-Qin Li,Fa-Qian Liu
An effective strategy to improve the conductivity of MnO2-based electrodes is to combine them with some conductive materials, such as metal or carbon-based materials. In this work, Ag nanoparticles decorated MnO2/Sulfonated Graphene composite with 3D macroporous structure (3D Ag–MnO2/SG) was synthesized and their performance as electrode material in supercapacitors was studied. The improved conductivity and the elaborate design of 3D porous structure allowed the 3D Ag–MnO2/SG electrode to possess enhanced electrochemical performance. For example, the electrochemical testing results demonstrated that the 3D Ag–MnO2/SG presents a capacitance of 537 F g−1 at 0.5 A g−1, which is much higher than that of MnO2 (∼172 F g−1). Moreover, the 3D Ag–MnO2/SG electrode delivers a higher capacity retention rate in high current density and smaller charge transfer resistance than that of MnO2, which is contributed by the synergistic effect from the Ag nanoparticles and the 3D porous SG.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2022
·Vol. 106
·期 2
·444-454
·
IF 2.606
Zhang Ji,Mu Chengfa,Shen Tao,Qi Gengxin
Different micro-structured SnO 2 powders were synthesized by hydrothermal and chemical co-precipitation methods. The influence of milling process and sintering parameters on the physical properties of Ag/SnO 2 electrical contact materials was investigated. The microstructure and physical properties of Ag/SnO 2 electrical contact materials were characterized by X-ray Diffraction, Scanning Electron Microscopy and Conductivity analyzer. The results showed that spherical SnO 2 (s) powders with a diameter about 2 μm were synthesized. With increased milling time, there was a slight decrease in the average sizes of Ag/SnO 2 (s) powders, but no significant difference. The optimal density of 9.545 g∙cm −3 and resistivity of 2.67 μΩ∙cm of Ag/SnO 2 (s) electrical contact materials were obtained after sintering at 860 °C for 6 h in air atmosphere. The promotion of sintering densification and improvement of physical properties of Ag/SnO 2 (s) contact may be due to the combined effects of mechanical activation energy and higher sintering temperature. Using the finite element method, simulation models were developed to interpret the effects of different micro-structured SnO 2 powders on the physical properties of Ag/SnO 2 materials.
Graphical abstract
研究领域:
材料科学
·
电气工程
✓ 已验证
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2017
·
IF 0
Lei Wang,Jafar Ali,Changbo Zhang,Gilles Mailhot,Gang Pan
High throughput of polyacylonitile (PAN)-based Ag/TiO 2 composite nanofibers were prepared by using needleless electrospinning method. The morphology and crystallinity characterization revealed uniform and smooth nanofibers with an average diameter ranged from 160 to 260 nm. The enhanced photocatalytic activity of PAN/Ag/TiO 2 compared with PAN/TiO 2 nanofibers under visible light irradiation was linked with high interfacial charge transfer and low bandgap due to Ag entity. High photodegradation efficiency for methyl orange, rhodamine B and methylene blue were achieved as 99.5%, 92% and 99% respectively during the 4 h experiment. Effect of key parameters (i.e. pH, oxygen and Ag/TiO 2 loading dosage) on photodegradation efficiency of dyes were also investigated. Active species trapping experiments demonstrated that O 2 − and OH were dominant active species in the photocatalytic degradation of dyes. These composite nanofibers have also exhibited excellent antibacterial activity, e.g. 95% of E. coli and 99% of S. aureus were killed in 2 h. Bifunctional nanofibers can be easily recovered from the aqueous solution as compared with the TiO 2 nanoparticles. Moreover, the daily production rate of nanofibers has reached over 1.4 kg in the laboratory test, which is 60 times higher than that using the single needle electrospinning method. This production rate may be further optimized in the pilot scale studies. High productivity and strong catalytic properties of nanofibers propose their potential applications in environmental remediation for economically and eco-friendly wastewater and air treatment materials.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2024
·Vol. 31
·期 16
·23822-23838
·
IF 0
Yu Heng,Zhang Hongliang,Zhang Chenyang,Sun Wei,Han Mingjun,Wang Rong,Wei Xin,Li Songjiang
The rapid development of industrial society is also accompanied by the generation of a large amount of heavy metal wastewater, which has caused serious harm to the ecological environment and human society. Natural sphalerite has an important value in the environmental field due to its own semiconducting properties. In order to effectively remove Ag + from wastewater containing silver, this study develops a natural mineral-based Ag + adsorbent material (sphalerite) based on elemental affinity qualities and mineralization principles. The results of batch experiments showed that the initial Ag + concentration of 50 mg/L reduced to 0.094 mg/L with a reaction duration of 15 min, a sphalerite dose of 5 g/L, an initial particle size of −400 mesh (38 μm), a reaction temperature of 25 °C, and a pH of 5. The highest adsorption capacity is 19.77 mg/g, and the adsorption behavior is consistent with the Freundlich isotherm model and pseudo-second-order adsorption kinetics. The results of solution chemical analysis indicate that the presence of Ag + is primarily influenced by the presence of S 2− . Further analysis using SEM-EDS, FTIR, and XPS techniques reveals that Ag + is chemically adsorb onto the mineral surface, resulting in the formation of Ag 2 S. DFT calculations further confirm the overlap between the Ag 4d orbitals and the S 3p orbitals on the surface of sphalerite, further confirming its chemical adsorption. Mulliken populations suggest that charge transfer occurs between Ag + and S atoms in the sphalerite surface. This research systematically reveals the Ag + adsorption mechanism on sphalerite surface and expands research ideas for treating heavy metal wastewater.
研究领域:
环境科学
·
材料科学
·
化学工程
·
物理化学
·
计算化学
✓ 已验证
DOI
Nanoscale
·
2014
·Vol. 6
·期 14
·8155-8161
·
IF 6.739
Dan Zhu,Zhuyuan Wang,Shenfei Zong,Hui Chen,Xin Wu,Yuwei Pei,Peng Chen,Xueqin Ma,Yiping Cui
A liposome–Ag nanohybrid has been demonstrated as a SERS traceable intracellular drug nanocarrier. Liposomes have been introduced for their special qualities in drug delivery systems. In essence, 4-aminothiophenol (4ATP) tagged Ag nanoparticles (Ag@4ATP) were adsorbed onto the surfaces of liposomes via electrostatic interactions, in which 4ATP was used as a SERS reporter. In such a nanohybrid, the locations of the carrier can be tracked by SERS signals while those of the drugs can be monitored through their fluorescence, allowing the simultaneous investigation of the intracellular distribution of both the carriers and the drugs. Our experimental results suggest that the reported liposomal system has substantial potential for intracellular drug delivery.
研究领域:
纳米技术
·
药学
·
生物医学工程
·
细胞生物学
✓ 已验证
DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Jie Yu,Dan Zhu,Cong Qi,Wenjie Zhang,Lin Liang
To improve the ability of the medium to capture solar energy, Ag@Fe 3 O 4 core-shell nanoparticles (NPs) were prepared in this paper. The influences of different preparation conditions on the particle structure and photo-thermal properties were investigated, and the growth and spectral absorption properties of Ag@Fe 3 O 4 NPs were analyzed. At the same time, nanoparticles-modified carbon membranes (NPCMs) were prepared by electrostatic adsorption method. The influences of radiation intensity and preparation concentration on photo-thermal properties were investigated, and the local evaporation mechanism of NPCMs was deeply explored. Experiments showed that changing the molar ratio of the precursor can effectively regulate the structure and optical properties of the NPs. The increase of the core radius of the NPs will increase the electric field strength ( E ) of the core surface and promote the absorption of light. Optimizing the temperature and heating time of the preparation process is very important for the successful realization of Fe 3 O 4 coated Ag, while deepening the coupling between plasmons on the surface of adjacent NPs. Compared with the intensity of 5 sun, the evaporation efficiency at 2 sun is increased by 13.37%. The local evaporation effect caused by NPCMs makes the system still have good evaporation efficiency at low radiation intensity.
研究领域:
材料科学
·
纳米技术
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）