Materials Research Express
·
2016
·Vol. 3
·期 7
·075024
·
IF 0.968
Shiben Liu,Yingjie Chen,Lifeng Dong
Hybrid nanostructures can be multifunctional and even possess enhanced properties. Ag–Fe2O3 nanocomposites and Ag nanoparticles (NPs) were fabricated and applied to catalyze the reduction of 4-nitrophenol. Compared with Ag NPs, Ag–Fe2O3 nanocomposites demonstrated enhanced catalytic activities. Furthermore, due to their magnetic properties, Ag–Fe2O3 nanocomposites could be easily separated from the reaction mixture and recycled through an external magnetic field. These findings will help us design hybrid nanostructures with catalytic activity and explore other potential applications of magnetic nanocomposites.
研究领域:
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Qiong Sun,Bing Han,Kaijing Li,Liyan Yu,Lifeng Dong
Photocatalytic fuel cell (PFC) is a novel energy conversion device that can effectively convert light into chemical energy and then electrical energy, accompanied with the pollutant purification treatment by photocatalytic technology. In this study, the synergetic photocatalytic degradation of organic dye in anode and the reduction of heavy metal Cr(VI) in cathode are carried out in an improved dual-chamber PFC device with TiO 2 and core–shell structured Ag@Fe 2 O 3 nanoparticles as photoanode and cathode materials , respectively. Among different materials, Ag@Fe 2 O 3 shows the highest catalytic activity to the reduction of Cr(VI) with an apparent kinetic constant of 0.058 min −1 , even much better than commercial Pt foil (0.027 min −1 ). From morphology and electrical characterizations, the excellent electrical conductivity of noble metal Ag and suitable conduction band positions between TiO 2 and Fe 2 O 3 lead to a rapid and directional transfer of photoinduced electrons, and the variable valence of Fe(II)/(III) in iron oxide facilitates continuous catalytic reduction of Cr(VI) to Cr(III). Moreover, the addition of H 2 O 2 into anode chamber can significantly accelerate the reactions and electricity output. The radical quenching tests prove that the existence of H 2 O 2 can efficiently increase the production of photoinduced carriers, and more oxidizing species (such as O 2 − and OH) can be produced from the reactions between H 2 O 2 and photoinduced holes or electrons.
研究领域:
环境科学
·
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
Frontiers of Chemical Science and Engineering
·
2023
·Vol. 18
·期 1
·1-9
·
IF 4.5
Sun Likun,Xiong Kesi,Zhang Baoning,Fang Jinghong,He Yingchao,Wang Min,Gan Zhixing,Du Fanglin,Sun Qiong,Yu Liyan,Dong Lifeng
In a dual-chamber photocatalytic fuel cell device, polyvinyl alcohol degradation and H 2 evolution were concurrently achieved. The setup involved commercial P25 as the photoanode and Ag@Fe 2 O 3 nanoparticles as the cathode. Additionally, the feasibility of a Fenton-like reaction in the cathode, utilizing Fe 2+ ions and pumped O 2 , was demonstrated. Different cathode materials, polyvinyl alcohol types, and pH values’ effects were assessed on device performance. Quenching tests highlighted photoinduced holes (h + ) and OH· radicals as pivotal contributions to polyvinyl alcohol degradation. Long-term stability of the device was established through cycling experiments.
研究领域:
环境科学
·
材料科学
·
能源科学
✓ 已验证
DOI
高影响因子
CATALYSIS TODAY
·
2022
·
IF 6.562
Xiaotong Li,Xufei Shao,Zhisheng Wang,Jinzhu Ma,Hong He
Catalytic decomposition is a promising method of ozone (O 3 ) removal, and Ag-based catalysts have shown excellent O 3 decomposition performance. In this study, the chemical states of Ag species were successfully regulated by varying the loading of Ag and the particle size of α-Fe 2 O 3 supports, and the O 3 decomposition performance of different Ag species (monatomic Ag, Ag clusters (1–2 nm), small Ag nanoparticles (3–5 nm), large Ag nanoparticles (7–12 nm)) was determined. The changes undergone by Ag species after exposure to ozone were characterized in detail, and the ozone decomposition performance of the corresponding Ag species was determined. The terminal and doubly bridging hydroxyl groups on the Fe 2 O 3 support were determined to be the anchoring sites for Ag species. The Ag species and Fe 2 O 3 support are connected through oxygen bridges, forming Ag-O-Fe linkages. This study provides guidance for understanding the mechanism of the interaction between metals and supports and follow-up development of high-efficiency Ag-based catalysts.
研究领域:
催化化学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2021
·
IF 4.539
Qiong Sun,Peng Hou,Songhao Wu,Liyan Yu,Lifeng Dong
A Z-scheme mechanism associated with localized surface plasmon resonance (LSPR) effect is proposed and proved in a ternary Ag-Fe 2 O 3 -TiO 2 composite for photocatalytic reactions. The Ag, Fe 2 O 3 and TiO 2 nanoparticles are prepared to exist in a closely connected Ag-Fe 2 O 3 -TiO 2 heterostructure . Compared to TiO 2 , the addition of Ag-Fe 2 O 3 causes a broad absorption in visible region by LSPR effect of Ag to facilitate electron transfer from TiO 2 to Ag. In addition, electron migration from TiO 2 to Fe 2 O 3 can also be detected, indicating the interface between TiO 2 and Fe 2 O 3 can offer a route with low resistance for charge separation and directional transfer. As a result, photocatalytic activities are greatly improved in Ag-Fe 2 O 3 -TiO 2 , with the highest calculated apparent kinetic constant located at 0.027 min −1 , which is 7.3, 1.9, 1.7 and 1.5 times of Ag-Fe 2 O 3 , TiO 2 , Ag-TiO 2 and Fe 2 O 3 -TiO 2 , respectively. Free radical quenching experiments show that O 2 -∙ and positively charged holes are main oxidative species responsible for the degradation of dyes. Specifically, OH∙ radicals can be hardly found in pure TiO 2 under irradiation but can be extensively produced and participate in the degradation after the addition of Ag-Fe 2 O 3 , which further proves that a Z-scheme route dominates the electron transfer between TiO 2 and Fe 2 O 3 .
研究领域:
材料科学
·
环境科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2020
·
IF 3.594
Di Xu,Lingfeng Duan,Wenlin Jia,Guohai Yang,Yingqiu Gu
Noble metal nanoparticle aggregates are attracting increasing interest as SERS active substrates for the ultrasensitive detection of environmental and biological samples. Deposition of noble metal nanoparticles on magnetic metal oxide is an effective way to not only realize the assembly of noble metal particles, but also enrich analytes in highly diluted solution. Herein, Ag@Fe 2 O 3 hybrid was prepared by a simple method and applied for sensitive and recyclable SERS detection. The low detection limit of R6G (LOD = 9.3 × 10 −10 M) and CV (LOD = 1.7 × 10 −9 M) demonstrated the excellent sensitivity for SERS application. The high stability during long-term detection illustrated the super detection capability of the Ag@Fe 2 O 3 hybrid substrate. The synergistic effect of the electromagnetic enhancement originated from nanogaps between densely and closely distributed Ag nanoparticles, the chemical enhancement from semiconductor material of Fe 2 O 3 and the magnetic enrichment of the analyte molecules was account for the excellent SERS performance of the Ag@Fe 2 O 3 substrate. As a result, the Ag@Fe 2 O 3 hybrid substrate was successfully applied to detect bilirubin in human blood and showed excellent detection ability (LOD = 2.3 × 10 −8 M).
研究领域:
材料科学
·
分析化学
·
纳米技术
·
生物医学传感
·
环境监测
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）