ACS Applied Nano Materials
·
2025
·
IF 5.5
Longxin Wang,Yishan Wang,Dongdong Liu,Yao Wang,Xuji Zhang,Guangwu Wen,Xueqian Zhang,Xiaoxiao Huang
The application of heterostructures and complex morphology has been favored by researchers of electromagnetic wave-absorbing materials. Herein, Fe3O4/Fe2O3/C composites with carbon-coated octahedral structures were prepared and obtained using a polymer self-assembly-guided nonhomogeneous structure engineering strategy to form hierarchical polyhedral structures (200–400 nm in size). The electrostatic attraction of anionic polyacrylamide (APAM) is used to chelate Fe3+. Due to the synergistic effect of intermolecular forces, APAM can be used as a “bridge” to connect multiple micellar particles, and this bridging and entanglement effect facilitates the formation of octahedral Fe3O4/Fe2O3. Compared with nanoparticles, the octahedral structure easily forms a conductive network, and the presence of sharp corners can effectively promote the concentration of charge, promote polarization loss, and extend the reflection and scattering path. Through the high-temperature reduction of APAM, the conversion of part of Fe2O3 to Fe3O4 is realized, which effectively improves the electromagnetic parameters and thus optimizes the impedance matching. Meanwhile, the synergistic effect between the magnetic loss (ferromagnetic resonance) of Fe3O4 and the dielectric loss (interfacial polarization, dipole polarization, and conduction loss) of Fe3O4/Fe2O3/C enhances the absorption of electromagnetic waves. Unsurprisingly, the synthesized Fe3O4/Fe2O3/C composites exhibit excellent EMW absorption performance, with a reflection loss of up to −34.7 dB at 30% paraffin filler ratio and an effective absorption bandwidth (EAB) of 8.64 GHz at 1–3 mm.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
OPTICAL MATERIALS
·
2024
·
IF 3.8
Jianhong Han,Xinyuan Teng,Wenhui Jia,Pai Liu,Yumei Li,Weida Wang
Benzotriazole (BTA) is a kind of nitrogen-containing organic matter with great impact on the environment and biology. In order to further improve the degradation effect of BTA, SnO 2 /Fe 2 O 3 /Cu 2 O (SFC) photocatalytic materials have been successfully prepared by one-pot hydrothermal method . According to the material characterization and experimental results, SFC has a uniform distribution of active sites, which is conducive to the efficient degradation of BTA in water. When the pH is 6.68, the dosage is 0.09 g/L, and the time is 40 min, the degradation effect is the best. The removal rate of BTA by SFC reached 99.89 %. The repeatability test showed that the removal rate of SFC can reach more than 99.27 % after five cycles of experiments.Through PL , UV–Vis and i-t curve analysis, it proved the main mechanism of degradation of BTA by PEC enhanced by SFC. Finally, the possible degradation pathways of BTA were speculated, which provided a new technical support and theoretical basis for the effective treatment of wastewater containing BTA.
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
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
·
2018
·
IF 2.207
Hui Liu,Zhi-Guang Zhang,Xiao-Xiong Wang,Guang-Di Nie,Jun Zhang,Shan-Xiang Zhang,Ning Cao,Shi-Ying Yan,Yun-Ze Long
Highly flexible Fe 2 O 3 /TiO 2 composite nanofibers were successfully synthesized via electrospinning followed by high-temperature calcination . The morphologies and structures of Fe 2 O 3 /TiO 2 nanofibers were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), and ultraviolet-visible (UV-Vis) spectroscopy, and their optical properties , photocatalysis and photodetection properties were also measured. The flexible nanofibers possess large specific surface area, and can be recycled by a magnet. Moreover, the absorption region has been extended from the UV region to the visible region, improving the performance of photocatalyst under visible light radiation . In addition, the formation of Fe 2 O 3 /TiO 2 heterostructures suppresses the recombination of photogenerated electron-hole pairs, which also improves the photocatalyst behavior. Particularly, these nanofibers can also work as a sensitive UV detector, which offers in situ monitor method of such photocatalysis materials.
研究领域:
材料科学
·
环境科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2016
·Vol. 18
·期 13
·9176-9185
·
IF 4.449
Xin Li,Huiming Lin,Xiang Chen,Hao Niu,Jiuyu Liu,Ting Zhang,Fengyu Qu
The design and synthesis of unique novel heterostructures for high-performance photocatalytic activity has exerted a tremendous fascination and has recently attracted intensive attention. In this work, a branch-like α-Fe2O3/TiO2 heterostructure has been synthesized controllably through an electrospinning method combined with a hydrothermal approach. The backbone of the heterostructure is composed of a 3D porous TiO2 nanofiber (∼70 nm in diameter) network with plenty of α-Fe2O3 nanorods (100–200 nm in length) deposited on them. The novel branch-like nanocomposites have an abundantly porous structure as well as large surface areas (up to 42.8 m2 g−1). In addition, their visible light photodegradation behaviour towards organic dyes, including Congo red (CR), methylene blue (MB), eosin red (ER) and methyl orange (MO), was investigated. Their excellent photocatalytic performances are attributed to their large surfaces, improved visible light absorption and high separation efficiency of the photogenerated electrons/holes. Furthermore, the degradation process was further studied by varying the amount of α-Fe2O3 deposited. The sample α-Fe2O3/TiO2-3 possessed the best performance to efficiently decolor CR solution even at a high concentration of 50 mg L−1 (160 min, 94 mg g−1), ascribed to the high adsorption capacity derived from the large surface, strong electrostatic interaction and structural match between α-Fe2O3/TiO2-3 and CR. These α-Fe2O3/TiO2 heterostructures exhibit great potential for decontamination of organic pollutants in waste water under visible light.
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
Water Science and Engineering
·
2022
·
IF 0
Jian-hong Han,Wen-hui Jia,Yi Liu,Wei-da Wang,Lian-ke Zhang,Yu-mei Li,Peng Sun,Jian Fan,Shu-ting Hu
Given the difficulties of degrading benzotriazole (BTA), this study used a one-pot hydrothermal method to prepare α-Fe 2 O 3 /Cu 2 O (FC) composites for photoelectrocatalytic (PEC) degradation of BTA. The characterization of FC structure showed that Cu 2 O in cubic crystals was loaded with circular sheets of Fe 2 O 3 . Owing to this structure, FC showed efficient PEC degradation of BTA when exposed to ultraviolet light. The experimental results demonstrated that FC efficiently degraded BTA. When the PEC degradation continued for 60 min, 100% degradation of BTA was achieved because FC enhanced the photoelectron-hole separation and the separation and transfer of articulated carriers. High performance liquid chromatography–mass spectrometry showed that intermediates formed during the PEC degradation of BTA. Finally, various pathways for degradation of BTA were postulated. This FC-based PEC system provides a harmless and effective method for degradation of BTA.
研究领域:
环境科学
·
催化材料
·
化学工程
✓ 已验证
产品关联
DOI
SEMICONDUCTOR SCIENCE AND TECHNOLOGY
·
2021
·Vol. 36
·期 7
·075004
·
IF 2.352
Yefeng Chen,Dan Tang,Zhuhan Wang,Wen Li,Mengyun Yin,Qin Yang,Yafen Zhou,Kaiming Zhang,Taotao Kan,Limei Zhou
As an important intermediate, imine is widely used in industrial chemistry. The photocatalytic oxidation of amines to form imines is a green and economical method. But it remains a challenge for the efficient transformation under mild conditions. Herein, a Z-scheme carbon nitride (CM)-Fe2O3 heterojunction photocatalyst was synthesized by in-situ preparation of Fe2O3 nanoparticles on two-dimensional CM nanosheets. The as-prepared catalyst exhibited efficient photocatalysis activity in selective oxidation of benzylamine to N-benzylidene benzylamine. Under ambient air and room temperature, the selectivity and conversion rate both can reach 99.9%, and the corresponding turnover frequency value reaches up to 9.99 mmol g−1 h−1, superior to the most of heterogeneous photocatalysts reported in previous literatures. The excellent catalytic activity of the modified CM material may be due to the enhanced absorption of visible light and the improved photogenerated carrier separation and migration rate, and the Z-scheme mechanism also retains the strong oxidation and reduction ability of the composite material. This work will provide a promising and practical method to promote the photocatalytic conversion of solar-driven organics.
研究领域:
材料科学
·
环境化学
·
光催化技术
✓ 已验证
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2016
·
IF 5.267
Fan Wang,Zehui Zhang
Catalytic transfer hydrogenation of the C═O bond has been considered to be one of the most important processes for the synthesis of fuels and chemicals. In this study, we have developed a metal-free transfer hydrogenation of furfural into furfuryl alcohol and some other valuable carbonyl compounds into alcohols as the hydrogen donors. Hydroxyapatite-encapsulated magnetic γ-Fe2O3 (γ-Fe2O3@HAP) acted as a magnetic base to promote this transfer hydrogenation with iso-propanol as the hydrogen donor. The catalytic performance of the γ-Fe2O3@HAP catalyst was greatly affected by the structure of alcohol. iso-Propanol was the best hydrogen donor for the transfer hydrogenation. In addition, the reaction temperature and the catalyst loading also affected this reaction. The highest yield of furfuryl alcohol reached 91.7% at a furfural conversion of 96.2%. Furthermore, this method was also useful for the transfer hydrogenation of other important carbonyl compounds into value-added chemicals and fuels. After the reaction, the γ-Fe2O3@HAP catalyst could be easily collected with the assistant of a magnet, and reused for six runs without the loss of its catalytic activity.
研究领域:
化学工程
·
催化科学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2015
·Vol. 5
·期 75
·61239-61248
·
IF 3.84
Jun Liu,Wei Wu,Qingyong Tian,Shuanglei Yang,Lingling Sun,Xiangheng Xiao,Feng Ren,Changzhong Jiang,Vellaisamy A. L. Roy
Plasmonic photocatalysts coupled with semiconductors are one of the most popular combinations in environmental remediation applications. In this regard, a novel tube-like α-Fe2O3@Ag/AgCl hybrid structure is fabricated by anchoring Ag/AgCl hybrid nanoparticles on the surface of α-Fe2O3 short nanotubes (SNTs) by a step-by-step strategy. Firstly, the monodispersed α-Fe2O3 SNTs have been synthesized via an anion-assisted hydrothermal process followed by the loading of Ag nanoparticles on the surface of α-Fe2O3 SNTs through the classic silver mirror reaction mechanism. From in situ oxidation of Ag nanoparticles, the final product α-Fe2O3@Ag/AgCl heterostructures has been obtained. We study the morphology, composition, and photocatalytic properties of the as obtained tube-like α-Fe2O3@Ag/AgCl nano-heterostructures. The photocatalytic activities of as obtained photocatalysts have been tested by the degradation of organic dye Rhodamine B (RhB) under simulated sunlight (UV + visible light), visible light and UV light irradiation. The main reason for the enhanced photocatalytic performance is attributed to the broad spectral response from the combination of narrow/wide bandgap semiconductors with metallic Ag nanoparticles and efficient charge transfer from plasmon-excited Ag nanoparticles to α-Fe2O3 and AgCl. Finally, this hybrid structure provides a roadmap for the controlled synthesis of plasmonic photocatalysts with excellent properties, and can be used for practical application in environmental issues.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Yingni Yu,Jing Liu,Yingju Yang,Junyan Ding,Aijia Zhang
Iron oxide (Fe 2 O 3 ) has been used as an effective sorbent to remove various heavy metals due to its large adsorption capacity and low cost. The cadmium capture capability of Fe 2 O 3 sorbent was investigated in the simulated flue gas at the temperatures of 700–1100 °C. Fe 2 O 3 sorbent exhibited much better Cd adsorption capability than SiO 2 and Al 2 O 3 sorbents. The largest Cd adsorption capacity of Fe 2 O 3 sorbent was 86.7 mg/g at 700 °C. The XPS analysis demonstrated that Fe 3+ might partially participate in the cadmium adsorption process. A large quantity of CdO was generated and adsorbed on the Fe 2 O 3 surface. The density functional theory (DFT) calculations were used to determine the active sites and the involved mechanism of different cadmium species adsorption over Fe 2 O 3 sorbent. Cd, CdCl 2 , and CdO can be stably adsorbed on the Fe 2 O 3 surface with the adsorption energies of −40.64 kJ/mol, −237.42 kJ/mol, and −375.03 kJ/mol, respectively. The results illustrate that the Fe atoms are the essential active sites for cadmium species adsorption on Fe 2 O 3 surface. The orbital hybridization between cadmium atom and Fe site suggests that the strong interaction occurs during Cd adsorption process. Both physisorption and chemisorption mechanisms were responsible for the cadmium capture by Fe 2 O 3 sorbent.
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
WATER RESEARCH
·
2017
·
IF 6.942
Xing Ding,Shengyao Wang,Wanqiu Shen,Yi Mu,Li Wang,Hao Chen,Lizhi Zhang
In this study, an electrochemical/electro-Fenton oxidation (EC/EF) system was designed to degrade atrazine, by utilizing boron-doped diamond (BDD) and Fe@Fe 2 O 3 core-shell nanowires loaded active carbon fiber (Fe@Fe 2 O 3 /ACF) as the anode and the cathode, respectively. This EC/EF system exhibited much higher degradation rate, decholorination and mineralization efficiency of atrazine than the electrochemical (EC) and electrochemical/traditional electro-Fenton (EC/TEF) oxidation counterpart systems without Fe@Fe 2 O 3 core-shell nanowires. Active species trapping experiment revealed that Fe@Fe 2 O 3 could activate molecular oxygen to produce more OH through Fenton reaction, which favored the atrazine degradation. High performance liquid chromatography , high performance liquid chromatography-mass spectrometry and gas chromatography-mass spectrometry were applied to probe the decomposition and mineralization of atrazine during this novel EC/EF process, which revealed that two intermediates of triazinons (the isomerization of hydroxylated atrazine) were generated during the electrochemical/electro-Fenton oxidation of atrazine in the presence of Fe@Fe 2 O 3 core-shell nanowires. The experimental and theoretical calculation results suggested that atrazine might be degraded via a triazinon ring opening mechanism, while the presence of Fe@Fe 2 O 3 notably accelerated the decholorination process, and produced more hydroxylated products to promote the generation of trazinons and the subsequent ring cleavage as well as the final complete mineralization. This work provides a deep insight into the triazine ring opening mechanism and the design of efficient electrochemical advanced oxidation technologies (EAOTs) for persistent organic pollutant removal .
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL PHYSICS LETTERS
·
2025
·
IF 3.1
Ziqi Zhong,Borui Du,Guowu Zhan,Jingran Xiao
Herein, the 3D printing technology is harnessed as a new and flexible strategy to fabricate a structural-parameter adjustable 3D-structured Ti-Fe 2 O 3 photoanode. The Ti alloy was discovered to be practicable during the synthesis of Ti-Fe 2 O 3 and enlisted as a substrate material for crafting a conical-array patterned Ti-Fe 2 O 3 photoanode. The conical array fashions an angle between the incident light (longitudinal side) and the photogenerated charge transport (transverse side), along with a considerably augmented light-receiving area. Significantly, the charge separation efficiency progressively escalates as the cone height augments. This undertaking accentuates the importance of modulating the parameter of a 3D-structured Fe 2 O 3 photoanode.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Qianqian Guo,Bin Zhang,Zhengfang Yang,Qisheng Wang,Qing Wang,Guanbin Wen
This study employed rare earth element, Ce, and elemental Fe to prepare antimicrobial nanocomposites with enzyme-like activity. The materials were characterized by SEM, EDS, and XRD, as well as antimicrobial and drug resistance properties were tested. XPS analysis revealed a change in the valence state of Ce 3d in CeO 2 /Fe 2 O 3 on addition of Fe. Furthermore, UV–vis spectral results showed that the band gap of the composite material decreased after composite formation. The creation of a heterogeneous structure was a significant factor responsible for enhancing the antimicrobial performance. The study analyzed the peroxidase (POD) activity of the materials using UV–vis spectroscopy. Results showed that the enzyme activity of the composites was significantly enhanced, compared to the individual materials. This enhancement combined with H 2 O 2 to induce the production of ROS, resulted in a significant increase in the antimicrobial effect. The antimicrobial rate of the composite material exceeded 90 % at 250 µg/mL concentration. The antibacterial mechanism revealed that it primarily operated through synergistic effects of ROS, ionic dissolution, and damage by adsorption. It also had an apparent inhibitory effect on bacterial micro-organisms in water, which has wider application prospects.
研究领域:
材料科学
·
微生物学
·
生物医学工程
✓ 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）