JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2024
·Vol. 35
·期 8
·1-16
·
IF 2.8
Liu Hui,Dai Jianfeng,Huang Danqiang,Yu Rui
The mitigation of electromagnetic wave pollution is a pressing concern that can be addressed by the effective utilization of microwave-absorbing materials characterized by low density, thin thickness, wide absorption bandwidth, and robust absorption strength. This work used a two-step solvent-thermal and hydrothermal approach to create nitrogen-doped reduced graphene oxide (NRGO)/ZnFe 2 O 4 hollow-structured composite microwave absorbent materials. The study of its microstructure reveals that the flaky NRGO is well adhered to the hollow ZnFe 2 O 4 with a rough surface. The findings indicate that the electromagnetic wave absorption characteristics of NRGO/ZnFe 2 O 4 are influenced by the variable contents of NRGO. At the NRGO doping level of 15%, the NRGO/ZnFe 2 O 4 composites exhibit the best electromagnetic wave absorption capabilities. With the matching thickness of 4.91 mm, the minimum reflection loss ( RL min ) can approach − 59.95 dB. This study serves as a significant point of reference for the development of highly effective electromagnetic wave absorption materials using graphene.
研究领域:
材料科学
·
电子工程
✓ 已验证
DOI
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2021
·
IF 4.094
Jianfeng Dai,Xinchao Wen,Wei Feng,Chen Cheng,Danqiang Huang
Nanocomposite SrFe 12 O 19 @ZnFe 2 O 4 with core-shell structure has been synthesized in one step via coaxial electrospinning followed by heat treatment in air. The samples comprise two phases, the structure change from fiber coated particles to core-shell fibers, and finally form a scattered sheet structure. The inner diameter of the nanofiber with core-shell structure is 100 nm and the outer diameter is 170 nm, two-phase coupling interface is obvious, and the length of the nanofiber can reach 1.8 μm. The magnetic properties of the composites show a decreasing trend after upward, reaching the highest Ms (43 emu/g) and Hc(4524 Oe) at 900 °C, which is better than for other materials with various morphologies such as sheet and particle. The hysteresis loop at 900 °C shows a single-phase-like magnetic characteristic, indicating the existence of effective exchange coupling. This study provides a basis for the preparation of hard-soft nanocomposite ferrite fibers with controlled core-shell structure, excellent exchange coupling and outstanding magnetic properties .
研究领域:
材料科学
·
磁性材料
✓ 已验证
DOI
高影响因子
Catalysis Science & Technology
·
2017
·Vol. 7
·期 11
·2236-2244
·
IF 5.773
Huabin Chen,Wenxia Liu,Zhuozhuo Qin
The majority of current photocatalysts are generally excited under ultraviolet (UV) and visible light, while near-infrared (NIR) light accounting for nearly half of solar light has not been fully used. Herein, a ZnO/ZnFe2O4 nanocomposite with the ability to degrade an organic dye in the presence of H2O2 under NIR irradiation was prepared by a co-precipitation method followed by calcination at 800 °C. As revealed by optical absorption analysis, the ZnO/ZnFe2O4 nanocomposite exhibits significant optical absorption in the UV, visible and NIR light regions. Benefitting from this unique photo-absorption property and the generation of reactive ˙OH mainly by the reaction of photogenerated electrons with H2O2, the ZnO/ZnFe2O4 nanocomposite performs well in photodegrading methyl orange under either UV, visible or NIR irradiation. Moreover, the UV, visible and NIR photocatalytic activities of the ZnO/ZnFe2O4 nanocomposite did not change significantly after three runs of recycling. This finding opens a new approach for fully utilizing solar light energy, especially the energy of NIR light.
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
CHEMOSPHERE
·
2022
·
IF 8.943
Jinhua Luo,Yaohui Wu,Mengzhu Jiang,Aihua Zhang,Xiaoyong Chen,Yelin Zeng,Yonghong Wang,Yunlin Zhao,Guangjun Wang
Developing broad-spectrum light reactions, effective charge separation, and easily recoverable photocatalysts were considered cost-effective pollution remediation methods. The ZnFe 2 O 4 /BC/ZnO composite was prepared to achieve these objectives, where biochar (BC) was used as a conductive channel and ZnFe 2 O 4 as a magnetic substance. Among them, the 0.6-ZBO composite performed the best, with photocatalytic removal of tetracycline (TC) reaching 85.6%. The photocatalytic degradation rated constant of 0.6-ZBO composite was 23.36 × 10 −3 min −1 , which was 7.6, 4.1, and 2.5 times higher than that of ZnFe 2 O 4 /BC, ZnO, and ZnFe 2 O 4 /ZnO samples, respectively. According to several characterization data, it was demonstrated that successful Z-scheme heterojunctions were constructed between ZnFe 2 O 4 and ZnO. The 0.6-ZBO complex increased the range of light absorption and strengthened the separation of electron-hole pairs, thus improving the redox ability of the complex. In the different water matrices, the stability of 0.6-ZBO was excellent and its ability to remove TC decreased slightly to about 11% after 5 cycles. This work provided a valuable approach to design a novel and efficient system for degrading organic pollutants in wastewater using magnetic biochar.
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
ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Chun Zhang,Yinan Gu,Guixiang Teng,Liping Wang,Xiaodong Jin,Zengwei Qiang,Weigang Ma
Development of highly efficient photocatalysts is a primary goal in the photocatalysis domain among which reusable composites with a synergistic photocatalytic effect have attracted extensive interest. The ability of catalysts to capture light determines their photocatalytic effect, and porous or hollow photocatalysts are more conducive to the entry and reflection of light. The goal of this research is to develop a type of visible-light-driven, double-shell photocatalyst with high antibacterial activity and excellent cycling stability. Photocatalysts were fabricated using hollow graphitized ZnFe2O4 nanospheres (G-ZnFe2O4) as the carrier. After G-ZnFe2O4 was functionalized with a polydopamine (PDA) template layer, Ag nanoparticles (NPs) and cubic AgCl NPs were in situ generated on the surface of the PDA/G-ZnFe2O4 nanospheres successively. Then, the PDA template was removed using KOH solution, and double-shell Ag/AgCl/G-ZnFe2O4 nanocubes (referred to as DAGZNs) with excellent photocatalytic antibacterial activity were constructed. The DAGZNs showed excellent antibacterial properties against Staphylococcus aureus and Escherichia coli. The efficient synergistic photocatalytic antibacterial activity coupled with magnetic separability and recyclability of DAGZNs make them potential for practical application in water purification and environmental protection. The method of designing and synthesizing double-shell structures to enhance photocatalysis may also be extended to synthesis of other photocatalytic and optical materials.
研究领域:
材料科学
·
环境科学
·
生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF POROUS MATERIALS
·
2022
·Vol. 29
·期 5
·1431-1440
·
IF 2.523
Zhang Shixian,Rong Xinshan,Sun Ting,Gao Ping,Liu Jun,Qiu Xuchun,Zhou Xiangtong,Wu Zhiren
An energy-efficient and environmentally friendly nitrogen fixation process is urgently needed to solve problems of high energy consumption and high emissions in the traditional ammonia industry. In this work, a Z-scheme porous g-C 3 N 4 /ZnFe 2 O 4 photocatalyst was synthesized, characterized and employed for N 2 photofixation. Temperature programmed desorption characterization confirmed that the adsorption capacity of nitrogen was improved for the porous structure. From N 2 photofixation evaluation experiments, the highest ammonia production efficiency can reach 147.33 μmol/L within 120 min. Photocatalytic performance is greatly improved because of the increasing of specific surface areas, enhancement of N 2 adsorption ability and synergistic effect of Z-scheme photocatalytic system. In the ammonia production process of the research, visible light is used as energy; N 2 and H 2 O are used as raw materials, which possesses a good application potential due to the advantages of being energy-efficient, environmentally friendly and pollution-free.
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
CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
Fei Li,Li Zhuang,Wenwei Zhan,Manxi Zhou,Gang Sui,Aosong Zhou,Gang Bai,Wei Xiao,Xiaoping Yang
ZnO decorated ZnFe 2 O 4 nanoparticles were synthesized and combined with reduced graphene oxide (rGO) to form ZnFe 2 O 4 @ZnO@rGO ternary hierarchical nanocomposites by a controllable method. The microstructure, morphology, and microwave absorption performance of the ZnFe 2 O 4 @ZnO@rGO nanocomposites were investigated in detail. The permittivity and permeability of the composites can be effectively regulated by controlling the content of ZnO and rGO to achieve a good impedance matching. Due to the synergistic effect of dielectric loss and magnetic loss, the ZnFe 2 O 4 @ZnO@rGO nanocomposites exhibited strong wave absorption and wide absorption bandwidth. The optimal reflection loss (RL) of the ZnFe 2 O 4 @ZnO@rGO nanocomposites reached −35.2 dB at 12.0 GHz with a thickness of 2.0 mm and the effective absorption bandwidth was 3.7 dB. The ZnFe 2 O 4 @ZnO@rGO hierarchical architecture produced lots of heterogeneous interfaces which made a significant contribution to the wave absorption performance. The combination of interfacial polarization, dipole polarization, and eddy current loss enhanced the microwave absorption capacity of the ZnFe 2 O 4 @ZnO@rGO system. This work provides a feasible approach for the design and preparation of wave absorption materials with tunable permittivity and permeability.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
INORGANIC CHEMISTRY
·
2018
·
IF 4.7
Huiting Bi,Fei He,Yunlu Dai,Jiating Xu,Yushan Dong,Dan Yang,Shili Gai,Li Li,Chunxia Li,Piaoping Yang
The strategy of diagnosis-to-therapy to realize the integration of imaging and high antitumor efficiency has become the most promising method. Light-induced therapeutic technologies have drawn considerable interest. However, the limited penetration depth of UV/vis excitation and relatively low efficiency are the main obstacles for its further clinic application. For this concern, we presented a facile method to anchor ultrasmall ZnFe2O4 nanoparticles and upconversion luminescence nanoparticles (UCNPs) on graphene oxide (GO) nanosheets (GO/ZnFe2O4/UCNPs, abbreviated as GZUC). To solve the penetration question, here we introduced Tm3+-doped UCNPs to convert the high-penetrated near-infrared (NIR) light into UV/vis photons to activate the photodynamic process. In this system, the dual phototherapy from GO and ZnFe2O4 has been realized upon NIR laser irradiation. Combined with the photodynamic therapy (PDT) based on Fenton reaction that ZnFe2O4 nanoparticles react with excessive H2O2 in tumor microenvironment to produce toxic hydroxyl radicals (·OH), an excellent anticancer efficiency has been achieved. Furthermore, 4-fold imaging including upconversion luminescence (UCL), computed tomography (CT), magnetic resonance imaging (MRI) and photoacoustic tomography (PAT) has been obtained due to its intrinsic properties, thereby successfully realizing diagnosis-monitored therapy. Our demonstration provided a feasible strategy to solve the main problems in current light-triggered theranostic.
研究领域:
生物医学工程
·
肿瘤学
·
纳米医学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Ping Wei,Shiheng Yin,Tao Zhou,Chao Peng,Xiaolong Xu,Juncai Lu,Minchao Liu,Jianbo Jia,Kun Zhang
The occurrence of pharmaceutical and personal care products (PPCPs) in the ambient environment has raised serious concerns. Herein, a dispersed ZnFe 2 O 4 nanoparticle loaded Ag@Ag 2 CO 3 nanorod hybrid (ZnFe 2 O 4 /Ag@Ag 2 CO 3 ) was facile prepared, and used as a solar light driven photocatalyst for the degradation of tetracycline (TC), a typical PPCPs. The hybrids were characterized by XRD, SEM, EDS, HRTEM, DRS, PL, TRPL, M−H , BET, XPS, ESR and photoelectrochemical testing. The ZnFe 2 O 4 was evenly dispersed on the surface of Ag@Ag 2 CO 3 nanorods of which diameter was about 100 nm. The obtained ZnFe 2 O 4 /Ag@Ag 2 CO 3 composites exhibited high TC degradation efficiency after 150 min Xe light illumination, which was much better than those of pure Ag@Ag 2 CO 3 and ZnFe 2 O 4 . The photodegradation reaction rate constant ( k ) of the optimum ternary photocatalyst (ZnFe 2 O 4 loading 5% wt) increased 4.04 times and 2.48 times than those of pure ZnFe 2 O 4 and Ag 2 CO 3 @Ag, respectively. More importantly, the stability and recovery capacity of the ZnFe 2 O 4 /Ag@Ag 2 CO 3 photocatalyst improved obviously than those of Ag@Ag 2 CO 3 . The reactive oxygen species (ROS) experiment indicated that • OH、h + and • O 2 − involved in the photocatalytic reaction process, and the ROS contributes order was • O 2 − > h + > • OH. The band positions of individual ZnFe 2 O 4 and Ag 2 CO 3 were elucidated via DRUV–Vis spectra and Mott-Schottky plots. Based on the results of ROS experiment and band structure of ZnFe 2 O 4 and Ag 2 CO 3 , it could be inferred that the photocatalytic reaction of ZnFe 2 O 4 /Ag@Ag 2 CO 3 abided by Z-scheme mechanism, that is, Ag acted as the electronic bridge between Ag 2 CO 3 and ZnFe 2 O 4 , and the • OH and • O 2 − were formed on the valence band (VB) of Ag 2 CO 3 and conduction band (CB) of ZnFe 2 O 4 , respectively, and then TC was further oxidized. The sufficient photocatalytic degradation of TC in ambient water revealed that a sunlight-driven ZnFe 2 O 4 /Ag@Ag 2 CO 3 photocatalytic process may be efficiently applied for the remediation of PPCPs contaminated natural waters.
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 COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Zijian Liao,Mingliang Ma,Zhouyu Tong,Yuxin Bi,Kwok L. Chung,Mingtao Qiao,Yong Ma,Aijie Ma,Guanglei Wu,Zongxuan Li,Yu Zhang
In this work, one-dimensional (1D) ZnFe 2 O 4 @carbon@MoS 2 /FeS 2 composites were synthesized by hydrothermal method , magnetic-field-induced distillation-precipitation polymerization and high-temperature carbonization . The structure, morphology, composition , magnetic performance and electromagnetic (EM) wave absorbing properties of the composites were systematically studied. The composites show strong microwave absorption (MA) capacity with a minimum reflection loss (RL min ) value of −52.5 dB at 13.2 GHz, and have an effective absorption frequency range of 10.10–15.08 GHz with a bandwidth of 4.98 GHz when the thickness is 2.23 mm. It is expected that as-synthesized 1D ZnFe 2 O 4 @carbon@MoS 2 /FeS 2 composites can be a promising EM wave absorption material.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
OPTICAL MATERIALS
·
2023
·
IF 3.9
Zhaoxin Huang,Xiaoyuan Qiu,Dandan Chen,Xiaolong Wu,Shasha Zhang,Pengfei Zhu
A novel Ag 2 CO 3 /ZnFe 2 O 4 /bentonite composite photocatalyst with a Z-type heterojunction was prepared using a solvothermal-in situ precipitation method. Under optimal conditions, with a mass ratio of ZnFe 2 O 4 to bentonite at 1:1.5 and a mass ratio of Ag 2 CO 3 to ZnFe 2 O 4 /bentonite at 1:3, the removal rate of norfloxacin (NOR) solution at 30 mg/L by Ag 2 CO 3 /ZnFe 2 O 4 /bentonite under visible light irradiation was found to be as high as 94.40% At the same time, the photocatalyst has good universality and reuse stability. The experimental results of photocatalyst characterization and mechanism exploration demonstrate that the photocatalytic activity of Ag 2 CO 3 /ZnFe 2 O 4 /bentonite is significantly enhanced, which can be attributed to the effective separation of electron-hole pairs, improvement in visible light absorption capacity, and enhancement of adsorption properties. The radical capture experiments revealed that h + played a pivotal role in the photocatalytic degradation of NOR by Ag 2 CO 3 /ZnFe 2 O 4 /bentonite, while ·O 2 − and ·OH acted as secondary factors. Ultimately, a Z-type heterojunction electron transfer mechanism was proposed. This study proposes the Ag 2 CO 3 /ZnFe 2 O 4 /bentonite photocatalysts with excellent stability for the treatment of NOR.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Zhao Lu,Yan Wang,Xiaochuang Di,Runrun Cheng,Longqi Yang,Peihu Gao
In order to overcome the problems caused by electromagnetic pollution, the design and development of high-performance microwave absorbers is urgently required. In this work, a hierarchical ZnFe 2 O 4 @MnO 2 @RGO composite was successfully fabricated via a facile and rapid hydrothermal method . Its unique core-shell structure and synergistic effect between multiple components are beneficial for electromagnetic wave absorption. The morphology, elemental composition, microstructure and microwave absorption characteristics were systematically studied. With a filler loading of 20 wt%, the composite presents a minimum reflection loss (R Lmin ) of −46.7 dB and an effective absorption bandwidth (EAB) as wide as 5.2 GHz at a thickness of 2.5 mm. The superior absorption ability profits from a special microstructure, good impedance matching, multiple attenuation features, interfacial polarization, and the synergistic effect of dielectric and magnetic loss. Consequently, this work lays a foundation for the design of high-performance electromagnetic wave absorbers with multicomponent heterogeneous structures.
研究领域:
材料科学
·
电磁学
✓ 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）