ChemistrySelect
·
2024
·Vol. 9
·期 27
·e202303733
·
IF 1.9
Yao Gu,Dongjian Shi,Liang Wang,Mingqing Chen
Graphical A range of Fe 3 O 4 /Ag/BiVO 4 /sepiolite composite materials, featuring varying Fe 3 O 4 concentrations, were synthesized utilizing the co-precipitation method. The inherent magnetic characteristics of Fe 3 O 4 , combined with the resultant Z-type heterojunction structure, confer exceptional photo-catalytic prowess upon the material. This enables swift degradation of rhodamine B, and furthermore, facilitates its retrieval for subsequent reuse. To increase specific surface area and light utilization of photo-catalysts, a series of Fe 3 O 4 /Ag/BiVO 4 /sepiolite composites with different Fe 3 O 4 contents were synthesized via co-precipitation. The structure, composition, and optical properties of these composites were characterized using X-ray diffraction (XRD), nitrogen adsorption and desorption (BET), UV-Vis diffuse reflectance spectroscopy (UV-Vis DRS), and fluorescence spectroscopy (PL). The photo-catalytic activity of the composites was further evaluated using rhodamine B as a model for photo-catalytic degradation. The results revealed that the composites with optimal Fe 3 O 4 loading exhibited the narrowest bandgap width, approximately 2.13 eV, and the highest electron-hole pair separation efficiency. Rhodamine B could be almost completely degraded within a short illumination time in the presence of the Fe 3 O 4 /Ag/BiVO 4 /sepiolite composites. The degradation mechanism of rhodamine B was proposed to involve the improvement of the photo-catalytic activity of the resulting composites by the Fe 3 O 4 and the Z-type heterojunction structure. Additionally, the composites could be recycled and reused multiple times, making them an environmentally friendly and sustainable option.
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
RSC Advances
·
2018
·Vol. 8
·期 71
·40804-40812
·
IF 2.936
Junhui Liu,Long Kong,Xueqiong Huang,Min Liu,Liang Li
In this study, magnetic sulfur-doped Fe3O4 nanoparticles (Fe3O4:S NPs) were applied as adsorbents for the removal of As(V). Fe3O4:S NPs were fabricated by a two-step route, which included low-temperature mixing and high-temperature sintering. The as-prepared Fe3O4:S NPs could effectively remove As(V) under a wide pH range of 2–10 and presented a high As(V) adsorption capacity of 58.38 mg g−1, which was much better than undoped Fe3O4 nanoparticles (20.24 mg g−1). Adsorption experiments exhibited a pseudo-second-order model of adsorption kinetics and a Langmuir isotherm model of adsorption isotherms. Additionally, the coexisting ions such as NO3−, SO42−, and CO32− had no significant effect on As(V) adsorption and the adsorbent worked well in actual smelting wastewater. XPS and FTIR spectra of Fe3O4:S NPs before and after As(V) adsorption showed that Fe–OH groups played a significant role in the adsorption mechanisms. Moreover, the magnetic Fe3O4:S NPs adsorbents after adsorption could be rapidly separated from wastewater with an external magnetic field. Therefore, Fe3O4:S NPs could be an ideal candidate for the removal of As(V) from water.
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
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2023
·Vol. 25
·期 37
·25780-25788
·
IF 3.3
Runna He,Shuangqing Sun,Jianpeng Cui,Mingshuo Chi,Zhikun Wang,Songqing Hu
In recent years, Pickering emulsifiers have been widely used in various production fields due to their excellent structural stability, biocompatibility and environmental friendliness. For some applications, it is required that the emulsifier can quickly respond to environmental stimuli and control the transition between stable and unstable emulsions. In this paper, we report a novel composite Pickering emulsifier with Fe3O4 as the core and magnetic response recognition body, silica as the intermediate protective layer, and chitosan (CS) of different molecular weights to endow solid particles with surface activity and pH-responsive properties. This emulsifier can stabilize the emulsion in the emulsion system with deionized water as the aqueous phase and liquid paraffin as the oil phase and can control the demulsification of the formed emulsion under the dual pH/magnetic stimulation. The experimental results show that Fe3O4@SiO2@CS has good paramagnetism and pH responsiveness. The particle size of the composite emulsifier nanoparticles is between 90 nm and 120 nm, and the best stabilizing effect of the emulsion is achieved when the dosage is 0.5 wt%. In the pH range of 3–11, the emulsifier can rapidly demulsify a stable paraffin oil–water emulsion system under the action of a magnetic field of strength 0.4 T. The pH response of the emulsifier is as follows: when pH ≤ 2, the system can form a stable emulsion, which is composed of fully protonated chitosan as a free chain segment and Fe3O4@SiO2. Emulsion stabilization was achieved with monolithic Fe3O4@SiO2@CS as an emulsifier at pH > 2, and demulsification was achieved at pH ≈ pKb (CS) at 298 K. The research in this paper can provide a feasible idea and synthesis method for the preparation of organic–inorganic composite structure emulsifier.
研究领域:
材料科学
·
化学工程
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2016
·
IF 3.15
Yu Liu,Ruiqi Fu,Yue Sun,Xiaoxin Zhou,Shams Ali Baig,Xinhua Xu
In this study, EDTA-functionalized Fe 3 O 4 (Fe 3 O 4 @SiO 2 -EDTA) was prepared by silanization reaction between N-(trimethoxysilylpropyl) ethylenediamine triacetic acid (EDTA-silane) and hydroxyl groups for Pb(II) and Cu(II) removal from aqueous solutions. Fe 3 O 4 @SiO 2 -EDTA composites were characterized using SEM, TEM, EDX, FTIR, XPS, TGA and saturated magnetization techniques. Maximum Pb(II) adsorption capacity was found to be 114.94 mg g −1 with SiO 2 /EDTA molar ratio of 2.5:1. The adsorption rate was significantly fast and the equilibrium was reached within 10 min. The optimum pH was recorded to be 5.0. The maximum adsorption capacity of the studied heavy metal ions calculated by Langmuir model followed the order: Cu(II) (0.58 mmol g −1 ) > Pb(II) (0.55 mmol g −1 ) ≈ Ni(II) (0.55 mmol g −1 ) > Cd(II) (0.45 mmol g −1 ). Moreover, Pb(II) and Cu(II) adsorption capacities were not significantly affected by co-existing cations and NOM. These results suggested that this adsorbent can be considered as a promising adsorbent to remove Pb(II) and Cu(II) from wastewaters.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2019
·
IF 6.361
Xingliang Chen,Zirui Jia,Ailing Feng,Bingbing Wang,Xiaohua Tong,Chuanhui Zhang,Guanglei Wu
In this work, a novel Fe 3 O 4 @C@MnO 2 hybrid was successfully synthesized via facile method. The morphology, structure, chemical composition , magnetic behavior and EM wave absorbing performance of the hybrid were systematically investigated. Results indicate that the hybrid possesses uniform hierarchical and mesoporous structure. The magnetic saturation(Ms) value of the hybrid is 19.8 emu g −1 , which is beneficial to improve magnetic loss. According to its reflection loss curve, the hybrid performs superior EM wave absorption capacity, with a minimum reflection loss value and effective absorbing bandwidth of −35 dB and 5 GHz when the specimen thickness is 2.7 mm. The excellent performance of this hybrid can mainly be attributed to its ideal matching of magnetic loss and dielectric loss, large specific surface area, mesoporous structure and interfacial polarizations. Such new material has the potential to be a superior electromagnetic wave absorber, or applied as a functional filler to modify resin matrix.
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
CHEMICAL PAPERS
·
2021
·Vol. 75
·期 12
·6399-6406
·
IF 2.097
Yao Lihui,Wang Yajuan,Li Ya,Jiang Zhiqiang,Qiu Dan
A series of Fe 3 O 4 /PLA composites are controllably prepared using consecutive reaction route. The neat PLA and its composites are characterized by FT-IR, WAXRD and XPS for composition analysis. The performances of PLA and Fe 3 O 4 /PLA composites are, respectively, determined by SEM, VSM, CAM, POM, DSC and TG. Fe 3 O 4 particles are a good dispersion in the PLA matrix, and the saturation magnetization values of PLA have increased from 0.33 to 5.06 emu/g. When PLA is transformed into composites, the mean thickness of composites has decreased and water contact angle of composites has increased due to heavy and hydrophobicity Fe 3 O 4 . After addition of Fe 3 O 4 particles, the 50 k, 100 k and 200 k PLA’s crystallization rate is severally increased to 1.84, 1.56 and 1.44 times. It is concluded that the Fe 3 O 4 particles are the efficient crystallization nucleating agent of PLA and faster accelerate the crystallization of low molecular weight PLA in comparison with high molecular weight PLA. The melting points of Fe 3 O 4 /PLA composites slightly have decreased compared with the neat PLA, which is in accord with the melting point of the mixture that is lower than that of the pure substance. By introducing 5 mass% of Fe 3 O 4 particles to PLA, the initial decomposition temperatures reached to higher temperatures as compared to the neat PLA, and the final char yield is about 4.60%. The well dispersion of the particles in the PLA matrix is thought to be an effective barrier to the permeation of heat, which would improve the thermal stability.
研究领域:
材料科学
·
聚合物工程
✓ 已验证
产品关联
DOI
高影响因子
Polymer Crystallization
·
2021
·Vol. 4
·期 4
·e10196
·
IF 0
Fan Liu,Chen Mao,Shou'ang Wu,Bocheng Wang,Chonggang Wu,Tao Hu,Xinghou Gong
Poly (ε-caprolactone) (PCL)/Fe 3 O 4 nanocomposites were prepared via solvent casting method. Microstructure, composition, and crystal structure of the nanocomposite were characterized by transmission electron microscopy, Fourier transform infrared spectroscopy, and X-ray diffraction, respectively. The effects of the content of nano-Fe 3 O 4 on PCL matrix non-isothermal and isothermal crystallization behavior were analyzed by differential scanning calorimeter and polarizing microscopy, respectively, and, the thermal stability of nanocomposites was tested by using thermogravimetric analyzer. The results revealed that Fe 3 O 4 nanoparticles could be dispersed uniformly in PCL matrix. Crystal structure of the polymer matrix was not changed and a handful of nanoparticles has obvious nucleation effect, while excessive particles hindered the crystallization of PCL matrix. However, the thermal decomposition stability of nanocomposites decreased by the addition of Fe 3 O 4 particles.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
JOURNAL OF MEMBRANE SCIENCE
·
2023
·
IF 9.5
Yunxuan Chen,Jun Nan
Membrane fouling has always been a problem hindering the practicability of ultrafiltration . Direct regulation of the structure of the cake layer formed by rapid deposition of flocs as a “secondary barrier” in the in-line coagulation ultrafiltration (C-UF) process has acquired importance as a research topic in comparison to membrane modification and standard coagulation ultrafiltration. In this study, membrane fouling was controlled in the C-UF process via coagulation/nano-scale Fe 3 O 4 load (C/FL-UF) and coagulation/nano-scale Fe 3 O 4 @SiO 2 load (C/FSL-UF). The promotion effects of these two processes (C/FL-UF and C/FSL-UF) on the reduction of membrane fouling and improvement of water quality were systematically studied employing simulated surface water. Floc characteristics, XDLVO theory, and the Hermia model, etc were employed to explain the optimization of cake layer. For coagulation/Fe 3 O 4 load, the floc size was large and loose, whereas, for coagulation/Fe 3 O 4 @SiO 2 load with high recoverability., the floc size was slightly loose. The newly constructed cake layer had improved porosity, structural stability and capacity of water transport. Meanwhile, decrease of unit adhesion free energy and secondary minimum depth along with the substantial increase of energy barrier between the reconstructed cake layers and membranes or colloids explained the mechanism of reduced membrane fouling from the surface energetics. The gradual decrease of water contact angle and the optical images proved that the affinity of the cake layer was significantly reduced. Hermia model further validated the accuracy of this study in controlling membrane fouling by regulating the formation of the cake layer. Finally, the study concluded by analyzing the practicability and efficacy of the procedure to further elucidate the applicability of this research.
研究领域:
环境科学
·
水处理工程
✓ 已验证
产品关联
DOI
高影响因子
TRIBOLOGY INTERNATIONAL
·
2024
·
IF 6.1
Yongfeng Yang,Rui Zhang,Shaowen Dong,Xiaoyang Ma,Jinjin Li
In this study, a stable macroscopic superlubricity state (COF about 0.005) after a short running-in period of 5 s under an ultra-high contact pressure of 1.45 GPa was achieved with the lubrication of polyacrylic acid modified Fe 3 O 4 nanoparticles as additives at the Si 3 N 4 /sapphire interface. The realization of superlubricity can be attributed to the detachment of polyacrylic acid molecules on the modified Fe 3 O 4 nanoparticles surface, which induced the tribochemical reaction between the polyacrylic acid molecules and friction surfaces, generating a tribofilm to prevent the direct contact of the friction pair and provide a low shear strength to reduce friction. The extremely low friction and wear induced by polyacrylic acid modified Fe 3 O 4 nanoparticles may contribute to the development of high-performance lubrication systems.
研究领域:
材料科学
·
摩擦学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Renpeng Yang,Xiaogang Yu,Chengxiong Wei,Chengwei Wu,Wei Zhang
The poor photothermal performance of Fe 3 O 4 magnetic particles under 808 nm near-infrared laser inevitably limits their application in the field of photothermal therapy for tumor. Herein, Fe 3 O 4 clusters with a mean size of 239.1 nm were synthesized by solvothermal method and thermal treatment at 400℃. Compared with the reported Fe 3 O 4 materials, the developed clusters exhibit high extinction coefficient of 7.88 L/(g∙cm) and the highest photothermal conversion efficiency of 51.1 %, for which thermal treatment plays a key role. Due to the introduction of thermal treatment, the increased grain size and decreased grain distance can enhance the Fe 3+ magnetic coupling and thus improve the extinction ability, while the defects caused by high temperature can trigger more electron traps to promote electron non-radiative relaxation and translate into more thermal energy. The measurements of coercivity (10.6 Oe to 67.3 Oe), blocking temperature (382.3 K to over 400 K) and Urbach energy (0.461 eV to 0.692 eV) before and after thermal treatment support this explanation. The in vitro and in vivo photothermal experiments show that the Fe 3 O 4 clusters can kill tumor cells and inhibit tumor growth through the conversion of laser energy into thermal energy.
研究领域:
材料科学
·
医学
·
肿瘤学
✓ 已验证
产品关联
DOI
高影响因子
Particuology
·
2019
·
IF 2.616
Lei Shi,Yurong He,Yanwei Hu,Xinzhi Wang,Baocheng Jiang,Yimin Huang
Size-controlled hollow Fe 3 O 4 nanospheres were synthesized via a one-pot hydrothermal method as a function of reaction time and sodium citrate, polyacrylamide, and urea content. Multiple characterization techniques such as scanning and transmission electron microscopy and Raman spectroscopy were employed to investigate the crystal structure and morphology of the obtained nanospheres. The Fe 3 O 4 nanosphere formation mechanism was elucidated from analyzing the characterization data. High levels of sodium citrate and longer reaction times were observed to increase the diameter of the nanospheres until hollow structures formed. Furthermore, polyacrylamide and urea promoted the formation of hollow structures. The hollow-structured Fe 3 O 4 nanospheres exhibited high magnetization saturation values in the range of 48.8–58.7 emu/g. The facile synthesis method described herein, to generate size-controlled Fe 3 O 4 nanospheres with tailored properties, demonstrates potential across a wide range of fields from drug-delivery and stealth devices, to environmental and energy applications.
研究领域:
材料科学
·
纳米技术
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Physical Chemistry C
·
2015
·
IF 4.772
Tianran Lin,Jing Wang,Liangqia Guo,Fengfu Fu
Molybdenum disulfide (MoS2) has received tremendous attention due to the earth-abundant composition and high catalytic activity. However, the catalytic activity of MoS2 except electro- and photocatalytic has seldom been explored. Herein, Fe3O4@MoS2 core–shell composites were prepared for the first time by in situ growth of MoS2 nanosheets on the surfaces of Fe3O4 nanoparticles under different temperature, and the catalytic performance of the resulting composites was evaluated by using the catalytic reduction of 4-nitrophenol to 4-aminophenol. FE-SEM, TEM, XRD, and XPS analyses verified the core–shell structure with MoS2 nanosheets of defect-rich and oxygen incorporation on the surfaces of Fe3O4 nanoparticles. Fe3O4@MoS2 composites were found to exhibit a high catalytic activity for the reduction of 4-nitrophenol with the highest activity factor k = 3773 min–1 g–1. A plausible catalytic mechanism for the reduction of 4-nitrophenol was also proposed. This study presents an inexpensive, reusable, fast, and highly efficient catalyst for the reduction of 4-nitrophenol without noble metals.
研究领域:
材料科学
·
催化化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）