Journal of Environmental Sciences
·
2023
·
IF 6.9
Ting He,Jie Sun,Liangwei Deng,Jialin Ming,Changwei Hu
Due to its high efficiency, Fe(II)-based catalytic oxidation has been one of the most popular types of technology for treating growing organic pollutants. A lot of chemical Fe sludge along with various refractory pollutants was concomitantly produced, which may cause secondary environmental problems without proper disposal. We here innovatively proposed an effective method of achieving zero Fe sludge, reusing Fe resources (Fe recovery = 100%) and advancing organics removal (final TOC removal > 70%) simultaneously, based on the in situ formation of magnetic Ca-Fe layered double hydroxide (Fe 3 O 4 @CaFe-LDH) nano-material. Cations (Ca 2+ and Fe 3+ ) concentration (≥ 30 mmol/L) and their molar ratio (Ca:Fe ≥ 1.75) were crucial to the success of the method. Extrinsic nano Fe 3 O 4 was designed to be involved in the Fe(II)-catalytic wastewater treatment process, and was modified by oxidation intermediates/products (especially those with COO − structure), which promoted the co-precipitation of Ca 2+ (originated from Ca(OH) 2 added after oxidation process) and by-produced Fe 3+ cations on its surface to in situ generate core-shell Fe 3 O 4 @CaFe-LDH. The oxidation products were further removed during Fe 3 O 4 @CaFe-LDH material formation via intercalation and adsorption. This method was applicable to many kinds of organic wastewater, such as bisphenol A, methyl orange, humics, and biogas slurry. The prepared magnetic and hierarchical CaFe-LDH nanocomposite material showed comparable application performance to the recently reported CaFe-LDHs. This work provides a new strategy for efficiently enhancing the efficiency and economy of Fe(II)-catalyzed oxidative wastewater treatment by producing high value-added LDHs materials.
研究领域:
环境工程
·
废水处理
·
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
Desalination and Water Treatment
·
2024
·
IF 1
Dandan Lv,Yan Wang,Hui-qiang Li
Tetracycline hydrochloride (TC-HCl) was harmful to human as well as ecology due to its persistence. Layered double hydroxides (LDHs), granular activated carbon (GAC) and graphene oxide (GO) were selected as the catalyst supporting materials for the three-dimensional heterogeneous electro-Fenton (3D-EF) process. The three materials were then used to prepare catalyst particles of GAC@Fe 3 O 4 , LDHs@Fe 3 O 4 and GO@Fe 3 O 4 to degrade TC-HCl. The characterizations of the LDHs@Fe 3 O 4 (8:2) particles were done by X-ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy, energy-dispersive X-ray spectroscopy, X-ray photoelectron spectroscopy and Brunauer– Emmett–Teller. At pH of 3, the proper ratio of supporting materials (LDHs, GO, GAC) to Fe 3 O 4 improved the removal efficiency of TC-HCl. GAC@Fe 3 O 4 (8:2), LDHs@Fe 3 O 4 (8:2) and GO@Fe 3 O 4 (2:8) obtained better performance, LDHs and GO used as supporting material had better performance than GAC. Further study on the effect of different pH values showed that the LDHs@Fe 3 O 4 (8:2) acquired the highest chemical oxygen demand (COD) removal efficiency (63.03%) at pH of 7. LDHs@Fe 3 O 4 (8:2) and GO@Fe 3 O 4 (2, 8) obtained similar COD removal efficiencies at pH of 3. The percentage of Fe 2+ leaching to solution was 2% for the LDHs@Fe 3 O 4 , which was 2.9% for the GAC@Fe 3 O 4 and 5.46% for the GO@Fe 3 O 4 . Experimental results showed that more H 2 O 2 and • OH were produced on the surface of the LDHs with pH of 7. Finally, GC-MS was used to determine the degradation pathway of TC-HCl. The LDHs had obvious advantages as catalyst supporting materials for the 3D-EF process.
研究领域:
环境工程
·
水处理技术
·
催化化学
·
环境污染与控制
·
材料科学
·
环境功能材料
✓ 已验证
DOI
高影响因子
Microbiology Spectrum
·
2022
·Vol. 10
·期 6
·
IF 9.043
Jun Ren,Menghuan Yu,Wenjin Gao,Chuanfan Ding,Shengjie Li,Shaoning Yu,Wenjun Cao
Prompt clinical diagnosis and antimicrobial therapy are key to managing infective endophthalmitis. The small volume of aqueous humor, low bacterial counts, and empirical medication by physicians make existing diagnostic methods time-consuming and imprecise. Here, we investigated the feasibility of combining Fc-containing mannose-binding lectin-coated Fe3O4 (Fc-MBL@Fe3O4) enrichment with matrix-assisted laser desorption–ionization time of flight mass spectrometry (MALDI-TOF MS) profiling to identify pathogens in aqueous humor. Aqueous humor aspirated from freshly enucleated porcine eyes was treated with different inocula of Staphylococcus aureus, Staphylococcus epidermidis, and Klebsiella pneumoniae. We performed identification directly in aqueous humor samples and after short-term culture of micro-LB broth. Aqueous humor endophthalmitis samples were enriched with Fc-MBL@Fe3O4 and analyzed using MALDI-TOF MS. The identification time and minimum bacterial concentration required for identification were determined. The enrichment efficiency of Fc-MBL@Fe3O4 for different bacteria was greater than (87.5 ± 5.0)%. The objects of direct identification include live bacteria and bacteria treated with antibiotics, which can be completed within 1.5 h. The minimum number of bacteria needed for positive identification was 2.20 × 106 CFU. For micro-LB broth culture, the identification of bacteria can be completed within 6.5 to 9.5 h for aqueous humor samples with an initial bacterial count of tens to hundreds.IMPORTANCE Fc-MBL@Fe3O4 capture not only live bacteria in aqueous humor but also bacteria inactivated by antibiotics. Fc-MBL@Fe3O4 combined with micro-LB broth culture significantly reduced the turnaround time (TAT) by more than half a day by shortening the time required for bacterial identification. Our findings demonstrate that combining Fc-MBL@Fe3O4 enrichment with MALDI-TOF MS identification is a fast, sensitive, and efficient analytical method with great potential for identifying pathogens in aqueous humor samples.
研究领域:
临床微生物学
·
质谱分析
·
眼科
·
传染病学
✓ 已验证
DOI
PubMed
高影响因子
Chinese Physics B
·
2018
·Vol. 27
·期 2
·027805
·
IF 1.321
Meng Du,Xing-Zhong Cao,Rui Xia,Zhong-Po Zhou,Shuo-Xue Jin,Bao-Yi Wang
The CS/PVA/Fe3O4 nanocomposite membranes with chainlike arrangement of Fe3O4 nanoparticles are prepared by a magnetic-field-assisted solution casting method. The aim of this work is to investigate the relationship between the microstructure of the magnetic anisotropic CS/PVA/Fe3O4 membrane and the evolved macroscopic physicochemical property. With the same doping content, the relative crystallinity of CS/PVA/Fe3O4-M is lower than that of CS/PVA/Fe3O4. The Fourier transform infrared spectroscopy (FT-TR) measurements indicate that there is no chemical bonding between polymer molecule and Fe3O4 nanoparticle. The Fe3O4 nanoparticles in CS/PVA/Fe3O4 and CS/PVA/Fe3O4-M are wrapped by the chains of CS/PVA, which is also confirmed by scanning electron microscopy (SEM) and x-ray diffraction (XRD) analysis. The saturation magnetization value of CS/PVA/Fe3O4-M obviously increases compared with that of non-magnetic aligned membrane, meanwhile the transmittance decreases in the UV-visible region. The o-Ps lifetime distribution provides information about the free-volume nanoholes present in the amorphous region. It is suggested that the microstructure of CS/PVA/Fe3O4 membrane can be modified in its curing process under a magnetic field, which could affect the magnetic properties and the transmittance of nanocomposite membrane. In brief, a full understanding of the relationship between the microstructure and the macroscopic property of CS/PVA/Fe3O4 nanocomposite plays a vital role in exploring and designing the novel multifunctional materials.
✓ 已验证
产品关联
DOI
高影响因子
ANALYTICA CHIMICA ACTA
·
2022
·
IF 6.911
Shitao Feng,An Zhang,Fengshou Wu,Xiaogang Luo,Juan Zhang
In this study, a novel core-shell structured magnetic metal-organic framework nanospheres (Fe 3 O 4 @PD@BA-Zr-MOF) were fabricated by in-situ growth of boronic acid-decorated porphyrin-based metal-organic frameworks on polydopamine (PD) functionalized Fe 3 O 4 nanospheres for highly efficient enrichment of cis -diol containing nucleosides by magnetic solid phase extraction (MSPE). PD as a molecular linker promotes the nucleation and crystal growth of boronic acid-decorated porphyrin-based metal-organic framework (BA-Zr-MOF), which was synthesized via a dual-ligand strategy by using Zr 4+ as a metal unit as well as meso-tetra (4-carboxylphenyl) porphyrin (TCPP) and 1, 4-phenylenebisboronic acid (BA) as dual organic ligands. It is worth noting that the nitrogen-rich skeleton of TCPP and abundant boric acid groups in MOF allows for effective and selective enrichment of cis -diol containing compounds by hydrophilic interaction and boron affinity. Also, Zr 4+ well assembled into the MOF is beneficial to extraction via metal oxide affinity interaction due to reversible covalent complex formation/dissociation between Zr and cis -diol compounds. The morphology, structure and saturation magnetization of Fe 3 O 4 @PD@BA-Zr-MOF were systematically characterized. The as-prepared adsorbent coupled with high performance liquid chromatography was used for analysis of four nucleosides including cytidine , uridine , guanosine , and adenosine in urine sample with the detection limits in range of 0.002–0.005 μg mL −1 and the quantitative limits in range of 0.008–0.018 μg mL −1 . The as-fabricated Fe 3 O 4 @PD@BA-Zr-MOF nanospheres shows high selectivity , low detection limit, excellent reusability and reproducibility for nucleosides enrichment. The large specific surface area and quick magnetic response performance endow the affinity magnetic nanospheres with outstanding enrichment capability for rapid extraction. The adsorbent of Fe 3 O 4 @PD@BA-Zr-MOF nanospheres has great potential for identification and analysis of trace cis -diol containing nucleosides in biological samples.
研究领域:
分析化学
·
材料科学
·
纳米技术
·
生物医学工程
✓ 已验证
DOI
高影响因子
Materials
·
2024
·Vol. 17
·期 2
·509
·
IF 3.1
Shuya Ning,Shuo Wang,Zhihui Liu,Naming Zhang,Bin Yang,Fanghui Zhang
Magnetic–plasmonic nanoparticles (NPs) have attracted great interest in many fields because they can exhibit more physical and chemical properties than individual magnetic or plasmonic NPs. In this work, we synthesized Au- or Ag-decorated Fe3O4nanoparticles coated with PEI (Fe3O4-PEI-M (M = Au or Ag) NPs) using a simple method. The influences of the plasmonic metal NPs’ (Au or Ag) coating density on the magnetic and plasmonic properties of the Fe3O4-PEI-M (M = Au or Ag) NPs were investigated, and the density of the plasmonic metal NPs coated on the Fe3O4NPs surfaces could be adjusted by controlling the polyethyleneimine (PEI) concentration. It showed that the Fe3O4-PEI-M (M = Au or Ag) NPs exhibited both magnetic and plasmonic properties. When the PEI concentration increased from 5 to 35 mg/mL, the coating density of the Au or Ag NPs on the Fe3O4NPs surfaces increased, the corresponding magnetic intensity became weaker, and the plasmonic intensity was stronger. At the same time, the plasmonic resonance peak of the Fe3O4-PEI-M (M = Au or Ag) NPs was red shifted. Therefore, there was an optimal coverage of the plasmonic metal NPs on the Fe3O4NPs surfaces to balance the magnetic and plasmonic properties when the PEI concentration was between 15 and 25 mg/mL. This result can guide the application of the Fe3O4-M (M = Au or Ag) NPs in the biomedical field.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2018
·
IF 3.909
Yikang Yan,Gutha Yuvaraja,Chunjiang Liu,Lingjun Kong,Kai Guo,Guda Mallikarjuna Reddy,Grigory V. Zyryanov
Lead is one of the highly toxic metals reaching the water bodies from industries and discarded domestic wastes. Chitosan and its derivatives can be used to modify magnetic materials to promote the adsorption properties of the magnetic materials for the removal of metal ions. The obtained ECCSB@Fe 3 O 4 was characterized by XRD, FTIR, SEM, TEM and VSM analysis. The effect of solution pH, adsorbent dosage, contact time , initial metal ion concentration and temperature effect was studied. The results of the batch sorption kinetic experiments were substituted into the pseudo-first order, pseudo-second order and intraparticle diffusion models. The R 2 and SSE results show that pseudo-second order equation describes the sorption process very well. Adsorption process revealed that the initial uptake of Pb(II) was rapid and equilibrium was achieved within 105 min. Langmuir and Freundlich adsorption isotherm models were applied to represent adsorption isotherm data. The equilibrium data were well fitted by the Langmuir isotherm model by revealing the maximum sorption capacity value 86.20 mg/g of ECCSB@Fe 3 O 4 . Different thermodynamic parameters, namely, changes in standard Gibbs energy, enthalpy, and entropy, were also evaluated from the temperature dependence, and the results suggest that the adsorption reaction is spontaneous and endothermic in nature.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2024
·
IF 7.1
Jiancong Kang,Chuanshuang Hu,Xiaoqi Liu,Hongyang Zhou,Xiuyi Lin,Jin Gu
A facile one-pot method was reported for synthesizing magnetic cellulose nanocrystals (CNC) loaded with iron tetroxide (Fe3O4) nanoparticles. Initially, microcrystalline cellulose (MCC) was treated with a 1 M solution of ferric chloride (FeCl3) and hydrolyzed into CNCs. The FeCl3 played a dual role, acting both as a cellulose hydrolytic medium and as an Fe3O4 precursor. Subsequently, CNCs served as a stabilizing and sole reducing agent for the in situ formation of Fe3O4 nanoparticles during the solvothermal reaction. The impact of the cellulose substrate, reaction solvent, solvothermal time, and MCC solid-to-liquid ratio on the growth, morphology, and crystal structure of ferrite was investigated. Pure and small sphere-like Fe3O4 (∼30 nm) nanoparticles were successfully immobilized and reduced on the CNC surface when ethanol was used, and the solvent heating time was extended to 3–30 h. Complete reduction of Fe3+ to Fe3O4 was achieved when the MCC solid to FeCl3 solution ratio was higher than 1 g:75 mL. Under optimized conditions, the resulting CNC/Fe3O4 hybrid contained 33.3% Fe3O4 and exhibited a maximum saturation magnetization (Ms) value of 22.0 emu/g with low coercivity, making it promising for a wide range of applications.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2016
·
IF 3.014
Cheng-Lu Liang,Yang Liu,Rui-Ying Bao,Yong Luo,Wei Yang,Bang-Hu Xie,Ming-Bo Yang
Well dispersed Fe 3 O 4 nanoparticle suspensions with grain size of about 9 nm were coprecipitated and then compounded with different amount of GO (graphite oxide) followed by reduction of GO to obtain Fe 3 O 4 /rGO (reduced graphite oxide) composites with different component ratios. The as-obtained Fe 3 O 4 /rGO composites were used as anode materials for lithium ion batteries to investigate the best component ratio of the composite for the cycling performance. Fe 3 O 4 /rGO composite electrode containing 44.9 wt% Fe 3 O 4 displayed the best cycling capacity of above 300 mA h g −1 at 1000 mA g −1 after 100 cycles and it was interesting to find that the trend of impedance spectra of Fe 3 O 4 /rGO electrodes after some cycles of electrochemical reactions can be well related to the overall cycling performances.
✓ 已验证
产品关联
DOI
高影响因子
Desalination and Water Treatment
·
2025
·
IF 1
An Nang Vu,Ngoc – Hoa T. Le,Thanh- My T. Nguyen,Uyen N. Nguyen-Thai,Kim – Phung L. Nguyen,Lan Duc Vu
We present a straightforward method for creating reusable magnetic Fe 3 O 4 /Ag catalysts. Three distinct Fe 3 O 4 varieties were synthesized using different methods, and Ag nanoparticles were deposited onto the Fe 3 O 4 matrix via a hydrothermal process. The resulting Fe 3 O 4 and Fe 3 O 4 /Ag materials were characterized by XRD, XPS, FT-IR, Raman, DLS, FE-SEM, TEM, EDX, VSM, and UV-Vis spectroscopy. XRD analysis of the Fe 3 O 4 particles synthesized using the solvothermal reduction process (S2) revealed firm diffraction peaks, indicating high crystallinity. After hydrothermal treatment, S2/Ag retained a hollow spherical morphology and magnetic properties similar to Fe 3 O 4 . The synthesized Fe 3 O 4 /Ag catalytic performance was evaluated for the reduction of 4-nitrophenol (4-NP) and methyl orange (MO) dye in the presence of NaBH 4 . All catalysts effectively reduced both dyes and could be magnetically separated from the aqueous solution. The P1/Ag catalyst achieved over 95 % reduction of MO and 4-NP within 2 minutes. S2/Ag exhibited superior stability, preventing Ag leaching during the reaction. Furthermore, its high saturation magnetization allows easy magnetic extraction from the solution. These findings strongly suggest S2/Ag as a promising catalyst due to its selectivity and advantageous properties.
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2020
·
IF 4.939
Chongqi Chen,Hongju Ren,Jianke Zhou,Yu Luo,Yingying Zhan,Chaktong Au,Xingyi Lin,Lilong Jiang
Two precursors, namely, p -CFO- T (tetragonal) and p -CFO- C (cubic), were fabricated by a sol-gel method via citric acid and poly(vinyl alcohol) complexation, respectively. After H 2 -reduction, the two were converted to Cu/Fe 3 O 4 catalysts of different complexions, which are named as CFO-CA and CFO-PVA, respectively. The distribution of Fe 2+ and Fe 3+ in the Cu/Fe 3 O 4 catalysts was studied by Raman and XPS techniques. It was disclosed that the distribution of Fe 2+ and Fe 3+ in Fe 3 O 4 has an effect on Cu–Fe 3 O 4 interaction and catalyst surface basicity . Compared to CFO-PVA, CFO-CA has a larger amount of Fe 3+ , which mostly sits at the octahedral sites, leading to stronger Cu–Fe 3 O 4 interaction, and a larger amount of catalyst surface sites that are of weak basicity. As a result, the critical elementary steps of WGS reaction , viz. water dissociation, –COOH decomposition and CO 2 desorption are promoted as reflected in the lower E a and higher catalytic activity of CFO-CA.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF RARE EARTHS
·
2024
·
IF 5.2
Tianhao Xia,Yuwen Yuan,Yunpeng Wang,Pragati Awasthi,Wenkun Dong,Xvsheng Qiao,Dong Chen,Shisheng Ling,Xianping Fan
This study aims to advance the development of magnetic fluorescent polymer microspheres for biomedical detection applications. Conventionally, dopants have utilized europium(III) (Eu(III)) organic complexes due to their high compatibility with polymers and strong fluorescence. However, as the common magnetic material Fe 3 O 4 can quench their fluorescence, it is hard to synthesize Eu complex-doped magnetic fluorescent materials. To maintain fluorescence in the presence of magnetic parts, in this work, we synthesized Eu-doped magnetic microspheres with multi-layered structure. Firstly, poly-(glycidyl methacrylate) (PGMA) microspheres were prepared as templates and subsequently coated with layers of Fe 3 O 4 and SiO 2 . Then, the synthesized Eu(TTA) 3 (TPPO) 2 were added into PGMA@Fe 3 O 4 @SiO 2 microspheres in either basic or acidic conditions, and covered them with an extra sol–gel layer of silica at the same time. The microspheres exhibit a core–shell structure with sub-micron dimensions (580 nm) and possess favorable superparamagnetic properties ( M s = 22.02 A·m 2 /kg, M r = 1.37 A·m 2 /kg, H c = 0.242 A/m). But the fluorescence of Eu 3+ are significantly quenched by Fe 3 O 4 , O–H oscillators, and N–H oscillators. Finally, to exclude the quenching mentioned above, the first pure SiO 2 shielding layer and the second Eu(TTA) 3 (TPPO) 2 -dispersed SiO 2 layer were coated onto PGMA@Fe 3 O 4 microspheres to prevent the energy transfer due to the quenching centers and hold the fluorescence of Eu 3+ . These findings underscore the considerable potential of these microspheres exhibiting rapid magnetic separation and stable fluorescence for bioimaging and biosensing applications.
✓ 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）