APPLIED CATALYSIS B-ENVIRONMENTAL
·
2021
·
IF 19.503
Shenghua Ye,Yaqi Lei,Tingting Xu,Lirong Zheng,Zhida Chen,Xiuyuan Yang,Xiangzhong Ren,Yongliang Li,Qianling Zhang,Jianhong Liu
In this study, phosphate FeCo(H 3 O)(PO 4 ) 2 nanosheet arrays (NAs) were synthesized using an electrochemical strategy. FeCo(H 3 O)(PO 4 ) 2 NAs as precatalyst could undergo significant self-reconstruction, including leaching of phosphate anions and electro-oxidation of Co 2+ during anodizing at the potential range of oxygen evolution reaction (OER) in 1 M KOH solution, eventually resulting in the formation of Fe 0.5 Co 0.5 OOH NAs with low crystallinity . The high content of Fe in Fe 0.5 Co 0.5 OOH NAs promoted the formation of active Fe 3+ –O–Fe 3+ motifs that increased OER occurrence. Additionally, Fe incorporation increased the ratio of the reaction rate constants of oxygen evolution to Co 3+ /Co 4+ (k OER /k M,ox ) and enhanced the reaction order on the hydroxyl ion . These factors significantly contributed to the outstanding OER catalytic performances of Fe 0.5 Co 0.5 OOH NAs.
研究领域:
材料科学
·
电化学
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DOI
高影响因子
ENVIRONMENTAL POLLUTION
·
2022
·
IF 9.988
Yao Tang,Jibo Dou,Zhijiang Lu,Jianming Xu,Yan He
The sluggish Fe 3+ /Fe 2+ cycle was the rate-limiting step in the Fenton-like reaction, and metal-free carbonaceous materials are considered as emerging alternatives to solve this problem. However, the effect of carbon material properties on the distribution of reactive species remains poorly understood. This study investigated the possibility and mechanism of using biochar to accelerate the Fe 3+ /Fe 2+ cycle to overcome the low efficiency of Fe 3+ /persulfate (PS) catalytic oxidation of phenanthrene . More importantly, the contribution of reactive species in the reaction systems with the variation of biochar pyrolysis temperatures was quantitatively studied. The results showed that medium-temperature derived biochar (BC500) had the greatest ability to enhance the Fenton-like system compared to the low- and high-temperature (BC350/700), and the first-order rate constant achieved 5.2 and 35.7-fold increase against the biochar/PS and Fe 3+ /PS systems, respectively. Using electrochemical evidence, sulfoxide probe tests, and steady-state concentration calculations, radicals yields were found to rise and then reduce with decreasing pyrolysis temperature, while the nonradical contribution of Fe(IV) increased to 56.3%. Electron paramagnetic resonance, Boehm titration, and Raman spectroscopy unraveled that the enhanced effect of biochar resulted from itself persistent free radicals, phenolic-OH, and edge defects, which enabled electron transfer between Fe 3+ and biochar. Fe 2+ was thus continuously generated and effectively activated the PS. This work enables a better understanding of the Fe 3+ -mediated Fenton-like reaction in the presence of biochar and provides a sustainable green strategy for Fenton chemistry with potential applications.
研究领域:
环境科学
·
催化化学
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产品关联
DOI
PubMed
高影响因子
CHEMOSPHERE
·
2022
·
IF 8.943
Yanlin Zhang,Wei Chu
In this study, a Fe 3+ /g-C 3 N 4 hybrid catalyst system was proposed to activate peroxymonosulfate (PMS) for the metronidazole (MNZ) photocatalytic degradation . The two catalysts, Fe 3+ and g-C 3 N 4 , exhibited an obvious synergistic effect in the photocatalytic degradation process. When 1 mM PMS, 0.04 mM Fe 3+ and 0.05 g L −1 g-C 3 N 4 were applied, the rate constant of the Fe 3+ /g-C 3 N 4 /PMS/LED process at 0.07288 min −1 is around 3.6 to 6.8 times faster than that of Fe 3+ /PMS/LED and g-C 3 N 4 /PMS/LED processes at 0.0198 and 0.01076 min −1 , respectively. Under visible light, electron transfer from photo-activated g-C 3 N 4 to Fe 3+ , resulting in the continuous regeneration of Fe 2+ in the system, which ensures non-stopping production of radicals for MNZ degradation. UV–visible spectra were used to confirm the regeneration of Fe 2+ . In addition, EPR tests were used to identify the reactive oxygen species involved in the reaction system. Typically, the effects of various operation parameters, including the catalyst dosage, PMS dosage, initial concentration of MNZ and initial pH were examined. This work provided a new idea of promoting pollutant degradation by accelerating Fe 3+ /Fe 2+ redox through semiconductor, which could help to use the catalyst more effectively for wastewater treatment and/or chemical industries.
研究领域:
环境科学
·
化学工程
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产品关联
DOI
PubMed
高影响因子
CARBOHYDRATE POLYMERS
·
2019
·
IF 6.044
Yu Bai,Yun Zhao,Yang Li,Jiachao Xu,Xiaoting Fu,Xin Gao,Xiangzhao Mao,Zhaoyong Li
In this study, we fabricated a soft, transparent UV-shielding film (Alg-Fe 3+ -EDTA) by crosslinking sodium alginate with a ferric ion solution containing EDTA. The obtained films were characterized via SEM, ATR-FTIR, XRD, TG and DTG; the results indicated that the synergistic gelation of ferric alginate and alginic acid existed in Alg-Fe 3+ -EDTA film. The Alg-Fe 3+ -EDTA film performance to be optimized under the following conditions: 1.6% Fe 3+ , 0.8% EDTA, and crosslinking duration of 12 min. The Alg-Fe 3+ -EDTA film had high visible light transmittance, the UV-C (200–280 nm) and UV-B (280–315 nm) shielding rates were 100%, and the UV-A (315–400 nm) shielding rate was 98.37%; the UPF reached 50+; additionally, the tensile strength and elongation-at-break were 56.85 MPa and 10.45%, respectively, and still have ultraviolet shielding effect under water environments or after strong light irradiation. This work provides an efficient method to improve the optical and mechanical ability of ferric alginate films.
研究领域:
材料科学
·
生物医学工程
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产品关联
DOI
PubMed
高影响因子
Royal Society Open Science
·
2018
·Vol. 5
·期 8
·
IF 2.504
Liuyi Ren,Hang Qiu,Wenqing Qin,Ming Zhang,Yubiao Li,Penggang Wei
The existence of metal ions should not be ignored in both hydrometallurgy and flotation. In this study, the effects of Ca2+, Mg2+ and Fe3+ on the flotation performance of cassiterite using octanohydroxamic acid (OHA) as the collector were investigated by micro-flotation tests, X-ray photoelectron spectroscopy (XPS), Fourier transform infrared (FTIR) spectroscopy, contact angle, zeta (ζ) potential measurements and atomic force microscopy (AFM) imaging. The results of the flotation and contact angle experiments showed that the addition of Ca2+, Mg2+ and Fe3+ significantly decreased both the recovery and contact angle of cassiterite with pH ranged from 6.0 to 12.0 in the presence of OHA collector. ζ-Potential measurements, solution chemistry analysis and FTIR measurements indicated that the flotation recovery of the cassiterite declined due to the CaOH+, MgOH+ and Fe(OH)3 sites on the cassiterite surface. XPS results indicated that the chemisorption of OHA and calcium ions on the cassiterite surface finally changed its chemical properties. The AFM images also revealed that new species Fe(OH)3 of Fe3+ formed and adsorbed on the cassiterite surface at pH 9.0. The adsorption of Fe(OH)3 reduced the adsorption of OHA on the cassiterite surface, thus the hydrophobicity of cassiterite was deteriorated.
研究领域:
矿物加工工程
·
表面化学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Kang Cheng,Weichao Huang,Xinyue Liu,Xinyong Gong,Chaoyong Deng
ABSTRACT Broadband near-infrared spectroscopy has become a research hotspot because it can be used in many fields. For the preparation of near-infrared phosphors, non-toxic and harmless Fe 3+ is an excellent activator. Herein, Fe 3+ -activated NaAl 5 O 8 near-infrared phosphors were prepared, the phase and the properties of luminescence were analyzed. Under the excitation of 346 nm, the NaAl 5 O 8 :Fe 3+ phosphors emit 600–850 nm light, 754 nm is the emission peak of the sample. The optical band gap of NaAl 5 O 8 :Fe 3+ was evaluated. It was observed that the optical band gap of sample narrows as the doping concentration of Fe 3+ increases. By measuring the emission spectra at 303–463 K, it is evident that the emission intensity remains 83.1 % of 303 K at 423 K. It shows that the thermal stability of the sample is good. The luminescence of the sample after soaking in deionized water for 0–10 h were observed. These results indicate that the NaAl 5 O 8 :Fe 3+ samples have application prospects in some high temperature or wet fields. Moreover, the security ink was prepared by using NaAl 5 O 8 :Fe 3+ , indicating that the sample can be used in the field of anti-counterfeiting.
研究领域:
材料科学
·
光学
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产品关联
DOI
高影响因子
Journal of Applied Spectroscopy
·
2023
·Vol. 90
·期 3
·670-675
·
IF 0.7
Yan Kexin,Li Jinlan,Zheng Yuansong,Yan Zihong
Carbon dots (CDs) are of great significance for metal ion detection. Herein, CDs without surface functional groups were synthesized through a simple one-step hydrothermal method using 4,4'-bipyridine as the carbon source. The results showed that the synthesized CDs have good selectivity for Fe 3+ detection, and the CDs respond well to metal ions as Lewis bases. This detection method is unlikely to be affected by sewage systems because it has excellent sensitivity. The detection range for Fe 3+ concentrations is between 1.0 × 10 –8 and 1.0 × 10 2 mol/L, and the detection limit is 1.0 × 10 –8 mol/L.
研究领域:
分析化学
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环境科学
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DOI
高影响因子
ACS Omega
·
2024
·
IF 3.7
Shiqiang Hou,Ning Lin,Yi Wang
Red-emitting fluorescent carbon dots (CDs) have garnered significant attention due to their wide-ranging applications in biological fields. However, challenges such as complex precursors, labor-intensive preparation processes, and low quantum yields have hindered their broader utilization. In this study, we developed a simple and efficient solvothermal method to synthesize fluorescent CDs with tunable emission wavelengths using aniline derivatives as precursors. The emission wavelengths of the synthesized CDs were influenced by the functional groups at the para-position of the aniline derivatives with stronger electron-donating effects leading to a red shift in emissions. Notably, bright red-emitting CDs with a quantum yield of 19.42% and excellent photobleaching resistance were obtained by using p-phenylenediamine as the sole precursor. These CDs exhibited sensitivity to Fe3+ ions, demonstrating a strong linear detection range (R2 = 0.999) from 0 to 50 μM. Additionally, the CDs were uniform in size (2–5 nm), emitted stable red fluorescence in pH conditions ranging from 4 to 10, and were successfully internalized by glioma cells, enabling precise fluorescence imaging of gliomas both in vitro and in vivo.
研究领域:
生物医学工程
·
材料科学
·
肿瘤学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Chengbo Bai,Yuhan Zhang,Qiong Liu,Chengxin Zhu,Jun Li,Rong Chen
To address the observed decrease in efficiency during Fe 2+ -mediated persulfate (PDS) activation caused by slow electron transfer rates and challenges in cycling between Fe 3+ /Fe 2+ states, we devised a strategy to establish interfacial complexation between Fe 3+ and Bi 2 MoO 6 in the presence of PDS. The proposed approach facilitates more efficient capture of photogenerated electrons, thereby accelerating the rate-limiting reduction process of the Fe 3+ /Fe 2+ cycle under visible light irradiation and promoting PDS activation. The Bi 2 MoO 6 /Fe 3+ /PDS/Vis system demonstrates complete degradation of organic pollutants, including Atrazine (ATZ), carbamazepine (CBZ), bisphenol A (BPA), and 2,4-dichlorophenol (DCP) at a concentration of 10 mg/L within a rapid reaction time of 30 min. Radical scavenging experiments and electron paramagnetic resonance spectra (EPR) confirm that the sulfate radical (•SO 4 − ) is the dominant species responsible for organic contaminant degradation. The real-time conversion process between Fe 3+ and Fe 2+ was monitored by observing changes in iron species forms and concentrations within the reaction system. X-ray photoelectron spectroscopy (XPS) and Raman spectroscopy verify the formation of a complexation between Fe 3+ and Bi 2 MoO 6 , facilitating anchoring of Fe 3+ onto material surface. Based on these findings, we propose a reliable mechanism for the activation reaction. This work presents a promising heterogeneous PDS activation method based on Fe 3+ /Fe 2+ cycle for water treatment.
研究领域:
环境科学
·
化学
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产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2024
·Vol. 14
·期 8
·4990-5000
·
IF 3.9
Fuhua Huang,Cong Liu,Zhuoya Zhao,Li Wang,Jinglai Zhang,Hans Ågren,Jerker Widengren,Haichun Liu
This work details the synthesis of paramagnetic upconversion nanoparticles doped with Fe3+ in various morphologies via the thermal decomposition method, followed by comprehensive characterization of their structures, optical properties and magnetism using diverse analytical techniques. Our findings demonstrate that by precisely modulating the ratio of oleic acid to octadecene in the solvent, one can successfully obtain hexagonal nanodiscs with a consistent and well-defined morphology. Further adjustments in the oleic acid to octadecene ratio, coupled with fine-tuning of the Na+/F− ratio, led to the production of small-sized nanorods with uniform morphology. Significantly, all Fe3+-doped nanoparticles displayed pronounced paramagnetism, with magnetic susceptibility measurements at 1 T and room temperature of 0.15 emu g−1 and 0.14 emu g−1 for the nanodiscs and nanorods, respectively. To further enhance their magnetic properties, we replaced the Y-matrix with a Gd-matrix, and by fine-tuning the oleic acid/octadecene and Na+/F− ratios, we achieved nanoparticles with uniform morphology. The magnetic susceptibility was 0.82 emu g−1 at 1 T and room temperature. Simultaneously, we could control the nanoparticle size by altering the synthesis temperature. These upconversion nanostructures, characterized by both paramagnetic properties and regular morphology, represent promising dual-mode nanoprobe candidates for optical biological imaging and magnetic resonance imaging.
研究领域:
纳米技术
·
材料科学
·
生物医学工程
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产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2021
·
IF 6.953
Die Wang,Luminita Marin,Xinjian Cheng
The detection of heavy metals, such as Hg 2+ and Fe 3+ , is of great significance. In this work, fluorescent small-molecule BODIPY (BY-3) bearing C C group was synthesized firstly. And then, the chitosan-based polymer sensor CY-1 was synthesized through the spontaneous NH 2 /C≡C click reaction. The synthesized CY-1 can effectively bind and recognize Hg 2+ /Hg + by the –C=N groups formed in the click reaction. Moreover, the macromolecular sensors CS-1 and CS-2 were synthesized by incorporating another recognition sites to CY-1. These synthesized macromolecular sensors can not only recognize Hg 2+ /Hg + , but also effectively recognize Fe 3+ /Fe 2+ . All of them exhibited significant quenching effect, visible to the naked eye under UV irradiation. The detection limit of CY-1 for Hg 2+ was 1.51 × 10 −6 mol/L, and the detection limit of CS-2 for Fe 3+ was 2.30 × 10 −6 mol/L. The BODIPY-chitosan sensors synthesized in this work have the functions of removing heavy metal ions besides the identifying ability. The maximum adsorption capacity of 1 g chitosan to Hg 2+ was 108 mg as the best one. This article provides a new method to prepare macromolecular sensors for the detection and removal of heavy metal ions. As a useful natural polymer, chitosan's application scope was enlarged.
研究领域:
化学传感器
·
环境科学
·
材料科学
✓ 已验证
DOI
PubMed
高影响因子
Nanoscale
·
2015
·Vol. 7
·期 12
·5395-5402
·
IF 7.394
Shao-jie Li,Da Li,Wei Liu,Zhidong Zhang
Monoclinic Fe3−xCrxSe4 nanostructures (0 ≤ x ≤ 2.5) were synthesized using a high-temperature solution chemical method. With increasing the Cr doping, the peak positions in the X-ray diffraction (XRD) patterns of Fe3−xCrxSe4 nanostructures slightly shifted to lower 2θ values due to the changes in lattice parameters. Expansions in the unit cell volumes of Fe3−xCrxSe4 nanostructures (x > 0.3) may have been responsible for enhancing the ferromagnetic (FM) interaction between magnetic ions, which resulted in a significant increase in the Curie temperature (TC) from 331 K for Fe3Se4 to 429 K for FeCr2Se4, distinctly differing from the magnetic properties of the corresponding bulk materials. A room-temperature coercivity (HC) analysis showed an obvious increase from 3.2 kOe for Fe3Se4 to 12 kOe for Fe2.3Cr0.7Se4 nanostructure, but gradually decreased upon further increasing the Cr content.
研究领域:
材料科学
·
物理学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）