SEPARATION AND PURIFICATION TECHNOLOGY
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2024
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IF 8.1
Yinchuan Yang,Yumin Zhu,Jiabin Chen,Xuefei Zhou,Yalei Zhang
Advanced oxidation processes based on peroxymonosulfate (PMS) hold remarkable promise for addressing emerging organic pollutants (EOPs) and are worthy of systematic investigation. However, the existing technology has not been widely applied due to bottlenecks such as reaction efficiency. Herein, we proposed a novel system incorporating nitrilotriacetic acid (NTA) as a functional ligand to enhance the activation of PMS by Fe 3 O 4 , thereby facilitating a better efficiency for the degradation of EOPs. Results indicated that the system can achieve an optimal removal rate of 99.6% for atrazine (ATZ) in the presence of NTA. Quenching experiments and electron paramagnetic resonance techniques were employed for mechanism exploration. The results revealed that the enhanced Fe(II)/Fe(III) cycling on the surface of Fe 3 O 4 , triggered by the addition of NTA, accelerates the reduction of trivalent iron and continuously activates PMS to generate radicals, particularly SO 4 − . The mechanistic analysis showed that in the first stage, the lower degradation efficiency could due to the self-quenching of the free radicals, with the uncomplexed Fe(II) and Fe(III) on the surface, the free NTA in the solution, or with the PMS, in addition to reacting with the pollutants. In the second stage, the ATZ achieved rapid degradation as the concentration of substances competing for free radicals decreased. Our work elucidates the key role of NTA functional ligand in the Fe 3 O 4 /PMS advanced oxidation processes, which may provide new approach for the efficient degradation of EOPs.
研究领域:
环境科学
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化学
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产品关联
DOI
高影响因子
RSC Advances
·
2017
·Vol. 7
·期 81
·51142-51150
·
IF 3.108
Ruilian Li,Jian Zhao,Fengxia Yang,Yingchao Zhang,Daniele Ramella,Yu Peng,Yi Luan
A novel magnetic Fe3O4@P4VP(poly(4-vinylpyridine))@FeCl3 core–shell structure was successfully synthesized. Its Fe3O4@P4VP core was initially prepared via polymerization of 4-vinyl pyridine on the surface of Fe3O4 microspheres. The successful introduction of the FeCl3 moiety as a catalytic active site was achieved through coordination interaction between P4VP and FeCl3. The obtained Fe3O4@P4VP@FeCl3 catalyst was applied in the selective oxidation of alcohols using molecular oxygen as the oxidant. It was shown that a variety of alcohol substrates is tolerated under optimized reaction conditions. Additionally, benzylic oxidation of hydrocarbon compounds was also evaluated using Fe3O4@P4VP@FeCl3 as the catalyst and tBuOOH as the oxidant, achieving high yields and very good selectivities. The heterogeneity of the Fe3O4@P4VP@FeCl3 core–shell catalyst was tested and the initial activity was maintained after five reuses.
研究领域:
化学
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催化科学
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DOI
高影响因子
CHEMOSPHERE
·
2018
·
IF 4.427
Huiwang Dai,Shuying Xu,Jianxin Chen,Xiaozeng Miao,Jianxi Zhu
Oxalate enhanced mechanism of Fe 3 O 4 @γ-Fe 2 O 3 was developed to provide novel insight into catalytic process regulation of iron oxide catalysts in heterogeneous UV-Fenton system. And the iron oxide composite of Fe 3 O 4 @γ-Fe 2 O 3 was characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), fourier transform infrared (FTIR) spectroscopy and nitrogen adsorption-desorption isotherms. The results showed that large amount of iron could be leached from catalyst in the presence of oxalate, which promoted the homogeneous UV-Fenton reactions in solution. Orange II degradation could be significantly enhanced with the increase of the ratio of homogeneous UV-Fenton process to heterogeneous UV-Fenton process. The optimum concentration of oxalate determined by experiment was 0.5 mM in oxalate enhanced heterogeneous UV-Fenton system. On this condition, the pseudo-first-order rate constant value of Orange II degradation was 0.314 min −1 , which was 2.3 times as high as that in heterogeneous UV-Fenton system. The removal rates of color and TOC were 100% and 86.6% after 20 min and 120 min treatment, respectively. In addition, the iron ions in solution could be almost completely adsorbed back to the catalyst surface in later degradation stages of Orange II. During the recycle experiments, the results showed that the increase of pH in solution and the sorption of intermediates on the catalyst surface would hinder oxalate enhanced process and lead to a decrease of degradation rate of Orange II in oxalate enhanced heterogeneous UV-Fenton system.
研究领域:
环境科学
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催化化学
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DOI
高影响因子
SOLAR ENERGY MATERIALS AND SOLAR CELLS
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2024
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IF 6.3
Maoqing Tang,Cong Qi,Linfei Yue
As an environmentally friendly seawater desalination method, solar interface evaporation is considered to be a promising solution to ease the freshwater shortage. In this paper, porous Cu-Fe 3 O 4 /sodium alginate/polyacrylamide hydrogel was prepared by double chemical crosslinking method using sodium alginate, polyacrylamide and Cu-Fe 3 O 4 nanoparticles with good SPR effect as raw materials. The effects of Cu-Fe 3 O 4 nanoparticle concentration, light intensity and salt water concentration on the evaporation performance of hydrogel evaporator were studied. It was found that under the light intensity of 1 sun, the evaporation efficiency and thermal efficiency of 3.5 wt% seawater in the hydrogel evaporator containing Cu-Fe 3 O 4 nanoparticles with a concentration of 0.26 % can reach 64.7 % and 95.24 %, respectively. In addition, the Cu-Fe 3 O 4 /sodium alginate/polyacrylamide hydrogel evaporator has good reusability and salt self-cleaning ability. The seawater desalination experiment in real environment shows that the hydrogel evaporator with low cost benefit has broad application prospects in the field of seawater desalination.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
ENVIRONMENTAL TECHNOLOGY
·
2024
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IF 2.2
Mengzhao Li,Wei Dong,Yu Tong,Penghao Gao,Jinkai Pan,Junjie Wang,Wenle Kong,Peiling Gao,Xinpeng Liu
Magnetic Fe3O4 nanoparticles were added into the aqueous phase to form nanofluid systems, in which ozone was used for the oxidation of tetracycline hydrochloride (TC) in the solution. The nanomaterials were characterized using SEM, XRD, EDS, and FT-IR. The effects of nanoparticles size, addition ratio, and number of cycles on the process of ozone oxidation of TC were investigated. The results indicated that the addition ratio of nanoparticles have a certain impact on the performance of ozone oxidation. When the addition ratio increased from 0.02% to 0.4%, the removal rate of TC in the solution was improved significantly. Besides, the particle size of nanoparticles showed a greater impact on ozone oxidation. At the nanoscale, Fe3O4 nanoparticles exhibited significant strengthening properties, which is attributed to the construction of nanofluid systems. The removal rate of TC in solution decreased obviously with the increase of nanoparticles size. The Fe3O4 nanoparticles with particle size of 20 nm showed the most significant effect on TC degradation. The recycling experiment showed that magnetic Fe3O4 nanoparticles had stable regeneration performance. For three times of recycling treatment, with a Fe3O4 addition ratio of 0.4%, the removal rate of TC reached 98.7%, 97.21%, and 96%, respectively. Based on the characterization results, the strengthening mechanism was analyzed. The experimental results indicated that construction of nanofluids systems could improve the utilization rate of ozone, and Fe3O4 nanoparticles were reusable and easily recyclable.
研究领域:
环境科学
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纳米技术
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化学工程
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产品关联
DOI
PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2024
·Vol. 49
·期 2
·435-446
·
IF 2.7
Haidong Lu,Congming Tang,Kai Ma,Xinli Li
Peroxymonosulfate (PMS) activation is a powerful method for eliminating tetracycline (TC) from water. Herein, the morphology and phosphorization were investigated for efficient PMS activation toward TC degradation over magnetic Fe3O4 catalysts. For three kinds of Fe3O4 catalyst with different morphologies, phosphorization dramatically enhanced the catalytic performance for TC degradation. A unique morphological effect was also observed for the TC degradation process. By regulation of morphology and phosphorization, the P-RC-Fe3O4/PMS system achieved the highest TC degradation efficiency among evaluated catalyst systems. Due to phosphorization, electron transfer occurred from Fe to P, generating a charge imbalance between Feδ+ and Pδ−, which reacted with PMS to produce rich active species such as ˙OH, SO4˙−, O2˙− and 1O2 for TC degradation. These active species were confirmed by using quenching experiments with different scavengers and ESR measurements. These results revealed that the nonradical (1O2) pathway was dominant in the P-RC-Fe3O4/PMS system for TC degradation, but simultaneously the radical (˙OH, SO4˙− and O2˙−) pathway made a certain contribution. Cyclic experiments demonstrated not only the excellent stability of the P-RC-Fe3O4/PMS system for TC degradation but also facile magnetic separation between the catalyst and the reaction system. This work provides an efficient strategy for constructing novel catalytic platforms by regulation of morphology and phosphorization to activate PMS for eliminating TC from water.
研究领域:
环境科学
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催化化学
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产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2022
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IF 9.965
Qingpeng Zhu,Jiaojiao Song,Zhaofei Liu,Konglin Wu,Xiangzi Li,Zhiming Chen,Huan Pang
Efficient and convenient degradation of industrial organic pollutants are of great importance for green chemical schemes and cost-effectiveness. This work introduced the immobilization of laccase on Fe 3 O 4 @SiO 2 nanoparticles (Fe 3 O 4 @SiO 2 -laccase) for photothermal catalytic degradation of textile dyes. The Fe 3 O 4 @SiO 2 -laccase presented excellent reusability, improved thermal and pH stabilities, and remarkable organic compounds, inhibitors and metal ions tolerance. Batch experiments indicate that the maximum loading amount and activity recovery for laccase were about 10.5 mg/g and 109.7%, respectively. Meanwhile, the immobilized laccase was employed for photothermal catalytic degradation of textile dyes. The degradation assays revealed that the initial removal efficiencies were 99.6%, 99.5%, 94.6%, 94.2%, 89.4% and 79.3% for high concentrations of malachite green (MG), brilliant green (BG), reactive blue 19 (RB19), azophloxine, procion red MX-5B and alizarin red in 30–60 min illumination, respectively. Even after 10 recycling cycles, the photothermal catalytic degradation rates of the textile dyes were observed at 98.7%, 99.3%, 88.8%, 79.0%, 78.7% and 64.4%, respectively. The outstanding photothermal catalytic performances demonstrated that the Fe 3 O 4 @SiO 2 -laccase has a technical application in wastewater treatment .
研究领域:
环境科学
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生物技术
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DOI
高影响因子
Carbon Letters
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2024
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IF 5.5
Liu Rui,Zhang Xin,Han Xue,Sun Yuan,Jin Shuang,Liu Ri-jia
Fe 3 O 4 /g-C 3 N 4 /TiO 2 catalyst has been fabricated using a simple ultrasonic method with high photocatalytic activity. The morphology, structure and optical properties of Fe 3 O 4 /g-C 3 N 4 /TiO 2 were systematically investigated by a variety of characterization techniques. The optimum degradation conditions were investigated by degrading tetracycline (TC) under visible light irradiation. The results showed that the degradation efficiency was the highest when the initial TC concentration was 5.0 mg/L, the pH value was 11 and the catalyst dosage was 1.0 g/L. After 100 min of visible light irradiation, the degradation efficiency of TC achieved at 73.61%, which was 1.64 and 1.19 times that of g-C 3 N 4 and Fe 3 O 4 /g-C 3 N 4 , respectively. Moreover, Fe 3 O 4 /g-C 3 N 4 /TiO 2 had good stability and recyclability. The results of capture experiments showed that ‧O 2 − and ‧OH were the main active species during the photocatalytic process, and a possible photocatalytic reaction mechanism of Fe 3 O 4 /g-C 3 N 4 /TiO 2 catalyst was proposed. This study provides a new way to improve the photocatalytic performance of g-C 3 N 4 , which has great potential in degrading pollutants such as antibiotics in wastewater.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
DESALINATION
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2024
·
IF 8.3
You Zhou,Lei Xu,Sheng-Jie Han,Cai-Hua Liu,Yi-Bin Li,Ming-Lai Fu,Baoling Yuan
Solar-driven interfacial photothermal evaporation (SIPE) has been considered as a green and sustainable technology for obtaining fresh water, and the exploring efficient photothermal materials is crucial. Nanocomposite derived from metal-organic framework exhibits high light absorption properties and excellent chemical stability, making it an ideal candidate in the SIPE. Herein, Fe 3 O 4 /C nanocomposite was obtained using MIL-101 (Fe) as a precursor, and Fe 3 O 4 /C-based porous hydrogel (Fe 3 O 4 /C-PH) was subsequently prepared through chemical crosslinking foaming polymerization. The obtained Fe 3 O 4 /C-PH exhibited an evaporation rate of 3.33 kg m −2 h −1 under one sun intensity. Fe 3 O 4 /C-PH demonstrated outstanding desalination and salting out resistance when treating real seawater. Moreover, it could remove over 99 % of dyes from wastewater. The photothermal mechanisms are molecular thermal vibration of C component and semiconductor relaxation of Fe 3 O 4 . Meanwhile, the hydrophilic and porous skeleton structure of the hydrogel ensure Fe 3 O 4 /C-PH to transport water rapidly and exhibit good light absorption properties. This research broadens the candidate of photothermal materials for applications in SIPE, and also provides new avenues for desalination and wastewater purification.
研究领域:
材料科学
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环境科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
CURRENT MICROBIOLOGY
·
2025
·Vol. 82
·期 6
·1-10
·
IF 2.6
Zhang Pei,Yang Huanggen,Ahmad Malik Taj,Zheng Qi,Nie Guochao,Ahmad Ayesha,Raza Muslim,Raza Saleem
Biofilm formation presents significant challenges in healthcare, food processing, and water treatment, contributing to antibiotic resistance and persistent infections. Effective strategies to combat biofilm-associated infections are urgently needed. This study introduces a novel approach to biofilm removal by bio-functionalizing T4 bacteriophage with modified Fe 3 O 4 nanoparticles (NPs) and Nisin, an antibacterial peptide, to form the Fe 3 O 4 -Phage-T4 + Nisin complex. The aim is to enhance antimicrobial efficacy and biofilm eradication. The Fe 3 O 4 -Phage-T4 + Nisin complex was synthesized by conjugating T4 bacteriophage with modified Fe 3 O 4 NPs and Nisin. The antimicrobial and antibiofilm activity of the complex was evaluated against multidrug-resistant Pseudomonas aeruginosa strains ( PA01 and PA14 ) using biofilm inhibition and eradication assays. Stability and efficacy were further tested across a pH range of 5 to 8. The Fe₃O₄-Phage-T4 + Nisin complex exhibited superior biofilm removal compared to its individual components. The integration of Nisin broadened the antibacterial spectrum, targeting both Gram-positive and Gram-negative bacteria , while the modified Fe₃O₄ NPs enhanced phage penetration and bacterial cell disruption. The complex demonstrated significant biofilm inhibition and eradication, addressing the challenge of biofilm-related antibiotic tolerance, which often necessitates high antibiotic doses. Additionally, it maintained stability and efficacy across varying pH conditions.
研究领域:
微生物学
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生物技术
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医药科学
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产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Haotian Hao,Xu Huang,Yao Zhang,Shuo Xu,Yili Wang,Baoyou Shi
The efficient removal of phosphate from aqueous systems is critical for mitigating eutrophication and enhancing aquatic ecological sustainability. In this study, a regenerable magnetic composite material, designated as MLCit, was synthesized via an in-situ embedding method. This composite integrates a novel phosphate-binding lanthanum citrate complex (La-Cit) with Fe 3 O 4 nanoparticles to achieve efficient phosphate removal. Comparative analysis revealed that MLCit-1 (La/Fe molar ratio = 1:1) exhibits enhanced adsorption performance relative to four other magnetic lanthanum-based composites (La 3+ /Fe 3 O 4 , La 2 (CO 3 ) 3 /Fe 3 O 4 , La(OH) 3 /Fe 3 O 4 , and La 2 O 3 · x H 2 O/Fe 3 O 4 ). Specifically, MLCit-1 demonstrated a phosphate adsorption capacity 1.5–9 times higher than these counterparts, with an initial adsorption rate 1.46–2.22 times greater. The phosphate adsorption capacity increased significantly with more lanthanum proportion in MLCit. Structural characterization confirmed that MLCit-4 (La/Fe molar ratio = 4:1) adopts a core–shell structure, comprising Fe 3 O 4 nanoparticles encapsulated by amorphous La-Cit. The maximum adsorption capacity of MLCit-4 reached 77.85 mg P/g, with equilibrium achieved within 3 h at a dosage of 0.5 g/L. MLCit-4 exhibited broad pH applicability (4–11), exceptional anti-interference ability, and achieved residual phosphate concentrations below 0.05–0.1 mg P/L in four environmental water samples (TP < 5 mg P/L). The exhausted MLCit-4 could be easily regenerated by 3 h treatment of the 2.5 M NaOH and 1.875 M NaCl mixture. Remarkably, MLCit-4 retained its phosphate removal efficacy over 20 consecutive adsorption–desorption cycles, while simultaneously enabling the enrichment of phosphate in the desorbent. Mechanistic studies identified ligand exchange between P and citrate, forming inner-sphere complexes, with supplementary contributions from electrostatic interactions.
研究领域:
环境科学
·
水处理技术
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产品关联
DOI
高影响因子
DALTON TRANSACTIONS
·
2017
·Vol. 47
·期 5
·1666-1673
·
IF 4.029
Yan Lv,Lin Yue,Qian Li,Baoyi Shao,Sen Zhao,Haitao Wang,Shijia Wu,Zhouping Wang
Herein, the design and synthesis of a multifunctional (Fe3O4-NaYF4:Yb,Tm)@TiO2 photocatalyst through a facile sol–gel process combined with electrostatic self-assembly has been reported. Particularly, as an upconversion sensor, NaYF4:Yb,Tm nanoparticles have the ability to convert near-infrared (NIR) light into ultraviolet (UV) emissions, so that the catalytic body TiO2 can indirectly utilize the NIR part of sunlight but not UV light. The excellent photocatalytic activity of the hybrid samples is evaluated using a model of the degradation of methylene blue (MB). Most importantly, the obtained materials exhibit remarkable magnetic properties because of the addition of a magnetic component (Fe3O4), therefore, the photocatalysts possess desired recyclability and reusability, which is significant for actual applications. Finally, the possible photocatalysis mechanism of the nanohybrids is discussed and hydroxyl radicals (OH˙) are confirmed as the main reactive species.
研究领域:
材料科学
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环境科学
·
纳米技术
✓ 已验证
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）