ENVIRONMENTAL POLLUTION
·
2024
·
IF 7.6
Cheng Wang,Shuijing Zhou,Xiaoming Wang,Wenfeng Tan,Xionghan Feng
Photo-catalyzing sulfite (S(IV)) for the generation of sulfate radical (SO 4 •- ) has emerged as a novel advanced oxidation process (AOP) recently. However, both the potential of soil minerals as effective photocatalysts and the process of water acidification due to S(IV) oxidation have been overlooked. Herein, maghemite (γ-Fe 2 O 3 ), a typical soil iron oxide with excellent photocatalytic reactivity like hematite and magnetic-collectible property like magnetite, was successfully used to activate S(IV) for iohexol degradation under visible light irradiation. As a result, 91.3% of iohexol was eliminated within 15 min at 0.1 g/L maghemite and 0.5 mM S(IV) under neutral conditions. The influencing factors, including initial pH, catalyst dosage, S(IV) amount, co-existing substances and water matrix, were systematically investigated. The maghemite/S(IV)/vis system exhibited superior performance in iohexol degradation at a wide pH range (3–10). It was found that the released proton via S(IV) oxidation led to severe water acidification. Interestingly, a low dose of HCO 3 − could evidently resist water acidification with little influence on iohexol elimination. Radical quenching experiments and electron spin resonance (ESR) analysis confirmed that SO 4 •- , •OH and •O 2 − were involved in iohexol abatement with SO 4 •- being the dominant reactive species. Compared with hydrogen peroxide, persulfate and peroxymonosulfate, the established maghemite/S(IV)/vis system achieved much more remarkable degradation performance. Furthermore, the reactivity of the catalyst was not obviously reduced even after 10 runs of reaction. This study expands the application of soil iron oxide mineral in S(IV) activation in water treatment and proposes an approach to regulate water acidification in S(IV)-based AOP.
研究领域:
环境科学
·
化学工程
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DOI
PubMed
高影响因子
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
·
2026
·
IF 4.1
Yu Wang,Qiushuo Cheng,Ting Zhang,Lei Lü,Haixia Ma
The pyrolysis of energetic materials (EMs) directly determines their combustion performance and energy release efficiency. This study designed a potassium-doped maghemite (KF) catalyst with sea urchin-like structure. Traditional lead-based catalyst could cause serious environmental pollution, whereas KF may offer dual advantages of flame suppression and high catalytic activity. Electron paramagnetic resonance (EPR) spectroscopy demonstrate the increased defect concentration compared with commercial γ-Fe 2 O 3 and α-Fe 2 O 3 . The as-prepared KF catalyst provides more surface active sites, significantly enhancing its catalytic performance for the thermal decomposition of hexanitrohexaazaisowurtzitane (CL-20). Graphene oxide (GO) always acts as a stabilizer for EMs due to the excellent mechanical properties. Hence, K-γ-Fe 2 O 3 /reduced graphene oxide (KFG) was prepared via the one-step solvothermal method. Experimental results show that the ternary KFG composite can lower both the initial decomposition temperature and the apparent activation energy of CL-20. KFG accelerates the decomposition process of CL-20 and narrows the distribution of gaseous products. This study reveals the synergistic mechanism among potassium, γ-Fe 2 O 3 , and graphene, providing new design strategy and theoretical foundation for highly efficient combustion catalysts applied in solid propellants.
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高影响因子
Environmental Science-Nano
·
2026
·
IF 5.1
Hui Dong,Bo Su,YanXi Cheng,Saikat Ghosh,Nihar Ranjan Pradhan,Bo Pan,Baoshan Xing
The co-assembly of humic acid (HA)-coated maghemite nanoparticles (H-GFeNPs) and bovine serum albumin (BSA)-modified maghemite nanoparticles (B-GFeNPs) and sequestration of NO₃⁻ within the colloidal crystals were investigated. The π-π interaction between aromatic moieties of the adsorbed BSA and HA controlled the co-assembly process. The 1:1 binary mixture of H-GFeNPs and B-GFeNPs at pH 4 showed screw dislocation-driven growth of colloidal crystals, especially at higher concentrations of NO₃⁻. But, at pH 7, the binary mixture in the presence of NO₃⁻ produced spherical dendritic nanostructures and hierarchical growth of dendrites. However, at higher levels of NO3-, the binary mixture produced 2D cubic lattice and rocksalt-like 3D colloidal crystals. In addition, we also detected the growth of dendrites, ubiquitous in rocksalt-type crystal growth, specifically in an unsaturated environment. The binding of NO₃⁻ to the hydrophobic and positively charged residues of the protein, supplemented by the loss of α-helix and reduced radius of gyration (Rg), possibly favored crystal growth. Signatures of the NO3- specific Raman bands within the colloidal crystals discerned the sequestration of the highly mobile contaminant ion within the crystalline domain. Therefore, potentially diminishes the atmospheric emission of high global warming potential (GWP) oxides of N produced via denitrification.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Xinghao Liu,Haipu Li,Ying Fang,Zhaoguang Yang
Sulfamethazine (SMT), widely used for treating diseases by bacterial infections, is difficult to degrade with the traditional water treatment process completely. Catalytic ozonation with synthesized maghemite-supported manganese oxides (Mn x O y /γ-Fe 2 O 3 ) as the catalyst could degrade 100% SMT in 30 min and remove 61.9% TOC in 90 min. Moreover, the TOC removal ratio was 1.79 times higher than that with ozonation alone. The SMT mineralization increased with increasing the ozone dosage, catalyst dosage, and pH of the solution, but it decreased with increasing the SMT concentration. Furthermore, the generated hydroxyl radical contributed to SMT mineralization. The OH on the surface of Mn x O y /γ-Fe 2 O 3 could further react with O 3 to trigger a series of reactions and generate the reactive species. The polyvalent manganese provided the electrons for O 3 to produce the reactive species. The degradation process of SMT mainly consisted of de-sulfuration and hydroxylation. The toxicity of final intermediates was negligible compared with that of SMT. The anions or the humic acid in the solution could affect SMT mineralization. The excellent catalytic activity, reusability, and stability of Mn x O y /γ-Fe 2 O 3 catalysts lay a good foundation for practical application in the future.
研究领域:
环境科学
·
水处理
·
催化
·
化学工程
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DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2023
·
IF 9.8
Huiping Zeng,Weihua Zhao,Siqi Sun,Xiao Sun,Yuwei Zeng,Ruixia Hao,Jie Zhang,Dong Li
In this study, we demonstrated the effective acquisition of magnetic iron oxide (MIO) for As(V) adsorption by high-temperature pyrolysis of waste iron sludge from the water treatment plant under a confined environment without adding extra chemical reagents. The operating temperature and time in the pyrolysis process were optimized to improve the yield of MIO and its As(V) adsorption capacity. MIO 500 – 2 (500 °C, 2 h) had both relatively high yield and arsenic adsorption efficiency, which was characterized by XRD and XPS as mainly γ-Fe 2 O 3 with small particle size (100–900 nm), significant mesopore (12.43 nm), high specific surface area (65.25 m 2 /g), and effective saturation magnetization intensity (14.45 emu/g). The maximum adsorption capacity was 14.2 ± 0.4 mg/g, and the removal rate could still reach about 80 % after five times of adsorbent regeneration. Considering this facile preparation route and its high yield, large-scale production of MIO from waste iron sludge is feasible, which is expected to provide a low-cost and efficient adsorbent for the treatment of arsenic-containing water in less economically developed areas.
研究领域:
环境科学
·
材料科学
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DOI
PubMed
高影响因子
TRANSACTIONS OF THE INSTITUTE OF MEASUREMENT AND CONTROL
·
2023
·
IF 1.8
Patigu Maimaiti,Patima Nizamidin,Nuerguli Kari,Buayishamu Kutilike,Abliz Yimit
This study concerns the development of a maghemite (γ-Fe2O3)-coupled tetra sulfophenyl porphyrin (TSPP) thin film–based optical waveguide (OWG) sensor (TSPP-γ-Fe2O3-OWG) for the detection of ethylenediamine (EDA). For ease of manufacture, we fabricated sensors using a spin-coating technique, and characterized their response based on their ultraviolet-visible (UV-vis) absorption spectra and the response intensity of OWG sensor. We have observed significant changes in the location of the peaks in the sensor’s UV-vis absorption spectra after exposed to EDA gas, indicating aggregation of TSPP. Optical characterization confirmed that the combination of TSPP with maghemite (TSPP-γ-Fe2O3-OWG) had improved device response, with twice as high as those of the acid-treated TSPP-OWG sensor, and 30 times higher than that of the pure γ-Fe2O3-OWG sensor. At ambient temperature, the composite sensor exhibited a linear response to EDA gas in the concentration range of 0.1–1000 ppm with signal-to-noise ratio (S/N) 8.33, confirming that the improved stability of the composite TSPP-γ-Fe2O3 thin-film OWG enables the detection of trace amounts of gas with high sensitivity and selectivity.
研究领域:
材料科学
·
化学传感器
·
光学器件
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DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2012
·
IF 2.103
L.D. Zhang,W.L. Liu,W.H. Xu,J.S. Yao,L. Zhao,X.Q. Wang,Y.Z. Wu
We combine two abilities: the superhydrophobicity of lotus leaf and the magnetic property of γ-Fe 2 O 3 . A superhydrophobic and superparamagnetic polystyrene/silica/maghemite (PS/SiO 2 /γ-Fe 2 O 3 (PSVSF)) film was prepared by a three-step chemical procedure at mild conditions. The products exhibited superhydrophobicity and superparamagnetism after coating and modifying. Because PS and SiO 2 supplied the low surface energy and roughness, respectively. In addition, the classic and a modified Cassie–Baxter relation were applied on the PSVSF films to verify the superhydrophobic performance. It indicates that the obtained superhydrophobic and superparamagnetic films are promising materials for numerous potential applications fields, including aerospace, electronic, biomedical, martial and defense-related areas.
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DOI
高影响因子
Journal of Materials Chemistry A
·
2018
·Vol. 6
·期 8
·3571-3582
·
IF 9.931
Juan Yao,Junying Chen,Kui Shen,Yingwei Li
Solar water splitting to produce H2 represents a solution with high potential for the current severe energy and environmental issues. Iron oxides are earth-abundant and nontoxic, with narrow bandgaps and suitable valence band positions for the visible-light-driven water oxidation reaction; however, an energy limitation for hydrogen generation is encountered due to the improper conduction band level. Herein, we demonstrated that this limitation could be overcome by the incorporation of small amounts of GO in the metal–organic framework (MOF)-templated synthesis of iron oxide, affording a uniform and highly ordered ferrite octahedral nanostructure embedded on graphene nanosheets. Such structural superiorities would result in a highly synergistic effect between Fe2O3 and reduced graphene oxide (rGO), affording an elevated flat band potential and a promoted photogenerated charge carrier separation and transportation. As a consequence, the resulting maghemite–carbonaceous composite exhibited a high photocatalytic H2 evolution rate of 318.0 μmol h−1 g−1 in the absence of noble metal cocatalysts and external bias. This work provides for the first time an ideal pathway for the utilization of Fe2O3 as the dominant component of a nanocomposite in efficient photocatalytic H2 production, as well as the prospect of developing highly active photocatalysts for overall water splitting. In addition, different phases of iron oxide, including maghemite (γ-Fe2O3), hematite (α-Fe2O3) and magnetite (Fe3O4), and their carbonaceous composites can be obtained through the cautiously selected thermolysis of Fe-MOF and MOF/GO composites. The maghemite phase could be maintained with high saturation magnetization values under a large temperature gradient, implying a great potential for applications in magnetism and biomedicine-related research fields.
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DOI
高影响因子
JOURNAL OF NANOPARTICLE RESEARCH
·
2019
·Vol. 21
·期 10
·1-13
·
IF 2.009
Wang Xueqin,Ouyang Fan,Cui Liuqing,Xiong Tiandi,Guan Xinglei,Guo Yuqi,Duan Shaofeng
Maghemite (γ-Fe 2 O 3 ) nanoparticles (NPs) emerging as an artificial enzymes have demonstrated an excellent peroxidase-like activity and thus gained much attention in various biological and medical applications. But naked γ-Fe 2 O 3 NPs are aqueously instable and prone to aggregation in biological solutions such as blood plasma. Surface coating for γ-Fe 2 O 3 NPs is thus necessitated to achieve better stability and biocompatibility. In this work, three typical coating layers including poly(lactic-co-glycolic acid) (PLGA), carboxymethyl chitosan (CMCS), and human serum albumin (HSA) were utilized as modifiers to decorate γ-Fe 2 O 3 NPs and fabricate compound NPs including NP PLGA , NP CMCS , and NP HSA , respectively, and subsequently, the peroxidase-like activity of these NPs was evaluated with colorimetric analysis of cholesterol detection. The results showed that the surface coating barely affected peroxidase-like activity of NPs but could remarkably amend stability in the determined pH and temperature ranges. As evidenced with kinetic parameters, the enzymatic catalysis of NPs accorded well with Michaelis–Menten kinetics. Moreover, the catalytic assay demonstrated that the fabricated NP PLGA , NP CMCS , and NP HSA showed a capable catalytic activity using cholesterol as substrate, and especially, the NP PLGA showed a higher peroxidase-like activity compared with the NP CMCS and NP HSA . In conclusion, herein we obtained a coating layer-modulated peroxidase-like activity of γ-Fe 2 O 3 NPs for a visualized analysis of cholesterol, which could be extended for cholesterol detection in biomedical analyses in the future.
研究领域:
生物医学工程
·
纳米医学
·
分析化学
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高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2016
·Vol. 24
·期 2
·1926-1937
·
IF 2.76
Jin Mingjie,Long Mingce,Su Hanrui,Pan Yue,Zhang Qiuzhuo,Wang Juan,Zhou Baoxue,Zhang Yanwu
To develop highly efficient and conveniently separable iron containing catalysts is crucial to remove recalcitrant organic pollutants in wastewater through a heterogeneous Fenton-like reaction. A maghemite/montmorillonite composite was synthesized by a coprecipitation and calcination method. The physiochemical properties of catalysts were characterized by XRD, TEM, nitrogen physisorption, thermogravimetric analysis/differential scanning calorimetry (TG/DSC), zeta potential, and magnetite susceptibility measurements. The influence of calcination temperatures and reaction parameters was investigated. The calcined composites retain magnetism because the presence of montmorillonite inhibited the growth of γ-Fe 2 O 3 nanoparticles, as well as their phase transition. The catalytic activities for phenol degradation were significantly enhanced by calcinations, which strengthen the interaction between iron oxides and aluminosilicate framework and result in more negatively charged surface. The composite (73 m 2 /g) calcined at 350 °C had the highest catalytic activities, with more than 99 % phenol reduction after only 35 min reaction at pH 3.6. Simultaneously, this catalyst exhibited high stability, low iron leaching, and magnetically separable ability for consecutive usage, making it promising for the removal of recalcitrant organic pollutants in wastewater.
研究领域:
环境科学
·
材料科学
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DOI
PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2026
·
IF 10.6
Zhixin Xia,Jiajun He,U.T. Uthappa,Ming Zhang,Lipeng Liao,Zhuwen Liu,Xu Li,Qian Cheng,Zhiguang Guo,Ben Wang
Emerging contaminants (ECs), including antibiotics and micro/nanoplastics, pose increasing risks to aquatic ecosystems due to their persistence, toxicity, and bioaccumulation. Herein, we report a cost-effective, magnetically responsive MAG-SEP-XER sorbent constructed from natural sepiolite fibers, maghemite (γ-Fe₂O₃), and silica xerogel. When compared with conventional passive adsorbents, MAG-SEP-XER integrates broad-spectrum adsorption, magnetic recovery, and micro-motor-assisted dynamic decontamination, enabling efficient removal of tetracycline (TETRA), ciprofloxacin (CIPRO), microplastics, and nanoplastics with efficiencies up to 99%. In batch tests, 20 mg of MAG-SEP-XER removed 75–96.5% of TETRA and 79–82% of CIPRO within 120 min at 5 ppm, while higher dosages enabled near-complete removal of 98–99%. The maximum adsorption capacities reached 4.4, 4.12, 180, and 80 mg/g for TETRA, CIPRO, microplastics, and nanoplastics, respectively. Further, MAG-SEP-XER also achieved 70–99% removal in real water samples and retained appreciable performance after five adsorption–desorption cycles. Moreover, as a magnetically actuated hybrid wireless micro-motor, MAG-SEP-XER enabled dynamic MB decontamination with 80–90% removal efficiency. This work demonstrates a scalable, efficient approach for mitigating multiple ECs, highlighting its potential for real-world water treatment applications.
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高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2017
·
IF 4.9
Suding Yan,Weihui Xiong,Shuya Xing,Yueqi Shao,Rui Guo,Hui Zhang
Electro-assisted iron-mediated persulfate (PS) activation process has been successfully employed to oxidize organic contaminant . However, a majority of iron-based catalysts used for PS activation was synthesized through complicated or demanding procedures and may have potential risks on environment during the preparation process. Herein, natural maghemite (NM) which is abundant on the earth was employed to activate peroxydisulfate (PDS) in an electrolytic cell . The voltage was provided by microbial fuel cell (MFC) instead of external power as reported in the previous studies, so as to establish a self-driven electro/natural maghemite/PDS system (MFC/NM/PDS) for the oxidation of acid orange 7 (AO7). The results showed that above 90% removal efficiency of AO7 was achieved in a wide range of pH (3.0–9.0) after 100 min reaction. Singlet oxygen was identified for the first time during PDS activation and surface bound sulfate radicals served as the dominant active species responsible for AO7 oxidation. The underlying mechanism of AO7 elimination in the MFC/NM/PDS system was elucidated through quenching tests, electron paramagnetic resonance (EPR) and X-ray photoelectron spectroscopy (XPS) techniques. The variation of TOC and cytotoxicity to Escherichia coli was explored. The intermediate products formed were identified using LC-TOF-MS technique and a possible pathway of AO7 degradation was proposed.
研究领域:
环境科学
·
化学工程
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PubMed
高影响因子
危险品化学品经营许可证（带存储）