JOURNAL OF MOLECULAR LIQUIDS
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2021
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IF 6.165
Adeel Ahmed,Muhammad Usman,Bing Yu,Youqing Shen,Hailin Cong
Seeking an effective strategy to develop inexpensive and highly stable photocatalyst materials for dye degradation is of great significance to resolve the global environmental problems caused by dye abuse. Herein, we have reported the environmental-friendly synthesis of exceptionally efficient and highly sustainable hematite nanoparticles (α-Fe 2 O 3 NPs) using Punica granatum seed extract biomolecules. The morphology and phase purity of the synthesized α-Fe 2 O 3 NPs were executed through a series of characterization techniques. FESEM and TEM analysis exhibited that the synthesized α-Fe 2 O 3 NPs were irregular-shaped with an average size of 26.53 nm, while the BET surface area of nanoparticles was estimated to be 31.52 m 2 /g with an average pore diameter of 5.54 nm. α-Fe 2 O 3 NPs exhibited typical ferromagnetic behavior at room temperature. The oxidation states of elements in α-Fe 2 O 3 NPs were confirmed through X-ray photoelectron spectroscopy (XPS) analysis, while the charge on α-Fe 2 O 3 NPs was found to be −10.6 mV. The as-prepared α-Fe 2 O 3 NPs were utilized in solar-light driven photocatalytic degradation of anionic Congo red (CR) and Bromophenol blue (BPB) dye. Experimental results indicated the remarkable photocatalytic activity of α-Fe 2 O 3 NPs, and approximately 89.42% of CR and 87.96% of BPB was degraded in 240 min under sunlight irradiation at ambient conditions. The photocatalytic degradation experiments were also performed under different reaction conditions which followed the pseudo-first-order kinetics. The presence of reactive species generated in the reaction system liable for the CR and BPB degradation were corroborated through radical quenching experiments and further confirmed by EPR analysis. The excellent photocatalytic potential of α-Fe 2 O 3 NPs suggested that the synthesized nanoparticles could effectually be applied to remove organic dyes from the wastewater.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2019
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IF 6.361
Lifang Pan,Shihai Cao,Rui Liu,Huan Chen,Fang Jiang,Xin Wang
Aldehyde-functionalized α-Fe 2 O 3 /graphitic carbon nitride (α-Fe 2 O 3 -DBD/g-C 3 N 4 ) was successfully synthesized through Schiff-based reaction between aromatic aldehydes in 3,4-dihydroxybenzaldehyde and NH 2 groups in urea. The 3,4-dihydroxybenzaldehyde around α-Fe 2 O 3 were advantageous to in situ growth of graphitic carbon nitride on α-Fe 2 O 3 to form the contact interface by chemical bonds and beneficial to the electron transfer , leading to the formation of Z-scheme photocatalytic system. The α-Fe 2 O 3 -DBD/g-C 3 N 4 photocatalysts exhibited a remarkable improvement in the degradation of bisphenol A (BPA) compared with bulk g-C 3 N 4 . The enhanced photocatalytic activity was attributed to the enhanced charge separation efficiency and higher redox potential . This study presents a simple and efficient method to construct all-solid-state Z-scheme photocatalytic system with the formation of tight contact interface and nonmetal materials (aromatic rings) as electron mediators for the removal of complex pollutants.
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ENVIRONMENTAL RESEARCH
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2025
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IF 7.7
Mengru Shi,Weijiang Tang,Sheng Guo,Fengxi Chen
Emerging antibiotic pollutants pose long-term risks to ecosystems and human health, necessitating the development of advanced elimination technologies. In this study, hierarchically porous α-Fe 2 O 3 nanosheets (α-Fe 2 O 3 -PNS) were prepared from an iron-polyvinylpyrrolidone (Fe-PVP) hybrid gel, where PVP served multiple functions, including iron immobilization, morphology template, pore formation, and crystallite growth regulation. As an efficient heterogeneous Fenton-like catalyst, α-Fe 2 O 3 -PNS achieved 93.6 % degradation of tetracycline (TC, 25 mg/L) within 2 h under mild conditions (25 °C, pH 5) using only 4 mM H 2 O 2 . The reaction followed pseudo-first-order kinetics with a high rate constant (0.0606 min −1 ) and an outstanding normalization factor (8.13). Key operational parameters (i.e., PVP dosage, catalyst loading, H 2 O 2 concentration, initial pH, coexisting anions and natural organic matter) were investigated. The material exhibited good reusability over five consecutive cycles and maintained robust performance in real water matrices. Its superior catalytic activity originated from exposed (113) crystal planes, abundant accessible iron sites, and rapid Fe 3+ /Fe 2+ redox cycling facilitated by the large surface area. Radical quenching tests and electron paramagnetic resonance spectroscopy confirmed that hydroxyl radicals, generated via surface Fe 2+ -mediated H 2 O 2 activation, are dominant reactive species, driving TC degradation through hydroxylation, oxidative cleavage, and ring-opening reactions. This study provides an energy- and resource-efficient solution for sustainable water remediation, operating effectively under ambient and circumneutral conditions with low H 2 O 2 consumption.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2025
·Vol. 36
·期 27
·1-13
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IF 2.8
Anjum Muhammad Naveed,Qayyum Muhammad Abdul,Zulfiqar Zunaira,Ahmad Mirza Nadeem,Saif Muhammad Jawwad,Bahadur Ali,Iqbal Shahid,Mahmood Sajid,Alotaibi Khalid M.,Farouk Abd-ElAziem
Based on an appropriate procedure and little toxicity to living things, photocatalytic degradation is noted as one of the best ways to address environmental problems, especially for the effective breakdown of organic pollutants. The present work was aimed at investigating the photocatalytic performance of oxides as ternary nanocomposites in the degradation of Direct Red 28 dye in aqueous solution under solar light. The solvothermal process was employed for the synthesis of Gray-TiO 2 /ZnO/α-Fe 2 O 3 composites. The constructed composite was characterized by means of FTIR, PL, XRD, and SEM, among other methods. The photocatalytic activity of the composite enhances up to 98.82% at pH 3, while it reduces up to 72.21% with an increasing concentration of initial dye at 30 mgL −1 . The synthesized composite had a degradation efficiency of around 99% for Direct Red 28 dye since its recombination rate was high. After the four cyclic runs of the used composite, 85% degradation of Direct Red 28 was observed, which substantiates that the Gray-TiO 2 /ZnO/α-Fe 2 O 3 composite is a stable and efficient catalyst.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2021
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IF 5.316
Shuai Wang,Changhao Yao,Yifeng Cai,Yang Yang,Huiyuan Ma,Baojiang Jiang,Jun Ma
In this study, α-Fe 2 O 3 /rGO was smoothly synthesized by a one-step method and employed to activate persulfate (PS) for the degradation of Bisphenol A (BPA) under sunlight. During the degradation experiment, the degradation rates of BPA for PS, α-Fe 2 O 3 /8% rGO, and α-Fe 2 O 3 /8% rGO/PS were 6.6%, 47.6%, and 99.1%, respectively, indicating that the introduction of α-Fe 2 O 3 /rGO and PS significantly enhanced the photocatalytic efficiency because that photocatalytic process and PS activation coupling system not only inhibited the recombination of photo-induced carrier pairs, but also reduced the energy consumption of PS activation. Moreover, electron spin resonance spectroscopy (ESR) and trapping experiments were utilized to explore the active species generated during the reaction. The results showed that •OH and •SO 4 2- were the principal oxidative species in this reaction system. These results showed that Fe-loaded rGO has great potential for activating PS to decompose pollutants in water.
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ADVANCED FUNCTIONAL MATERIALS
·
2024
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IF 18.5
Yu Bing,Zhao Song,Hongtao Jiang,Xiaoyi Xu,Zhongzheng Yu,Tingting Zhou,Tong Zhang
Water competitive adsorption and limited reaction sites on the micro-scale sensing area of micro-electro-mechanical system (MEMS) sensors are two bottleneck problems that restrict the detection of trace indoor polluted gases, leading to drifting and weak signals. To address this, a “duet-insurance” sensing strategy is proposed to protect and amplify the sensing signal. For the first-level protection, the well-designed double-layer structure consisting of Janus TpMa covalent organic framework (COF)/Eu-doped α-Fe 2 O 3 can resist diffusion of water molecules and facilitate the electron transfer from formaldehyde (CH 2 O) to sensing layers, benefiting from the outer hydrophobic character of Janus TpMa and the strong CH 2 O adsorption capacity of Eu-doped Fe 2 O 3 . For the second-level amplification, the unique variable temperature excitation facilitates the deep penetration of CH 2 O into the active sites across COF layers, enabling signal amplification through thermally actuated carrier modulation. The sensor demonstrates high sensing ability to the CH 2 O, with an ultra-low limit of detection of 794 ppt. Leveraging the novel sensing strategy, a multi-functional, visual sensing system is designed to identify multi-indoor pollution gases by feature signal encoding and color mapping, showcasing the promising potential for MEMS sensors based on Janus TpMa COF/Eu-doped α-Fe 2 O 3 materials.
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BIOELECTROCHEMISTRY
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2024
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IF 4.8
Zhihao Xu,Zhixiang Lv,Huijiao Yang,Jiashuo Zhang,Zijie Sun,Dawei He,Ruijiang Liu
A label-free electrochemical DNA detection strategy based on self-assembled α-Fe 2 O 3 /Fe 3 O 4 nanosheets with PNA-DNA hybridization process was developed for ultrasensitive detection of APOE ε4 gene, one of the most robust genetic risks for Alzheimer’s Disease (AD). In this work, magnetic α-Fe 2 O 3 /Fe 3 O 4 heterogeneous nanosheets were prepared by hydrothermal-calcined reduction method and loaded with Au nanoparticles (AuNPs) on their surfaces. The magnetic α-Fe 2 O 3 /Fe 3 O 4 @Au nanocomposites significantly enhanced the electrochemical response as a signal amplification matrix and were able to bind to the magnetic glassy carbon electrode (MGCE) surface by magnetic self-assembly. Moreover, owing to the high specificity and stable binding capacity of PNA with respect to the target DNA, the biosensor not only enabled accurate (the limit of detection was estimated to be 0.147 pM) and rapid detection of the APOE ε4 gene, but also exhibited excellent specificity, stability and regeneration capability. Additional, the satisfactory recoveries were also obtained in real samples of human serum, ranging from 92.83 % to 106.22 % with relative standard deviation (RSD) between 0.25 % and 1.85 %. The results possessed important reference value for exploring the application of DNA biosensor technology in the diagnosis of APOE gene mutation.
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Journal of Materials Chemistry A
·
2025
·
IF 9.5
Weiguang Hu,Qinghua Xia,Lian Ying Zhang,Jianguo Lu,Qinggang He,Weiyong Yuan
Amorphous MOFs (a-MOFs) could be highly promising cocatalysts of 3-D α-Fe2O3 to greatly improve its photoelectrochemical oxygen evolution performance, but their effective synthesis and assembly on 3-D α-Fe2O3 presents formidable challenges. A conformal and ultrathin layer of amorphous Co–TDPAT (a-Co–TDPAT) MOF cocatalyst has been in situ self-assembled on an α-Fe2O3 nanosheet array (NSA) by employing 5,5′,5″-(1,3,5-triazine-2,4,6-triyl)tris(azanediyl)triisophthalic acid (H6TDPAT) as the organic ligand. The obtained α-Fe2O3 NSA@a-Co–TDPAT core–shell NSA exhibits a photocurrent density of 1.54 mA cm−2 (1.23 V), onset potential of ∼0.48 V, and photoconversion efficiency of 0.25%, 6.2 times higher, 290 mV lower, and 12.5 times higher, respectively, than those of the α-Fe2O3 NSA. The photocurrent density and the photoconversion efficiency are among the highest reported for photoanodes based on the FTO-supported α-Fe2O3 NSA without addition of noble metals, and the onset potential is the lowest among those of FTO-supported α-Fe2O3-based photoanodes reported. It is discovered that a-Co–TDPAT significantly enhances charge separation and accelerates charge transport and transfer for a fast oxygen evolution reaction, thus greatly boosting PEC oxygen evolution. This work not only provides a novel strategy to produce highly efficient, highly stable, low-cost, and earth-abundant core–shell water splitting photoanodes via in situ self-assembly of conformal, ultrathin a-MOFs on an α-Fe2O3 NSA, but sheds light on the mechanisms for controlled self-assembly of MOFs and PEC performance enhancement of α-Fe2O3-based photoelectrodes.
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ADVANCED POWDER TECHNOLOGY
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2012
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IF 1.612
Hongtao Cui,Yan Liu,Wanzhong Ren
With same procedure and same starting materials, nearly monodispersed α-Fe 2 O 3 , γ-Fe 2 O 3 and Fe 3 O 4 nanoparticles were synthesized on an large scale of about 60 g in a single reaction through a low temperature sol–gel route. The simple preparation process includes the reactions between FeCl 2 and propylene oxide in ethanol solution at boiling point to form a sol and the following drying of the sol. The different iron oxide phases can be obtained just by changing of the drying conditions for the sol solution. The strategy developed in this study offers important advantages over the conventional routes for the synthesis of α-Fe 2 O 3 , γ-Fe 2 O 3 and Fe 3 O 4 nanoparticles , showing potential for its application in industrial production of iron oxides.
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JOURNAL OF POWER SOURCES
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2020
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IF 8.247
Jing Li,Feng Li,Jun Jin
Hematite can be used as an efficient photoanode for solar water oxidation , but its oxygen evolution kinetics are quite slow. Herein, we developed an efficient hole transport photoanode via the in situ growth of ultrathin Fe-doped NiOOH on fluorine-doped hematite arrays using a natural growth strategy. The resulting FeNiOOH/F–Fe 2 O 3 photoanode showed a high charge separation and injection efficiency. It achieved a stable photocurrent density of 2.52 mA cm −2 at 1.23 V vs. RHE, which was approximately 4.1-fold higher than that of pristine α-Fe 2 O 3 . Systematic studies revealed that the excellent photoelectrochemical activity was due to heteroatom doping and interactions between the co-catalyst (FeNiOOH) and F–Fe 2 O 3 . Fe doping primarily changed the lattice strain of the co-catalyst, while F doping decreased surface charge recombination and enhanced the intrinsic conductivity of hematite by increasing the carrier density. An ultrathin, amorphous layer of FeNiOOH further accelerated photogenerated hole extraction and the water oxidation kinetics. This work provides a method to produce new, cost-effective photoanodes for clean hydrogen production .
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Arabian Journal of Chemistry
·
2023
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IF 6
Mingyi Ma,Zhixiang Lv,You Li,Ziye Zhu,Chen Ling,Dawei He,Ruijiang Liu
Problem Unhealthy dietary habits and inadequate existing treatment technologies have led to high morbidity and mortality rates in patients with gastric cancer, and the research shows that curcumin has excellent antitumor properties, however, the non-water-soluble characteristic of curcumin limits its applications. To break the limitation, the targeted drug carriers become the urgent need to treat gastric cancer. Method The heterogeneous magnetic α-Fe 2 O 3 /Fe 3 O 4 nanoparticles were obtained by rapid combustion method with citric acid (CA) and ferric nitrate as raw materials and anhydrous ethanol as solvent and fuel, and then modified with citric acid (CA) and chitosan (CTS), and loaded curcumin (Cur) to form α-Fe 2 O 3 /Fe 3 O 4 -CA-CTS-Cur nanosystem. Results The particle sizes of heterogeneous magnetic α-Fe 2 O 3 /Fe 3 O 4 nanoparticles and α-Fe 2 O 3 /Fe 3 O 4 -CA-CTS-Cur nanosystem were 24.9 nm and 35.6 nm, respectively, and their respective saturation magnetization were 70.9 emu/g and 30.3 emu/g. The magnetic α-Fe 2 O 3 /Fe 3 O 4 -CA-CTS-Cur nanosystem had good stability, excellent drug release rate, and enhanced apoptosis to gastric cancer cells (SGC-7901) through the caspase pathway and ferroptosis of cells. Conclusions The magnetic drug delivery nanosystem was successfully constructed, and revealed significant inhibitory and killing effects on SGC-7901 cells, and low toxic and side effects on normal cells.
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BIOSENSORS & BIOELECTRONICS
·
2015
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IF 6.409
Biyan Xu,Delun Zheng,Weiwei Qiu,Feng Gao,Shaoxiong Jiang,Qingxiang Wang
In this work, a novel electrochemical DNA biosensor has been developed based on the hybrid film of fern leaf-like α-Fe 2 O 3 microparticles and chitosan (CS). The fern leaf-like α-Fe 2 O 3 microparticles were synthesized via a facile template-free hydrothermal method, and their morphologies were characterized by X-ray diffraction, energy dispersive spectrometry, scanning electron microscope, and transmission electron microscope. Electrochemical characterization assays revealed that the hybrid film modified electrode had remarkable synergistic effects of the large accessible surface area and high electrical conductivity of semiconductive Fe 2 O 3 , and the good film stability of CS. Based on the rich amino groups on CS, the CS–Fe 2 O 3 hybrid film was employed as a functional matrix for probe DNA immobilization using terephthalaldehyde (TPA) as a bifunctional arm-linker. The hybridization capacity of the developed biosensor was evaluated with electrochemical impedance spectroscopy (EIS) using [Fe(CN) 6 ] 3−/4− as the indicating probe. A wide dynamic detection range from 1.0×10 −14 to 1.0×10 −10 M with ultralow detection limit of 5.6×10 −15 M was achieved for the target DNA. The hybridization selectivity experiments further revealed that the biosensor could discriminate fully complementary sequences from one-base mismatched, three-base mismatched, and non-complementary sequences. Moreover, the biosensor showed the advantage of good regeneration ability and reproducibility.
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