RSC Advances
·
2015
·Vol. 5
·期 84
·68815-68821
·
IF 3.84
Qiang Li,Yue Zhang,Yang Jin,Qingbiao Yang,Jianshi Du,Yaoxian Li
A novel multifunctional fluorescent chemosensor has been constructed with a highly selective “off–on” behavior, recoverability and recyclability based on β-CD/AD (adamantane) host–guest self-assembly interactions. Adamantane-modified fluorescein/cyclodextrin-modified Fe3O4@SiO2 inclusion complex magnetic nanoparticles (FFIC MNPs), which can provide a specific green fluorescence enhancement in response to Zn2+, have a detection limit of 4.5 × 10−7 mol L−1 in CH3CN : H2O (1 : 4, v/v). The spirolactam ring in the fluorophore moiety would be open with the introduction of Zn2+, while it could recover as long as the zinc in the complex is removed. Meanwhile, one gram of FFIC MNPs can adsorb 6.1 mg zinc. Therefore, the derivative chemosensors, FFIC MNPs–Zn, are available to respond to CN− due to the fluorescence quenching under UV (ultraviolet) radiation with a detection limit of 7.7 × 10−7 mol L−1. Furthermore, the FFIC MNPs exhibit great reusability and recyclability in aqueous solution on account of their magnetism and reproducibility. We recycle the residual MNPs to detect Zn2+ repeatedly for at least 4 times, after readily adsorbing the complex zinc with excess CN−, and the same principle also works in reverse. If the fluorophore moiety is inactive, we could also wash out the useless fluorescent molecules from the MNPs (hosts) and then reassemble new fluorescent small-molecules (guests) to maintain the efficient properties of the probe in responding to Zn2+ and CN− for at least 7 times.
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高影响因子
Biochar
·
2023
·Vol. 5
·期 1
·1-20
·
IF 12.7
Yang Bowen,Dai Jiawei,Zhao Yuan,Wang Zhanchao,Wu Jingwei,Ji Caiya,Zhang Yuhu,Pu Xiao
Biochar-coupled Fe 3 O 4 @SiO 2 /TiO 2 /g-C 3 N 4 composites were successfully constructed through simple sol–gel and calcination methods. The composites efficiently removed high-concentration toxic tetracycline (TC) by means of ·OH and · \({\rm O}_2^{-}\) , whose removal rate exhibited 91.88% during 3 h, and the degradation rate constant reached up to 0.0068 min −1 . The excellent performance can be attributed to the high specific surface area, enhanced visible light response, the introduction of magnetic nanoparticles and biochars expediting charge transfer, Z-scheme heterojunction enhancing the spatial separation of photo-generate carriers and, importantly extraordinary adsorption capacity of 147.96 mg g −1 . Moreover, the composites showed the most excellent efficiency under the calcination temperature of 450 ℃, and exhibited good stability with tolerance to a wide range of pH and anions. Interestingly, a synergistic photocatalytic effect was discovered in the TC/Cr(VI) combined pollution systems, resulting in significantly improved removal of Cr(VI). Besides, the photocatalytic mechanism and degradation path of tetracycline were also elucidated. All these findings suggested the as-synthesized catalyst was an excellent photocatalyst for removal of TC/Cr(VI)-contaminated water. Graphical Abstract
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高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2023
·
IF 7.2
Tiantian Feng,Zhijie Cui,Pengfei Guo,Xuehong Wang,Juan Li,Xien Liu,Wenpin Wang,Zhongcheng Li
Tailoring surface composition and structures of catalysts affects their catalytic performance in hydrogen evolution reaction owing to the geometric and electronic effects. Herein, Ru nanoparticles embedded in 2D N-doped carbon nanosheets decorated with 2D Fe 3 O 4 –Fe 3 C heterostructures (Ru/Fe 3 O 4 –Fe 3 C/NC) are fabricated via pyrolysis of the mixture containing 2D-Fe 2 O 3 nanosheets, dopamine hydrochloride , RuCl 3 ·xH 2 O, and melamine . Interestingly, the good hydrogen evolution behavior is achieved on Ru/Fe 3 O 4 –Fe 3 C/NC with the high reactivity and stability. Ru/Fe 3 O 4 –Fe 3 C/NC offers an overpotential of 141 mV to realize the current density of 10 mA/cm 2 in 0.5 mol/L (M) H 2 SO 4 electrolyte. As for 1 M KOH, Ru/Fe 3 O 4 –Fe 3 C/NC promotes hydrogen evolution reactivity with 148 mV to achieve 10 mA/cm 2 . The current density slightly degrades after continuous I-t tests, verifying the good stability for Ru/Fe 3 O 4 –Fe 3 C/NC. The high reactivity might stem from high dispersion of Ru nanoparticles, enhanced conductivity due to doping N into carbon nanosheets, and heterointerfaces between Fe–O and Fe–C.
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Journal of Water Process Engineering
·
2022
·
IF 7.34
Yu Zhang,Hong Zheng,Pengyi Zhang,Qi Zuo,Baichao Zhang,Xueying Ren
The deep purification of trace heavy metals in drinking water is of great significance and has received considerable attention worldwide. 2,5-dimercapto-1,3,4-thiadiazole (DMTD) functionalized magnetic ZIF-8 adsorbent (Fe 3 O 4 @ZIF-8-DMTD) using a novel one-pot post coordination modulation method at room temperature could effectively adsorb trace heavy metals from drinking water through cooperating with the abundant functional groups and surface charges. The negative surface charges promoted the rapid accumulation of trace heavy metals on the surface of the adsorbent, meanwhile, the abundant thiol/nitrogen sites contributed to their adsorption, thus the adsorption rate and adsorption capacity of trace heavy metals were greatly improved. For trace Pb(II) (150 ppb), the effluent concentration could meet the World Health Organization (WHO) standard (≤10 ppb) within 10 s after adsorption by Fe 3 O 4 @ZIF-8-DMTD, and the cumulative adsorption capacity that met WHO standard was 12.11 mg/g. Fe 3 O 4 @ZIF-8-DMTD also showed high stability in a broad pH range and excellent adsorption performance in a wide low concentration range. The effluent concentration still could meet the WHO standard when the initial Pb(II) concentration was 11.70 ppm, and the corresponding adsorption capacity reached 35.00 mg/g. Moreover, the capture experiments for multiple heavy metals that coexisted in tap water showed that the effluent concentrations of Hg(II), Pb(II), Cu(II), Cd(II), and Cr(III) could be lower than the allowable limits in a few minutes. The adsorbent could also be easily recovered using magnets and regenerated by thiourea solution, which showed great application potential for the purification of trace heavy metals in drinking water.
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高影响因子
Environmental Science-Water Research & Technology
·
2022
·Vol. 8
·期 11
·2796-2806
·
IF 5.819
Guohua Li,Xianjin Qi,Jiahao Shi,Guizhi Yan,Heng Wang,Aimin Zhang
Arsenic (As) pollution is a serious worldwide problem that requires urgent attention, as this heavy metal poses a serious threat to both human and environmental health. Here, Fe3O4 was used as an in situ Fe source removal agent to study the effect of pre-dissolution time on arsenic removal by Fe3O4. Fe3O4 is uniquely well suited for the treatment of industrial wastewater due to its structural characteristics. Assays were conducted at a Fe/As molar ratio of 3 : 1, and these components were pre-dissolved at 23 °C for 2 h to establish the optimal initial conditions for Fe-mediated arsenic removal at a high temperature. The adsorption capacity of arsenic in the pre-dissolution stage was 143.99 mg g−1. After adjusting the pH value to 2.5 and allowing the Fe and As to react at 90 °C for 24 h, 99.1% of the As was precipitated from the wastewater with an initial arsenic concentration of 8276.1 mg L−1. The leaching of this As-bearing precipitate was as low as 0.3 mg L−1. As a solid iron source, Fe3O4 provides a large number of nuclear sites for arsenic precipitation in the pre-dissolution stage and the high-temperature synthesis stage. At the same time, the supersaturation of the system was regulated by controlling the reaction and dissolution characteristics. Upon further characterization, the removal of As by Fe3O4 in the pre-dissolution process was attributed to a combination of physical adsorption and chemical precipitation.
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Materials Today Communications
·
2022
·
IF 3.662
Junyue Shan,Xianliang Wu,Caifang Li,Jiwei Hu,Zhenming Zhang,Huijuan Liu,Pinhua Xia,Xianfei Huang
In recent years, semiconductor materials have shown excellent potential in the field of photocatalytic degradation of antibiotics. To prepare a photocatalyst with excellent performance, an Fe 3 O 4 /rGO/Co-doped ZnO/g-C 3 N 4 tetrameric hybrid photocatalyst was successfully prepared for the first time by means of chemical precipitation using graphene oxide as the precursor. The developed quaternary photocatalyst was used for the degradation of oxytetracycline hydrochloride (OTC), and its photocatalytic activity was investigated. The structure and morphology of the composites were characterized by XRD , SEM, HR-TEM, ESR, N 2 adsorption, PL spectroscopy and UV-Vis DRS . The effects of different parameters on the degradation process were studied by the response surface method and artificial intelligence. The results showed that Fe 3 O 4 /rGO/Co-doped ZnO/g-C 3 N 4 was successfully synthesized. Under optimal conditions, the degradation rate of OTC was approximately 82% (the Fe 3 O 4 /rGO/Co-doped ZnO/g-C 3 N 4 dose was 0.16 g, the pH was 7.0, the initial concentration of OTC was 30 mg/L, and the visible light irradiation time was 70 min). pH is the most influential variable for OTC removal. At the same time, the degradation rate of OTC remained above 50% after 5 times of recycling, indicating that Fe 3 O 4 /rGO/Co-doped ZnO/g-C 3 N 4 photocatalyst had good stability and recoverability. In addition, the results of ESR and radical trapping experiments showed that·O 2 - and·OH were the main active species in the OTC removal process.
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高影响因子
MICROCHEMICAL JOURNAL
·
2022
·
IF 5.304
Mingchun Lv,Da-Wen Sun,Hongbin Pu,Haofan Zhu
Recyclable surface-enhanced Raman scattering (SERS) substrates are beneficial to cost reduction and environmental protection and have always been a research topic with great interest. Herein, a core–shell-satellite structured SERS substrate Fe 3 O 4 @MIL-100(Fe)@Ag nanoparticles (FMAs) was developed, possessing versatile functionalities of adsorption, detection, degradation and recovery. Results showed that the MIL-100(Fe) with peroxidase-like activity as shell catalyzed H 2 O 2 to generate ·OH degraded pollutants within 5 min to achieve substrate cleaning, making FMAs recyclable for at least 5 times to sequentially detect different cationic dyes with high sensitivity, having low detection limits as low as 15.24 ng/L, 387.87 ng/L and 0.71 ng/g for crystal violet in deionized water, aquaculture water and tilapia, respectively. FMAs also showed good uniformity, reproducibility and stability, with a relative standard deviation value of 5.58 % between substrates and about 78.60 % SERS activity remained after 20 d storage at 4 °C. This FMAs substrate thus has great potential for selective detection of trace cationic dyes in food or other fields.
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高影响因子
ENVIRONMENTAL ENGINEERING SCIENCE
·
2022
·Vol. 39
·期 7
·628-638
·
IF 2.172
Qian Rao,Dandan Lv,Hui-qiang Li,Qin Long
The increasing of 1-hydroxy-1,1-diphosphonoethane (HEDP) in aquatic environments poses potential harm to the environment. Herein, the materials that silver nanoparticles/nanowires (Ag NPs/Ag NWs) and Fe3O4-decorated CoAl-layered double hydroxides (LDHs-Ag NPs@Fe3O4 and LDHs-Ag NWs@Fe3O4) were synthesized and applied to the degradation of HEDP in three-dimensional electro-Fenton system. Addition of Ag-doped LDHs@Fe3O4 particles greatly increased the HEDP removal rate compared with the addition of LDHs@Fe3O4 particles. The HEDP degradation rates using LDHs-Ag NPs@Fe3O4 and LDHs-Ag NWs@Fe3O4 particles were 73.34% and 79.64%. Furthermore, based on the characterization of synthesized particles, generation of free radical and H2O2, a possible mechanism of improved oxidation performance by the LDHs-Ag NWs@Fe3O4 particles was elucidated. The LDHs-Ag NWs@Fe3O4 particles possessed excellent stability and reusability, as evidenced by the stable degradation activity of 70.53% for HEDP degradation after four successive runs.
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高影响因子
WASTE MANAGEMENT & RESEARCH
·
2021
·
IF 3.549
Yuyu Huang
In this study, the transformation and degradation mechanisms of refractory organic matter in biologically treated leachate from a semi-aerobic aged refuse biofilter (SAARB) in a nano-Fe3O4 enhanced ozonation process (nFe3O4-O3) were investigated in batch experiments. A continuous experiment then confirmed the effectiveness of the process for SAARB effluent treatment. In a batch experiment, the effects of influencing factors, including nFe3O4 dosage, O3 dosage and initial pH on the treatment performance of nFe3O4-O3 process, were comprehensively investigated. The results showed that when the nFe3O4 dosage = 6 g L−1, O3 dosage = 0.15 L minute−1 and initial pH = 7, the total organic carbon, absorbance at 254 nm and colour number removal efficiencies were 40.58%, 62.55% and 89.80%, respectively. In addition, most of the humic- and fulvic-like substances in the SAARB effluent were removed, and the condensation degree, aromaticity and humification degree of the organics were substantially reduced. The morphology and elemental valence state analysis showed that the nFe3O4 in the process was relatively stable and could form an nFe3O4-organic complex. Therefore, the probability of organics reacting with hydroxyl radical increased and the oxidation efficiency was enhanced. In the continuous experiment, both the O3 dosage and hydraulic retention time (HRT) were the key influencing factors. The treatment efficiency of the nFe3O4-O3 process was enhanced at a higher O3 dosage and longer HRT. The electrical energy consumption of the continuous nFe3O3-O3 process was calculated to be 17.72 kW h m−3 in SAARB effluent treatment. This study proved the feasibility of biologically treated landfill leachate treatment by the nFe3O3-O3 process.
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PubMed
高影响因子
JOURNAL OF COORDINATION CHEMISTRY
·
2021
·
IF 1.751
Milad Taheri
The synthesis and properties of new hybrid core-shell nanoparticles SiO2-HPW12O40@Fe3O4/EN-MIL-101(Cr) are reported. These hybrid nanomaterials were synthesized by binding of Keggin-type heteropolyacid (HPA) on diamine-activated Fe3O4 magnetic nanoparticles. The present work proposes an electroanalytical method for selective determination of losartan antihypertensive drug (LOS). Under optimal conditions, an electrochemical sensor was performed between the molecules in 0.1 M phosphate buffer (PBS) pH 6.0. Heterogeneous nanocatalysts can be easily separated from the reaction mixture using a magnet and used multiple times. The structure of the synthesized nanocatalyst was determined by various physicochemical techniques such as TEM, SEM, XRD, EDAX, TGA, and AFM.
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Journal of Energy Storage
·
2023
·
IF 9.4
Lei Wang,Meng Zhou,Heqing Fu
Phase change materials (PCMs) play a crucial role in thermal management and solar energy utilization. However, PCMs suffer from low thermal conductivity , tend to leak during the phase change process , and do not possess photothermal conversion properties, limiting their application in these fields. In this work, thermally conductive enhanced composite PCMs with photothermal conversion are fabricated by encapsulating polyethylene glycol (PEG) into Fe 3 O 4 and polyaniline (PANI) decorated carbon cloth (CC). The prepared PEG@PFCC composite PCMs exhibited high heat storage density (132.06–137.25 J/g), significantly improved leakage-proof properties, and excellent thermal and cyclic stability. Meanwhile, the continuous double-coating of PANI and Fe 3 O 4 not only gives the composite PCMs superb thermal conductivity (thermal conductivity of 1.61 W/m·K, 416 % higher than that of the pristine PEG), but also high photothermal conversion efficiency (91.5 %) and excellent electromagnetic interference (EMI) shielding (up to 38 dB), which broaden the composite PCMs' adaptability of applications. In summary, this innovative type of carbon cloth-based composite PCMs provide a creative path for the design and development of energy storage and conversion materials, which exhibit tremendous potential in the applications of electronic protection, infrared stealth, thermal management of wearable devices , and solar thermal energy utilization.
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2023
·Vol. 47
·期 47
·21654-21660
·
IF 3.3
Ye He,Panlin Wang,Zhuzheng Wu,Yating Chen,Xiaohao Gan,Fangjie Li,Wenxiang Wang
The precise identification and detection of circulating tumor cells (CTCs) is significant for the early diagnosis and prognostic treatment of cancer. However, it remains a challenge to detect CTCs with high sensitivity and specificity. In this study, a colorimetric sensor for the analysis of CTCs was constructed based on dual-aptamer recognition and core (Fe3O4)–shell (Pt) nanoparticle (Fe3O4@Pt NP) nanozymes coupled with a G-quadruplex as a signal transducer/amplifier. The results show that the linear range of the designed colorimetric sensor is 50–4000 cells and the detection limit is 4 cells. The constructed aptasensor could be extended to identify various CTCs by changing the aptamers, and holds great potential in precise tumor diagnosis.
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