ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2021
·Vol. 28
·期 29
·39199-39209
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IF 4.223
Peng Yecan,Ye Guirong,Du Yangliu,Zeng Lingyu,Hao Jiawen,Wang Shuangfei,Zhou Jinghong
This study focused on the feasibility of using Fe 3 O 4 /graphene oxide (FGO) nanocomposites as heterogeneous catalysts for the advanced treatment of real industrial wastewater. FGO nanocomposites with different graphene oxide (GO) ratios were synthesized by coprecipitating iron salts onto GO sheets in basic solution. The characterization of the resulting material structures and functionalities was performed using a range of analytical techniques. A low GO loading afforded a good Fe 3 O 4 nanoparticle dispersibility and resulted in a higher Brunauer–Emmett–Teller surface area and pore volume. The FGO nanocomposites and pure Fe 3 O 4 were used to treat papermaking wastewater in a heterogeneous photo-Fenton process. The results suggested that the nanocomposite designated FGO1 (GO loading of 25 mg) exhibits a higher photocatalytic efficiency than other FGO nanocomposites and pure Fe 3 O 4 . A maximum chemical oxygen demand degradation efficiency of 89.6% was achieved in 80 min with 1.5 g L −1 FGO1 at pH 3. The degradation of different pollutants present in wastewater was evaluated with the aid of gas chromatography–mass spectrometry and 3D excitation–emission-matrix analysis. Inductively coupled plasma atomic emission spectroscopy and magnetic measurements confirmed that the FGO1 nanocomposites possess a low iron leachability and a high reusability. Thus, a comprehensive advanced treatment of real industrial wastewater using a magnetic FGO catalyst is demonstrated.
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高影响因子
Journal of Materials Chemistry C
·
2021
·Vol. 9
·期 19
·6316-6323
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IF 7.393
Yuexuan Li,Yugang Duan,Xiaoqing Kang
Microwave absorption materials (MAMs) are specialist kinds of composites applied in stealth technology and electromagnetic interference (EMI). However, it is tough to satisfy the ultrathin and broadband requirements due to the imperfect impedance matching with external air and single absorbing fillers. Herein, a lower concentration of short carbon fiber (SCF)/Prussian blue (PB)/Fe3O4/epoxy resin (EP)-based butterfly-scale metamaterial (BSM) absorber with ultrathin and broadband was achieved via integrated design and fabrication. This revealed that the synergic effect between the SCF/PB/Fe3O4/EP MAMs with dielectric–magnetic behavior and physical resonance loss of the periodic unit for the BSM absorber is profitable for improving the electromagnetic absorption performance. Furthermore, the integrated fabrication process completely avoided the interface effect in traditional metamaterials. As a result, the proposed BSM absorber exhibited an absorption bandwidth of 29.54 GHz below −9.5 dB (>88.7% absorption) under TE = 0° polarization in the 2–40 GHz frequency range and 35 GHz below −9.5 dB under TM = 50° polarization. Analysis of the micro- and macro-absorption mechanism implied that the magnetic loss mainly resulted in power loss compared with dielectric loss. This highlights that the BSM absorber is an appropriate candidate for further practical applications, such as communication devices and military equipment.
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MICROCHIMICA ACTA
·
2021
·Vol. 188
·期 2
·1-10
·
IF 5.833
Xu Xu,Feng Xue,Liu Zhen,Xue Shan,Zhang Lei
A low cost-effective and simple synthesis method was adopted to acquire three-dimensional flower-like structure Fe 3 O 4 /C that has large specific area, suitable pore structure and sufficient saturation magnetism. The obtained Fe 3 O 4 /C exhibits outstanding preconcentration ability and was applied to extracting non-steroidal anti-inflammatory drugs from complex environmental and biological samples. The parameters of magnetic solid-phase extraction were optimized by univariate and multivariate methods (Box-Behnken design). The high degree of linearity from 2.5 to 1000.0 ng mL −1 (R 2 ≥ 0.9976), the limits of detection from 0.25 to 0.5 ng mL - 1 (S/ N = 3), and the limits of quantitation from 1.0 to 2.0 ng mL - 1 (S/ N = 10) were yielded by adopting this novel method after the optimization. Moreover, the recoveries of non-steroidal anti-inflammatory drugs from 89.6 to 107.0% were acquired in spiked plasma, urine and lake samples. In addition, the adsorption of non-steroidal anti-inflammatory drugs on Fe 3 O 4 /C was explored by adsorption isotherms and kinetic studies. Furthermore, the adsorption mechanism for non-steroidal anti-inflammatory drugs by Fe 3 O 4 /C was proposed, which was hydrogen bonding and π-π interaction between non-steroidal anti-inflammatory drugs and Fe 3 O 4 /C.
Graphical abstract
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ChemElectroChem
·
2021
·Vol. 8
·期 23
·4480-4489
·
IF 4.59
Yapeng Yuan,Zhen Kong,Lei Qiao,Zhengguan Xu,Zongyu Wang,Xinghe Teng,Yuhao Dong,Xuehua Liu,Aiping Fu,Yanhui Li,Hongliang Li
Graphical Carbon-encapsulated Fe 3 O 4 nanospheres anchored on carbon nanotubes (Fe 3 O 4 /CNTs@C) have been rationally designed and fabricated. The material shows promising cycle-life and capacity properties for lithium-ion-battery applications. The application of Fe 3 O 4 as anode material for lithium-ion batteries is hindered by the capacity fade owing to its enormous volume expansion and the inherent low conductivity. Herein, carbon-encapsulated Fe 3 O 4 nanospheres anchored on carbon nanotubes (Fe 3 O 4 /CNTs@C) have been successfully fabricated. The obtained Fe 3 O 4 /CNTs@C composites show that numerous Fe 3 O 4 nanospheres are held and connected by the CNT network, forming a composite of porous three-dimensional structure. The unique structure improves the conductivity and structural stability of the Fe 3 O 4 /CNTs@C composite. The encapsulation with carbon enhances the contact between Fe 3 O 4 nanospheres and carbon nanotubes and shortens the ion-transport path. As a result, the Fe 3 O 4 /CNTs@C delivers a high capacity of 612 mA h g −1 at 1 A g −1 , even after 200 cycles, and shows a superior rate performance of 523 mA h g −1 at 5 A g −1 . This work provides a preparation strategy that could be easily applied to other functional materials for energy storage and/or catalysis.
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NEW JOURNAL OF CHEMISTRY
·
2021
·Vol. 45
·期 15
·6880-6888
·
IF 3.591
Tao Gong,Rina Cheng,Xiaoyu Wang,Jing Li,Wenting Liang,Zhihong Wei,Shaomin Shuang,Yuyao Wang,Rui Guo
Herein, triformyl cholic acid-modified Fe3O4 magnetic nanoparticles (TCA-MNPs) were first constructed and developed as a novel drug carrier, possessing a uniform size of 12 ± 2 nm, superparamagnetic response, and good stability. Doxorubicin hydrochloride (DOX) and epirubicin hydrochloride (EPI) could effectively aggregate on the surface of TCA-MNPs via triformyl cholic acid regulatory hydrogen-bonding interaction and the π–π stacking-induced self-assembly of drug molecules. The loading capacity of DOX and EPI reached up to 1363.6 mg g−1 and 1293.5 mg g−1, respectively. Moreover, the release of loaded drugs could be achieved by adjusting the acidic microenvironment of cancer cells. Significantly, the drug-loaded nanocomposite (TCA-MNPs/DOX) showed the functions of triformyl cholic acid-mediated hepatocyte recognition and magnetic-guided targeting for the synergistic targeted therapy of hepatoma cells in vitro and in vivo. These findings demonstrate that the as-prepared drug nanocarriers have potential practical application values for the diagnosis and treatment of hepatocellular carcinoma.
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Environmental Technology & Innovation
·
2021
·
IF 5.263
Lihua Liu,Gang Su,Xing Liu,Wenhao Dong,Mengyuan Niu,Qiujuan Kuang,Anping Tang,Jianrong Xue
A novel magnetic core–shell architecture Fe 3 O 4 @Sio 2 @Bi 2 O 2 CO 3 –sepiolite composite was successfully fabricated by coating a layer of Bi 2 O 2 CO 3 –sepiolite mixture onto Fe 3 O 4 @Sio 2 cores through a facile hydrothermal method. The photodegradation rates of ciprofloxacin (CIP) and tetracycline hydrochloride (TC-H) were 92.1% and 100%, respectively. A suitable amount of sepiolite in Fe 3 O 4 @Sio 2 @Bi 2 O 2 CO 3 –sepiolite can enlarge the specific surface area, promote the formation of an excellent photocatalyst structure, and generate a strong interfaces effect between the sepiolite and Fe 3 O 4 @Sio 2 @Bi 2 O 2 CO 3 . This condition endowed the as-prepared photocatalyst with high light harvesting capability and abundant active reaction sites. It also boosted the separation of photogenic e − /h + pairs. Moreover, this condition inhibited the recombination of e − /h + pairs and decreased the energy band gap, thereby enhancing the visible light catalytic degradation of antibiotics. The active species produced during photocatalysis included h + and •O 2 − , with h + as the dominant active species. The as-prepared photocatalyst exhibited excellent photocatalytic degradation activity, magnetic separation performance, recyclability , and stability.
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NEW JOURNAL OF CHEMISTRY
·
2021
·Vol. 45
·期 12
·5605-5620
·
IF 3.591
Yuhua Niu,Xingxing Han,Jie Song,Liangxian Huang
Novel magnetic gel beads were successfully fabricated via a polyvinyl alcohol (PVA) and sodium alginate (SA) double-cross-linked network and loaded with ferroferric oxide@potassium humate (Fe3O4@KHA) nanoparticles. The PVA/SA/Fe3O4@KHA gel beads were found to exhibit an excellent removal efficiency for methylene blue (MB) dye and Pb(II). The physicochemical properties of these gel beads were systematically characterized using Fourier-transform infrared spectroscopy (FT-IR), X-ray diffraction, thermogravimetric analysis, scanning electron microscopy, zeta analysis, Brunauer–Emmett–Teller analysis and vibrating sample magnetometry. The adsorption process was found to follow a pseudo-second-order kinetic model and the experimental data were in good agreement with the Langmuir model, with maximum adsorption capacity values of 781.92 and 347.19 mg g−1 for MB and Pb(II) at 298 K, respectively. The thermodynamic measurements demonstrate that adsorption onto these gel beads was spontaneous, endothermic, and driven by an increase in the system entropy. Furthermore, FT-IR and X-ray spectroscopy investigations demonstrate that the mechanism through which Pb(II) was removed mainly involved chelation by the carboxyl groups, whereas MB adsorption takes place via H-bonding and electrostatic interactions. Notably, PVA/SA/Fe3O4@KHA showed high selectivity for MB adsorption. Additionally, the prepared magnetic gel beads could be readily regenerated and efficiently reused for several cycles and their excellent magnetic properties can simplify the adsorbent separation process.
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CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Shizong Wang,Jianlong Wang
High efficient activator is highly desired in the field of persulfate-based advanced oxidation process. In comparison with the previous studies, this study adopted nitrogen, sulfur and oxygen co-doped carbon material to support Fe 0 encapsulate in Fe 3 O 4 to prepare iron-based modified carbon composite (Fe 0 @Fe 3 O 4 -MC) by a facile two-step pyrolysis. Fe 0 @Fe 3 O 4 -MC was then used for degradation of sulfamethoxazole. The results showed that Fe 0 @Fe 3 O 4 -MC had superior catalytic activity for PMS activation due to the synergistic effect of iron-based compound and modified carbon. In the presence of 0.1 g/L of Fe 0 @Fe 3 O 4 -MC, SMX (0.04 mM) could be completely degraded within 120 min at pH 3.4 and 3 mM of PMS. The SMX degradation followed pseudo first-order kinetic model, with the rate constant of 0.12 min −1 , and the mineralization of SMX achieved 48.4%. Sulfate radicals dominated in the SMX degradation. In addition to Fe 0 and Fe 3 O 4 , carbon defects, graphitic N, sulfur and FeN 4 also contributed to PMS activation. Fe 0 oxidation was the rate-limiting step for PMS activation. Dissolved oxygen made a minor contribution to Fe 0 oxidation. The intermediate products of SMX degradation were identified, and two pathways of SMX degradation were proposed. The influencing factors on SMX degradation were studied, including pH, temperature, PMS concentration, Fe 0 @Fe 3 O 4 -MC dosage, chloridion, carbonate and humic acids, and the influencing mechanism was discussed. This study could provide an efficient PMS activator for the degradation of emerging organic pollutants in water and wastewater.
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ACS Applied Nano Materials
·
2021
·
IF 5.097
Wenyan Meng,Yiyun Gao,Zhenfen Tian,Weijie Xu,Jiagao Cheng,Shengke Li,Aihua Zou
A magnetic metal–organic framework nanocomposite as a collectable pesticide delivery vehicle was developed through the incorporation of UiO-66 with polydopamine-coated Fe3O4 (Fe3O4@PDA@UiO-66). The obtained Fe3O4@PDA@UiO-66 nanocomposite was verified by X-ray diffraction, Fourier transform infrared spectroscopy, transmission electron microscopy, and zeta potential test. The magnetic collectability of Fe3O4@PDA@UiO-66 was demonstrated through a magnetic hysteresis loop study (∼2 emu/g) and magnetic collection experiment (up to a 96% collection rate). Imidacloprid (IMI) was employed as a model pesticide to be loaded into the Fe3O4@PDA@UiO-66 nanocomposite, with 15.87% drug loading. IMI was found to exhibit sustained-release behavior after being loaded into the delivery vehicle, and magnetic Fe3O4@PDA@UiO-66 can be readily collected after IMI release, which is beneficial to constrain the hazardous effects of the vehicles and the residual pesticide on the ecosystem. The insecticidal activity of IMI@Fe3O4@PDA@UiO-66 toward Aphis craccivora Koch was found to be superior to that of free IMI, and the efficacy was comparable to that of the commercial 70% IMI water dispersible granule, indicating its potential as a magnetic collectable green carrier for pesticides in agriculture.
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ADVANCED POWDER TECHNOLOGY
·
2021
·
IF 4.833
Li-Wang Jiang,Feng-Tao Zeng,Yi Zhang,Meng-Ya Xu,Ze-Wu Xie,Hua-Ying Wang,Ying-Xuan Wu,Fu-An He,Hong-Liu Jiang
A novel composite basing on the Fe 3 O 4 nanoparticle, the graphite oxide nanosheet (GON), and the citric acid-crosslinked β-cyclodextrin polymer (CA-CDP) was prepared for the purpose of removing the methylene blue (MB) dye from water. The structure of the resultant Fe 3 O 4 /GON/CA-CDP composite was investigated by the scanning electron microscope, the two dimensional EDS mapping, the thermal gravimetric analyzer, the Fourier transform infrared spectroscope, the wide angle X-ray diffraction, the X-ray photoelectron spectroscope, and the zeta potential measurement. The Fe 3 O 4 /GON/CA-CDP composite not only had a good MB adsorption capacity of 173 mg/g but also a high saturation magnetization of 36.4 emu/g. It was found that the MB adsorption capacity of the Fe 3 O 4 /GON/CA-CDP composite increased with the increasing initial MB solution pH value especially in the low-pH-value range. Moreover, the MB adsorption mechanism, the MB adsorption isotherm, and the MB adsorption kinetic of the Fe 3 O 4 /GON/CA-CDP composite were investigated. It was found that 1) the good adsorption ability of the Fe 3 O 4 /GON/CA-CDP composite for the MB dye originated from the electrostatic attraction, the Lewis acid-Lewis base interaction, the host-guest supramolecular interaction and the π-π interaction, and 2) the MB adsorption isotherm and the MB adsorption kinetic of the Fe 3 O 4 /GON/CA-CDP composite could be well explained by the Sips model and the intraparticle diffusion model, correspondingly.
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Journal of Environmental Chemical Engineering
·
2020
·
IF 4.3
Lei He,Lutao Yang,Luxia Zhang,Zhe Wang,Hongjie Cheng,Xiaoguang Wang,Jianrong Lv,Jun Zhang,Hong Mo,Jian Shen
The high salinity of oilfield-produced water caused by the presence of metal ions, such as Ca 2+ and Mg 2+ , has a significantly adverse effect on oil recovery. It is crucial to remove these metal ions efficiently before the oilfield wastewater is reinjected down into the oil wells. To address this issue, we prepared a PEG/Fe 3 O 4 /GO-NH 2 nanoadsorbent by aminating GO, incorporating magnetic Fe 3 O 4 nanoparticles and coating with PEG (PEG = poly(ethylene glycol); GO-NH 2 = aminated graphene oxide). We investigated the removal ratios of the nanoadsorbent for Ca 2+ and Mg 2+ . The respective removal ratios for Ca 2+ and Mg 2+ reached 69.8 % and 61.1 % at 10 min, indicating that the nanoadsorbent was capable of efficiently removing Ca 2+ and Mg 2+ . We also evaluated the reusability of the nanoadsorbent by recycling and reusing it 5 times. At the fifth recycling run, the nanoadsorbent retained relatively high reuse rates (79.1 % for Ca 2+ , 69.5 % for Mg 2+ ) and removal ratios (69.5 % for Ca 2+ , 64.3 % for Mg 2+ ), suggesting that the nanoadsorbent possessed relatively high reusability. Oilfield wastewater treated with the nanoadsorbent was employed for oil recovery in core displacement experiments. The oil recovery efficiency significantly increased by 11.8 % compared with untreated oilfield wastewater. Therefore, the PEG/Fe 3 O 4 /GO-NH 2 nanoadsorbent exhibits considerable potential for the treatment of oilfield wastewater to enhance oil recovery.
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CHEMOSPHERE
·
2020
·
IF 5.778
Hanwen Yang,Jie Zhou,Enxiang Yang,Huanxuan Li,Shengji Wu,Wei Yang,Hui Wang
The design of sustainable, effective and recyclable hybrid catalysts for advanced oxidation processes is highly significant for remediation of the water environment. In this study, we synthesized magnetic Fe 3 O 4 – N -doped carbon sphere composite catalysts (Fe 3 O 4 -NCS- x ) for efficient removal of tetracycline by activating peroxymonosulfate (PMS). The Fe 3 O 4 -NCS- x composite was obtained by facile hydrothermal treatment of chitosan-iron complexes followed by pyrolysis . The unique structure of N -doped carbon spheres embedded in Fe 3 O 4 nanoparticles intensified the electron transport, consequently improving the catalytic activity via a synergistic effect. Factors influencing the catalytic activity of the Fe 3 O 4 -NCS-2 were systematically investigated. High degradation efficiency of TC—97.1% within 1 h—was achieved in this Fe 3 O 4 -NCS-2/PMS system under the optimum conditions ( C 0 = 20 mg L −1 , catalyst dosage 0.2 g L −1 , PMS concentration 2.4 mM, native pH and 25 °C). The inhibitory effect of anions in the water matrix decreased in the order Cl − > NO 3 − > SO 4 2− > CH 3 COO − > HCO 3 − . The obtained results from the competitive quenching tests and electron paramagnetic resonance measurements demonstrated that singlet oxygen ( 1 O 2 ), a non-radical species, plays a major role in TC degradation. It is estimated that 1 O 2 and hydroxyl radicals ( · OH) contributed ∼65.2% and ∼24.2% to TC degradation in the Fe 3 O 4 -NCS-2/PMS system, respectively. The M-H hysteresis loop of Fe 3 O 4 -NCS-2 revealed that its saturation moment is 56 emu g −1 . Magnetic responsive behavior and consecutive runs confirmed that Fe 3 O 4 -NCS-2 possesses remarkable separation performance and desirable reusability. This novel magnetic Fe 3 O 4 -NCS-2 composite activator for PMS promises great potential in TC degradation.
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