JOURNAL OF THE ENERGY INSTITUTE
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2020
·
IF 4.748
Fang-Jing Liu,Jia-Pei Guo,Guang-Hui Liu,Lei-Lei Bie,Yun-Peng Zhao,Zai-Xing Huang,Xian-Yong Wei
Lignites are promising candidates as feedstocks for producing chemicals rather than used as solid fuels. Herein, a mesoporous silica-coated Fe 3 O 4 supported magnetic solid base (MSB) was prepared for catalytic hydrocracking (CHC) of Xiaolongtan lignite (XL). The effect of reaction temperature on aromatic production through CHC was investigated. The results showed that the MSB with abundant mesoporous structures has strong basic sites and superparamagnetism, which can effectively enhance producing soluble portions and aromatics from hydrocracking of XL. Both the yields of the soluble portions and aromatics from CHC of XL increased with raising reaction temperature. The maximum yield of the soluble portions reached 78 wt% at 300 °C from CHC. Phenols are the main group component from CHC of XL at 300 °C, which could be mainly generated from the cleavage of C–O bridged bonds in XL. Both the yields of phenols and arenes from CHC at 300 °C are twice more than those from CHC. It was proposed that the MSB could catalyze splitting H 2 to release active H − and facilitate H − transfer to cleave the C–O bridged bonds, resulting in producing higher yields of aromatics.
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Materials Research Express
·
2020
·Vol. 7
·期 12
·125603
·
IF 1.929
Zhixiao Wang,Qinghua Zhou,Siji Chen,Dadong Liang,Shanshan Tang,Huan Chen,Guang Chen,Yuhan Xia,Bolun Zhang
In this work, quinoa straw (QS) is considered as a sustainable biomass resource to produce adsorbent materials for wastewater treatment. Two materials, a porous carbon material derived from QS (PCQS) and a Fe3O4-containing composite material based on the PCPS (Fe3O4@PCQS), were prepared. PCQS was prepared via carbonization and subsequent chemical activation of the QS using NaOH. Thereafter, PCQS was characterized by SEM, TEM, XRD, IR, XPS, and N2 adsorption-desorption analysis. As a carbon material with heterogeneous pores, PCQS has a BET specific surface area of 3435.21 m2 g−1, which is about 175 times higher than that of the precursor QS (19.60 m2 g−1). The PCQS had an adsorption capacity of 1778.1 mg g−1 toward rhodamine B (RhB), and the adsorption followed pseudo-second-order kinetics and the Freundlich isotherm model. The PCQS was further modified by synthesizing Fe3O4 magnetic nanoparticles on the surface of PCQS to give Fe3O4@PCQS. The adsorption capacity of Fe3O4@PCQS toward RhB reached 1156.2 mg g−1, and it could be rapidly separated from water by applying an external magnetic field. The PCQS and Fe3O4@PCQS exhibited acceptable reusability which was evaluated through ten successive adsorption/desorption cycles. In summary, the adsorption capacities of PCQS and Fe3O4@PCQS toward RhB are comparable with most current adsorbents, including the graphene-based materials, which shows that QS is a promising biomass feedstock to prepare carbon-based materials and composites.
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CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Yi Wang,Chuangchuang Liu,Shaofeng Zhou,Rui Hou,Lihua Zhou,Fengyi Guan,Renlian Chen,Yong Yuan
Three-dimensional (3D) nano-structure materials with a large bacterial accessible specific area have emerged as promising electrode materials for bioelectrochemical systems (BESs), achieving high bioelectricity outputs. However, it remains a challenge that biofilms with increased thickness inhibit substrate diffusion into the 3D nano-structure during long-term operation of BESs, causing a reduction in bioenergy output. Herein, an innovative ordered 3D nano-structure electrode was fabricated by growing self-supported N-doped C/Fe 3 O 4 -nanotube composite arrays onto carbon fiber cloth ( [email protected] /Fe 3 O 4 ), using template-based deposition coupled with thermal reduction/carbonization methods. The fabricated [email protected] /Fe 3 O 4 electrode was applied as a bioelectrode in a conventional three-electrode BES and as an anode in microbial fuel cell (MFC), while their capacity to improve bioelectricity generation was assessed. Results indicate that the hierarchical N-doped C-coated nanotube arrays not only significantly enhanced conductivity and areal capacitance of the electrode, but also reduced its charge transfer resistance and provided the 3D open nano-structure with excellent biocompatibility for microbial colonization and internal diffusion of the culture substrate. Consequently, a high maximum current density (4.11 mA/cm 2 ) and coulombic efficiency (~89%) was obtained from the [email protected] /Fe 3 O 4 electrode after about 3 months of BES operation, exhibiting higher biocatalytic performance and extracellular electron transfer efficiency than the original carbon fiber cloth (CC, 1.89 mA/cm 2 ). Moreover, MFC equipped with [email protected] /Fe 3 O 4 anode produced a maximum power density of 1.21 ± 0.04 W/m 2 , which was 2.1 times higher than CC (0.58 ± 0.03 W/m 2 ). This study demonstrates the outstanding advantages of [email protected] /Fe 3 O 4 nanotube composite arrays assembled on CC, making it a potential alternative to existing 3D electrodes for high-performance BES applications.
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COMPOSITES COMMUNICATIONS
·
2020
·
IF 4.915
Yanlin Li,Wenyuan Duan,Ai Fujisaka,Toshihiro Moriga,Xuegang Lu,Sen Yang
Monodisperse Fe 3 O 4 @PS colloidal particles with hollow core/shell structure and high saturation magnetization were successfully fabricated by a facile chemical approach. Owing to magnetic nature of iron oxide core and positively charged polystyrene shell, the colloidal particles in suspension assembled into ordered array and showed dual-response behavior to magnetic and electric field. When the cooperation between magnetic and electric field matched well, the photonic crystals showed better structural color and higher reflectivity . Consequently, as-synthesized Fe 3 O 4 @PS colloids have great potentials in some high-tech fields such as color sensors, color display, camouflage, electronic papers, and so on.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2020
·
IF 3.99
Guoli Xu,Zhi Zhang,Tao Li,Meiling Du,Yueping Guan,Chen Guo
In this study, a sea urchin-like Fe 3 O 4 /ZnO/ZnSe hierarchical heterostructured photocatalyst was successfully prepared via a convenient synthetic strategy and combined with a newly designed photocatalytic magnetically fixed bed reactor (PMFBR) to continuously photodegrade pollutants under simulated solar light irradiation. In the experiment, ZnO nanorods were first grafted onto the surfaces of hollow Fe 3 O 4 nanoparticles, and then ZnSe nanoparticles were uniformly distributed on the ZnO nanorods, the obtained Fe 3 O 4 /ZnO/ZnSe composite exhibited three-dimensional structure and excellent magnetic response. Through citing PMFBR, a stable and homogeneously distributed heterogeneous catalyst, efficient light distribution, and good mass transfer of reactants were achieved. As a result, the Fe 3 O 4 /ZnO/ZnSe composite in the PMFBR showed excellent photocatalytic capacity with a continuous process. The combination of the magnetic photocatalyst and PMFBR transformed the reaction mode from cumbersome intermittent operation to a simple continuous-flow photocatalytic style. It is hoped that this continuous photocatalytic system could provide a new idea for large-scale wastewater treatment.
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ACS Omega
·
2020
·
IF 2.87
Jiaping Guo,Yameng Wang,Shanshan Niu,Hongping Li,Yongmei Tian,Songcheng Yu,Fei Yu,Yongjun Wu,Li-e Liu
The aim of this study is to establish a new method with high sensitivity, accuracy, and stability for the determination of human IgG and then expand it to analyze severe acute respiratory syndrome corona virus 2 (SARS-CoV-2)-specific IgM and IgG, which is of great significance for the screening and diagnosis of COVID-19. In this study, the magnetic Fe3O4 nanospheres coupled with mouse antihuman IgG (Ab1IgG) were used as an immune capture probe (Fe3O4@Ab1IgG) to capture and separate the target, and rabbit antihuman IgG (Ab2IgG) coupled with highly luminescent quantum dot nanobeads (QBs) as a fluorescence detection probe (QBs@Ab2IgG) was used to realize high sensitivity detection. After the formation of a sandwich immunocomplex, the fluorescence intensity of the precipitate after magnetic separation was measured at the excitation wavelength of 370 nm. Under optimal conditions, a wide linear range varying from 0.005 to 40 ng·mL–1 was obtained for the detection of human IgG with a lower limit of detection at 4 pg·mL–1 (S/N = 3). The recoveries of intra- and interassays were 90.0–101.9 and 96.0–106.6%, respectively, and the relative standard deviations were 6.3–10.2 and 2.6–10.5%, respectively. Furthermore, the proposed method was successfully demonstrated to detect human IgG in serum samples, and the detection results were not statistically different (P > 0.05) from commercial enzyme-linked immunosorbent assay kits. This method is sensitive, fast, and accurate, which could be expanded to detect the specific IgM and IgG antibodies against SARS-CoV-2.
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PubMed
高影响因子
Analytical Methods
·
2020
·Vol. 12
·期 36
·4457-4465
·
IF 2.596
Meng Zhang,Jie Chen,Faqiong Zhao,Baizhao Zeng
In this work, a simple and sensitive method based on Fe3O4/multi-walled carbon nanotubes/ionic liquid (Fe3O4/MWCNTs/IL) as the adsorbent for magnetic solid phase extraction coupled with high performance liquid chromatography was developed for the determination of trace fluoroquinolones in foods. After a simple one-pot solvothermal synthesis, Fe3O4/MWCNTs were further modified with an amine-terminated ionic liquid to enhance their dispersibility and extraction capacity. The morphology, structure and magnetic properties of the composite adsorbent were characterized by transmission electron microscopy, X-ray photoelectron spectroscopy, Fourier transform infrared spectroscopy, X-ray diffraction spectrometry and vibrating-sample magnetometry. Under the optimized extraction and detection conditions, the studied fluoroquinolones were enriched effectively and separated well and their UV signals were linear to their concentrations in the range of 4–1000 ng mL−1, with correlation coefficients ranging from 0.9958 to 0.9990. The enrichment factors were 29.1–43.9 fold and the limits of detection were 0.33–0.78 ng mL−1. The spiked recoveries were 85.4–105.9% for milk and 85.2–103.7% for pork samples, with relative standard deviations of 0.8–5.7%. The developed method provided a fast, sensitive and reliable determination platform for fluoroquinolones in complex real samples.
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Analytical Methods
·
2020
·Vol. 12
·期 22
·2872-2880
·
IF 2.596
Yahui Wang,Meng Yan,Qianqian Ji,Manman Wang,Qian Wang,Xuesheng Wang,Yulan Hao
In this work, a magnetic material (Fe3O4-NH2@MIL-101) was successfully prepared, and the material was used as a sorbent for the magnetic solid-phase extraction (MSPE) of trace level monohydroxy polycyclic aromatic hydrocarbons (OH-PAHs) from urine samples for the first time. The target analytes were quantified by high performance liquid chromatography coupled with fluorescence detection (HPLC-FLD). The MSPE key factors, which include the amount of adsorbent, extraction time, pH, the effect of salt, eluting solutions and eluant volume, were systematically optimized. Under the optimized conditions, the developed method showed good linearity (0.03–200 ng mL−1), low limits of detection (0.016–0.042 ng mL−1, signal-to-noise ratio = 3) and satisfactory repeatability (relative standard deviation ≤ 10.1%, n = 5). The method showed stable average recoveries ranging from 78.3% to 112.9% and the enrichment factors were 9 to 15. Besides the satisfactory method parameters, the total MPSE process could be completed in no more than 5 minutes. These results indicated that Fe3O4-NH2@MOF based MSPE was a simple, efficient and fast method which was suitable for MSPE of OH-PAHs from urine samples.
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Polymers
·
2020
·Vol. 12
·期 1
·72
·
IF 3.426
Qiang Sun,Huaili Zheng,Xuebin Hu,Jun Li,Rui Zhao,Chun Zhao,Wei Ding
In this study, a novel system was set up by preparing a magnetic flocculant combining with ultraviolet/H2O2to realize the rapid enrichment and degradation of diclofenac sodium (DCFS). For the magnetic flocculant, template anion polyacrylamide (TAPAM) with anion micro-block structure was prepared. Thereafter, polydopamine was used to modify TAPAM, Fe3O4nanoparticles was grafted to the modified TAPAM by chelation, named template anion polyacrylamide-polydopamine-Fe3O4(TAPAM-PDA-Fe3O4). Furthermore, the TAPAM-PDA-Fe3O4preparation protocol was optimized by the response surface method (RSM). In the DCFS enrichment section, the rapid separation of flocs from water was realized by an external magnetic field and it indicated that the π–π stacking effect was dominant in neutral/alkaline condition, whereas charge neutralization was favored in acidic conditions. Meanwhile, a DCFS enrichment kinetic curve was much fitted by the pseudo-second-order kinetic model and DCFS enrichment isothermal curve was close to the Freundlich isothermal model, indicating the dependence of DCFS quantity enriched by TAPAM-PDA-Fe3O4and a multilayer heterogeneous enrichment process. The degradation experiment confirmed that DCFS was effectively degraded by ultraviolet/H2O2/TAPAM-PDA-Fe3O4and the maximum value of DCFS degradation efficiency reached 98.1%. Furthermore, the regeneration experiment showed that the enrichment and degradation efficiency of DCFS could maintain a relatively high level in the initial three recycles.Keywords:diclofenac sodium;π–π stacking;charge neutralization;enrichment;degradation
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Analytical Methods
·
2019
·Vol. 12
·期 1
·104-111
·
IF 2.378
Jianmin Wang,Wei Yang,Qiling Peng,Daobin Han,Liangsheng Kong,Lu Fan,Min Zhao,Shijia Ding
Rapid and simple detection of carbapenem-resistant Enterobacteriaceae (CRE) is important to manage infection and prevent the spread of these bacteria. In this work, we utilize pH response to detect CRE in urine rapidly. By using vancomycin-modified Fe3O4@Au nanoparticles (Fe3O4@Au@VanNPs), CRE in urine were enriched and separated efficiently via vancomycin–cell wall interaction. More importantly, carbapenemases released via CRE lysis were detected using a pH metre which responded to hydrogen ions generated from imipenem hydrolysis. Thus, the concentration of CRE in urine was detected via the carbapenemase hydrolysis reaction. The proposed method demonstrated a good linear relationship in the range of 104–108 cfu mL−1 for CRE with the limit of detection estimated to be 1.0 × 103 cfu mL−1. More importantly, this method successfully detected clinically isolated CRE strains in urine samples within 3.5 h. Thus, this biosensing strategy might have the potential for practical application in the rapid detection of various resistant bacteria.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Caiwen Wu,Tianyi Guo,Yuhan Chen,Qiang Tian,Yanjuan Zhang,Zuqiang Huang,Huayu Hu,Tao Gan
Photoinduction is widely used to accelerate the Fe 3+ /Fe 2+ circulation in Fe 3+ /H 2 O 2 Fenton oxidation, however, the remained challenges in developing a facile, economical, and efficient synthetic methodology for the preparation of high-performance Fe-based Photo-Fenton catalyst and inevitably forming iron sludge limit its applications. Herein, starch-derived carbon (SC) encapsulated Fe 3 O 4 (Fe 3 O 4 @SC) magnetic nanocomposites are synthesized by mechanical activation treatment combined with high-temperature pyrolysis method using cassava starch as the carbon source. The photoelectrochemical properties of Fe 3 O 4 @SC are regulated by C O Fe bonds and oxygen vacancies in Fe 3 O 4 @SC, as well as graphitization of SC, which effectively accelerate the Fe 3+ /Fe 2+ circulation in Fe 3 O 4 @SC + H 2 O 2 system under visible light, thus Fe 3 O 4 @SC shows excellent catalytic performance and superior stability for the degradation of tetracycline hydrochloride, and the initiation rate constant is 2.4 times higher than that in dark. Moreover, quenching experiments and electron spin resonance results confirm that OH, O 2 − , and h + ( OH plays a critical role) are generated in the catalytic system of Fe 3 O 4 @SC + H 2 O 2 + visible light. This work provides new insights into a green and facile approach for the synthesis of Photo-Fenton catalysts, providing new avenue for the acceleration of Fe 3+ /Fe 2+ cycle under visible light-driven Fenton process.
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JOURNAL OF CHROMATOGRAPHY A
·
2023
·
IF 4.1
Chun-Ying Xu,Yuan-Yuan Cui,Cheng-Xiong Yang
Endocrine disrupting chemicals (EDCs) are a typical class of natural or man-made endogenous hormone agonists or antagonists that can directly or potentially interfere with human endocrine system. However, it is still difficult to analyze trace EDCs directly from complex environment and food matrices. Therefore, the proper sample pretreatment is highly desired and the preparation of efficient adsorbents is of great challenge and importance. Herein, we report the facile one-pot solvothermal synthesis of Fe 3 O 4 nanoparticle doped magnetic β-cyclodextrin microporous organic network composites (MCD-MONs) for the magnetic solid phase extraction (MSPE) of four phenolic EDCs in water and food takeaway boxes prior to the high-performance liquid chromatography analysis. The sheet-like Fe 3 O 4 doped MCD-MONs offered good magnetic property (16.5 emu g −1 ) and stability, and provided numerous hydrogen bonding, hydrophobic, π-π, and host-guest interaction sites for EDCs. Under the optimal experimental conditions, the established method was successfully verified with wide linear range (2.0–1000 µg L −1 ), low limits of detection (0.6–1.0 µg L −1 ), good precisions (intra-day and inter-day RSDs < 5.2 %, n = 3), large enrichment factors (88–98) and adsorption capacity (90.3–255.8 mg g −1 ), short extraction time (6 min), less adsorbent consumption (3 mg), and good reusability (at least 8 times) for EDCs. The proposed method was successfully applied to detect the trace EDCs in real samples with the recovery of 84.0–99.7 %. This work demonstrated the great potential of MCD-MONs for the efficient MSPE of trace EDCs from complex food takeaway boxes and water samples and uncovered the prospect of CD-based MONs in sample pretreatment.
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