CHEMICAL ENGINEERING JOURNAL
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2024
·
IF 13.3
Hong Li,Diyun Chen,Weixing Han,Jun He,Gang Song,Lingjun Kong,Minhua Su
Wastewater from uranium mining activities is highly acidic and contains uranium, thereby posing severe risks to the ecological environment and human health. Accordingly, uranium purification is extremely crucial. Herein, we delicately designed a novel adsorbent of diethylenetriaminepenta(methylenephosphonic) acid (DTPMP) and meso -SiO 2 modified γ-Fe 2 O 3 (γ-Fe 2 O 3 @SiO 2 @DTPMP, denoted as FSD), and found that the adsorbent can remarkably boost the removal performance of U(VI) under highly acidic conditions. The removal efficiencies of U(VI) by FSD are 90.26 % and 99.81 % in strong acidic solutions of pH = 1.0 and pH = 2.0, respectively, which are much higher than most of the reported adsorbents. Importantly, FSD exhibits high adsorption capacity (51.45 mg/g) and excellent anti-interference, even the wastewater stream contained a lot of organic substances ( e.g. , fulvic acid), cations ( e.g. , K + , Na + , Mg 2+ , NH 4 + , Zn 2+ , Co 2+ , etc.), radioactive nuclides ( e.g. , Cs + and Sr 2+ ). After five cycles, the adsorption efficiency and desorption efficiency of FSD only reduced by 8.83 % and 9.61 %, respectively, which are mainly attributed to the unique structures and good chemical stability of FSD. The removal of U(VI) by FSD is a heterogeneous adsorption process which is dominated by chemical adsorption, mainly involving surface coordination complexation. Multiwfn wavefunction and VMD programs based on density functional theory (DFT) further analyzed and visualized the interaction sites and relative strengths of reactions. The results of detailed characterization analysis and theoretical calculations confirmed that the highly efficient U(VI) removal by FSD is mainly ascribed to the strong coordination of the phosphate groups and amino nitrogen atoms in DTPMP with UO 2 2+ . Therefore, this study provides a promising strategy for the removal of U(VI) in strongly acidic wastewater.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
Materials Science & Engineering C-Materials for Biological Applications
·
2019
·
IF 4.959
Jin Feng,Qingshan Shi,Yulian Li,Jianfei Huang,Ruimin Li,Xiulin Shu,Wenru Li,Xiaobao Xie
Nanocomposites composed of Ag and γ-Fe 2 O 3 nanoparticles within poly-γ-glutamic acid (γ-PGA) derived amorphous carbon nitride (a-CN) films (Ag + γ-Fe 2 O 3 @a-CN) were synthesized by a one-step facile pyrolysis strategy. Transmission electron microscopy analysis shows that Ag and γ-Fe 2 O 3 nanoparticles were obtained in situ and homogeneously dispersed on the a-CN matrix. The average size of nanoparticles was 8.1 nm. The presence of γ-Fe 2 O 3 , Ag, and a-CN in the nanocomposite was confirmed by X-ray diffraction analysis, UV–visible absorption spectroscopy, Raman spectroscopy, and X-ray photoelectron spectroscopy. Ag + γ-Fe 2 O 3 @a-CN catalyzed the degradation of methyl orange. This catalyst was also recycled ten times by magnetic separation without any loss in efficiency. Ag + γ-Fe 2 O 3 @a-CN exhibited strong antibacterial activity against E . coli and S . aureus . It also exhibited excellent antibacterial activity even after 20 times magnetic recycling. This indicates that this is a promising recyclable antibacterial and catalyst for environmental applications.
研究领域:
材料科学
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纳米技术
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环境科学
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化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2022
·
IF 14.224
Chengyu Zhang,Zhisheng Yu,Xiangyang Wang,Bobo Wang
In this study, a novel γ-Fe 2 O 3 /biochar (BF γ ) composite by a plant in-situ enrichment and one-step pyrolysis strategy was prepared, which was applied as a photocatalyst to activate peroxymonosulfate (PMS) for the degradation of p-chlorophenol (4-CP) under visible light irradiation (BF γ /PMS/Vis) system. The characterization results exhibited that γ-Fe 2 O 3 with localized carbon doping was evenly embedded in biochar during the pyrolysis. BF γ exhibited better photoresponse properties than biochar (BC) and γ-Fe 2 O 3 . The removal efficiency of this system for 4-CP reached 96.41% under optimal conditions. This system showed high removal efficiency with a wide pH range (3.0–13.0) and under conditions of different organic pollutants . It also showed strong resistance to interference with co-existing inorganic ions and humic acid (HA). Electron paramagnetic resonance (EPR) and radical scavenging experiments revealed that the reactive oxygen species (ROS) in this system included SO 4 - ·, ·OH, ·O 2 - and 1 O 2 . The density functional theoretical (DFT) calculations further revealed the promotion of localized carbon doping in γ-Fe 2 O 3 on electron transfer and photoresponse, including C-O bond (d=1.29 Å), C-Fe bond (d=1.80 Å) and band gap value (E gap < 0.72 eV). This study provides new insights into constructing environmentally-friendly catalysts and the possibility of the solid waste recycling for other wetland plants.
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产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Rui Dang,Xiang-Rong Ma,Yun-Peng Zhao,Menjiao Ren,Wei Guo,Yu-Hong Kang,Yong Gao,Shiqing Bi,Wenwen Gao,Hua-Rui Hao,Rui Bai,Yu-Fei Wang,LongYan,Liguo Gao,Zhi-Fang Zhang,Ya-Jun Ma,Xian-Yong Wei
The construction of three-dimensional (3D) Ni 2+ -Al 3+ -LDH / γ-Fe 2 O 3 - Cd 2+ -Ni 2+ -Fe 3+ -layered double hydroxide (LDH) structures (S1–S6) with magnetic properties and different (γ-Fe 2 O 3 - Cd 2+ -Ni 2+ -Fe 3+ -LDH)/(Ni 2+ -Al 3+ -LDH) ratios were successfully prepared. The effects of these ratios in these 3D LDH constructions on physicochemical properties were investigated using XRD, SEM, VSM, UV–vis, and BET analyses. The specific surface area and band gap of these materials decreased with increased ratio, while the saturation magnetization increased. The synergistic combination of saturation magnetization, adsorption characteristics, and band gap of six sample types were evaluated. S3 samples were used in a multistage recycling treatment study of dye wastewater and fluoride ion (F − )-containing wastewater, effectively degrading methyl orange (MO) due to its high photocatalytic activity. After this, the memory effect of the calcined product (S3, 300 °C) significantly enhanced the migration and diffusion of F − , resulting in a F − adsorption capacity of 49.25 mg/g. The recycling properties of this composite material for photocatalytic degradation and adsorption capabilities for F − removal were evaluated, showing a reduction in efficiency of only 1 % and 8.6 % for degradation of MO and F − removal respectively, with no significant loss of efficiency after 10 cycles. Adsorption experiments and subsequent sample characterization showed that the F − adsorption mechanism of S3 involved ion exchange mechanism and sorption sites (interlayer, basal, edges and junction sites). The existence of oxygen vacancies and formation of S-scheme heterojunction between γ-Fe 2 O 3 -Cd 2+ -Ni 2+ -Fe 3+ -LDH and Ni 2+ -Al 3+ -LDH, resulted in the improvement of the photocatalytic activity. The results obtained in this study demonstrated that Ni 2+ -Al 3+ -LDH/γ-Fe 2 O 3 - Cd 2+ -Ni 2+ -Fe 3+ -LDH composites were a promising adsorbent for degradation of MO and F − removal in practical multilevel utilization due to its simple synthesis, low-cost, recyclability, and high removal capability.
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DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2017
·Vol. 27
·期 11
·1605313
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IF 12.124
Qianqian Zhang,Peiyuan Wang,Yun Ling,Xiaomin Li,Lixue Xia,Yongtai Yang,Xiaofeng Liu,Fan Zhang,Yaming Zhou
Developing a feasible way to prepare highly dispersed heterometallic nanoparticles incorporated in porous carbon composites is of significant importance for multifunctional materials. In this work, heterometallic γ-Fe 2 O 3 and GdPO 4 nanoparticles that are incorporated in ordered mesoporous carbon composites are facilely prepared by a one-pot in situ method using a Wells–Dawson-like cluster of [Fe 6 Gd 6 (μ 3 -O) 2 (CO 3 )(O 3 PPh) 6 (O 2 C t Bu) 18 ] ({Fe 6 Gd 6 P 6 } for short) as the precursor. It is verified that the γ-Fe 2 O 3 and GdPO 4 nanoparticles are highly dispersed and embedded into the carbon matrix with a particle size smaller than 5 nm, even when the carbon matrix is changed from 2D hexagonal P6mm to 3D body-centered cubic Im-3m symmetry. Additionally, a formation mechanism is proposed. Furthermore, dual-mode magnetic resonance (MR) imaging and drug carrier properties are evaluated by in vitro experiments, which show a satisfactory T 1 - and T 2 -weighted MR imaging effect with r 1 and r 2 relaxivity values of 2.7 and 183.7 mM −1 s −1 , respectively, and doxorubicin hydrochloride carrier amount of 102 mg g −1 , identifying a combined function for potential diagnostic and therapy.
研究领域:
材料科学
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纳米技术
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生物医学工程
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磁共振成像
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药物递送系统
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED POWDER TECHNOLOGY
·
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.
研究领域:
材料化学
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纳米科学
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无机化学
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功能材料
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化学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2011
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IF 3.723
Hui Wang,Yuming Huang
Prussian-blue (PB)-modified γ-Fe 2 O 3 magnetic nanoparticles (PBMNPs) were successfully synthesized based on electric interactions between negatively charged [Fe(CN) 6 ] 4− and positively charged γ-Fe 2 O 3 nanoparticles. The in situ PB coating was generated by the coordinating reaction between the adsorbed [Fe(CN) 6 ] 4− and the ferric ions on the surface of γ-Fe 2 O 3 NPs. The as-prepared PBMNPs were characterized by FT-IR, XRD, TEM, and used to remove organic pollutants from aqueous solution, namely, using methylene blue (MB) as model compound. The experimental results showed that the target compound could be removed efficiently from solution over a wide pH range from 3 to 10 in the presence of PBMNPs as peroxidase-like catalyst and H 2 O 2 as oxidant. Under optimal conditions, MB could be removed completely after 120 min of reaction at 298 K; the chemical oxygen demand (COD) removal efficiency and the total organic carbon (TOC) abatement efficiency were 53.6% and 35%, respectively. Furthermore, the PBMNPs catalysts showed high magnetization, temperature tolerance, long-term storage and operational stability, and they could be readily separated from solution by applying an external magnetic field. Finally, a possible reaction mechanism for MB degradation was also discussed.
研究领域:
环境科学
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纳米材料学
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催化化学
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水处理技术
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环境功能材料
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS CHEMISTRY
·
2011
·Vol. 21
·期 39
·15741-15751
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IF 5.101
Jianming Pan,Wei Hu,Xiaohui Dai,Wei Guan,Xiaohua Zou,Xue Wang,Pengwei Huo,Yongsheng Yan
Magnetic composites (MCs) were achieved via coating a chitosan layer containing γ-Fe2O3 nanoparticles onto the surface of aldehyde-functionalized fly-ash-cenospheres. Based on these MCs, the magnetic molecularly imprinted polymers (MMIPs) were further synthesized and characterized, and used to selectively recognise bisphenol A (BPA) molecules. Owing to the intrinsic advantages of cross-linked chitosan, magnetic γ-Fe2O3 nanoparticles and spherical FACs, the results demonstrated that these spherical shaped MMIPs particles had magnetic sensitivity (Ms = 2.221 emu g−1) and magnetic stability (especially over the pH range of 6.0–12). Batch mode adsorption studies were carried out to investigate the specific adsorption equilibrium, kinetics and selective recognition. The Langmuir isotherm model was fitted well to the equilibrium data of the MMIPs, and the monolayer adsorption capacity of the MMIPs was 135.1 mg g−1 at 298 K. The kinetic properties of the MMIPs were well described by the pseudo-second-order equation, indicating the chemical process could be the rate-limiting step in the adsorption process for BPA. Selective recognition experiments demonstrated the high affinity and selectivity of MMIPs towards BPA over competitive phenolic compounds. The molecular interaction between BPA and methacrylic acid (MAA) was investigated by the 1H-NMR spectrum. Hydrogen bonding was proved to be mainly responsible for the recognition mechanism, and the specific recognition effect may be based on the distinct size, structure and functional group of the template molecules.
研究领域:
材料科学
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环境科学
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分析化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2019
·
IF 4.175
Huan Wang,Zicheng Xiao,Zhifeng Yu,Yuntian Ma,Pingfan Wu,Fumin Xue,Wei Guo,Wangda Lu,Xinxin Jiao,Peng Jiang,Minghui Liang
To develop iron-based materials for energy storage is an important issue because of their low cost, abundant storage and high theoretical specific capacitances. Fe(OH) 3 colloids stabilized by FeCl 3 are used as the precursor to fabricate with carbon from glucose and graphene oxide (GO) to prepare superparamagnetic iron oxide/carbon/rGO (reduced graphene oxide) composite for enhanced energy storage performance. Glucose or graphene oxide cannot avoid the aggregation of iron oxides when they are used separately; however, the simultaneous addition of glucose and graphene oxide can supress the aggregation of iron oxide nanoparticles , which is beneficial for energy storage. The characterization results of Fe 2 O 3 -based composites, including XRD , TEM and XPS , reveal that iron oxide nanocrystals in the composites are γ-Fe 2 O 3 . The simultaneous utilization of GO and glucose leads to higher saturation magnetizations of iron oxide than GO or glucose does, and the saturation magnetization of iron oxide in the iron oxide/carbon/rGO composite can be up to 83 emu g −1 . More importantly, the iron oxide/carbon/rGO composites have much higher energy storage performance than that of iron oxide/carbon or iron oxide/rGO samples. The specific capacitance of the composites can reach 400 F g −1 and the retention can remain 92% after 2500 cycles.
研究领域:
材料科学
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能源存储
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纳米技术
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）