摘要 ：

一种基于Fe2+和Fe3+循环驱动的污水生物脱氮方法，属于污水生物处理领域。本发明以城市污水处理厂二沉池活性污泥为种泥成功富集了厌氧铁氨氧化和硝酸盐依赖型Fe2+氧化污泥，实现了二者耦合一体化脱氮。仅在反应器运行第一天投加1g/L Fe2O3，通过Fe2+和Fe3+循环实现了长期稳定高效脱氮，氨氮和总氮去除率最高达100％和92.45％。NH4+‑N在厌氧铁氨氧化作用下生成N2和NO3‑‑N，Fe3+被还原为Fe2+。生成的Fe2+通过两种途径氧化为Fe3+，一种途径是微生物介导的硝酸盐依赖型Fe2+氧化，另一种途径是被进水溶解氧化学氧化为Fe3+。本发明无需去氧、无需曝气和外加有机物，且利用厌氧铁氨氧化和硝酸盐依赖型Fe2+氧化分别消耗H+和产生H+的特性，使出水pH值稳定在7‑8，实现高效稳定脱氮。

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As(V) in aquatic environment has posed a great threat to human beings due to its high mobility and toxicity. Developing economical and efficient adsorbents is vital for the removal of arsenic contamination in wastewater. We herein report the synthesis of FeOOH-MnO2/Sepiolite and Fe2O3-MnO2/Diatomite using the hydrothermal treatment method at 180 degrees C for 12 h with KMnO4, MnCl2, and FeCl3 as metal source and urea as precipitating agent. The FeOOH-MnO2 or Fe2O3-MnO2 composite was in situ grown on the sepiolite or diatomite support, resulting in a significant enhancement in surface area (which was 77.4 and 83.0 m2/g for the supported FeOOHMnO2 and Fe2O3-MnO2 samples, respectively). FeOOH-MnO2/Sepiolite and Fe2O3-MnO2/Diatomite could effectively remove As(V), with the maximal As(V) adsorption capacities at 25 degrees C and pH = 7 being 124.3 and 148.2 mg/g, respectively. Furthermore, both samples exhibited good recycle As(V) adsorption performance. In addition. As(V) adsorption mechanisms of the samples were also discussed. The As(V) adsorption on FeOOHMnO2/Sepiolite and Fe2O3-MnO2/Diatomite obeyed the Freundlich and Langmuir isothermal adsorption models, respectively. Considering their simple synthesis processes and excellent adsorption performance, we are sure that FeOOH-MnO2/Sepiolite and Fe2O3-MnO2/Diatomite are promising adsorbents for arsenic removal from wastewater.

关键词 ：

Adsorption mechanism Chemical modification Clay minerals As(V) removal Adsorbent

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Designing highly efficient photocatalysts is significantly important to degrade the harmful pollutions in water. In this study, photocatalyst of Fe3O4-ED-rGO with dissolved HPV was successfully prepared and electron microscopy characterization revealed that large number of single tungsten/vanadium atom oxide (ST/VAO) was homogeneously deposited on Fe3O4 nanoparticles in SMAO-MrGO-ED sample and occupied the bivalent Fe2+ sites. Meanwhile, phase analysis confirmed that the Fe3O4 nanocomposites were mostly conversed from the reducted Fe2O3 by the hydrolysis of rGO-ED-HPV. Such a highly dispersed monatomic adsorption on the bivalent Fe2+ of polycrystalline SMAO-MrGO-ED nanocomposite not only benefits for the visible light absorption from 2.7 eV to 2.10 eV, but also offers abundantly active sites to get the highest activity of 98.43% and 98.12% for ciprofloxacin (CF) and ibuprofen (IBF) photodegradation, respectively. All these discoveries give us a new insight to design the photocatalysts with high photodegradation efficiency, low cost, short reaction time and good reusability.

关键词 ：

Ibuprofen Magnetic nanocomposite Single metal atom oxide Photodegradation Ciprofloxacin

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Bisphenol-A (BPA) has been widely used as a plasticizer in modern society and persistently released into aquatic environments. Herein, a novel Fe2O3-graphene oxide (GO) hybrid containing 22.8% of GO was prepared to enhance BPA removal from contaminated water and wastewater. This hybrid material afforded outstanding BPA adsorption capacities of 3293.9 mg g−1 under optimized conditions, which led to 1.9 times and 1.2 times of BPA removal as compared to GO and reduced GO (rGO), respectively. In addition, Fe2O3-GO showed higher thermal stability, greater solid/liquid separation performance, and better anti-fouling performance. Moreover, the coexistence of natural or effluent organic matter caused 6.7–16.8% decline in BPA adsorption capacity of Fe2O3-GO, which was lower than those of GO and rGO (11.8–39.4%). Further characterization experiments revealed that BPA removal by Fe2O3-GO was enhanced because of the formation of Lewis acid-base (AB) interactions between the active sites on Fe2O3 (Lewis base) and BPA anions (Lewis acid). The existence of the AB interaction is beneficial for practical application considering the low environmental concentrations of BPA in water and wastewater. Besides, the distinctly lowered GO content of the hybrid saved 77.2% of the adsorbent cost. In conclusion, this study demonstrated the potential of Fe2O3-GO as a novel material for the treatment of BPA-contaminated water and wastewater. © 2020 Elsevier Ltd

关键词 ：

Effluents Graphene Hematite Hybrid materials Phenols Reduced Graphene Oxide Wastewater treatment Water pollution Water treatment

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A novel core-shell magnetic nanoparticle was synthesized through heterogeneous nucleation technique and utilized to remove As(V) from water. Both the magnetic core and the coating material, amorphous FeOOH shell, were prepared with iron-containing water treatment residuals (WTRs), also called iron sludge. The bare magnetic nanoparticles (MNPs) and coatedmagnetic nanoparticles (c-MNPs) were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM), Brunauer-Emmett-Teller analysis (BET), vibrating sample magnetometer (VSM) and Fourier transform infrared spectroscopy (FTIR). The c-MNPs, mainly consisting of maghemite (gamma-Fe2O3) as the magnetic core and amorphous FeOOH as the coating material, could be easily separated from water through a hand-held magnet, the saturation magnetization of which is 36.4 emu/g. Freundlich adsorption isotherm model could better described the As(V) adsorption behavior of c-MNPs than Langmuir model, and kinetic data could be described well by the pseudo-second order model. The maximum As(V) adsorption capacity of c-MNPs (26.05 mg/g) was more than twice that of MNPs (12.74 mg/g). At 25 degrees C, 0.2 g/L of the c-MNPs could reduce the As(V) from 400 mu g/L to below the maximum contaminant level (MCL) of 10 mu g/L over a broad pH ranging from 4 to 8. The c-MNPs still exhibited effective adsorption in the presence of co-existing anions including nitrate, chloride, carbonate, and sulfate, whereas, silicate and phosphate had a negative influence on the As(V) adsorption. Throughout five consecutive cycles, the adsorbents could still maintain high As(V) adsorption capacity. (C) 2020 Elsevier B.V. All rights reserved.

关键词 ：

Iron sludge Maghemite Magnetic adsorbent

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The purification efficiency of auto-exhaust carbon particles in the catalytic aftertreatment system of vehicle exhaust is strongly dependent on the interface nanostructure between the noble metal component and oxide supports. Herein, we have elaborately synthesized the catalysts (Pt/Fe2O3-R) of Pt nanoparticles decorated on the hexagonal bipyramid alpha-Fe2O3 nanocrystals with co-exposed twelve {113} and six {104} facets. The area ratios (R) of co-exposed {113} to {104} facets in alpha-Fe2O3 nanocrystals were adjusted by the fluoride ion concentration in the hydrothermal method. The strong Pt-Fe2O3{113} facet interaction boosts the formation of coordination unsaturated ferric sites for enhancing adsorption/activation of O-2 and NO. Pt/Fe2O3-R catalysts exhibited the Fe2O3{113} facet-dependent performance during catalytic purification of soot particles in the presence of H2O. Among the catalysts, the Pt/Fe2O3-19 catalyst exhibits the highest catalytic activities (T-50 = 365 degrees C, TOF = 0.13 h(-1)), the lowest apparent activation energy (69 kJ mol(-1)), and excellent catalytic stability during soot purification. Combined with the results of characterizations and density functional theory calculations, the catalytic mechanism is proposed: the active sites located at the Pt-Fe2O3{113} interface can boost the key step of NO oxidation to NO2. The crystal facet engineering is an effective strategy to obtain efficient catalysts for soot purification in practical applications.

关键词 ：

crystal facet-dependent activity soot purification SMSI Pt alpha-Fe2O3

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In this work, Fe2O3 supported single atom Pt (x Pt1/Fe2O3, x = 0.25 and 0.5 wt%) catalysts (SACs) are synthesized via a novel and simple impregnation-pyrolysis method. HAADF-STEM images show that Pt is atomically dispersed on the surface of Fe2O3. All samples exhibit good light-thermal conversion efficiency, which can increase the surface temperature of catalysts to 210 degrees C. The 0.5 Pt1/Fe2O3 exhibits the best photothermal catalytic performance (the toluene conversion and CO2 yield are 95 % and 87 %, respectively) for toluene oxidation under the irradiation of simulated sunlight with light intensity of 720 mW/cm2, which is attributed to its good lightthermal conversion efficiency and low temperature reducibility. The Vis-IR light plays a critical role in the photothermal catalytic oxidation of toluene in the whole solar spectrum. Furthermore, the possible photothermal catalytic reaction pathway of toluene oxidation is proposed based on the TD-GC/MS and in-situ DRIFTS experiments.

关键词 ：

Light-driven photothermal catalysis Catalytic oxidation mechanism Single atom Pt catalyst Volatile organic compounds Toluene oxidation

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Recently, rising distress over ecological pollution owing to water contamination by coloring effluents primarily due to dyes is of growing concern. The development of semiconductor/magnetic oxide-based nanomaterials has verified to be a potent remediation means for water pollution. In the present article, the fabrication of nanocomposites was carried out by the facile hydrothermal method. The ZnO and ZnSe nanoparticles were in situ formed on the α-Fe2O3 layer, thereby forming a heterojunction. The prepared α-Fe2O3/ZnSe nanocomposite possessed a degradation of 98.9% for a Congo red aqueous solution of 100 ppm. The α-Fe2O3/ZnO nanocomposite showed only 26% degradation of 100 ppm dye solution depicting a poor photocatalytic performance. This is attributed to the formation of recombination-enhanced configuration (type-I heterostructure) in the α-Fe2O3/ZnO nanocomposite (NC). In contrast, α-Fe2O3/ZnSe NC accomplished a higher and enhanced photocatalytic response. The key rationale for elevated photocatalytic response is the establishment of a recombination-free configuration (type-II heterostructure). Thus, α-Fe2O3/ZnSe NC known as one of outstanding nanoparticle-nanocomposite photocatalysts was synthesized under mild conditions exclusive of some multifaceted post-treatment, for dye abatement process.

关键词 ：

ZnSe α-Fe2O3 Mechanism ZnO Hydrothermal process Textile wastewater treatment Alignment of energy levels Photocatalysis

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As fouling and corrosion often occur in the heat exchanger simultaneously, it is difficult to research the two problems separately. In this work, the adsorption behaviour of Fe2O3/Fe, calcite and aragonite on the corroded surface were studied by molecular dynamics and the corrosion-fouling experiment. The results prove that the parameters of the Fe(0 0 1) surface can be affected by the Fe2O3 corrosion. The interaction energy between the calcium carbonate and substrate shows that both Fe and Fe2O3 surfaces have certain adsorption effect on calcium carbonate crystallisation fouling. In addition, the adsorption effect of Fe2O3(0 0 1) on calcite during the fouling induction period is three times than that on the Fe(0 0 1) surface. Although the aragonite is prone to adhering to the non-corroded substrate, the binding ability between aragonite and substrate is weaker than that between calcite and substrate. Moreover, according to the corrosion-fouling experiment, the precipitate on the surface of the non-corroded is mainly calcite-phase calcium carbonate mingled with the acicular aragonite-phase calcium carbonate. The mass gain of fouling increases with the increasing corrosion of the substrate. The work provides evidence that the fouling nucleation of the calcium carbonate can be influenced by the corroded surface.

关键词 ：

&#945 calcite -fe(2)O(3) adsorption process fouling molecular dynamics

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The NiO and Fe2O3 powders were mixed by the high-energy ball-milling, followed by a sintering of the mixture at 1340 degrees C for 0.5 h. XRD, SEM, DSC, and size measurements were preformed to study the microstructure evolution in the high-energy ball-milled mixture and the sintered ones, as well. It showed that the high-energy ball-milling processes resulted in a severe lattice distortion in the powder of Fe2O3, but only a slight lattice distortion in NiO. Meanwhile, a solid solution of iron atoms into the NiO lattice was also detected in the milling process. It was also found that the solubility of the iron atoms into the NiO lattice delayed the synthesizing reaction in the following sintering process.

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