Key Laboratory of Inorganic Nanomaterial of Hebei Province

Shijiazhuang, China

Key Laboratory of Inorganic Nanomaterial of Hebei Province

Shijiazhuang, China
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Yang X.,Hebei Normal University | Zhu M.,Hebei Medical University | Kang F.,Hebei Normal University | Cao S.,Hebei Normal University | And 6 more authors.
Journal of Crystal Growth | Year: 2015

Trigonal antiprismatic jarosite-type compounds were prepared by a simple, rapid and template-free synthetic route. The as-prepared samples were characterized by various techniques. The results indicate that the formation of jarosite-type particle with trigonal antiprismatic morphology strongly depends on pH of the system. Trace of Fe2+ ions enter jarosite-type crystal and play a role in the development of the trigonal antiprismatic morphology. Based on the characterization data and experimental observation, the possible formation mechanism was clarified. Fe3+ ions firstly transformed to schwertmannite in the presence of SO42- ions. When Na+ (K+ or NH4+) ions coexist in the system, schwertmannite is preferable to transforming jarosite-type compounds instead of other iron oxides. © 2015 Published by Elsevier B.V.


Zhang X.,Shanxi Institute of Coal CAS Chemistry | Zhang X.,University of Chinese Academy of Sciences | Zhang X.,Hebei Normal University | Chen Y.,Hebei Normal University | And 5 more authors.
Journal of Nanoscience and Nanotechnology | Year: 2014

In this paper, a simple and efficient route had been developed for the synthesis of hierarchical α-Fe2O3hollow microspheres with open pores on the shells. All chemicals used were low-cost compounds and environmentally benign. The as-prepared samples were characterized by field emission scanning electron microscope (FESEM), X-ray diffraction (XRD) and Brunauer-Emmett-Teller (BET) gas sorptometry. The results showed that the chelating ligand SSA and the initial pH value of the solution played important roles in the morphological control of the α-Fe2O3nanostructures. A possible formation mechanism was described based on the experimental results. The obtained α-Fe2O3hollow spheres exhibited an excellent adsorption capacity for Cr(VI) ions because of their high surface area and a good ability to preserve the accessible surface. Copyright © 2014 American Scientific Publishers All rights reserved.


Zhang X.,Hebei Normal University | Zhang X.,Shanxi Institute of Coal CAS Chemistry | Chen Y.,Hebei Normal University | Zhao N.,Shanxi Institute of Coal CAS Chemistry | And 4 more authors.
RSC Advances | Year: 2014

Hierarchical citrate modified ferrihydrite microstructures (Fh1) with flower-like morphologies were successfully synthesized via a simple aqueous solution route without the addition of any organic solvent or surfactant. The obtained products were characterized by field emission scanning electron microscopy (FESEM), high resolution transmission electron microscopy (HRTEM), X-ray diffraction (XRD), BET analyses, Fourier-transform IR spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS). The prepared citrate modified ferrihydrite microstructures (Fh1) exhibited superior adsorption abilities for removal of methylene blue (MB) and Cr(vi) ions from aqueous solution. In addition, these citrate modified ferrihydrite microstructures also exhibited high activity to produce hydroxyl radicals through catalytic decomposition of H2O2 and could degrade highly concentrated MB solution at neutral pH. The results indicate that citrate modified ferrihydrite microstructures are very promising adsorbents and (photo-) Fenton-like catalysts for the treatment of pollutants. This journal is © the Partner Organisations 2014.


Zhang X.,Shanxi Institute of Coal CAS Chemistry | Zhang X.,University of Chinese Academy of Sciences | Zhang X.,Hebei Normal University | Chen Y.,Hebei Normal University | And 5 more authors.
Journal of Alloys and Compounds | Year: 2013

In this paper, a simple and efficient route had been developed for morphology-controlled synthesis of hierarchical α-Fe2O 3 superstructures assembled by nanocrystallites. All chemicals used were low-cost compounds and environmentally benign. The morphologies and structures of the α-Fe2O3 crystals were characterized by field emission scanning electron microscope (FESEM), X-ray diffraction (XRD) and Fourier-transform IR spectroscopy (FTIR). The results showed that different shapes of hierarchical α-Fe2O3 nanostructures such as peanuts-like, capsule-like, cantaloupe-like and almond-shaped could be prepared by simply varying the concentration of silicate anions and other inorganic reagents. The as-prepared α-Fe 2O3 architectures were composed of nanorods or nanosheets at different synthesis temperature. The possible formation mechanism was described based on the experimental results. Magnetic hysteresis measurements revealed the as-prepared superstructures displayed ferromagnetic behavior with higher remanence and coercivity at room temperature, which was attributed to the superstructure or the shape anisotropy of the samples. © 2012 Elsevier B.V. All rights reserved.


Chen R.,Hebei Normal University | Chen R.,Key Laboratory of Inorganic Nanomaterial of Hebei Province | Zhang X.,Hebei Normal University | Liu H.,Hebei Normal University | And 2 more authors.
RSC Advances | Year: 2015

High- and low-crystalline goethite (α-FeOOH) were obtained via air oxidation of Fe(OH)2. Rhodamine B (RhB) was selected as a model pollutant, and the photocatalytic activity of the α-FeOOH/oxalate system under light irradiation was evaluated. The crystal structure, morphology, and specific surface area of the prepared α-FeOOH samples were determined by X-ray diffraction (XRD), transmission electron microscopy (TEM), and Brunauer-Emmett-Teller (BET), respectively. The adsorption behavior of α-FeOOH was determined using the Langmuir model. The effects of initial pH value, initial concentration of oxalic acid, and light intensity on RhB photodegradation were investigated in the α-FeOOH/oxalate suspension. In contrast to high-crystalline α-FeOOH, low-crystalline α-FeOOH with a high specific surface shows higher adsorption and photocatalytic activity toward RhB photodegradation by a photo-Fenton-like reaction. A possible mechanism for RhB degradation was also suggested. © 2015 Royal Society of Chemistry.


Ni C.,Hebei Normal University | Liu S.,Hebei Normal University | Cui L.,Hebei Normal University | Han Z.,Hebei Normal University | And 5 more authors.
RSC Advances | Year: 2016

Metal (hydr)oxides are ubiquitous in subsurface sediments. Therefore, investigating the adsorption and desorption of Cr(vi) on ferrihydrite (Fh) and Al-substituted ferrihydrite (FAh) is highly important in understanding the fate and transport of heavy metals in subsediments at their initial sources. In the present paper, both Fh and FAh were prepared on the basis of the abundance of Al and Fe elements in the surface environment. The adsorption of Cr(vi) onto Fh and FAh samples was also studied. The influence of pH, initial concentration, temperature, and some familiar anions such as SO4 2-, H2PO4 -, C2O4 2-, CO3 2-, and F- on the adsorption of Cr(vi) onto Fh was studied by batch techniques. Results show that FAh exhibited a higher adsorption capacity for Cr(vi) than did Fh. The adsorption capacity for Cr(vi) was found to be 12.97 and 39.79 mg g-1 for Fh and FAh, respectively. The adsorption kinetics in the two systems followed a pseudo-second-order equation and the Langmuir isotherm model. The adsorbed Cr(vi) species mainly existed in the forms ∗Fe(wk)-OHCrO4 2- and ∗Fe(wk)CrO4 - on the sample surfaces. Thermodynamic parameters, including the Gibbs free energy (ΔG°), enthalpy (ΔH°), and entropy (ΔS°), indicated that the adsorption of Cr(vi) ions onto Fh and FAh was feasible, spontaneous, and endothermic at the temperature range 20-50 °C. Thus, both Fh and FAh can be used as effective, low-cost adsorbents for the treatment of industrial wastewaters contaminated with Cr(vi) ions. © 2016 The Royal Society of Chemistry.


Cao S.,Hebei Normal University | Kang F.,Hebei Normal University | Li P.,Hebei Normal University | Li P.,Key Laboratory of Inorganic Nanomaterial of Hebei Province | And 6 more authors.
RSC Advances | Year: 2015

Fusiform-like maghemite particles were prepared through a distinct two-step transformation from Fe(ii) to γ-FeOOH and then to γ-Fe2O3 by precipitation and calcination respectively. The structure and property of the as-prepared sample were characterized by XRD, SEM, XPS, UV-vis and FTIR. The degradation of Acid Blue 74 by γ-Fe2O3 was investigated under visible light irradiation. 1H NMR, TOC, UV-vis, direct infusion-ESI-(-)MS and FTIR spectroscopic techniques provide an insight into the nature of the degradation products. A more complete degradation mechanism of Acid Blue 74 on γ-Fe2O3 was presented. The results indicate the total degradation rate is close to 100% for a 100 mg L-1 Acid Blue 74 solution. Among them, about 60% was completely mineralized and the other 40% was degraded to aliphatic acids. The magnetic γ-Fe2O3 could be conveniently recovered by applying a magnet and recycled. The γ-Fe2O3 retained 100% degradation capacity for Acid Blue 74 after 6 cycles. This journal is © The Royal Society of Chemistry.


Zhao L.,Hebei Normal University | Lu B.,Hebei Normal University | Liu H.,Hebei Normal University | Liu H.,Key Laboratory of Inorganic Nanomaterial of Hebei Province | And 2 more authors.
Huagong Xuebao/CIESC Journal | Year: 2011

Uniform pseudocube nano-iron oxide red (hematite)particles was prepared in the liquid phase by using δ-FeOOH as seed and iron as raw material at low temperature. The effects of such factors as initial pH of reaction, concentration of catalyst, reaction time on the preparation of these hematite particles were investigated. The product was characterized by XRD, IR, FESEM. The results showed that pure pseudocube hematite particles could be prepared under the experimental conditions of solution initial pH 7, β=0.09(β=[Fe 2+]/[δ-FeOOH]), air oxidation temperature and time of 100°C and 48 h respectively. The product crystallized integrally with particle diameter 90-100 nm, and its color was brightly red. This is a new method to prepare high-purity nano-iron oxide red with the characteristics of simple operation, non-pollution and low cost. © All Rights Reserved.


Liu S.,Hebei Normal University | Liu S.,Key Laboratory of Inorganic Nanomaterial of Hebei Province | Ni C.,Hebei Normal University | Ni C.,Key Laboratory of Inorganic Nanomaterial of Hebei Province | And 10 more authors.
RSC Advances | Year: 2016

The adsorption and degradation of Mordant Yellow 10 (MY10), Eriochrome Black T (EBT) and Phenol Red (PR) in a ferrihydrite (Fh)/H2O2/visible light system were investigated. The affinity of Fh to the three dyes was evaluated based on the Langmuir model parameters, dimensionless separation factor RL, and adsorption-desorption isotherms. The effects of the affinity between the dyes and Fh on the degradation rate of the dyes were studied. The results show that the saturated adsorption capacities of the three dyes on Fh were 206.61, 126.26, and 73.26 mg g-1 for EBT, MY10, and PR, respectively. The degradation rate of EBT was much larger than those of MY10 and PR, but the difference between the degradation rates of MY10 and PR were small. The affinity between the dyes and Fh followed the order of MY10 蠑 EBT > PR. Both strong and weak affinities between the dyes and Fh were unfavorable for their degradation. Only moderate affinity allowed the adsorption-degradation-desorption process of dyes to occur continuously, which resulted in a high degradation rate. When NaNO3 solution was added into the MY10 system, the affinity between MY10 and Fh weakened, and the degradation rate of MY10 increased. © The Royal Society of Chemistry 2016.


Cao S.,Hebei Normal University | Kang F.,Hebei Normal University | Yang X.,Hebei Normal University | Zhen Z.,Hebei Normal University | And 6 more authors.
Journal of Solid State Chemistry | Year: 2015

A series of Al-substituted hematite was prepared. The structures and properties of as-prepared samples were characterized by various techniques. The magnetic property of the samples was determined and the adsorption of three dyes Acid Blue 74, Methylene Blue and Phenol Red onto the samples was investigated. The results showed that Al incorporation into the crystal structure of hematite occurs via isomorphous ionic substitution of Al for Fe. With increasing Al content, the particle size of samples decreases, the magnetization increases and the remanent magnetization remains unchanged. The coercivity of the samples increases with Al substitution up to nAl/nFe 0.03, and then decreases as Al content further increases. Compared with Al-free hematite, Al-substituted samples exhibit better adsorption ability to all of the three dyes. The adsorption rates of the three dyes on the surface of Al substituted samples depend on the structure of dye, pH and Al content in hematite. © 2015 Elsevier Inc.

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