Engineering Research Center for Cleaner Production of Textile Printing and Dyeing

Wuhan, China

Engineering Research Center for Cleaner Production of Textile Printing and Dyeing

Wuhan, China

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Xu Z.,Wuhan Textile University | Lu J.,Wuhan Textile University | Liu Q.,Wuhan Textile University | Duan L.,Engineering Research Center for Cleaner Production of Textile Printing and Dyeing | And 5 more authors.
RSC Advances | Year: 2015

New metallic cobalt loaded magnetic nanocomposites (Fe3O4@C/Co) were prepared by calcination and in situ reduction of the Co2+-impregnated magnetic carbon nanoparticles of Fe3O4@C at 900 °C under a nitrogen atmosphere. Fourier transform infrared spectroscopy (FT-IR), powder X-ray diffraction (XRD), vibrating sample magnetometry, transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS) were employed to characterize the properties of the composites and the loading of metallic Co0 in the material was clarified. The catalytic properties of the nanocomposites Fe3O4@C/Co in activating peroxymonosulfate (PMS) for decolorization of Acid Orange II (AO II) dye in aqueous solution were investigated. Fe3O4@C/Co nanocomposites exhibited high activity in PMS activation for AO II decolorization. Complete decolorization of AO II solution could be achieved in 20 min within near neutral pH range (pH 6.4-8.5), while a complete decolorization occurred in 40 min for the as-prepared solution without pH adjustment (pH 4.05). The effects of several parameters including pH, catalyst load, PMS concentration and reaction temperature on the catalytic activity were also investigated. Sulfate free radicals activated from PMS were proposed to be the dominant active species in the "Fe3O4@C/Co + PMS" system for AO II decolorization. The catalytic and decolorization mechanism was suggested. The catalyst Fe3O4@C/Co could be recycled easily by a magnet with good reusability. This study provides a promising method for the activation of "green" oxidant, PMS, by the new magnetic nanocomposites for environmental remediation and oxidation catalysis. © The Royal Society of Chemistry 2015.


Xu Z.,Wuhan Textile University | Lu J.,Wuhan Textile University | Liu Q.,Wuhan Textile University | Duan L.,Engineering Research Center for Cleaner Production of Textile Printing and Dyeing | And 5 more authors.
RSC Advances | Year: 2015

New metallic cobalt loaded magnetic nanocomposites (Fe3O4@C/Co) were prepared by calcination and in situ reduction of the Co2+-impregnated magnetic carbon nanoparticles of Fe3O4@C at 900 °C under a nitrogen atmosphere. Fourier transform infrared spectroscopy (FT-IR), powder X-ray diffraction (XRD), vibrating sample magnetometry, transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS) were employed to characterize the properties of the composites and the loading of metallic Co0 in the material was clarified. The catalytic properties of the nanocomposites Fe3O4@C/Co in activating peroxymonosulfate (PMS) for decolorization of Acid Orange II (AO II) dye in aqueous solution were investigated. Fe3O4@C/Co nanocomposites exhibited high activity in PMS activation for AO II decolorization. Complete decolorization of AO II solution could be achieved in 20 min within near neutral pH range (pH 6.4-8.5), while a complete decolorization occurred in 40 min for the as-prepared solution without pH adjustment (pH 4.05). The effects of several parameters including pH, catalyst load, PMS concentration and reaction temperature on the catalytic activity were also investigated. Sulfate free radicals activated from PMS were proposed to be the dominant active species in the "Fe3O4@C/Co + PMS" system for AO II decolorization. The catalytic and decolorization mechanism was suggested. The catalyst Fe3O4@C/Co could be recycled easily by a magnet with good reusability. This study provides a promising method for the activation of "green" oxidant, PMS, by the new magnetic nanocomposites for environmental remediation and oxidation catalysis. This journal is © The Royal Society of Chemistry 2015.


Wang Q.,Wuhan Textile University | Wang Q.,Engineering Research Center for Cleaner Production of Textile Printing and Dyeing | Liu Y.,Wuhan Textile University | Gao W.,Wuhan Textile University | And 5 more authors.
Transition Metal Chemistry | Year: 2014

A new Schiff base complex [Ni(H2L1)(NO 3)](NO3) (1) (H2L1 = 3-[N,N-bis-2-(5-bromo-3-(morpholinomethyl) salicylideneamino) ethyl amine]) was synthesized from reaction of the ditopic ligand H2L1 with Ni(NO3)2 in anhydrous MeOH. Complex 1 is stable in the solid state, but prone to hydrolysis. Recrystallization of 1 from wet MeOH led to the isolation of a novel unsymmetrical complex [Ni(HL2)(NO 3)](NO3) (2) (HL2 = 2-[(2-(2-aminoethylamino) ethylimino) ethyl)-5-bromo-3-(morpholino methyl) salicylidene amine]). X-ray single-crystal analysis of complex 2 showed that complex 1 had undergone partial decomposition of one imine bond. In contrast, the Schiff base complex [Ni(HL3)](NO3) (3) (H2L3 = N,N-bis(5-methyl-salicylidene) diethylenetriamine) was stable in wet methanol, and the single-crystal structure of 3 showed that the Ni(II) center was coordinated in an unsymmetrical square planar geometry. Density functional theory calculations were performed in order to obtain a geometry-optimized model of complex 1, in which the Ni(II) center was coordinated in a similar manner as that in complex 3. The thermodynamic parameters were calculated, in order to rationalize the difference in hydrolytic reactivity between complexes 1 and 3. © 2014 Springer International Publishing Switzerland.


Xu Z.,Wuhan Textile University | Li W.,Wuhan Textile University | Xiong Z.,Engineering Research Center for Cleaner Production of Textile Printing and Dyeing | Fang J.,Wuhan Textile University | And 4 more authors.
Desalination and Water Treatment | Year: 2015

The amino-functionalized magnetic nanoadsorbent Fe3O4@SiO2-NH2 was prepared and it was characterized by X-ray powder diffraction, transmission electron microscopy, Fourier transform infrared (FT-IR) spectroscopy, and thermogravimetric analysis (TGA). The adsorption of anionic dyes including Acid Orange II (AO II) and Reactive Brilliant Red X-3B (X-3B) onto Fe3O4@SiO2-NH2 was investigated. The results showed that Fe3O4@SiO2-NH2 exhibited efficient adsorption for these anionic dyes under acidic conditions, and it was proposed to proceed via electrostatic attraction and hydrogen bonding between the positively charged protonated amino groups (–(Formula presented.)) on the adsorbent surface and the negatively charged sulfonate groups (–(Formula presented.)) of the dyes. The mechanism was supported by density functional theory (DFT) calculations. The adsorption kinetics for AO II and X-3B on Fe3O4@SiO2-NH2 followed the pseudo-second-order kinetic model, and the adsorption equilibrium data fitted well with Langmuir isotherm model. The maximum adsorption capacities for AO II and X-3B at pH 2 under room temperature were 132.2 and 233.1 mg g−1, respectively. Desorption of dyes and regeneration of the adsorbent were carried out using aqueous solution at pH 10. The adsorbent Fe3O4@SiO2-NH2 could be easily recovered by external magnet and it exhibited good recyclability and reusability for three cycles use. © 2015 Balaban Desalination Publications. All rights reserved.


Wang Q.,Wuhan Textile University | Wang Q.,Engineering Research Center for Cleaner Production of Textile Printing and Dyeing | Gao W.,Wuhan Textile University | Liu Y.,Wuhan Textile University | And 6 more authors.
Chemical Engineering Journal | Year: 2014

A novel silica gel based absorbent SG-H2L1, capable of simultaneous adsorption of cations and anions from aqueous solution, was prepared by immobilization of a ditopic zwitterionic Schiff base ligand H2L1 onto a modified silica gel. The functionalized silica gels were characterized by Fourier transform infrared spectroscopy, elemental analysis, thermogravimetric analysis and porous structure analysis. The results showed a degree of functionalization of 0.32mmol H2L1 per gram of SG-H2L1. The effect of pH, contact time and initial Cu(II) and SO4 2- concentration parameters on the simultaneous adsorption of Cu(II) and SO4 2- ions were investigated. The adsorption was fast and the effective pH range for simultaneous adsorption of Cu(II) and SO4 2- was neutral region. The adsorption study showed that SG-H2L1 had good adsorption efficiency for Cu(II) and SO4 2-, and the maximum adsorption capacity for Cu(II) and SO4 2-, respectively, was the same of 0.65mmolg-1 at 25°C. Langmuir and Freundlich isotherm models were employed to analyze the experimental data, and the Langmuir model fitted better for both Cu(II) and SO4 2-. Due to the zwitterionic feature, desorption and regeneration of the absorbent was readily realized by adjusting the pH of the regenerating media with diluted H2SO4 (0.5molL-1) and ammonia solution (pH=10), respectively. The new type absorbent SG-H2L1 exhibited good recyclability and reusability for 5 cycles use without deterioration in its functionality. Therefore, the adsorbent can be used effectively for efficient and simultaneous adsorption of Cu(II) and SO4 2- from waste water. The mechanism for simultaneous adsorption of cation and anions on SG-H2L1 was also discussed. This study provides a strategy for the development of new absorbents for simultaneous adsorption of hazardous metal ions and anions from waste water effluents. © 2014 Elsevier B.V.

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