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Wu S.,Key Laboratory of Jiangxi Province for Ecological Diagnosis Remediation and Pollution Control | Wu S.,Nanchang Hangkong University | Hu W.,Key Laboratory of Jiangxi Province for Ecological Diagnosis Remediation and Pollution Control | Hu W.,Nanchang Hangkong University | And 2 more authors.
Asian Journal of Chemistry | Year: 2013

A new type of magnetic nanoparticle Fe3O4@ZrO(OH) 2 was prepared in Fe3O4 coated with zirconium oxyhydrate in order to remove high concentration toxic substances i.e., As(III/V) from aqueous solutions. This magnetic nanoparticle contained high attractive toward arsenic because zirconium oxyhydrate and excellent magnetic separability in the high-intensity magnetic field as well as good repeated for many times. The major effects on the removal of As(III/V), such as initial As(III/V) concentration, adsorption time, temperature, solution pH, co-existing anions, deabsorption and removal efficiency were investigated. The results clearly showed that the maximum adsorption capacity of Fe3O 4@ZrO(OH)2 to As(III) and As(V) calculated by Langmuir equation were 188.68 and 108.70 mg/g, respectively. The adsorption time effect followed a pseudo-second-order rate equation, can get contact time to As(III/V) of 20 min to reach equilibrium. The enthalpy change (ΔH°) and entropy change (ΔS°) of As(III) were 17.38, 61.43 J/mol/K, which indicates the spontaneous nature of the As(III) adsorption process. The adsorption capacity of As(III) was increased from solution pH were 2-6 and decreased when pH were 9-12, while As(V) was always decreased along with the increase of solution pH. Interference ions have more effect As(III) than As(V). This magnetic nanoparticle could use more than four times after it was desorbed by NaOH. Besides, after using Fe3O4@ZrO(OH)2 as adsorbent to deal with an initial concentration of 10 mg/L of As(III) and 1 mg/L of As(V) solution, surplus concentration of arsenic less than 10 ppb. It is concluded that the magnetic nanoparticle Fe3O4@ZrO(OH) 2 can be considered as a good settlement performance, high arsenic uptake capability and fine utilization make it potentially excellent and attractive material for arsenic removal in future. Source


Gu B.,Hunan Normal University | Huang L.,Hunan Normal University | Mi N.,Hunan Normal University | Yin P.,Hunan Normal University | And 5 more authors.
Analyst | Year: 2015

A novel ratiometric fluorescent Hg2+ detecting system was rationally developed based on the typical excited state intramolecular proton transfer (ESIPT) characteristic of the latent fluorophore, 2-(1-(p-tolyl)-1H-phenanthro[9,10-d]imidazol-2-yl)phenol (Pol) and the Hg2+-mediated cleavage of the vinyl group. The probe responds selectively to Hg2+ over various other metal ions with a larger bathochromic shift (∼100 nm). The sensing mechanism was investigated in detail by fluorescence spectroscopy, NMR spectra and mass spectrometry. Taking advantage of the enhancement effect of dichloromethane on the ESIPT efficiency, a facile dichloromethane extraction was introduced in the process of detection of Hg2+, which affords a high sensitivity for the probe with a detection limit of 7.8 × 10-9 M for Hg2+. By using the new strategy, the novel probe can be used for the detection of Hg2+ in practical water samples with good recovery. Moreover, the probe was successfully applied to the fluorescence image of Hg2+ in living cells. These results indicated that the probe and the proposed method have promising applications for Hg2+ sensing in biological and environmental sciences. This journal is © The Royal Society of Chemistry 2015. Source


Zhan Y.,Key Laboratory of Jiangxi Province for Ecological Diagnosis Remediation and Pollution Control | Luo X.,Key Laboratory of Jiangxi Province for Ecological Diagnosis Remediation and Pollution Control | Luo X.,Nanchang Hangkong University | Nie S.,Key Laboratory of Jiangxi Province for Ecological Diagnosis Remediation and Pollution Control | And 5 more authors.
Industrial and Engineering Chemistry Research | Year: 2011

A novel Cu(II) magnetic ion-imprinted polymer (MIIP) was prepared via the sol-gel method. The Cu(II)-MIIP exhibited good magnetic property and thermal stability. The binding characteristics of Cu(II)-MIIP were studied by adopting both static and dynamic adsorption experiments. The maximum adsorptions calculated from the Langmuir isotherm are 58.20 and 23.10 mg/g for Cu(II)-MIIP and magnetic nonimprinted polymer (MNIP), respectively. The kinetics studies showed that the adsorption process obeyed a pseudo-second-order kinetic model. The selectivity coefficients of the Cu(II)-MIIP for Cu(II) in the presence of Zn(II) and Ni(II) are 49.44 and 50.38, respectively. The relative selectivity coefficients of Cu(II)-MIIP for Cu(II)/Zn(II) and Cu(II)/Ni(II) are 12.36 and 8.73, respectively. Moreover, Cu(II)-MIIP could be used five times without obvious deterioration in their adsorption capacities. © 2011 American Chemical Society. Source


Jiang H.,Key Laboratory of Jiangxi Province for Ecological Diagnosis Remediation and Pollution Control | Jiang H.,Key Laboratory of Jiangxi Province for Persistant Pollutants Control and Resources Recycle | Jiang H.,Nanchang Hangkong University | Chen P.,Nanchang Hangkong University | And 14 more authors.
Journal of Inorganic and Organometallic Polymers and Materials | Year: 2013

A novel biocompatible composite Fe3O4/ZrO2/chitosan was synthesized in a simple way and its capacity of dye removal was investigated in this study. The morphology of the material was examined by SEM and TEM and found to be nanosized and spheroidal. Equilibrium adsorption isotherms and dynamic behaviors of the adsorption process were investigated in detail. The material saturated with dye could be regenerated by treatment with strong alkali solution. The composite has high adsorption capacity towards acidic dyes represented by amaranth and tartrazine, and remains intact under conditions that are strongly acidic or alkali. The material has high potential to be applied for the removal of acidic dyes in industrial wastewater in large scale. © 2012 Springer Science+Business Media New York. Source


Luo X.,Key Laboratory of Jiangxi Province for Ecological Diagnosis Remediation and Pollution Control | Luo X.,Nanchang Hangkong University | Luo S.,Key Laboratory of Jiangxi Province for Ecological Diagnosis Remediation and Pollution Control | Luo S.,Nanchang Hangkong University | And 8 more authors.
Journal of Hazardous Materials | Year: 2011

A novel Cu (II) magnetic ion-imprinted polymer (MIIP) was synthesized by surface imprinting technique combined with a sol-gel process. The adsorbent of Cu (II)-MIIP shows higher capacity and selectivity than that of magnetic non-imprinted polymers (MNIP). Adsorption capacities of Cu (II)-MIIP and MNIP are 24.2 and 5.2mg/g for Cu (II) ions, respectively. The selectivity coefficients of the Cu (II)-MIIP for Cu (II)/Zn (II) and Cu (II)/Ni (II) are 91.84 and 133.92, respectively. Kinetics studies show that the adsorption process obeys pseudo-second-order rate mechanism with an initial adsorption rate of 132.48 for Cu (II)-MIIP and 2.41mgg -1min -1 for MNIP. In addition, no obvious decrease was observed after up to five adsorption cycles, indicating that the Cu (II)-MIIP is of high stability. © 2011 Elsevier B.V. Source

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