Evaluation of polymer-coated magnetic nanoparticles for oil separation under environmentally relevant conditions: effect of ionic strength and natural organic macromolecules

2016 ◽  
Vol 3 (4) ◽  
pp. 780-787 ◽  
Author(s):  
Seyyedali Mirshahghassemi ◽  
Bo Cai ◽  
Jamie R. Lead
Keyword(s):  
Magnetic Nanoparticles ◽  
Ionic Strength ◽  
Fluorescence Spectra ◽  
Oil Removal ◽  
Oil Separation ◽  
Before And After ◽  
Oil Water

Fluorescence spectra for oil–water mixtures before and after oil removal using PVP-coated magnetic nanoparticles under different environmentally relevant conditions.

scholarly journals Adsorption Studies on Magnetic Nanoparticles Functionalized with Silver to Remove Nitrates from Waters

Water ◽  
2021 ◽  
Vol 13 (13) ◽  
pp. 1757
Author(s):  
Yesica Vicente-Martínez ◽  
Manuel Caravaca ◽  
Antonio Soto-Meca ◽  
Miguel Ángel Martín-Pereira ◽  
María del Carmen García-Onsurbe
Keyword(s):  
Magnetic Nanoparticles ◽  
Nitrate Content ◽  
Adsorption Efficiency ◽  
Experimental Conditions ◽  
Dependent Behavior ◽  
Before And After ◽  
Naoh Solution ◽  
High Concentrations ◽  
Interference Studies

This paper presents a novel procedure for the treatment of contaminated water with high concentrations of nitrates, which are considered as one of the main causes of the eutrophication phenomena. For this purpose, magnetic nanoparticles functionalized with silver (Fe3O4@AgNPs) were synthesized and used as an adsorbent of nitrates. Experimental conditions, including the pH, adsorbent and adsorbate dose, temperature and contact time, were analyzed to obtain the highest adsorption efficiency for different concentration of nitrates in water. A maximum removal efficiency of 100% was reached for 2, 5, 10 and 50 mg/L of nitrate at pH = 5, room temperature, and 50, 100, 250 and 500 µL of Fe3O4@AgNPs, respectively. The characterization of the adsorbent, before and after adsorption, was performed by energy dispersive X-ray spectroscopy, scanning electron microscopy, Brunauer-Emmett-Teller analysis and Fourier-transform infrared spectroscopy. Nitrates can be desorbed, and the adsorbent can be reused using 500 µL of NaOH solution 0.01 M, remaining unchanged for the first three cycles, and exhibiting 90% adsorption efficiency after three regenerations. A deep study on equilibrium isotherms reveals a pH-dependent behavior, characterized by Langmuir and Freundlich models at pH = 5 and pH = 1, respectively. Thermodynamic studies were consistent with physicochemical adsorption for all experiments but showed a change from endothermic to exothermic behavior as the temperature increases. Interference studies of other ions commonly present in water were carried out, enabling this procedure as very selective for nitrate ions. In addition, the method was applied to real samples of seawater, showing its ability to eliminate the total nitrate content in eutrophized waters.

Comparative Study on Compositions of Oil-Water Transition Layer before and after ClO2-Treatment Process

2013 ◽  
Vol 652-654 ◽  
pp. 749-752
Author(s):  
Dan Dan Yuan ◽  
Hong Jun Wu ◽  
Hai Xia Sheng ◽  
Xin Sui ◽  
Bao Hui Wang
Keyword(s):  
Chemical Composition ◽  
Transition Layer ◽  
Solid Phase ◽  
Settling Tank ◽  
Physical Structure ◽  
Solid Particles ◽  
Viscosity Reduction ◽  
Insoluble Residue ◽  
Before And After ◽  
Oil Water

In order to meet the need of separating oil from water in the settling tank of the oilfield, ClO2 treatment for oil-water transition layer in settling tank is introduced. The field test displayed that the technique was achieved by a good performance. For understanding the oxidation and mechanism, compositions of oil-water transition layer were comparatively studied for before/after ClO2-treatment in this paper.The experimental results show that the compositions before and after ClO2-treatment, including physical structure and chemical composition, were varied in the great extension. The physical structure, consisting of water, oil and solid phase, was reduced to less than 5% of water and 0.5% of solid particle and increased to 95% of oil in layer compared with before-treatment, easily leading to clearly separating water from oil. The chemical composition of iron sulfide and acid insoluble substance in solid phase was decreased to more than 90% while the carbonate was reduced more than 70% . After the treatment, the viscosity reduction of the water phase in the layer was reached to 50% after oxidation demulsification with ClO2. The chemistry was discussed based on the principles and experiments. Due to ClO2 destroying (oxidizing) the rigid interface membrane structure which is supported by natural surfactant, polymer and solid particles with interface-active materials, the action accelerates the separating of water and oil and sedimentation of insoluble residue of acid in the layer. By demonstrating the experimental data and discussion, we can effectively control the oxidation performance of chlorine dioxide, which is very meaningful for oilfield on the aspect of stable production of petroleum.

Physicochemical Properties of Heavy Oil-Water Interface in the Context of Oil Removal from Seawater by Froth Flotation

2014 ◽  
pp. 279-294
Author(s):  
Louxiang Wang ◽  
Meghan Curran ◽  
Meijiao Deng ◽  
Qingxia Liu ◽  
Zhenghe Xu ◽  
...  
Keyword(s):  
Physicochemical Properties ◽  
Heavy Oil ◽  
Froth Flotation ◽  
Water Interface ◽  
Oil Removal ◽  
Oil Water

scholarly journals Ion-pair chromatographic monitoring of photographic effluents

2007 ◽  
Vol 5 (2) ◽  
pp. 455-465
Author(s):  
Giedrė Kesiũnaitė ◽  
Birutė Pranaitytė ◽  
Audrius Padarauskas ◽  
Arvydas Dikčius ◽  
Romas Ragauskas
Keyword(s):  
Ionic Strength ◽  
Mobile Phase ◽  
Ion Pair ◽  
Chromatographic Technique ◽  
Two Samples ◽  
Neutral Compounds ◽  
Before And After ◽  
Rapid Monitoring ◽  
Chromatographic Monitoring

AbstractIon-pair chromatographic technique was developed for the rapid and simple determination of the main contaminants (bromide, iodide, sulphite, thiosulphate, thiocyanate, iron(III)-EDTA chelate, free EDTA, hydroquinone and phenidone) in spent photographic solutions. Free EDTA was converted into stable Ni(II)-EDTA chelate prior to analysis. The optimal mobile phase conditions were established by varying the concentrations of tetrabutylammonium (TBA) phosphate and acetonitrile, pH and ionic strength. Separation of five inorganic anions, two metal chelates and two neutral compounds was accomplished in about 30 min using a mobile phase containing 7.5 mmol/L TBA-phosphate, 10 mmol/L NaCl (pH 6.5) and 20% (v/v) acetonitrile. The detection limits (UV detection at 210 nm) ranged from 0.4 µmol/L for phenidone to 8 µmol/L for sulphite with a linearity of 2–2.5 orders of magnitude. The method was applied to the rapid monitoring of spent photographic solutions before and after decomposition. The recovery tests established for two samples were within the range 95–103%.

Effect of pipe diameter on horizontal oil-water flow before and after addition of drag-reducing polymer part II: Holdup and slip ratio

2018 ◽  
Vol 162 ◽  
pp. 143-149 ◽  
Author(s):  
A. Abubakar ◽  
Y. Al-Wahaibi ◽  
T. Al-Wahaibi ◽  
A.R. Al-Hashmi ◽  
A. Al-Ajmi ◽  
...  
Keyword(s):  
Water Flow ◽  
Pipe Diameter ◽  
Slip Ratio ◽  
Polymer Part ◽  
Before And After ◽  
Oil Water ◽  
Drag Reducing Polymer

Fluorescence spectra of mineral oil-water intermixture

2005 ◽  
Author(s):  
Liping Shang ◽  
Xiaoxuan Xu ◽  
Jingjun Xu ◽  
Daying Xia ◽  
Jinshan Shi
Keyword(s):  
Fluorescence Spectra ◽  
Mineral Oil ◽  
Oil Water

Facile fabrication of asymmetric wettable fabric with weft backed weave for oil/water separation

RSC Advances ◽  
2016 ◽  
Vol 6 (111) ◽  
pp. 109769-109777 ◽  
Author(s):  
Qibao Liu ◽  
Xiaoyan Li ◽  
Zaisheng Cai
Keyword(s):  
Water Removal ◽  
Oil Removal ◽  
Water Separation ◽  
Oil Water Separation ◽  
Facile Fabrication ◽  
Oil Water

Fabric with weft backed weave gains asymmetric wettability, which has been successfully used for oil/water separation to achieve water-removal and oil-removal.

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