Adsorption of organic ligands on low surface charge clay minerals: the composition in the aqueous interface region

2018 ◽  
Vol 20 (25) ◽  
pp. 17226-17233 ◽  
Author(s):  
S. Jelavić ◽  
S. L. S. Stipp ◽  
N. Bovet
Keyword(s):  
Aqueous Solutions ◽  
Surface Charge ◽  
Clay Minerals ◽  
Organic Ligands ◽  
Interface Region ◽  
Direct Measurements

We show direct measurements of the composition in the interface between clay minerals and aqueous solutions containing organic ligands.

scholarly journals Electrokinetic Properties of Cassiterite and Quartz Particles in the Presence of Cationic, Anionic and Non-ionogenic Surfactants

1994 ◽  
Vol 11 (3) ◽  
pp. 161-174 ◽  
Author(s):  
Fouad Taha ◽  
M.B. Saleh ◽  
K.M.E. Attyia ◽  
M.M.R. Khalaf
Keyword(s):  
Aqueous Solutions ◽  
Surface Charge ◽  
Sodium Dodecyl Sulphate ◽  
Primary Amine ◽  
Negative Charge ◽  
Sodium Dodecyl ◽  
Amine Hydrochloride ◽  
Solution Properties ◽  
Zeta Potentials ◽  
Isoelectric Points

The surface charge properties of cassiterite and quartz particles in primary amine hydrochloride, sodium oleate, sodium dodecyl sulphate, phenyl disodium orthophosphate, 4-nitrophenyl disodium orthophosphate and starch solutions have been monitored using particle microelectrophoresis. The zeta potentials of the oxides and their isoelectric points (IEPs) were determined as a function of pH in the presence of different surfactant concentrations. In general, cassiterite and quartz particles acquired a negative charge in the various aqueous solutions and were dramatically influenced by both pH and the presence of surfactants. The magnitude of the surface charge varied considerably and could adopt positive or negative values. The IEPs also varied depending on the solution properties.

Surface Charge of the Calcite (104) Terrace Measured by Rb+Adsorption in Aqueous Solutions Using Resonant Anomalous X-ray Reflectivity

2016 ◽  
Vol 120 (28) ◽  
pp. 15216-15223 ◽  
Author(s):  
Sang Soo Lee ◽  
Frank Heberling ◽  
Neil C. Sturchio ◽  
Peter J. Eng ◽  
Paul Fenter
Keyword(s):  
Aqueous Solutions ◽  
Surface Charge ◽  
X Ray

scholarly journals On the colorimetric measurement of aqueous Si in the presence of organic ligands and common pH buffering agents

2014 ◽  
Vol 78 (6) ◽  
pp. 1431-1436 ◽  
Author(s):  
Thomas Rinder ◽  
Eric H. Oelkers
Keyword(s):  
Aqueous Solutions ◽  
Aqueous Phase ◽  
Organic Ligands ◽  
Hydrogen Phthalate ◽  
Hydrogen Phosphate ◽  
Colorimetric Measurement ◽  
Ph Buffering ◽  
The Common ◽  
Concentration Measurements ◽  
Aqueous Complexes

The effects of the presence of ten organic ligands and common pH buffering agents – acetate, oxalate, tartrate, citrate, phthalate, EDTA, carbonate, TRIS, phosphate and borate – on aqueous Si concentration measurements made using the common molybdate blue method were quantified. The concentrations of these additives ranged from 0.01 to 0.1 mol/kg in the measured aqueous solutions. Whereas measured Si concentrations were not affected by the presence of up to 0.1 mol/kg acetate, hydrogen phthalate or TRIS, the presence of 0.1 mol/kg of all other selected additives altered substantially the measured Si concentrations using the molybdate blue method. For example the presence of 0.1 mol/kg of citrate, EDTA, and hydrogen phosphate decreased the ratio of measured to true Si concentrations to ~0.05. These variations are interpreted to stem from the formation of competing aqueous complexes in the aqueous phase limiting the formation of the characteristically blue SiMo12O404– complex.

Surface Charge and Adsorption Characteristics for Fluoride of Hexadecyltrimethylammonium Modified Vermiculite

2013 ◽  
Vol 781-784 ◽  
pp. 2265-2268 ◽  
Author(s):  
Shi Yong Wei ◽  
Xu Hong Deng
Keyword(s):  
Aqueous Solutions ◽  
Surface Charge ◽  
Adsorption Capacity ◽  
Langmuir Model ◽  
Point Of Zero Charge ◽  
Hexadecyltrimethylammonium Bromide ◽  
Fluoride Ions ◽  
Langmuir Adsorption ◽  
Adsorption Characteristics ◽  
Adsorption Data

HDTMA-modified vermiculite (HDTMA-Ver) was formed in a suspension by the interactions between vermiculite and hexadecyltrimethylammonium bromide (HDTMA). For vermiculite and HDTMA-Ver, the pH of the point of zero charge (pHpzc) is 3.16 and 5.09, the surface charge at pH 4.5 is-0.167 and 0.083 mmol/g, and the Langmuir adsorption capacity (qmax) is 4.98 and 8.67 mg/g, respectively. The adsorption data for fluoride by vermiculite and HDTMA-Ver could be fitted by Langmuir model. The as-prepared HDTMA-Ver exhibited excellent ability to remove fluoride ions from aqueous solutions.

Effect of Chlorite Clay-Mineral Dissolution on the Improved Oil Recovery From Sandstone Rocks During Diethylenetriaminepentaacetic Acid Chelating-Agent Flooding

SPE Journal ◽  
2018 ◽  
Vol 23 (05) ◽  
pp. 1880-1898 ◽  
Author(s):  
Mohamed Ahmed El-Din Mahmoud
Keyword(s):  
Contact Angle ◽  
Surface Charge ◽  
Clay Minerals ◽  
Oil Recovery ◽  
Chelating Agent ◽  
Oil Reservoirs ◽  
Diethylenetriaminepentaacetic Acid ◽  
Improved Oil Recovery ◽  
Angle Measurements ◽  
Contact Angle Measurements

Summary Sandstone oil reservoirs consist of different clay minerals, such as kaolinite, illite, and chlorite. While these clay minerals can highly affect oil recovery from sandstone oil reservoirs, no attention has been given to investigating the effects of clay minerals during such oil recovery, and no solution has been introduced to alleviate the effects. In this study, and for the first time, the effect of chlorite clay-mineral content on the improved oil recovery (IOR) from different sandstone rock samples was investigated. A new solution was proposed to eliminate the effect of chlorite on the oil recovery from sandstone rocks. Different sandstone cores were used, such as Berea (BSS), Bandera (BND), Kentucky (KSS), and Scioto (SCS) sandstone rocks with different clay minerals. ζ-potential measurements were used to investigate the surface charge of the different clays and different sandstone rocks with different fluids. Fluids such as seawater (SW), low-salinity water (LSW), fresh water, and chelating agents were used. Diethylenetriaminepentaacetic acid (DTPA) chelating agent was introduced to mitigate the chlorite effect on oil recovery from sandstone rocks. The wettability was evaluated using contact-angle measurements and the Amott test for different solutions and different rocks in the presence of actual crude oil. Coreflooding experiments were conducted using these fluids with different sandstone rocks to identify the effect of chlorite on the oil recovery. Coreflooding experiments showed that sandstone cores with high chlorite content yielded the lowest oil recovery when SW and LSW were used. The effect of chlorite on the oil recovery from the two sandstone rocks was minimized with 3 wt% DTPA chelating agent. More oil was recovered in the case of DTPA because of the iron chelation from chlorite. ζ-potential showed that sandstone with high chlorite content has a surface charge close to zero in the case of SW and fresh water. In addition, contact-angle measurements showed that samples with high chlorite content have less water-wetness, which will reduce oil recovery. Contact-angle measurements on chlorite sheets showed that chlorite is oil-wet compared with mica at the same conditions. The addition of high-pH DTPA chelating agent sequestered the iron from the chlorite clay minerals and changed the surface charge to very high negative value, and the contact angle confirmed that the rock changed to water-wet after adding the chelating agent. The Amott index showed that adding DTPA increased the water-wetness for SCS that contains 4 wt% chlorite.

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