scholarly journals Selective Flocculation Study of Hematite in HematiteQuartz-Kaolinite System in Presence of Ca2+, Mg2+ and Fe3+ Ions. Part1: Optimization of Ligand

2021 ◽  
Vol 40 (3) ◽  
pp. 531-538
Author(s):  
Muhammad Ishaque Abro ◽  
Abdul Jaleel Laghari ◽  
Umair Aftab ◽  
Sikander Ali Channa ◽  
Mukesh Kumar
Keyword(s):  
Zeta Potential ◽  
Metal Ions ◽  
Strong Interaction ◽  
Optimal Dose ◽  
Selective Flocculation ◽  
Minimum Threshold ◽  
Polyvalent Metal ◽  
Threshold Difference ◽  
Over Dispersion ◽  
Mineral Interaction

Separation of ultrafine hematite from quartz and kaolinite gangue minerals using selective flocculation technique is markedly affected by the state of inter mineral interaction which is governed by type and content of polyvalent metal ions. Because of the presence of polyvalent metal ions hetracoagulation of gangue minerals is widely acknowledged, thus selective flocculation of ultrafine hematite from associated gangue minerals is challenging task when their concentration is above 10 ppm. This study has shown that state of strong interaction of gangue minerals with hematite due to presence of 15 ppm Ca2+, 3 ppm Mg2+ and 3 ppm Fe3+ ions can be weakened by addition of optimal dose of Sodium Hexametaphosphate (SHMP) ligand. The optimization of ligand dose is achieved through analysis of Zeta Potential (ZP) as a function of slurry pH. It is noted that 50 ppm of SHMP is sufficient to restore the ZP of hematite, where selective dispersion of the slurry constituents are possible. Our results further showed that conventional strategy of obtaining minimum difference of ±30 mV in the ZP of hematite and gangue minerals quartz and kaolinite would not work especially in the presence of 15 ppm Ca2+, 3 ppm Mg2+ and 3 ppm Fe3+ ions. Attempts to achieve the minimum threshold difference in the ZP of the minerals will cause over dispersion.

scholarly journals Evaluation of N-Alkyl-bis-o-aminobenzamide Receptors for the Determination and Separation of Metal Ions by Fluorescence, UV-Visible Spectrometry and Zeta Potential

Molecules ◽  
2019 ◽  
Vol 24 (9) ◽  
pp. 1737 ◽  
Author(s):  
Marisela Martinez-Quiroz ◽  
Xiomara E. Aguilar-Martinez ◽  
Mercedes T. Oropeza-Guzman ◽  
Ricardo Valdez ◽  
Eduardo A. Lopez-Maldonado
Keyword(s):  
Aqueous Solution ◽  
Zeta Potential ◽  
Metal Ions ◽  
Environmental Concern ◽  
Separation Of Metal Ions ◽  
Complexing Capacity ◽  
Alkyl Groups ◽  
Molecular Fluorescence ◽  
Uv Visible ◽  
Phase Sensor

This paper presents the synthesis and evaluation of physicochemical behavior of a new series of N-alkyl-bis-o-aminobenzamides (BOABs) in aqueous solution. The study was targeted to the complexing capacity of five metal ions (Fe2+, Cu2+, Cd2+, Hg2+ and Pb2+) of environmental concern as the medullar principle of a liquid phase sensor for its application in the determination of these metal ions due to its versatility of use. Molecular fluorescence, UV-visible and Zeta potential were measured for five BOABs and the effect of alkyl groups with different central chain length (n = 3, 4, 6, 8 and 10) on physicochemical performance determined. The results have shown that these derivatives present higher sensibility and selectivity for Cu2+ even in the presence of the other metal ions. An additional application test was done adding a pectin (0.1 wt %) solution to the BOAB-Cu+2 complex to obtain a precipitate (flocs) as a potential selective separation process of Cu from aqueous solution. The solid was then lyophilized and analyzed by SEM-EDS, the images showed spheric forms containing Cu+2 with diameter of approximately of 8 μm and 30 wt %.

Study of Flocculation Mechanisms by Observing Effects of a Complexing Agent on Activated Sludge Properties

1991 ◽  
Vol 24 (7) ◽  
pp. 21-28 ◽  
Author(s):  
L. Eriksson ◽  
B. Alm
Keyword(s):  
Activated Sludge ◽  
Metal Ions ◽  
Electrostatic Interactions ◽  
Wastewater Treatment Plants ◽  
Sedimentation Velocity ◽  
Complexing Agent ◽  
Extracellular Polymers ◽  
Filtration Resistance ◽  
Polyvalent Metal ◽  
Sludge Properties

Electrostatic interactions between bacterial surfaces, extracellular polymers (ECP) and polyvalent metal ions are important in activated sludge flocculation. An indirect study of these mechanisms was done by adding different concentrations of EDTA to activated sludge samples from 6 Swedish wastewater treatment plants. The effects on sludge properties were studied with sedimentation and filtration tests as well as analysis of released extracellular polymers. EDTA had a significant effect on sedimentation velocity in all investigated sludges. This shows that charged polymers are important for the properties of the floc surfaces and in building up the sludge macroflocs. The effect on filtration resistance where the bulk properties of the primary flocs are more important varied considerably for the different sludges. Thus, both electrostatic and other interactions are involved to a varying extent in building up the primary flocs in the sludges investigated. Variations in sedimentation velocity, residual turbidity, filtration resistance and release of ECP with variations in EDTA concentrations could be explained by effects of polyvalent metal ions on ECP binding and conformation.

Investigation of the influence of cationic and anionic ions on the oriented dissolution of calcite

CrystEngComm ◽  
2020 ◽  
Vol 22 (32) ◽  
pp. 5316-5322
Author(s):  
Yuzhe Zhang ◽  
Jiangfeng Li ◽  
Limin Qi ◽  
Yurong Ma
Keyword(s):  
Metal Ions ◽  
Significant Influence ◽  
Strong Interaction ◽  
Dissolution Process ◽  
Step Edges

Cations (metal ions) have a more significant influence than anions on the oriented dissolution process of calcite and the metastable side faces and step edges of calcite micropyramids, probably due to the strong interaction between cations and CO32−.

The Preparation and Characteristics on Chitosan Nano-Carrier with Different Concentration of TPP

2011 ◽  
Vol 197-198 ◽  
pp. 242-245
Author(s):  
Chih Wei Chou ◽  
Hui Hsuan Hsieh ◽  
Te Hsing Wu
Keyword(s):  
Zeta Potential ◽  
Charge Density ◽  
Electron Micrographs ◽  
Strong Interaction ◽  
Weight Ratio ◽  
Cross Linking ◽  
Zeta Potentials ◽  
Transmission Electron ◽  
Polyelectrolyte Complexation ◽  
Polymer Ratio

In this Study, the Tripolyphosphate-Chitosan (TPP-CS) Nano-Carrier was Prepared by Polyelectrolyte Complexation. TPP and CKGM are Polyanion, and can Interact with Cationic Chitosan by Electrostatic Forces. the Nanoparticles Size was Analyzed by the Transmission Electron Micrographs (TEM) and Scattering Electron Micrographs (SEM). FTIR Confirmed Tripolyphosphoric Groups of TPP and CKGM Linked with Ammonium Groups of Chitosan in the Nanoparticles. the CS Nps were Loaded with the Anticancer Drug, Berberine, by Different Concentration of Cross-Linking Agent. the Zeta Potentials of CKGM and CS were Shown as a Function of Ph. it was Observed that CS has Strong Interaction with CKGM about Ph 5.5. the CKGM-CS Nanoparticles were Formed by Mixed Different Weight Ratio of CS and CKGM. the Morphology of CKGM-CS was Characterized by FESEM. the Size of CKGM-CS Particles was Smaller than 150 Nm. the Zeta Potential of CKGM-CS Particles was Proved that the Polymer Ratio can Control the Charge Density.

Zeta potential of clay minerals and quartz contaminated by heavy metals

2005 ◽  
Vol 42 (5) ◽  
pp. 1280-1289 ◽  
Author(s):  
A Kaya ◽  
Y Yukselen
Keyword(s):  
Heavy Metals ◽  
Zeta Potential ◽  
Metal Ions ◽  
Alkaline Earth ◽  
Alkaline Earth Metals ◽  
Ion Concentration ◽  
Test Results ◽  
Ζ Potential ◽  
Pore Fluid Chemistry ◽  
Electrokinetic Decontamination

Laboratory and in situ test results show that electrokinetic decontamination is a promising subsurface decontamination method. However, it has also been reported that several problems arise, such as reverse flow and pH gradient across the anode and the cathode during the electrokinetic decontamination process. Variation in pH alters the zeta (ζ) potential of soils, which is one of the factors affecting the efficiency of contaminant removal by the electrokinetic method. The magnitude of the ζ potential controls the fluid flow rate, whereas its sign controls the flow direction. However, research on how the ζ potential of soils changes under various chemical conditions is limited. In this paper, the effect of pore-fluid chemistry on the ζ potential of kaolinite, montmorillonite, and quartz powder is determined with NaCl, LiCl, CaCl2·2H2O, MgCl2·6H2O, CuCl2, CoCl2, ZnCl2, AlCl3, and Pb(NO3)2. The test results reveal that the ζ potential of the minerals with alkali and alkaline-earth metals changes according to the diffuse electrical double-layer theory. The hydrolyzable metal ions produce two points of zero charge (PZCs), one of which is that of the soil; and the other, that of hydrolyzable oxide. The ζ potential of minerals with hydrolyzable metal ions becomes increasingly positive and reaches its maximum value at neutral pH. It then decreases and again reaches very negative values at alkaline pH values (pH ∼ 10), depending on ion concentration and the bulk precipitation pH of hydrolyzable metals as hydrolyzable oxides. On the basis of the results of this study, it is recommended that the ζ potential of the soils be determined before electrokinetic decontamination.Key words: alkaline-earth metals, electrokinetic decontamination, heavy metals, zeta potential.

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