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Related Concept Videos

Coagulation01:06

Coagulation

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Colloidal solids are solid particles suspended in solution. They are usually negatively charged, attracting a compact primary layer of positively charged ions, which attract more counterions to form an electrical double layer. Electrostatic repulsion between the charged double layers prevents the particles from colliding, stabilizing the colloids. These solids are often undesirable because they can contain toxins that are difficult to remove. Coagulation is a technique that helps aggregate and...
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The high insolubility of some precipitates can result in an unfavorable relative supersaturation. This can lead to colloidal particles with a large surface-to-mass ratio, where adsorption is promoted. For instance, in the precipitation of silver chloride, silver ions are adsorbed on the surface of the colloidal particles, forming a primary layer. This layer attracts ions of opposite charge (such as nitrate ions), forming a diffuse secondary layer of adsorbed ions. This electric double layer...
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Precipitation and coprecipitation methods can be used to separate a mixture of ions in a solution. In qualitative inorganic analysis, ions that form sparingly soluble precipitates with the same reagent are separated based on the differences in solubility products. For example, consider the separation of Cu(II) and Fe(II) ions by precipitation as insoluble sulfides. First, copper(II) sulfide is precipitated by the addition of acidic H2S, where the dissociation of H2S is suppressed. Adding H2S...
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Extraction: Advanced Methods00:56

Extraction: Advanced Methods

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Metal ions can be separated from one another by complexation with organic ligands–the chelating agent– to form uncharged chelates. Here, the chelating agent must contain hydrophobic groups and behave as a weak acid, losing a proton to bind with the metal. Since most organic ligands used in this process are insoluble or undergo oxidation in the aqueous phase, the chelating agent is initially added to the organic phase and extracted into the aqueous phase. The metal-ligand complex is...
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Sulfur Assimilation01:20

Sulfur Assimilation

222
Sulfur is an essential element in biological systems, contributing to synthesizing key biomolecules, including amino acids such as cysteine and methionine, and cofactors such as coenzyme A and biotin. Microorganisms primarily assimilate sulfur as sulfate (SO₄²⁻) from the environment, which must undergo a series of biochemical transformations before it can be incorporated into cellular components. As sulfate is highly oxidized, it must undergo assimilatory sulfate reduction to...
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Ion Exchange01:17

Ion Exchange

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Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or...
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Related Experiment Video

Updated: Dec 8, 2025

Tangential Flow Ultrafiltration: A &ldquo;Green&rdquo; Method for the Size Selection and Concentration of Colloidal Silver Nanoparticles
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Sulfate removal using colloid-enhanced ultrafiltration: performance evaluation and adsorption studies.

Weiyun Lin1, Baiyu Zhang2, Xudong Ye1

  • 1The Northern Region Persistent Organic Pollution Control (NRPOP) Laboratory, Civil Engineering, Faculty of Engineering and Applied Science, Memorial University, St. John's, NL, A1B 3X5, Canada.

Environmental Science and Pollution Research International
|September 24, 2020
PubMed
Summary

Colloid-enhanced ultrafiltration effectively removes sulfate ions using micellar-enhanced ultrafiltration (MEUF) and polymer-enhanced ultrafiltration (PEUF). PEUF demonstrates superior performance, though membrane fouling requires consideration for optimal sulfate removal.

Keywords:
Adsorption isothermAdsorption kineticsColloid-enhanced ultrafiltration (CEUF)Micellar-enhanced ultrafiltration (MEUF)Polymer-enhanced ultrafiltration (PEUF)Sulfate removal

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Tangential Flow Ultrafiltration: A &ldquo;Green&rdquo; Method for the Size Selection and Concentration of Colloidal Silver Nanoparticles
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Sulfate Separation by Selective Crystallization with a Bis-iminoguanidinium Ligand
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Area of Science:

  • Environmental Chemistry
  • Water Treatment Technologies
  • Separation Science

Background:

  • Sulfate ion contamination in aqueous solutions poses environmental and health concerns.
  • Conventional sulfate removal methods can be inefficient or costly.
  • Colloid-enhanced ultrafiltration (CEUF) offers a promising alternative for sulfate remediation.

Purpose of the Study:

  • To investigate the efficacy of micellar-enhanced ultrafiltration (MEUF) and polymer-enhanced ultrafiltration (PEUF) for sulfate ion removal.
  • To evaluate the impact of varying sulfate and colloid concentrations on ultrafiltration performance.
  • To elucidate the adsorption mechanisms and kinetics governing sulfate-colloid interactions.

Main Methods:

  • Batch experiments were conducted using cetyltrimethylammonium (CTAB) for MEUF and poly(diallydimethylammonium chloride) (PDADMAC) for PEUF.
  • Ultrafiltration performance was assessed across a range of sulfate (0-20 mM) and colloid (0-100 mM) concentrations.
  • Adsorption equilibrium (Freundlich isotherm) and kinetics (pseudo-second-order) were studied to understand sulfate-colloid interactions.

Main Results:

  • CEUF achieved high sulfate retention rates (>99%) in dilute solutions.
  • At 10 mM sulfate, 50 mM CTAB or PDADMAC retained approximately 90% of sulfate ions.
  • Adsorption followed Freundlich isotherm and pseudo-second-order kinetics, indicating chemisorption on heterogeneous surfaces.
  • PEUF exhibited higher retention and capacity than MEUF but experienced greater flux decline and fouling.

Conclusions:

  • Both MEUF and PEUF are effective techniques for removing sulfate ions from aqueous solutions.
  • PEUF offers advantages in efficiency and capacity, but membrane fouling necessitates careful operational adjustments, such as using higher molecular weight cut-off membranes.
  • Reversible membrane fouling suggests the potential for membrane reuse in CEUF processes.