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Related Concept Videos

Factors Affecting Solubility04:01

Factors Affecting Solubility

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Compared with pure water, the solubility of an ionic compound is less in aqueous solutions containing a common ion (one also produced by dissolution of the ionic compound). This is an example of a phenomenon known as the common ion effect, which is a consequence of the law of mass action that may be explained using Le Chȃtelier’s principle. Consider the dissolution of silver iodide:
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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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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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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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Precipitation and Co-precipitation01:17

Precipitation and Co-precipitation

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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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Colloidal precipitates01:09

Colloidal precipitates

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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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Manganese Removal Using Functionalised Thiosalicylate-Based Ionic Liquid: Water Filtration System Application.

Ain Aqilah Basirun1, Wan Azlina Wan Ab Karim2, Ng Cheah Wei3

  • 1Centre of Research in Ionic Liquids (CORIL), Institute of Contaminant Management (ICM), Universiti Teknologi PETRONAS, Seri Iskandar 32610, Perak, Malaysia.

Molecules (Basel, Switzerland)
|August 12, 2023
PubMed
Summary

This study developed a new hydrogel adsorbent for removing toxic manganese (Mn) from industrial wastewater. The functionalized thiosalicylate-based ionic liquid in PVA-alginate beads achieved over 98% Mn removal efficiency.

Keywords:
manganeseresponse surface methodologythiosalicylate ionic liquidwater filtration system

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Area of Science:

  • Environmental Chemistry
  • Materials Science
  • Chemical Engineering

Background:

  • Industrial wastewater often contains toxic heavy metals like manganese (Mn), posing significant environmental and health risks.
  • Conventional treatment methods can be inefficient or costly, necessitating the development of advanced remediation technologies.
  • Ionic liquids offer unique properties for adsorption, but their application in wastewater treatment requires stable and reusable matrices.

Purpose of the Study:

  • To synthesize and characterize a novel polymeric hydrogel adsorbent for effective manganese removal from industrial wastewater.
  • To investigate the adsorption performance of functionalized thiosalicylate-based ionic liquid incorporated into polyvinyl alcohol (PVA)-alginate beads.
  • To optimize the adsorption process parameters and evaluate the material's reusability and industrial applicability.

Main Methods:

  • A functionalized thiosalicylate-based ionic liquid (1-hexylimidazole propionitrile thiosalicylate, [HIMP][TS]) was synthesized and immobilized onto PVA-alginate beads.
  • Structural characterization was performed using Fourier Transform Infrared Spectroscopy (FTIR) and Field Emission Scanning Electron Microscopy (FESEM).
  • Manganese concentration and removal efficiency were quantified using Atomic Absorption Spectroscopy (AAS), with process optimization via Box-Behnken design.

Main Results:

  • The PVA-alginate-[HIMP][TS] beads demonstrated high structural integrity and effective manganese adsorption.
  • Optimal conditions for Mn removal were identified as pH 7.15, 60 min contact time, and 38.26 g/L adsorbent dosage, achieving 98.91% removal efficiency.
  • The adsorbent exhibited excellent performance in a prototype filtration system (99.14% removal) and maintained high efficiency over four regeneration cycles, with an adsorption capacity of 56 mg/g.

Conclusions:

  • The developed alginate-thiosalicylate-based ionic liquid system is a highly effective and eco-friendly adsorbent for removing manganese from industrial wastewater.
  • The PVA-alginate-[HIMP][TS] beads show significant potential for practical industrial applications due to their high efficiency, reusability, and stability.
  • This study presents a promising approach for heavy metal remediation, contributing to cleaner industrial processes and environmental protection.