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Related Concept Videos

Extraction: Advanced Methods00:56

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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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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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Updated: Jun 7, 2025

Removal of Arsenic Using a Cationic Polymer Gel Impregnated with Iron Hydroxide
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Engineered Mg-modified biochar-based sorbent for arsenic separation and pre-concentration.

Vladimír Frišták1, Kristína Beliančínová2, Lucia Polťáková2

  • 1Department of Chemistry, Faculty of Education, Trnava University in Trnava, Priemyselná 4, P.O.BOX 9, Trnava, SK- 91843, Slovakia. fristak.vladimir.jr@gmail.com.

Scientific Reports
|November 20, 2024
PubMed
Summary
This summary is machine-generated.

This study developed a magnesium-modified biochar (MgBC) from cattail leaves, demonstrating its superior performance in removing anionic analytes like arsenic. MgBC shows a 13.5-fold higher sorption capacity than unmodified biochar (BC), offering an effective solution for sample pretreatment.

Keywords:
AsBiocharGreen chemistryPre-concentrationSorption

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Area of Science:

  • Environmental Chemistry
  • Materials Science
  • Analytical Chemistry

Background:

  • Biochar is an emerging sorbent for sample pretreatment.
  • Modification of biochar properties can enhance its sorption capabilities.
  • Cattail leaf biomass offers a sustainable precursor for biochar production.

Purpose of the Study:

  • To prepare and characterize biochar (BC) and magnesium-modified biochar (MgBC) from cattail leaf biomass.
  • To evaluate the sorption performance of BC and MgBC for anionic analytes, specifically arsenic (As).
  • To investigate the influence of pH and competing anions on As sorption and assess the desorption efficiency.

Main Methods:

  • Slow pyrolysis of unmodified cattail leaf biomass (BC) and Mg-modified biomass (MgBC) at 500 °C.
  • Physicochemical characterization using techniques like pH, C/N analysis, SSA, 13C NMR, SEM-EDX, and XRD.
  • Sorption experiments using Langmuir and Sips isotherms and pseudo-nth order kinetic models.
  • Evaluation of interference from phosphate and chloride ions and desorption studies using NaOH.

Main Results:

  • MgBC exhibited significantly different physicochemical properties compared to BC.
  • The maximum sorption capacity of MgBC for As was 13.5-fold higher than that of BC.
  • Sorption followed Sips isotherm and pseudo-nth order kinetics, with optimal pH between 5-6.
  • Phosphate ions significantly reduced As sorption capacity, while chloride ions had no significant effect.
  • Desorption efficiency exceeded 95% using 0.1 mol/L NaOH, and MgBC showed 35% As retention in a model SPE column.

Conclusions:

  • Mg-modified biochar derived from cattail leaves is a highly effective sorbent for anionic analytes.
  • The enhanced sorption capacity of MgBC presents a promising advancement for preconcentration and separation techniques in analytical chemistry.
  • This study highlights the potential of tailored biochar materials for environmental remediation and sample analysis.