Magnetic Biochar Applications in Wastewater Treatment
Summary
Magnetic biochar has emerged as a versatile and sustainable sorbent for the removal of diverse pollutants from wastewater. Produced by pyrolysis of biomass followed by incorporation of magnetic iron oxides, these composites combine high surface area, abundant functional groups and ease of recovery via external magnetic fields. Applications span the sequestration of heavy metals, dyes and organic contaminants, with surface chemistry tailored through co-precipitation, impregnation or mechanochemical routes. The magnetically responsive phase promotes rapid solid–liquid separation, reducing energy and chemical requirements for downstream processing. Regeneration and reuse over multiple cycles have been demonstrated, reinforcing the potential of magnetic biochar for circular-economy frameworks. Recent advances have focused on optimising synthesis parameters to enhance adsorption capacity, selectivity and stability under variable pH and ionic strength conditions, thereby extending applicability from municipal to industrial effluents on a global scale.
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Magnetic Biochar Applications in Wastewater Treatment publication trend
The graph below shows the total number of articles in magnetic biochar applications in wastewater treatment across all publications each year (not limited to Nature Index journals).
Technical terms
Biochar: Carbonaceous solid material produced by thermal decomposition of biomass in an oxygen-limited environment, prized for high surface area and porous structure.
Magnetite: Naturally occurring iron oxide (Fe₃O₄) used to impart magnetic responsiveness, enabling rapid separation of the adsorbent from treated water.
Adsorption isotherm: Mathematical model describing the relationship between solute concentration in solution and amount adsorbed at equilibrium, often represented by Langmuir or Freundlich equations.
Pseudo-second-order kinetics: Rate model assuming adsorption follows chemisorption, with uptake rate proportional to the square of available surface sites.
pH point of zero charge (pHpzc): The pH at which the net surface charge of an adsorbent is zero, critically influencing electrostatic interactions with charged pollutants.
References
- Adsorption Studies of Pb(II) and Cd(II) Heavy Metal Ions from Aqueous Solutions Using a Magnetic Biochar Composite Material. Separations (2023).
- Rice Straw Biochar and Magnetic Rice Straw Biochar for Safranin O Adsorption from Aqueous Solution. Water (2022).
- Preparation and Characterization of Sludge-Based Magnetic Biochar by Pyrolysis for Methylene Blue Removal. Nanomaterials (2021).
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