Abstract
Heavy metal ions contaminate water environment through point sources and nonpoint sources. Heavy metal ions are categorized as inorganic contaminants by both the WHO and the USEPA. The heavy metal ions are increasingly being introduced into the environment as pollutants and contaminants resulting from human activities.
Magnetic particles for water treatment applications have received considerable attention from researchers due to high separation efficiency. The magnetic particles behave similar to or even better than various commercial adsorbents. The magnetic particles also exhibit high selectivity for the target pollutants from the environment besides enabling ease of operation for reducing the particle separation steps from the flowing stream. A comprehensive and systematic understanding of synthesis and surface modifications of magnetic particles is significant to enhance their practicability in environmental technology. Although high removal performance and reactivity can be achieved by smaller particle size, the stability, toxicity, and recovery of the particles magnetically could be challenging.
In contrast, the active surface of magnetic particles may be forfeited, while surface modifications stabilize and reduce the toxicity of the particles. Reliable surface modifications are necessarily needed for the increment of the number of active sites to remove the heavy metals. For successful environmental applications of the magnetic particles, modification on the magnetic particles is principally crucial to balance the effects on their reactivity, capacity, and reusability.
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Abbreviations
- ɣ-Fe2O3:
-
Maghemite
- Ag:
-
Silver
- BHmax:
-
Highest energy product
- Br:
-
Remanence
- Ca:
-
Calcium
- Cd2+:
-
Cadmium cation
- CdS:
-
Cadmium sulfide
- CdSe:
-
Cadmium selenide
- Cu:
-
Copper
- Cu2+:
-
Copper cation
- Co:
-
Cobalt
- Cr4+:
-
Chromium cation (4+)
- Fe:
-
Iron
- FeO−:
-
Negative charge iron oxide
- Fe3O4:
-
Magnetite
- Fe3S4:
-
Greigite
- Gd:
-
Gadolinium
- Hc:
-
Coercive force
- Hg2+:
-
Mercuric cation
- HGMS:
-
High-gradient magnetic separation
- Mg:
-
Magnesium
- MIEX:
-
Magnetic ion exchange resin
- Mn:
-
Manganese
- MnFe2O4:
-
Manganese iron oxide
- MnO:
-
Manganese(II) oxide
- Mn-Zn:
-
Manganese-zinc
- Nd:
-
Neodymium
- Nd-Fe-B:
-
Neodymium, iron, and boron
- Na+:
-
Sodium cation
- Ni:
-
Nickel
- Ni2+:
-
Nickel cation
- NiFe2O4:
-
Nickel iron oxide/nickel ferrite
- nZVI:
-
Nano zerovalent iron
- Pb2+:
-
Lead cation
- Si:
-
Silicon
- Sm-Co:
-
Samarium-cobalt
- SPIONs:
-
Superparamagnetic iron oxide nanoparticles
- Tc:
-
Curie temperature
- USA:
-
United States of America
- USEPA:
-
US Environmental Protection Agency
- WHO:
-
World Health Organization
- Zn:
-
Zinc
- ZnFe2O4:
-
Zinc ferrite
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Glossary
Glossary
- Adsorbent :
-
A material which will allow a liquid, gas, or dissolved solid to adhere to its surface
- Adsorption :
-
A process by which a solid holds molecules of a gas or liquid or solute as a thin film
- Carbon nanotubes :
-
Cylindrical molecules that consist of rolled-up sheets of single-layer carbon atoms (graphene)
- Chemical stability :
-
Resistance of a chemical to change in a chemical reaction
- Coprecipitation :
-
Simultaneous precipitation of more than one compound from a solution
- Curie temperature :
-
Temperature at which certain magnetic materials undergo a sharp change in their magnetic properties
- Heavy metal ions :
-
Metallic cation and anion that have relatively high density and are toxic or poisonous at low concentrations
- Hydrothermal :
-
A chemical reaction in water at both high temperature and pressure in a sealed pressure vessel
- Ion exchange :
-
A reversible chemical reaction where dissolved ions are removed from the solution and replaced with other ions of the same or similar electrical charge
- Ion exchange resin :
-
A resin that acts as a medium for ion exchange
- Magnetic force :
-
Attractive or repulsive force that is exerted between the poles of a magnet and electrically charged moving particles
- Magnetic field :
-
A vector field that describes the magnetic influence of electric charges in relative motion and magnetized materials
- Magnetic sorption technology :
-
A process by which a magnetic solid holds molecules of a gas or liquid or solute as a thin film
- Mechanical stability :
-
The quality of being free from change or variation
- Microemulsion :
-
A thermodynamically stable, isotropic emulsion with a droplet size of 1–100 nm
- Nanoparticle :
-
A microscopic particle with at least one dimension less than 100 nm
- Permanent magnet :
-
Material with the magnetic field that is generated by the internal structure of the material itself
- Pyrolysis :
-
Decomposition brought about by high temperatures
- Reverse micelle :
-
Aqueous-phase droplet in organic solvent that is stabilized by surfactant
- Sol-gel :
-
A wet chemical process involving the formation of an inorganic colloidal suspension (sol) and gelation of the sol in a continuous liquid phase (gel) to form a three-dimensional network structure
- Stöber method :
-
A chemical process for preparation of silica (SiO2) particles of controllable and uniform size
- Sonochemical :
-
Application of ultrasound to chemical reactions and processes
- Thermal decomposition :
-
Some compounds breaking down when heated, forming two or more products from one reactant
- Thermal stability :
-
The ability of the material to resist the action of heat and to maintain its properties
- Toxic substances :
-
Substances that can be poisonous or cause health effects
- Water purification :
-
The process of removing undesirable chemicals, biological contaminants, suspended solids, and gases from water
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Lim, SF., Lee, A.YW., Chua, S.N.D., Lim, BH. (2021). Removal of Heavy Metal Ions Using Magnetic Materials. In: Wang, L.K., Wang, MH.S., Hung, YT., Shammas, N.K. (eds) Integrated Natural Resources Management. Handbook of Environmental Engineering, vol 20. Springer, Cham. https://doi.org/10.1007/978-3-030-55172-8_10
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