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Magnetic materials and magnetic separation of dyes from aqueous solutions: a review

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Abstract

Dye pollution from industries such as dyeing, textile, leather, cosmetics and pigments is of increasing concern, calling for advanced methods of wastewater remediation. Many techniques have been applied to treat such effluents, but adsorption remains the easiest, low-cost, effective and reliable strategies. The recent development of magnetic composites combines properties of both organic and inorganic components and is thus opening new applications for color removal. Here, we review the use of magnetic nanomaterials to adsorb dyes from aqueous solutions. We present sources of water contamination, actual technologies for wastewater treatment, the impact of dyes on health and the environment, dye removal methodologies, and the advantages of magnetic separation. We also discuss nanoparticle synthesis, results on magnetic nanomaterials for dye adsorption, and adsorption models.

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Abbreviations

AFM:

Atomic force microscopy

ANOVA:

Analysis of variance

AR:

Acid red

As:

Arsenic

AY36:

Acid yellow 36

BET:

Brunauer–emmett–teller

BOD:

Biological oxygen demand

BR9:

Basic red 9

CCD:

Central composite design

Cd:

Cadmium

COD:

Chemical oxygen demand

Cr:

Chromium

CTAB:

Cetyl trimethyl ammonium bromides

Cu:

Copper

CV:

Crystal violet

DG6:

Direct green 6

DR23:

Direct red 23

DR31:

Direct red 31

Fe3O4 :

Iron(II, III) oxide

FTIR:

Fourier transform infrared

GA:

Gum arabic

IC:

Indigo carmine

MB:

Methylene blue

MBC:

Magnetic bio-composite

MG:

Malachite green

MGO:

Magnetic graphene oxide

MNPs:

Magnetic nanoparticles

MO:

Methyl orange

NaCl:

Sodium chloride

NaOH:

Sodium hydroxide

NY:

Nyloset yellow E-RK

OG:

Orange G

PANI:

Polyaniline

RBBA:

Reactive black 5

RO16:

Reactive orange 16

RR141:

Reactive red 141

RRR:

Reactive red 198

RSM:

Response surface methodology

RTB:

Reactive black 21

RY81:

Reactive yellow 81

SDS:

Sodium dodecyl sulfate

SEM:

Scanning electron microscopy

SiO2 :

Silicon dioxide

TEM:

Transmission electron microscopy

TiO2 :

Titanium dioxide

UV:

Ultraviolet

VSM:

Vibrating sample magnetometer

XPS:

X-ray photoelectron spectroscopy

XRD:

X-ray diffraction

Zn:

Zinc

ZnO:

Zinc oxide

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Acknowledgements

The authors sincerely acknowledge the support provided by the Hindustan Institute of Technology and Science, India, Government College of Technology, India, and Aarupadai Veedu Institute of Technology, Vinayaka Mission's Research Foundation, India.

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Correspondence to Raja Sivashankar.

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The authors declare that they have no conflict of interest.

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Nithya, R., Thirunavukkarasu, A., Sathya, A.B. et al. Magnetic materials and magnetic separation of dyes from aqueous solutions: a review. Environ Chem Lett 19, 1275–1294 (2021). https://doi.org/10.1007/s10311-020-01149-9

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  • DOI: https://doi.org/10.1007/s10311-020-01149-9

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