Nanosized Metal Oxide-Based Adsorbents for Heavy Metal Removal: A Review - Advanced Materials for Agriculture, Food and Environmental Safety - page 245

Adsorbent Method Morphology Target metal Isotherm performance Ref.

Hematite
(α-Fe 2 O 4 )

Co-precipitation: FeSO 4 +NaOH
heated at 40°C for 2 days

Granular, crystal size 74 nm Cu(II) Langmuir 84.46 mg/g [19]

Geothite
(α-FeOOH)

Fe(NO3) precipitation Needlelike length 200 nm,

width < 50 nm

Cu(II) - 100% removal [20]

Hydrous
amphorphous
Fe oxide

Precipitation: Fe(NO 3 ) 2 +NaOH Particles; Diameter, 3.8 nm Pb(II) - 19.2 mg/g [21]

Sol-gel Particles; Diameter, 10.8 nm Cr(VI) Freundlich Cr(VI) [27]

Sol-gel Particles; Diameter, 10.8 nm Cr(VI), Cu(II),

Ni(II)

Langmuir 17.2mg/g Cr(VI)

26.8 mg/g Cu(II),
23.6 mg/g Ni(II)

[28]

MnO 2 Precipitation:Mn(NO 3 ) 2

+ NaMnO4 + NaOH

Particles; Diameter, 2.1 nm Pb(II), Surface dif usivi-

ties 1.7 × 10-16
cm2s-1

[34]

Precipitation: MnSO 4 + NaClO 4 Particles Pb(II), Cd(II) Freundlich - [35]

( Continued )