Table 2 Summary of magnetite nanoparticles synthesis by co-precipitation method using mechanical stirrer

0.75g FeCl₂ 4H₂O & 1.75g Fe(NO₃)₃ 6H₂O

5.5 ml NH₄OH

Stirring by 500 rpm

13±1

[65]

1.625g FeCl₂ 4H₂O & 4.430g FeCl₃.6H₂O

10 ml NH₄OH

Stirring by 1000 rpm for 2h at 25 °C

[66]

10 & 20 mmol/L FeCl₃ FeCl₂

1 M NaOH

_

3 to 5

[67]

1:2 M FeCl₂.4H₂O & FeCl₃.6H₂O

NaOH

_

10.56

[68]

17.15g FeSO₄·7H₂O & 35.5 ml FeCl₃

20.7g NaOH

_

10–50

[69]

25mM FeCl₂& 50mM ferrous nitrate

NaOH, KOH, NH₄OH

Stirring for 1 h at 25°C

11.23±2.04

[70]

Stirring for 1 h at 50°C

9.01±1.30

Stirring for 1 h at 70°C

6.83±1.11

5.2g of FeCl₃& 4.448g FeSO₄·7H₂O

1.5 M NaOH

Stirring by 600 rpm at room temperature

86.01

[71]

6.5g of FeCl₃& 5.56g FeSO₄.7H₂O

1.5 M NaOH

Stirring by 600 rpm with heating at 80 ̊C

74.14

1.99g FeCl₂.4H₂0 & 5.41g FeCl₃.6H₂O

25% NH₃.H₂O

Stirring at 25^oC,40^oC,60^oC,80^oC for 60 min

10.14±0.2

10.32±0.9

10.95±0.8

11.66±0.87

[72]

FeCl₂.4H₂O & FeCl₃.6H₂O

35 ml NaOH

stirring by 200 rpm at 25 °C

10.03

[73]

FeCl₂.4H₂O & Fe₂(SO₄)₃

6.6

FeCl₂.4H₂O & Fe(NO₃)₃.9H₂O

8.86

FeSO₄.7H₂O & FeCl₃.6H₂O

8.7

FeSO₄.7H₂O & Fe₂(SO₄)₃

5.1

FeSO₄.7H₂O & Fe(NO₃)₃.9H₂O

8.23

8.64g FeCl₂ 4H₂O & 23.50g of FeCl₃ 6H₂O

34.4 ml NH₄OH

Stirring by 300 rpm & heating at 60^oC

20-78

[74]

0.01M FeCl₂∙4H₂O & 0.02M FeCl₃∙6H₂O

0.08-0.1 M NaOH

Stirring at 500 rpm

10.7-11.5

[75]

0.09 KOH

7.1

16.25g FeCl₃& 6.35 g of FeCl₂

2 M NaOH

Stirring at 30^oC

_

[76]

1.5 g of FeCl₂ 4H₂O & 3.0 g of FeCl₃

10 ml NH₄OH

Stirring at various temps. (0–90°C)

10–40

[77]

2:1M FeCl₂ 4H₂O & FeCl₃·6H₂O

3M NaOH

Stirring for 30 min

12.6-13.8

[78]

0.01 M FeCl₂.4H₂O & 0.02 M FeCl₃.6H₂O

1.5M NaOH

_

10 to 13

[79]

1M (NH₄)₂Fe(SO₄)₂& 2M FeCl₃

0.5M NaOH

Stirring & kept at 80^oC

20

[80]

1M FeCl₂·4H₂O and 2M FeCl₃·6H₂O

20 ml NH₄OH

Stirring by 300, 400, and 500 rpm

_

[56]