Parameter

Metal ion

Optimum Quantity Adsorbed at Equilibrium (mg/g)

Iron oxide

Goethite

Contact Time

Co(II)

95.1

100

Ni(II)

81.4

80.2

Adsorbent Dose

Co(II)

96.2

105.6

Ni(II)

82.2

93.2

pH

Co(II)

103.9

117.8

Ni(II)

85.2

100.6