Table 1 Kinetics and isotherms parameters for As (III) and Cd(II) adsorption on Fh@BC (25 °C) in the single solution or binary solution (with a simultaneous or sequential addition).

From: Simultaneous adsorption of As(III) and Cd(II) by ferrihydrite-modified biochar in aqueous solution and their mutual effects

Parameters

Treatment

Cd

As

Cd + As

Cd and As

As + Cd

Cd

Cd + As

Cd and As

As + Cd

As

PFO

qe (mg g−1)

3.147

2.309

2.022

2.865

1.080

1.442

1.578

1.356

k1 (h−1)

0.642

0.909

0.903

0.891

1.055

0.882

0.615

1.165

R2

0.918

0.954

0.963

0.973

0.910

0.892

0.833

0.923

PSO

qe (mg g−1)

3.322

2.426

2.197

3.112

1.190

1.532

1.684

1.481

k2(g (mg h)−1)

0.325

0.698

0.679

0.463

1.294

0.954

0.566

1.200

R2

0.967

0.989

0.985

0.994

0.965

0.960

0.923

0.968

Langmuir

KL (L mg−1)

0.021

0.068

0.007

0.026

0.034

0.041

0.017

0.016

Qm (mg g−1)

23.712

14.751

19.958

18.181

6.838

13.550

22.809

18.381

R2

0.966

0.890

0.973

0.990

0.913

0.924

0.978

0.970

Freundlich

KF(mg(1−n) Ln g−1)

1.763

2.941

0.406

1.420

0.721

1.609

1.033

0.751

n

2.127

3.178

1.567

2.181

2.412

2.483

1.807

1.804

R2

0.999

0.994

0.982

0.988

0.808

0.896

0.934

0.919

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