Table 2 Adsorption equilibrium constants obtained from Langmuir, Freundlich and Temkin isotherms in the adsorption of Cd(II) onto the four rice straw adsorbents.

From: Characterization and Interpretation of Cd (II) Adsorption by Different Modified Rice Straws under Contrasting Conditions

Treatments

Temperature (K)

Langmuir

Freundlich

Temkin

qm (mg g−1)

KL (L mg−1)

R2

KF (mg(1-1/n) g−1 L1/n)

1/n

R2

B1

KT

R2

Sp

298

8.00334

0.00403

0.97041

0.24775

0.49038

0.95810

1.41157

0.07457

0.93204

308

8.76246

0.00467

0.96685

0.34308

0.46124

0.98589

1.51178

0.09591

0.94104

318

25.2405

0.00199

0.97643

0.20699

0.65831

0.95180

3.96250

0.04058

0.92862

Sa

298

56.73956

0.0833

0.72283

15.22602

0.21885

0.56832

9.00016

1.47786

0.72848

308

70.04386

0.04055

0.91422

11.74713

0.29859

0.74798

13.86945

0.40946

0.89936

318

72.80991

0.05567

0.77991

14.82427

0.26600

0.65398

12.89211

0.73158

0.78507

Sb

298

5.5494

1.18848

0.62414

3.88294

0.06518

0.98366

0.32618

106895.0

0.99777

308

12.08095

0.04896

0.76533

2.99239

0.22961

0.94509

1.76692

1.87956

0.95812

318

25.1658

0.00632

0.88818

1.71175

0.38917

0.94648

2.77699

0.88637

0.85144

Ms

298

8.14353

0.0142

0.94030

1.12171

0.29845

0.94945

1.42423

0.28727

0.96985

308

7.7523

0.03237

0.84066

1.76356

0.23455

0.96661

1.17731

1.10837

0.97634

318

19.32293

0.00446

0.97593

0.63067

0.48946

0.96220

3.27095

0.09383

0.92453

  1. Sp, rice straw powder; Sa, rice straw ash; Sb, rice straw biochar; Ms, modified rice straw.
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