Research Article

Statistical Modeling and Kinetic Studies on the Adsorption of Reactive Red 2 by a Low-Cost Adsorbent: Grape Waste-Based Activated Carbon Using Sulfuric Acid Activator-Assisted Thermal Activation

Figure 7

Langmuir isotherm for RR2 adsorption on GWAC (a) type 1 Langmuir, (b) type 2 Langmuir, (c) type 3 Langmuir, and (d) type 4 Langmuir at (, , ).
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