Synthesis, Characterization, and Application of Ag-Doped Mercapto-Functionalized Clay for Decolorization of Coomassie Brilliant Blue: Optimization Using Rsm

Abstract

Herein, we report the use of silver nanoparticles (AgNPs) supported on mercapto-functionalized clay for the decolorization of Coomassie brilliant blue (CBB). The effect of four parameters (NaBH4 amount, CBB concen-tration, time, and catalyst amount) on the decolorization efficiency and the optimization of the process was investigated. Under optimum conditions (8.76 mM, 20.86 mg/L, 115.82 s and 0.23 mg/mL for NaBH4 amount, CBB concentration, time, and catalyst amount, respectively), the decolorization efficiency for CBB was 97.73%. The kinetic results indicated decolorization rate was increased toward the temperature (293 to 323 K). The thermodynamic parameters show that the process is endothermic and favorable.