Biosorption of Methyl Red, Thymol Blue and Their Dye Mixtures Using Modified Elephant Grass, Pennisetum Purpureum
Résumé
Abstract The presence of dye effluents in surface water has emerged as a significant environmental and public health concern. Biosorption technology employs natural plant materials and agricultural waste to eliminate color constituents from aqueous solutions. In this context, the potential of Pennisetum purpureum (elephant grass) was investigated for its ability to remove methyl red and thymol blue dyes. The adsorbent underwent characterization through Fourier Transform Infrared Spectroscopy (FT-IR), UV-Visible spectrophotometry, as well as Langmuir and Freundlich analyses. Batch adsorption experiments were conducted to explore the impact of pH (ranging from 4 to 9), initial dye concentration (ranging from 10 to 50 mg/L), contact time (spanning 30 to 180 minutes), and adsorbent dosage (ranging from 0.05 to 0.3 g) on the removal of cadmium ions. The FT-IR findings of this study revealed that both untreated and potassium persulfate-treated P. purpureum predominantly contained functional groups such as carbonyl, carboxyl, hydroxyl, and amine groups. These groups possess the ability to bind with positively charged cadmium ions. The optimal conditions for effective removal were observed at pH 4, an adsorbent dosage of 0.1 g, a contact time of 30 minutes, an initial concentration of 10 mg/L, and a temperature of 30°C. The results strongly support the notion that both biosorbents hold significant potential for the removal of methyl red and thymol blue dyes.Key Words: Methyl Red, Thymol Blue, Adsorbent, Biosorption, Biosorbent, Elephant Grass
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