Biosorbent from Tomato Stems: Adsorption Properties Using Methylene Blue as Pollutant Test
N’guadi Blaise Allou *
Laboratoire de Constitution et Réaction de la Matière, UFR SSMT, Université Félix Houphouët Boigny, Abidjan, Côte d’Ivoire.
M’Bouillé Cissé
Laboratoire des Sciences et Technologies de l’Environnement, UFR Environnement, Université Jean Lorougnon Guédé, Daloa, Côte d’Ivoire.
Gaoussou Bamba
Laboratoire de Constitution et Réaction de la Matière, UFR SSMT, Université Félix Houphouët Boigny, Abidjan, Côte d’Ivoire.
Alimata Konaté
Laboratoire de Constitution et Réaction de la Matière, UFR SSMT, Université Félix Houphouët Boigny, Abidjan, Côte d’Ivoire.
Bi Irié Marc Gouli
Laboratoire de Constitution et Réaction de la Matière, UFR SSMT, Université Félix Houphouët Boigny, Abidjan, Côte d’Ivoire.
*Author to whom correspondence should be addressed.
Abstract
Dye removal from wastewater using activated carbons was the subject of much scientific research in recent decades. However, high–quality and inexpensive adsorbents production using biomass has attracted more attention from researchers. In this study, tomato stem–based bio–adsorbent was prepared for methylene blue (MB) removal from aqueous medium using batch mode adsorption. Activated carbon performance for MB adsorption was evaluated by studying several parameters effect such as contact time, solution initial pH, dye solution initial concentration, temperature and adsorbent dose. High adsorption percentage of more than 80% of dye was observed with initial pH of 11, contact time of 120 min, adsorbent dose of 3 g L–1 and temperature of 60°C. Adsorption isotherm and kinetic models results predict that Langmuir isotherm as well as pseudo–second–order kinetic would better describe adsorption process. The maximum monolayer adsorption capacity obtained according to Langmuir model was 4.15 mg g−1.
Keywords: Tomato stem, biosorbent, activated carbon, methylene blue, adsorption, modeling