Equilibrium and Kinetic Studies on the Adsorption of Acid Yellow 36 Dye by Pinecone

Background & Aims of the Study: Dyes have significant role in environmental problems,due to their toxic effects on the food chain and sources of water. The purpose of thisresearch was to study the adsorption of acid yellow 36 dye onto pinecone using batchsystem.Materials & Methods: This research was performed at laboratory scale and batch system.Equilibrium isotherms were modeled using Langmuir, Freundlich, and D-R models. Alsokinetic studies were done by three models of pseudo first order, pseudo second order, andintra-particle diffusion.Results: The maximum adsorption was achieved at pH 5.0, adsorbent dose 0.7 g/l andcontact time 20 min. The equilibrium adsorption capacity (mg/g) increased with increasinginitial dye concentration. The Langmuir model (R2=0.99) provided the best fit for theexperimental data. The adsorption kinetics were studied and best fit was achieved bypseudo- second order model (R2= 0.96).Conclusions: According to the results obtained of equilibrium and kinetic studies on theadsorption of acid yellow 36, pinecone can be a suitable and efficient adsorbent in theremoval of yellow acid 36 dye from industrial wastewater.