Optimization through isotherm for removal of Congo red dye from aqueous solution using natural adsorbents
M. Jadhav1,*, M. Kharade2
The residual dyes from various industries consist of wide varieties of dyes conveyed to natural water.
Adsorption is an effective process for the treatment of various dye contaminated effluents.
Various agricultural biomass-waste products are cost effective adsorbents in wastewater treatment.
pH plays the utmost important role in catalyzing the adsorption process.
Orange pill powder shows significant results for both Langmuir and Freundlich Isotherms.
The present study investigates the application of natural low cost adsorbents (e.g. orange peel, coconut shell and groundnut shell) for removal of Congo red dye from aqueous solution. The effect of various parameters such as pH, adsorbent dose, dye concentration, stirring rate and contact time on adsorption of Congo red dye was studied. The main aim of this study is to assess the suitability of locally available low cost agri-residue as an adsorbent using batch study mode. Batch study results showed that, with increase in an adsorbent dose, removal efficiency of Congo red dye increases due to increase in available surface sites for adsorption. The Congo red dye adsorption was also affected by pH and other process parameters. pH plays the utmost important role in catalyzing the adsorption process. Orange pill powder shows better result at pH 9, coconut shell powder at pH 7 and groundnut powder at pH 4, for removal of Congo red dye. From optimization study it is seen that orange pill powder shows significant results for both Langmuir and Freundlich Isotherms with R2 values of 0.735 and 0.732 respectively. Coconut shell powder is significant for Freundlich Isotherm (R2 = 0.7445) as well as for Langmuir isotherm (R2 = 0.718). Groundnut shell powder is insignificant for both Langmuir isotherm (R2 = 0.4944) as well as Freundlich Isotherms (R2 = 0.6517). Finally, it is concluded that the orange pills and coconut shell performed better than groundnut shell.
To cite this article: Jadhav M, Kharade M. Optimization through isotherm for removal of Congo red dye from aqueous solution using natural adsorbents. Journal of Desalination and Water Purification 2020;21:2-7.