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Research articles

ScienceAsia 37 (2011): 38-42 |doi: 10.2306/scienceasia1513-1874.2011.37.038

Removal of Janus Green dye from aqueous solution by phosphoric acid carbonized agro-industrial waste

Gautam K. Nagdaa,*, Vikram S. Gholeb

ABSTRACT:     Meaningful waste use aimed at conservation of resources and lowering the amount of pollution is now inevitable. In the present study, the potential of tendu (Diospyros melanoxylon) leaf waste from a local beedi (cigarette) industry to remove dye from aqueous solution was studied after its pretreatment with phosphoric acid. The carbon prepared was characterized by analysis of porosity, surface area, scanning electron micrograph, cation exchange capacity, iodine, and methylene blue number. Feasibility of employing this carbon for the removal of Janus Green, a diazine dye, from aqueous solution was investigated. Dye removal was compared simultaneously with commercial carbon. The adsorption was evaluated in a batch process with different concentrations of dye as well as with different adsorbent doses, at a range of pH values, temperature, and contact time. The kinetic parameters were determined and found to follow the Lagergren pseudo first order model. The suitability of the adsorbent was tested by fitting the adsorption data with Langmuir and Freundlich isotherms. The Langmuir maximum adsorption capacity was found to be 51 mg/g, which approached the value 57 mg/g obtained for commercial carbon. The changes in standard free energy, standard entropy and standard enthalpy were calculated. The results showed that adsorption of dye onto phosphoric acid treated tendu biomass was spontaneous and found to be physical and exothermic in nature.

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a Department of Environmental Sciences, University of Pune, Pune, India
b Department of Environmental Sciences, Vasantdada Sugar Institute, Pune, India

* Corresponding author, E-mail: gnagda@gmail.com

Received 26 Aug 2010, Accepted 1 Feb 2011