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J Environ Manage. 2017 Oct 1;201:316-326. doi: 10.1016/j.jenvman.2017.06.050. Epub 2017 Jul 5.

Study of decolorisation of binary dye mixture by response surface methodology.

Author information

1
Symbiosis International University (SIU), Lavale, Mulshi Taluka, Pune, Maharashtra 412115, India. Electronic address: shraddhagarg2285@gmail.com.
2
Symbiosis Institute of Technology, A Constituent of Symbiosis International University (SIU), Lavale, Mulshi Taluka, Pune, Maharashtra 412115, India. Electronic address: dipikaj@sitpune.edu.in.

Abstract

Decolorisation of a complex mixture of two different classes of textile dyes Direct Red 81 (DR81) and Rhodamine B (RHB), simulating one of the most important condition in real textile effluent was investigated onto deoiled Argemone Mexicana seeds (A. Mexicana). The adsorption behaviour of DR81 and RHB dyes was simultaneously analyzed in the mixture using derivative spectrophotometric method. Central composite design (CCD) was employed for designing the experiments for this complex binary mixture where significance of important parameters and possible interactions were analyzed by response surface methodology (RSM). Maximum adsorption of DR81 and RHB by A. Mexicana was obtained at 53 °C after 63.33 min with 0.1 g of adsorbent and 8 × 10-6 M DR81, 12 × 10-6 M RHB with composite desirability of 0.99. The predicted values for percentage removal of dyes from the mixture were in good agreement with the experimental values with R2 > 96% for both the dyes. CCD superimposed RSM confirmed that presence of different dyes in a solution created a competition for the adsorbent sites and hence interaction of dyes was one of the most important factor to be studied to simulate the real effluent. The adsorbent showed remarkable adsorption capacities for both the dyes in the mixture.

KEYWORDS:

Adsorption; Argemone Mexicana; Central composite design (CCD); Mixture of dyes; Natural adsorbent; Response surface methodology (RSM)

PMID:
28688319
DOI:
10.1016/j.jenvman.2017.06.050
[Indexed for MEDLINE]

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