Abstract
Solanum tuberosum (STP) and Pisum sativum peels (PSP) were used for removal of toxic Congo Red dye using indigenous sources. Potato (Solanum tuberosum) and pea (Pisum sativum) are commonly and abundantly cultivated plants in Asian countries and their peels are easily available. The optimized conditions for Solanum tuberosum peels (STP) and Pisum sativum peels (PSP) were: adsorbent dose; 0.8 and 0.6 g, contact time; 50 and 35 min, pH; 3 and 2, agitation speed; 200 and 125 rpm and temperature; 30 oC for both STP and PSP respectively. Isothermal studies indicated that Langmuir model followed by equilibrium data more than Freundlich model. Negative value of thermodynamic parameter ∆Go shown that Cong Red removal by both adsorbents was spontaneous and exothermic in nature. The adsorption capacity (qmax) for Solanum tuberosum and Pisum sativum peels were found to be 6.9 and 16.4 mg.g-1, respectively. Higher value of qmax for pea peels shown that it is more suitable adsorbent for removal of Congo Red dye than potato peels. KEY WORDS: Congo red, Solanum tuberosum, Pisum sativum, Biosorption Bull. Chem. Soc. Ethiop. 2018, 32(2), 213-223.DOI: https://dx.doi.org/10.4314/bcse.v32i2.3
Highlights
Water is being polluted largely due to increased industrialization
The aim of this study was to check the usability of Solanum tuberosum peels and Pisum sativum peels as adsorbents for adsorption of Congo Red dye
FT-IR spectra study of Solanum tuberosum peels before adsorption showed band at 3341.74 cm-1 which indicated the presence of O-H group while peak observed at 2923.77 cm-1 showed the stretching of C-H bond
Summary
Paper and pulp, paint, printing and cosmetic industries use dyes. 50% of dye is lost during dyeing processes. Discharge of waste water from such industries contains toxic organic solids. The release of these dyes containing waste water into rivers, seas has adverse effects on the people who use such contaminated water for living purposes like washing, bathing and drinking. Even a small quantity of dye (1.0 mg/L) in water is detectable and objectionable. Besides this dyes can influence aquatic plants by reducing transmission of sunlight into water. It is very difficult to treat waste water containing dyes because dye hinders light to penetrate into water, prevents photosynthesis and shows stability towards light and heat [3, 4]
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