Uptake of dyes by a promising locally available agricultural solid waste: coir pith.
The adsorption of rhodamine-B and acid violet by coir pith carbon was carried out by varying the parameters such as agitation time, dye concentration, adsorbent dose and pH. The adsorption followed both Langmuir and Freundlich isotherms. The adsorption capacity was found to be 2.56 mg and 8.06 mg dye per g of the adsorbent for rhodamine-B and acid violet, respectively. Adsorption of dyes followed first order rate kinetics. Acidic pH was favorable for the adsorption of acid violet and alkaline pH was favorable to rhodamine-B. Desorption studies showed that alkaline pH was favorable for the desorption of acid violet and acidic pH was favorable for the desorption of rhodamine-B.
Namasivayam
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Environmental Chemistry Laboratory, Department of Environmental Sciences, Bharathiar University, Tamil Nadu, India. namasi@bharathi.ernet.in
Radhika
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Suba
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D000327:Adsorption; D000383:Agriculture; D002244:Carbon / Q000737:chemistry*; D003059:Cocos / Q000737:chemistry*; D005456:Fluorescent Dyes / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D007220:Industrial Waste / Q000032:analysis; D008962:Models, Theoretical; D012235:Rhodamines / Q000737:chemistry; D012394:Rosaniline Dyes / Q000737:chemistry; D018505:Waste Management / Q000379:methods*; D014874:Water Pollutants, Chemical
D005456:Fluorescent Dyes; D007220:Industrial Waste; D012235:Rhodamines; D012394:Rosaniline Dyes; D014874:Water Pollutants, Chemical; D002244:Carbon; C029773:rhodamine B