Activated carbon from industrial solid waste as an adsorbent for the removal of Rhodamine-B from aqueous solution: kinetic and equilibrium studies.
The activated carbon was prepared using industrial solid waste called sago waste and physico-chemical properties of carbon were carried out to explore adsorption process. The effectiveness of carbon prepared from sago waste in adsorbing Rhodamine-B from aqueous solution has been studied as a function of agitation time, adsorbent dosage, initial dye concentration, pH and desorption. Adsorption equilibrium studies were carried out in order to optimize the experimental conditions. The adsorption of Rhodamine-B onto carbon followed second order kinetic model. Adsorption data were modeled using both Langmuir and Freundlich classical adsorption isotherms. The adsorption capacity Q0 was 16.12 mg g(-1) at initial pH 5.7 for the particle size 125-250 microm. The equilibrium time was found to be 150 min for 10, 20 mg l(-1) and 210 min for 30, 40 mg l(-1) dye concentrations, respectively. A maximum removal of 91% was obtained at natural pH 5.7 for an adsorbent dose of 100mg/50 ml of 10 mg l(-1) dye concentration and 100% removal was obtained when the pH was increased to 7 for an adsorbent dose of 275 mg/50 ml of 20 mg l(-1) dye concentration. Desorption studies were carried out in water medium by varying the pH from 2 to 10. Desorption studies were performed with dilute HCl and show that ion exchange is predominant dye adsorption mechanism. This adsorbent was found to be both effective and economically viable.
Kadirvelu
K
K
Department of Environmental Science, P.S.G. College of Arts and Science, Coimbatore-641014, Tamil Nadu, India. kadirvelu@lycos.com
Karthika
C
C
Vennilamani
N
N
Pattabhi
S
S
D000327:Adsorption; D002244:Carbon / Q000737:chemistry*; D005456:Fluorescent Dyes / Q000302:isolation & purification*; D006863:Hydrogen-Ion Concentration; D007220:Industrial Waste; D007700:Kinetics; D010316:Particle Size; D012235:Rhodamines / Q000302:isolation & purification*; D018508:Water Purification / Q000191:economics / Q000379:methods*
D005456:Fluorescent Dyes; D007220:Industrial Waste; D012235:Rhodamines; D002244:Carbon; C029773:rhodamine B