Title :
Adsorption behaviors and characteristics of methylene blue on fly ash in aqueous solutions
Author_Institution :
Sch. of Resource & Environ., Shaanxi Univ. of Sci. & Technol., Xi´an, China
Abstract :
Fly ash (FA) was used as adsorbent to remove methylene blue (MB) in aqueous solutions, adsorption kinetics and isotherm equations were analyzed to reveal the characteristics, optimal operation conditions were attained through orthogonal experiments. The results revealed that FA was acceptable on MB removal. The process was a pseudo-second-order reaction and fit Langmuir isotherm equation better with correlation coefficients of R2 0.9989 and the maximum adsorption capacity 11.0865 mg/g, the reaction could proceed spontaneously and the reaction was endothermic. Orthogonal experiments indicated that of MB concentration 20 mg/L, dosage of FA 0.5 g and initial pH value 5 was optimal, the average removal efficiency was 98.77%. FA was appropriate to remove MB and Cr(III) together in aqueous solutions. With acceptable removal efficiency and lower cost, the reaction system with FA was potential in future utilization for wastewater purification.
Keywords :
adsorption; fly ash; Langmuir isotherm equation; adsorption behavior; adsorption kinetics; aqueous solutions; correlation coefficients; fly ash; isotherm equations; maximum adsorption capacity; methylene blue; pseudo-second-order reaction; wastewater purification; Equations; Fly ash; Hazards; Ions; Kinetic theory; Purification; Wastewater; adsorption isotherms; fly ash; methylene blue; orthogonal experiment;
Conference_Titel :
Water Resource and Environmental Protection (ISWREP), 2011 International Symposium on
Conference_Location :
Xi´an
Print_ISBN :
978-1-61284-339-1
DOI :
10.1109/ISWREP.2011.5893704