TITLE:
Adsorption of Methylene Blue by NaOH-modified Dead Leaves of Plane Trees
AUTHORS:
Lei Gong, Wei Sun, Lingying Kong
KEYWORDS:
Modified; Bioadsorbent; Methylene Blue; Kinetics; Adsorption Isotherm
JOURNAL NAME:
Computational Water, Energy, and Environmental Engineering,
Vol.2 No.2B,
June
11,
2013
ABSTRACT: NaOH-modified dead leaves of plane trees were used as
bioadsorbent to remove methylene blue (MB) from aqueous solution. Variable
influencing factors, including contact time, temperature, initial MB
concentration and pH were studied through single-factor experiments. The
results showed that the initial concentration 100 mg/L, bioadsorbent
of 2.5 g/L, pH of 7, room temperature were the best adsorption conditions.
The NaOH-modified bioadsorbent had a high adsorption capacity for MB, and its
saturated extent of adsorption was 203.28 mg/g, which was higher than the
un-modified dead leaves (145.62 mg/g) and some other bioadsorbents. Finally,
adsorption kinetics and isotherms were discussed, suggesting that the Langmuir
isotherm model and Pseudo-second order kinetics were fitted well with the
adsorption process.