Open AccessCombination of biosorption and photodegradation to remove methyl orange from aqueous solutions
Author(s) -
Yu JunXia,
Chi RuAn,
He ZhengYan,
Qi YaFeng,
Zhan Guang,
Guo Jia
Publication year - 2011
Publication title -
engineering in life sciences
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.547
H-Index - 57
eISSN - 1618-2863
pISSN - 1618-0240
DOI - 10.1002/elsc.201000158
Subject(s) - biosorption , methyl orange , adsorption , chemistry , freundlich equation , desorption , sorption , langmuir , column chromatography , langmuir adsorption model , aqueous solution , photodegradation , nuclear chemistry , orange (colour) , chromatography , organic chemistry , catalysis , photocatalysis , food science
In this study, metal ion‐modified biomass of waste beer yeast was prepared to improve its adsorption capacity for an anionic dye: methyl orange. The adsorption capacities of Fe 3+ ‐, Mg 2+ ‐, Ca 2+ ,‐ and Na + ‐modified biomass preparations for methyl orange were 90.8, 51.3, 23.0, and 20.6 mg/g, which were 30, 17, 8, and 7 times that of the unmodified biomass, respectively. Adsorption isotherm experiments showed that the Freundlich model gave better fits than the Langmuir model for methyl orange adsorption on Fe 3+ ‐, Mg 2+ ‐, Ca 2+ ‐modified and unmodified biomass, whereas on Na + ‐modified biomass the Langmuir model gave better fits. The sorption and desorption kinetics of methyl orange on Fe 3+ ‐ and Mg 2+ ‐modified biomass both fitted well to the pseudo‐second‐order kinetic models, with R ≥0.998, and the desorption processes in NaOH solution (pH 12) were very fast in attaining equilibrium, i.e. within 15 min. In order to avoid secondary pollution, the eluent containing the desorbed methyl orange was treated with a photocatalyst: P25. After that, the eluent could be reused, and thus saving a large volume of eluent.