title: Characteristics of cationic Red X-GRL biosorption by anaerobic activated sludge.
abstract: Anaerobic activated sludge (AAS) was employed for the adsorption of cationic Red X-GRL (X-GRL) from aqueous solutions. The X-GRL uptakes decreased with increases in temperature and salinity, while it was improved with increase in pH. The adsorption of X-GRL by AAS had a better agreement with a fractal-like Langmuir isotherm than a typical Langmuir isotherm. The adsorption rate coefficients at different time had a power-law relationship with time. The surface dimension was positively related to the X-GRL uptakes. The X-GRL uptake by the EPS accounted for only ≈ 19% of the total adsorption. The X-GRL adsorption was therefore largely attributed to the active groups on the cell wall. FTIR analysis showed that -CH(2) and -NH(2) groups were not responsible for the adsorption, which indicated chemical adsorption was negligible.
authors.affiliation: Beijing Key Lab for Source Control Technology of Water Pollution, Beijing Forestry University, Beijing 100083, China.
authors.forename: Bin
authors.initials: B
authors.lastname: Qiu
authors.forename: Xiang
authors.initials: X
authors.lastname: Cheng
authors.forename: Dezhi
authors.initials: D
authors.lastname: Sun
mesh_terms: D000327:Adsorption; D000693:Anaerobiosis; D004396:Coloring Agents / Q000378:metabolism*; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D012722:Sewage; D017550:Spectroscopy, Fourier Transform Infrared; D013696:Temperature; D013816:Thermodynamics
chemical_list: D004396:Coloring Agents; D012722:Sewage