A novel biosorbent for dye removal: extracellular polymeric substance (EPS) of Proteus mirabilis TJ-1.
This paper deals with the extracellular polymeric substance (EPS) of Proteus mirabilis TJ-1 used as a novel biosorbent to remove dye from aqueous solution in batch systems. As a widely used and hazardous dye, basic blue 54 (BB54) was chosen as the model dye to examine the adsorption performance of the EPS. The effects of pH, initial dye concentration, contact time and temperature on the sorption of BB54 to the EPS were examined. At various initial dye concentrations (50-400 mg/L), the batch sorption equilibrium can be obtained in only 5 min. Kinetic studies suggested that the sorption followed the internal transport mechanism. According to the Langmuir model, the maximum BB54 uptake of 2.005 g/g was obtained. Chemical analysis of the EPS indicated the presence of protein (30.9%, w/w) and acid polysaccharide (63.1%, w/w). Scanning electron microscopy (SEM) images showed that the EPS with a crystal-linear structure was whole enwrapped by adsorbed dye molecules. FTIR spectrum result revealed the presence of adsorbing groups such as carboxyl, hydroxyl and amino groups in the EPS. High-molecular weight of the EPS with more binding-sites and stronger van der Waals forces together with its specific construct leads to the excellent performance of dye adsorption. The EPS shows potential board application as a biosorbent for both environmental protection and dye recovery.
Zhang
Zhiqiang
Z
State Key Laboratory of Pollution Control and Resource Reuse, Key Laboratory of Yangtze River Water Environment of Ministry of Education, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China.
Xia
Siqing
S
Wang
Xuejiang
X
Yang
Aming
A
Xu
Bin
B
Chen
Ling
L
Zhu
Zhiliang
Z
Zhao
Jianfu
J
Jaffrezic-Renault
Nicole
N
Leonard
Didier
D
D000327:Adsorption; D001391:Azo Compounds / Q000737:chemistry* / Q000302:isolation & purification*; D004396:Coloring Agents / Q000737:chemistry* / Q000302:isolation & purification*; D005110:Extracellular Space / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D008855:Microscopy, Electron, Scanning; D015394:Molecular Structure; D011513:Proteus mirabilis / Q000737:chemistry*; D017550:Spectroscopy, Fourier Transform Infrared; D013844:Thiazoles / Q000737:chemistry* / Q000302:isolation & purification*; D013997:Time Factors
D001391:Azo Compounds; D004396:Coloring Agents; D013844:Thiazoles; C075348:C.I. basic blue 54