The adsorption behavior and mechanism investigation of Pb(II) removal by flocculation using microbial flocculant GA1.
In this work, microbial flocculant GA1 (MBFGA1) was used to remove Pb(II) ions from aqueous solution. A series of experimental parameters including initial pH, MBFGA1 dose, temperature and initial calcium ions concentration on Pb(II) uptake was evaluated. Meanwhile, the flocculation mechanism of MBFGA1 was investigated. The removal efficiency of Pb(II) reached up to 99.85% when MBFGA1 was added in two stages, separately. The results indicated that Pb(II) adsorption could be described by the Langmuir adsorption model, and being the monolayer capacity negatively affected with an increase in temperature. The adsorption process could be described by pseudo-second-order kinetic model. Fourier transform-infrared spectra and environmental scanning electron microscope analysis indicated that MBFGA1 had a large number of functional groups, which had strong capacity for removing Pb(II). The main mechanisms of Pb(II) removal by MBFGA1 could be charge neutralization and adsorption bridging.
College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China; Key Laboratory of Environmental Biology and Pollution Control, Hunan University, Ministry of Education, Changsha 410082, PR China.
Jing
J
Feng
Zhaohui
Z
Yang
Guangming
G
Zeng
Jing
J
Huang
Haiyin
H
Xu
Yuanyuan
Y
Zhang
Shumei
S
Wei
Like
L
Wang
D000327:Adsorption / Q000187:drug effects; D001419:Bacteria / Q000737:chemistry*; D002122:Calcium Chloride / Q000494:pharmacology; D005427:Flocculation; D006863:Hydrogen-Ion Concentration / Q000187:drug effects; D007700:Kinetics; D007854:Lead / Q000302:isolation & purification*; D008855:Microscopy, Electron, Scanning; D011135:Polysaccharides, Bacterial / Q000737:chemistry*; D017550:Spectroscopy, Fourier Transform Infrared; D055672:Static Electricity; D013696:Temperature; D014874:Water Pollutants, Chemical / Q000302:isolation & purification*
D011135:Polysaccharides, Bacterial; D014874:Water Pollutants, Chemical; D007854:Lead; D002122:Calcium Chloride
Adsorption; Mechanism investigation; Microbial flocculants; Pb(II)