title: Application of anaerobic granular sludge for competitive biosorption of methylene blue and Pb(II): Fluorescence and response surface methodology.
abstract: This study assessed the biosorption of anaerobic granular sludge (AGS) and its capacity as a biosorbent to remove Pb(II) and methylene blue (MB) from multi-components aqueous solution. It emerged that the biosorption data fitted well to the pseudo-second-order and Langmuir adsorption isotherm models in both single and binary systems. In competitive biosorption systems, Pb(II) and MB will suppress each other's biosorption capacity. Spectroscopic analysis, including Fourier transform infrared spectroscopy (FTIR) and fluorescence spectroscopy were integrated to explain this interaction. Hydroxyl and amine groups in AGS were the key functional groups for sorption. Three-dimensional excitation-emission matrix (3D-EEM) implied that two main protein-like substances were identified and quenched when Pb(II) or MB were present. Response surface methodology (RSM) confirmed that the removal efficiency of Pb(II) and MB reached its peak when the concentration ratios of Pb(II) and MB achieved a constant value of 1.
authors.affiliation: Key Laboratory of Chemical Sensing and Analysis in Universities of Shandong, School of Chemistry and Chemical Engineering, University of Jinan, Jinan 250022, PR China.
authors.forename: Li
authors.initials: L
authors.lastname: Shi
authors.affiliation: School of Resources and Environment, University of Jinan, Jinan 250022, PR China.
authors.forename: Dong
authors.initials: D
authors.lastname: Wei
authors.affiliation: School of Civil and Environmental Engineering, University of Technology Sydney, Broadway, NSW 2007, Australia.
authors.forename: Huu Hao
authors.initials: HH
authors.lastname: Ngo
authors.affiliation: School of Civil and Environmental Engineering, University of Technology Sydney, Broadway, NSW 2007, Australia.
authors.forename: Wenshan
authors.initials: W
authors.lastname: Guo
authors.affiliation: School of Resources and Environment, University of Jinan, Jinan 250022, PR China.
authors.forename: Bin
authors.initials: B
authors.lastname: Du
authors.affiliation: Key Laboratory of Chemical Sensing and Analysis in Universities of Shandong, School of Chemistry and Chemical Engineering, University of Jinan, Jinan 250022, PR China. Electronic address: sdjndxwq@163.com.
authors.forename: Qin
authors.initials: Q
authors.lastname: Wei
mesh_terms: D000327:Adsorption; D000693:Anaerobiosis; D007700:Kinetics; D007854:Lead / Q000302:isolation & purification*; D008751:Methylene Blue / Q000302:isolation & purification*; D008962:Models, Theoretical; D012722:Sewage / Q000737:chemistry*; D013050:Spectrometry, Fluorescence; D017550:Spectroscopy, Fourier Transform Infrared; D013696:Temperature; D013997:Time Factors
chemical_list: D012722:Sewage; D007854:Lead; D008751:Methylene Blue
keywords: Anaerobic granular sludge; Competitive biosorption; Fluorescence spectroscopy; Response surface methodology