title: Biosorption behavior and mechanism of heavy metals by the fruiting body of jelly fungus (Auricularia polytricha) from aqueous solutions.
abstract: The aim of this study was to investigate the biosorption characteristics of Cd(2+), Cu(2+), and Pb(2+) by the fruiting body of jelly fungus Auricularia polytricha. Batch experiments were conducted to characterize the kinetics, equilibrium, and mechanisms of the biosorption process. Optimum values of pH 5, biomass dosage 4 g L(-1), and contact time 60 min provided maximum biosorption capacities of A. polytricha for Cd(2+), Cu(2+), and Pb(2+) of 63.3, 73.7, and 221 mg g(-1), respectively. The maximum desorption was achieved using 0.05 mol L(-1) HNO(3) as an elute. The fruiting body was reusable at least for six cycles of operations. The pseudo-second-order model was the best to describe the biosorption processes among the three kinetic models tested. Freundlich and Dubinin-Radushkevich models fitted the equilibrium data well, indicating a heterogeneous biosorbent surface and the favorable chemisorption nature of the biosorption process. A Fourier transform infrared spectroscopy analysis indicated that carboxyl, amine/hydroxyl, amino, phosphoryl, and C-N-C were the main functional groups to affect the biosorption process. Synergistic ion exchange and surface complexation were the dominant mechanisms in the biosorption process. The present work revealed the potential of jelly fungus (fruiting body of A. polytricha) to remove toxic heavy metals from contaminated water.
authors.affiliation: School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou, 510275, People's Republic of China.
authors.forename: Haiwei
authors.initials: H
authors.lastname: Huang
authors.forename: Lixiang
authors.initials: L
authors.lastname: Cao
authors.forename: Yuxuan
authors.initials: Y
authors.lastname: Wan
authors.forename: Renduo
authors.initials: R
authors.lastname: Zhang
authors.forename: Wenfeng
authors.initials: W
authors.lastname: Wang
mesh_terms: D001487:Basidiomycota / Q000378:metabolism*; D018533:Biomass; D019149:Bioreactors / Q000382:microbiology; D002104:Cadmium / Q000378:metabolism*; D002413:Cations, Divalent / Q000378:metabolism*; D003300:Copper / Q000378:metabolism*; D006863:Hydrogen-Ion Concentration; D007854:Lead / Q000378:metabolism*; D008962:Models, Theoretical; D012996:Solutions; D014867:Water / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000378:metabolism*
chemical_list: D002413:Cations, Divalent; D012996:Solutions; D014874:Water Pollutants, Chemical; D002104:Cadmium; D014867:Water; D007854:Lead; D003300:Copper