Abstract
BackgroundCeriporia lacerata, a strain of white-rot fungus isolated from the litter of an invasive plant (Solidago canadensis) in China, was little known about its properties and utilization. In this work, the copper(II) biosorption characteristics of formaldehyde inactivated C. lacerata biomass were examined as a function of initial pH, initial copper(II) concentration and contact time, and the adsorptive equilibrium and kinetics were simulated, too.ResultsThe optimum pH was found to be 6.0 at experimental conditions of initial copper(II) concentration 100 mg/L, biomass dose 2 g/L, contact time 12 h, shaking rate 150 r/min and temperature 25°C. Biosorption equilibrium cost about 1 hour at experimental conditions of pH 6.0, initial copper(II) concentration 100 mg/L, C. lacerata dose 2 g/L, shaking rate 150 r/min and temperature 25°C. At optimum pH 6.0, highest copper(II) biosorption amounts were 6.79 and 7.76 mg/g for initial copper(II) concentration of 100 and 200 mg/L, respectively (with other experimental parameters of C. lacerata dose 2 g/L, shaking rate 150 r/min and temperature 25°C). The pseudo second-order adsorptive model gave the best adjustment for copper(II) biosorption kinetics. The equilibrium data fitted very well to both Langmuir and Freundlich adsorptive isotherm models.ConclusionsWithout further acid or alkali treatment for improving adsorption properties, formaldehyde inactivated C. lacerata biomass possesses good biosorption characteristics on copper(II) removal from aqueous solutions.
Highlights
Ceriporia lacerata, a strain of white-rot fungus isolated from the litter of an invasive plant (Solidago canadensis) in China, was little known about its properties and utilization
The objectives of this work were to verify the capacity of dead C. lacerata in copper(II) removal under batch conditions, to determine the influences of parameters involved, and to simulate the adsorptive equilibrium and kinetics
At low pH, H+ ions competed with Cu2+ ions for the biosorption sites, that is protonation of the cell wall components negatively affected the biosorption capacity of dead C. lacerata biomass
Summary
A strain of white-rot fungus isolated from the litter of an invasive plant (Solidago canadensis) in China, was little known about its properties and utilization. The heavy metal ion biosorption by fungal biomass is based mainly on two mechanisms: covalent bonding with functional groups including carboxyl, hydroxyl, phosphate, amino, sulphydryl, and the result of physicochemical inorganic interactions directed by adsorption phenomena [2,5,6,7]. White-rot fungi were relatively less reported for their biosorption though they were strong degrader of various xenobiotics and detoxicating materials of contaminated effluents [20,21]. They possess the capacity of heavy metal biosorption [21]
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